Karnes County, TX: No Building Permit, No Zoning

Q: Does Karnes County have zoning?

Karnes County has no county zoning in unincorporated areas. Municipal zoning is different: Karnes City expressly has no zoning ordinance regulating residential or commercial land use within its city limits, while Kenedy requires uses and structures to conform to its zoning districts. The countywide municipal picture is incomplete, so ask the relevant city about zoning approval before relying on the unincorporated-area rule. Wherever the parcel lies, Karnes County remains the OSSF septic-permit authority. In county-governed subdivisions, standard spacing requires 1 acre for public water with conventional septic or a private well with public sewer, and 2 acres for a private well with conventional septic; dense spacing can allow smaller lots. County subdivision requirements are separate from zoning: the rules specify setbacks of 25 feet from the county right-of-way and 15 feet at the sides and rear.

Unincorporated Karnes County, Texas does not list a general residential building permit; ask the Permitting Department whether construction notices or inspections apply to your project¹²³. County zoning does not govern unincorporated land; Karnes City has no zoning ordinance, while Kenedy administers municipal zoning⁴⁵⁶. Karnes County handles OSSF septic permits countywide, including inside cities⁷.

At a glance

Building permit: No general residential permit is listed for unincorporated Karnes County; confirm any project-specific requirement with the Permitting Department¹
Zoning: No county zoning in unincorporated areas; municipal zoning varies, with none in Karnes City and zoning controls in Kenedy⁴⁸⁹¹⁰⁵
Septic (OSSF) permits: Karnes County Permitting Department, an OSSF Authorized Agent under TCEQ; a Determination Development Permit Application comes first¹¹⁷
RV / tiny home / manufactured home living: No county zoning rule sets occupancy limits in unincorporated areas; septic, subdivision and private restrictions can still matter⁸¹²
Minimum lot size: Subdivision lots outside city limits: 0.5 to 2 acres where conventional septic or a private well is used, depending on service and spacing¹³
Driveway access: A Driveway Permit from the county is required before connecting to a publicly dedicated road in a subdivision; county roads generally go through Road & Bridge permits¹⁴
Well permits: Evergreen Underground Water Conservation District reviews new wells before drilling; production-permit exemptions depend on output and use, and exempt wells must register¹⁵
Owner-builder: No county-specific permit or inspection exemption was confirmed; state law only provides a conditional exception from an inspection-notice penalty¹⁶

Who to call

Septic permits

Karnes County Permitting Department - Special Projects/Septic Permits

OSSF (septic) permit applications, including the required Determination Development Permit Application, for Karnes County

830-780-3511

lupe.snyder@co.karnes.tx.us

210 W Calvert Ave. Suite 155, Karnes City, TX 78118

Online permits →

Roads & driveways

Karnes County Permitting Department - Road & Bridge Permits

Road & Bridge permits for work affecting county roads and rights-of-way in Karnes County

830-780-3511

lupe.snyder@co.karnes.tx.us

210 W Calvert Ave. Suite 155, Karnes City, TX 78118

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

Going off-grid in Karnes County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Karnes County, Texas?

Karnes County's Permitting Department lists development-determination, OSSF septic, floodplain and road-and-bridge work, but it does not list a general residential building permit for unincorporated land¹. Texas residential standards under Chapter 233, Subchapter F apply only when an eligible county adopts the required resolution or order, and that law does not require county approval before construction begins². We could not confirm that Karnes County adopted the required order, so ask the Permitting Department whether project-specific standards, notices or inspections apply before construction²³. If Subchapter F applies, a new house on a vacant lot needs inspections at the foundation, framing-and-systems and completion stages, arranged by the builder with a qualified inspector³. A platted subdivision can separately trigger county rules for minimum lot size, mapped flood hazards and driveway access¹³¹⁷¹⁴. An owner-builder should not treat state law as a blanket exemption from underlying requirements¹⁶.

Who handles building-permit questions, septic permits and road permits in Karnes County?

Karnes County does not identify a general residential building-permit office for unincorporated land, so ask the county Permitting Department whether a building permit, construction notice or inspection applies to the project¹²³. The county Permitting Department also handles Road & Bridge permits¹⁸. Reach the department at 830-780-3511 or visit 210 W Calvert Ave. Suite 155, Karnes City, TX 78118¹⁹. Office hours are 8:00 am to 5:00 pm Monday through Friday, with a closure from 12:00 to 1:00¹⁹. For a septic permit, submit a Determination Development Permit Application before the OSSF application; development applications use the county permit portal⁷¹⁹.

What are Karnes County subdivision plat fees?

For subdivisions outside incorporated towns or cities, Karnes County lists a plat application fee of $100 per lot without roads or $3,000 plus $100 per lot with roads, with a $500 minimum for every new subdivision²⁰. Amending a plat costs $200; revising a plat costs $100 per lot created plus publication costs²⁰. Filing a final approved plat with the Karnes County Clerk costs $111 for the first page and $100 for each additional page²⁰. These are subdivision fees, not a complete building-permit or septic-permit fee schedule, and the Commissioners Court may change them; ask the Permitting Department to confirm current charges before applying²⁰¹⁹.

Does Karnes County have zoning?

Karnes County has no county zoning in unincorporated areas⁴. Municipal zoning is different: Karnes City expressly has no zoning ordinance regulating residential or commercial land use within its city limits, while Kenedy requires uses and structures to conform to its zoning districts⁵⁶. The countywide municipal picture is incomplete, so ask the relevant city about zoning approval before relying on the unincorporated-area rule¹⁰. Wherever the parcel lies, Karnes County remains the OSSF septic-permit authority¹¹⁷. In county-governed subdivisions, standard spacing requires 1 acre for public water with conventional septic or a private well with public sewer, and 2 acres for a private well with conventional septic; dense spacing can allow smaller lots¹³. County subdivision requirements are separate from zoning: the rules specify setbacks of 25 feet from the county right-of-way and 15 feet at the sides and rear²¹.

How do septic permits work in Karnes County?

An OSSF (on-site sewage facility) built, altered, extended or repaired in Karnes County generally needs a permit, and the Permitting Department requires a Determination Development Permit Application before the OSSF application⁷¹². Obtain authorization before construction, and have the owner or installer arrange the required inspection before installation is complete; the authorization expires after one year if no final inspection occurs²²²³. Texas has a narrow 10-acre exemption, but only when every condition—including the site evaluation, single dwelling and 100-foot property-line separation—is met¹². An OSSF may receive only domestic sewage, not industrial or hazardous waste²⁴. Aerobic systems require a maintenance contract for the first two years; afterward, a single-family owner must obtain another contract within 30 days or maintain the system personally, while commercial systems need continuous coverage²⁵. When a maintenance contract is required, the provider generally inspects and reports at least every four months, with limited electronic-monitoring exceptions²⁶. Only 15.2% of Karnes County soils are rated "not limited" for a conventional drain field; other soils may need an engineered system, so arrange a site evaluation early²⁷.

Can you live in an RV or tiny home on your land in Karnes County?

Unincorporated Karnes County has no county zoning rule limiting RV, tiny-home or manufactured-home occupancy or setting a minimum dwelling size⁸. An RV or tiny home still needs a lawful sewage solution, and constructing, altering, extending or repairing an OSSF generally requires a septic permit¹². Karnes County handles OSSF septic permits countywide, including inside cities⁷. Subdivision setbacks and private deed restrictions can affect placement or use even without county zoning²¹. We could not confirm a county certificate-of-occupancy rule, so ask the Permitting Department before moving onto the property¹.

What are the steps to build a home in Karnes County?

Confirm whether the parcel is inside a city, a municipal extraterritorial jurisdiction or a platted subdivision, because subdivision approval and zoning rules depend on location²¹¹⁰.
For unincorporated land, ask the Karnes County Permitting Department whether a residential building permit, construction notice, inspection or floodplain approval applies; no general home-building permit is listed, and adoption of the state residential-standards order was not confirmed¹²³.
If the parcel is inside a city, ask that city about its building permit and zoning approval; Karnes City has no zoning ordinance, while Kenedy administers its own zoning districts⁵⁶.
For every address in Karnes County, start the septic-permit process with the county: order the site evaluation, file the Determination Development Permit Application and then the OSSF application unless every condition of a state exemption is met¹¹⁷¹².
Arrange the OSSF inspection before installation is complete²³.
Have a new well reviewed by the Evergreen Underground Water Conservation District before drilling¹⁵.
Obtain the applicable county-road or state-highway driveway permit¹⁴¹⁸²⁸.

What should you check before buying land in Karnes County?

Karnes County averages 31 inches of annual precipitation, with severe drought in 23.5% of years; have the Evergreen Underground Water Conservation District review a planned well before drilling²⁹³⁰¹⁵. Check mapped flood hazards before buying subdivision land: Karnes County requires flood-hazard areas on plats and additional studies where base flood elevations are missing¹⁷. For a recently divided tract, confirm county plat approval or a qualifying exemption; agricultural use alone does not satisfy every exemption condition²¹³¹. The effective property-tax rate is about 1%, with a median annual bill near $1,344 and a typical home value around $220,444³²³³³⁴.

Watch-outs

We could not confirm whether Karnes County requires a certificate of occupancy or adopted the order that would apply state residential construction standards and inspections, so ask the Permitting Department before work begins¹²³.
Karnes County subdivision rules add lot-size, setback, floodplain and driveway-access requirements; confirm whether your tract is governed by those rules before planning construction¹³²¹¹⁷¹⁴.

Sources

Written October 11, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Compared with neighboring counties

Like all 6 of its neighbors, Karnes County has no countywide zoning.

Rule	Karnes County	Wilson County	DeWitt County	Goliad County	Bee County	Atascosa County	Live Oak County
Building permit	Not required	Limited	Not required	Not required	Limited	Not required	Not required
County zoning	No	No	No	No	No	No	No
Septic permits	Karnes County	County Health & Public Safety Office	DeWitt County	County Env. Services Dept.	County Community Affairs	County Health Dept.	Live Oak County

How Karnes County scores

Seclusion55100% ev.

Self-Sufficiency3198% ev.

Admin Boringness8290% ev.

Durability38100% ev.

Property Autonomy71100% ev.

Carry Cost80100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$220kTypical home

1%Property tax

$2,951Land / acre

31"Annual rain

23.5% of yrsSevere drought

46 / yr (+30.3)Mid-century 100°F days

27.1 daysMid-century dry spell

2.22" (+5.4%)Mid-century 1-day rain

1.4×Wildfire change factor

100%Forward climate coverage

$2,052Home insurance / yr

0.6% / yrInsurance growth

0%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

15,040People within 30 min

5,014,934People within 2 hr

12,460Radius comparison (15 mi)

20.1People / sq mi

0%Federal land

99.3%Land at 15% slope or less

15.2%Soils rated "not limited" for septic (strict USDA rating)

72,208 acWorkable land screen

13%Wooded land

9 tonsBiomass / forest ac

70.5°FAvg temp

Answers from the rulebook for Karnes County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Karnes County rules

Local zoningVaries (with conditions)
Aggregate of municipal zoning within Karnes County; the county itself is not represented as administering each municipal ordinance.
- Karnes City expressly states that it has no zoning ordinance regulating residential or commercial land use within its corporate limits.
- Kenedy's official development page publishes a 2026 zoning map and identifies Codes & Ordinances, indicating municipal zoning controls within Kenedy.
- This aggregate does not establish zoning rules for unincorporated Karnes County or for every incorporated place in the county.
“Subject to Local Government Code Title 7 Subtitle “A” Chapter 211 Subchapter A “General Zoning Regulations”; The City of Karnes City does NOT have a zoning ordinance in place regulating either residential or commercial land use within it’s corporate City limits.”
Building Permits – City of Karnes, Texas ↗Re-checked Oct 7, 2026
Zoning districts · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum lot sizeSpecified
Lots in subdivisions outside the boundaries of incorporated towns or cities in Karnes County.
- Standard lot spacing: public water and public sewer has no minimum lot size; public water with conventional septic requires 1.0 acre; an individual private well with public sewer requires 1.0 acre; an individual private well with conventional septic requires 2.0 acres.
- Dense lot spacing: public water with conventional septic requires 1/2 acre; an individual private well with public sewer requires 1/2 acre; an individual private well with conventional septic requires 1.0 acre.
public water and public sewer, standard lot spacing: no minimum lot size · public water and conventional septic, standard lot spacing: >= 1 acre minimum · individual private well and public sewer, standard lot spacing: >= 1 acre minimum · individual private well and conventional septic, standard lot spacing: >= 2 acre minimum · public water and conventional septic, dense lot spacing: >= 0.5 acre minimum · individual private well and public sewer, dense lot spacing: >= 0.5 acre minimum · individual private well and conventional septic, dense lot spacing: >= 1 acre minimum
“Lots served with public water and conventional septic – 1.0 acre minimum lot size.”
Karnes County Subdivision and Development Rules and Regulations ↗Re-checked Sep 11, 2026
Setbacks · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Lot coverage · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Living in an RV · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Camping on your land · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Tiny homes · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Manufactured homes · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Who permits septicCounty
OSSF permitting administration in Karnes County, including the county's Special Projects/Septic Permits function.
- A Determination Development Permit Application is required before an OSSF application.
- Development applications are submitted through the county permit portal.
- The county page directs applicants to contact Special Projects for further information.
“Special Projects/Septic Permits A Determination Development Permit Application is required prior to an OSSF application. Development applications are submitted through the permit portal.”
Karnes County Texas — Permitting Department ↗Re-checked Sep 11, 2026
Septic permitRequired
Construction, installation, alteration, extension, or repair of an OSSF in Karnes County.
- Karnes County requires a Determination Development Permit Application before an OSSF application.
- Under the statewide TCEQ rule, a permit may be exempted under the 10-acre rule only if all listed requirements are met: site evaluation by a licensed Site Evaluator or Professional Engineer; single-family dwelling on a tract of at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; effluent disposed of on the property; and the dwelling is the only dwelling on the tract.
- Emergency repairs listed by TCEQ do not require a permit but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- Grandfathered systems may be exempt only if they meet TCEQ's stated pre-authorization-date or pre-September-1-1989, nuisance, repair, and alteration conditions.
10-acre exemption tract size: >= 10 acres (All TCEQ 10-acre-rule conditions must also be met.) · OSSF setback under 10-acre rule: >= 100 feet from property line (Applies to the exemption, not necessarily every permitted system.) · Emergency-repair reporting deadline: 72 hours after repairs begin (Emergency repairs must be reported in writing to the permitting authority.)
“A permit is required to construct, install, alter, extend, or repair an OSSF. Always check with your local permitting authority. Local permitting programs can be more stringent than State minimums.”
Karnes County Texas — Permitting Department ↗Re-checked Sep 11, 2026
Septic inspectionLimited
Aerobic OSSF systems permitted through Karnes County, with specific maintenance-contract requirements stated in the county OSSF form.
- The system must be covered by a maintenance contract for the first two years.
- After the initial two-year service agreement, an owner of an aerobic treatment system for a single-family residence must obtain a maintenance contract within 30 days or maintain the system personally.
- Commercial aerobic treatment systems must maintain a continuous maintenance contract.
initial maintenance-contract period: 2 years · deadline to obtain post-contract maintenance contract for single-family aerobic system: 30 days (after the initial two-year service agreement if the owner does not maintain the system personally)
“This OSSF shall be covered by a maintenance contract for the first two years. After the initial two-year service agreement, the owner of an aerobic treatment system for a single family residence shall either obtain a maintenance contract within 30 days or maintain the system personally. All commercial aerobic treatment systems shall maintain a continuous maintenance contract.”
Application for On-Site Sewage Facility — Affidavit to the Public ↗Re-checked Sep 27, 2026
One more reviewed finding on this topic
- Required — Installation of an on-site sewage facility under the Karnes County OSSF permitting program.
  “You or your installer must contact the approving office prior to completion to arrange the required facility inspection. The authorization to construct is valid for one year from the date of issue. If a final inspection has not been performed within one year of issue, a new application and fee will be required.”
  Application for On-Site Sewage Facility ↗Re-checked Sep 27, 2026
Well permitLimited
Water wells in Karnes County within the Evergreen Underground Water Conservation District, whose boundaries are coterminous with Karnes County.
- All new wells must be reviewed by EUWCD before drilling begins.
- A well may be exempt from a production permit but must be registered with the District when it produces less than 25,000 gallons per day, approximately 17.5 gallons per minute.
- A production permit is required before drilling or operating a well capable of producing more than 25,000 gallons per day or used for public water supply, irrigation, commercial, or industrial purposes.
- Permitted wells must meet spacing requirements, production limits, and reporting requirements.
production threshold for production permit: > 25000 gallons per day (Smaller exempt wells do not require a production permit but must be registered.) · approximate production threshold: > 17.5 gallons per minute (EUWCD describes this as approximately equivalent to 25,000 gallons per day.)
“Certain wells in the Evergreen Underground Water Conservation District (EUWCD) must be registered or permitted, depending on their size and use. If your well is capable of producing more than 25,000 gallons per day (or 17.5 gallons per minute), or if it is used for public water supply, irrigation, commercial, or industrial purposes, a production permit is required before drilling or operating.”
What We Do — Evergreen Underground Water Conservation District ↗Re-checked Sep 11, 2026
Agricultural exemptionAvailable (with conditions)
Exemptions from Karnes County subdivision platting requirements for tracts outside municipal limits.
- Agricultural, farm, ranch, wildlife-management, or timber-production exemption: the owner must not lay out streets, alleys, squares, parks, or other parts described by Local Government Code Section 232.001(a)(3), and the land must be used primarily for the specified agricultural or production purposes.
- Other listed exemptions include family transfers of four or fewer parts, subdivisions with all lots more than 10 acres, veteran sales through the Veterans' Land Board program, certain political-subdivision floodplain transfers, specified two-part transfers, state-owned tracts, lender-related divisions, and adjoining-landowner sales.
- The county rules were revised 05/30/2013; that revision date is not treated as an effective date.
agricultural exemption lot division: two or more parts (All lots must be used primarily for agricultural, farm, ranch, wildlife-management, or timber-production purposes, and no part described by Local Government Code Section 232.001(a)(3) may be laid out.) · large-lot exemption: > >10 acres per lot (The owner must not lay out a part described by Local Government Code Section 232.001(a)(3).)
“The owner does not lay out a part of the tract described by Local Government Code Section 232.001(a) (3) Texas Local Government Code and the land is to be used primarily for agricultural use, as defined by Section 1-d, Article VIII, Texas Constitution, or for farm, ranch, wildlife management, or timber production use within the meaning of Section 1 -d- 1, Article VIII, Texas Constitution; or”
Karnes County Subdivision and Development Rules and Regulations ↗Re-checked Sep 11, 2026
Subdividing landRegulated (with conditions)
Subdivision plats and related development in areas outside the boundaries of incorporated towns or cities in Karnes County; subdivisions within a municipality's extraterritorial jurisdiction are governed according to the applicable interlocal agreement.
- The Commissioners Court of Karnes County administers the rules and delegates initial review to the Karnes County Development Review Committee.
- Owners who subdivide must comply with the regulations and submit an approval application.
- No subdivision is permitted until fees are paid, required data, attachments, third-party approvals, and deficiencies are addressed; the final plat must receive Commissioners Court approval with appropriate bonds.
- The final record plat must be recorded within fifteen working days after Commissioners Court approval or the approval is voided.
- If the subdivision is within an incorporated municipality's extraterritorial jurisdiction, the plat is approved according to the interlocal agreement between that municipality and the County.
- State, federal, and applicable regulations take precedence in the event of conflict.
- Exemptions from Article II platting requirements include qualifying agricultural, farm, ranch, wildlife-management, or timber-production uses; qualifying family transfers involving four or fewer parts; divisions where all lots exceed 10 acres and no public-use area described by Local Government Code §232.001(a)(3) is laid out; qualifying Veterans' Land Board sales; qualifying political-subdivision floodplain sales to adjoining landowners; certain two-part transfers where one part is retained and the other is transferred for further subdivision; transfers to owners of undivided interests when a plat is filed before further development; qualifying state-owned land; qualifying lender-related two-part divisions with at least two acres per part, 40 feet of deeded road frontage, no third-party conveyance, and no public-use area; and qualifying two-part sales to an adjoining landowner with at least two acres remaining, 40 feet of deeded road frontage for each tract, and no public-use area.
- A family exemption claimant must file Attachment 18 with the Karnes County Clerk contemporaneously with the deed or other conveyance instrument and provide a filed copy to the Karnes County 911 Special Projects Office.
- A non-standard plat may be approved when full platting requirements would unfairly burden the property owner without promoting public welfare; a variance may be requested in writing before the standard plat application, except as to fees and financial guarantees.
- Application fees are non-refundable and are set forth in Attachment 1; the Commissioners Court may amend those fees without amending the remainder of the regulations.
- The document is marked Revised 05/30/2013; this revision notation is not treated as an effective date.
final plat approval period: 60 days after receipt of completed plat application (Approval must be by Commissioners Court with appropriate bonds.) · recording deadline: 15 working days after Commissioners Court approval (Approval is voided if the record plat is not timely recorded.) · building setback from County right-of-way: 25 feet · side setback: 15 feet · rear setback: 15 feet · minimum embankment/back-slope easement: >= 20 feet · minimum road frontage: >= 40 feet (Lots may not be narrower than 40 feet between the road frontage and the bulk of the lot.) · minimum lot size with public water and public sewer: none · minimum lot size with public water and conventional septic: >= 1 acre · minimum lot size with individual private well and public sewer: >= 1 acre · minimum lot size with individual private well and conventional septic: >= 2 acres · dense lot spacing with public water and conventional septic: >= 0.5 acre · dense lot spacing with individual private well and public sewer: >= 0.5 acre · dense lot spacing with individual private well and conventional septic: >= 1 acre
“Individuals recording plats that are outside of city limits and subject to County policy should review the current Karnes County Subdivision Regulations Revisions”
Karnes County Subdivision and Development Rules and Regulations ↗Re-checked Sep 27, 2026
Driveway accessRequired
Driveway access onto a publicly dedicated roadway from lots within a subdivision governed by the Karnes County subdivision rules.
- The driveway must be constructed according to specifications stated within the permit.
- In some cases, the developer may be required to design and construct driveways to conform to county standards.
- The rules apply to subdivisions outside incorporated towns or cities; municipal extraterritorial-jurisdiction arrangements may apply instead.
“no driveway constructed on any lot within this subdivision shall be permitted access onto a publicly dedicated roadway unless a Driveway Permit has been issued by the Karnes County Health and Public Safety Office. The driveway shall be constructed according to specifications stated within the permit.”
Karnes County Subdivision and Development Rules and Regulations ↗Re-checked Sep 11, 2026
Building in a floodplainLimited
Subdivision development involving mapped or identified 100-year floodplain, regulatory floodway, or FEMA Special Flood Hazard Area in areas governed by the Karnes County subdivision rules.
- FEMA Special Flood Hazard Areas identified by the most current FEMA Flood Insurance Rate Maps must be shown on the plat.
- Lots in the 100-year floodplain require additional contours identifying the floodplain and regulatory floodway, if any.
- If base flood elevations have not been established, a detailed study is required under the Karnes County Flood Damage Prevention Order and the developer must submit the study results to FEMA for approval.
- Required finished-floor elevations and drainage information must be shown or submitted where applicable.
- These rules apply to subdivisions outside incorporated towns or cities.
contour interval for elevation contours: <= 10 feet maximum (flood-prone areas or areas required by an engineer must be shown at 2-foot intervals) · stormwater analysis watershed threshold: > 10 acres
“All Special Flood Hazard Areas (SFHA) identified by the most current Flood Insurance Rate Maps published by the Federal Emergency Management Agency (FEMA) shall be shown on the plat.”
Karnes County Subdivision and Development Rules and Regulations ↗Re-checked Sep 11, 2026
Permit feesPublished (with conditions)
Subdivision development fees for subdivisions outside the boundaries of incorporated towns or cities in Karnes County.
- The listed fees are subject to change.
- The regulations state that fees may be amended by the Commissioners’ Court without amending the remainder of the regulations.
- These are subdivision fees, not a complete fee schedule for every county permit.
application fee for plat without roads: per 100 USD per lot · application fee for plat with roads: 3000 + 100 per lot USD · minimum application fee for all new subdivisions: 500 USD · application fee to amend a plat: 200 USD · application fee to revise a plat: per 100 USD per lot created (plus all publication costs) · application fee to cancel a plat: per 100 USD per lot (plus all publication costs) · filing fee for final approved plat: 111 first page; 100 each additional page USD (paid to the Karnes County Clerk at filing) · application fee for non-standard plat or variance: 100 USD · Texas Veterans Exclusion Request: 100 USD · hard copy of subdivision regulations: 25 USD
“Application fee for Plat without roads $100.00/lot Application fee for Plat with roads $3,000 + $100.00/lot Minimum application fee for all new subdivisions $500.00”
Karnes County Subdivision and Development Rules and Regulations ↗Re-checked Sep 11, 2026
Permit processPartial
Subdivision approval and OSSF permitting processes administered by Karnes County for applicable unincorporated areas.
- The subdivision rules apply to subdivisions outside incorporated towns or cities.
- A subdivision in a municipality's extraterritorial jurisdiction is approved according to the applicable interlocal agreement.
- For OSSF construction, authorization must be obtained before construction and inspection must be arranged before completion.
“A Determination Development Permit Application is required prior to an OSSF application. Development applications are submitted through the permit portal.”
Karnes County Permitting Department ↗Re-checked Sep 11, 2026
County-wide zoningAbsent
Texas counties have no general zoning authority over unincorporated land and Karnes County's permitting page lists no zoning program.
Karnes County Special Projects & Permits ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

Building permitLimited
New residential construction in an unincorporated area of a Texas county that has adopted a resolution or order requiring application of Local Government Code Chapter 233, Subchapter F.
- Subchapter F applies only if the county has adopted a resolution or order requiring its application.
- The county must be within 50 miles of an international border or have a population of more than 100.
- New residential construction includes a single-family house or duplex on a vacant lot and certain additions increasing existing residential square footage or value by more than 50 percent.
- The standards apply only to new residential construction that begins after September 1, 2009.
- A municipality's building code controls in its extraterritorial jurisdiction if the municipality has adopted one there.
- Subchapter F does not require prior county approval before new residential construction begins.
- Subchapter F does not authorize county zoning regulations and does not affect Chapter 232 land-development provisions; Chapter 232 controls in a conflict.
- A county may not charge a fee to defray the costs of enforcing Subchapter F standards.
applicable building standard: International Residential Code published as of May 1, 2008, or the version applicable in the county seat
“This subchapter may not be construed to: (1) require prior approval by the county before the beginning of new residential construction;”
Texas Local Government Code Chapter 233 ↗Re-checked Oct 4, 2026
One more reviewed finding on this topic
- Limited — Industrialized housing or buildings installed in Texas, including purchasers or lessees acquiring a unit for their own or their company’s use.
  “A person who is a retailer of industrialized housing or buildings, or who is responsible for the assembly, connection, and on-site construction and erection of an industrialized house or building for persons other than themselves, must be registered as an industrialized builder. Subcontractors do not require the registration unless required by other applicable state laws. For example, electricians, HVAC contractors, and plumbers must be licensed in accordance with the applicable state law. If you are purchasing or leasing an industrialized house or building for your own use, or your company's use, you may file for an installation permit in lieu of registering as an industrialized builder.”
  tdlr.texas.gov ↗Re-checked Oct 1, 2026
Owner-builder exemptionConditional
An owner performing electrical, plumbing, or air-conditioning and refrigeration work on the owner's own residence or homestead in Texas.
- Electrical work is exempt from state electrician licensing when performed on a dwelling the person owns and resides in.
- Plumbing is exempt from state plumbing licensing when performed by the property owner in the property owner's homestead.
- Air-conditioning and refrigeration contracting is exempt from the applicable state registration requirements when performed in a building owned solely by the person as the person's home.
- These exemptions do not establish a blanket exemption for every construction trade or contractor-regulated activity.
“A person who perform electrical work on a dwelling that they own and reside in is not required by the state to be licensed as electricians.”
Exemptions to Electrician Licensing ↗Re-checked Oct 3, 2026
2 more reviewed findings on this topic
- Available (with conditions) — Penalty under Texas Local Government Code Section 233.157 for failure to provide required inspection notices under Chapter 233, Subchapter F
  “An individual who fails to provide proper notice in accordance with Sections 233.154(b) and (c) is not subject to a penalty under this subsection if: (1) the new residential construction is built by the individual or the individual acts as the individual's own contractor; and (2) the individual intends to use the residence as the individual's primary residence.”
  Local Government Code Chapter 233. County Regulation of Housing and Other Structures ↗Re-checked Sep 27, 2026
- Conditional — Electrical work on a dwelling owned and occupied by the property owner in Texas.
  “A person who perform electrical work on a dwelling that they own and reside in is not required by the state to be licensed”
  Exemptions to Electrician Licensing ↗Re-checked Oct 4, 2026
Building code adoptedPartial
Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.
- The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
- The effective date is July 1, 2024.
- The International Existing Building Code applies to alterations of portable industrialized buildings.
- Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
- Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
- Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.
effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)
“July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Partial — Industrialized housing and buildings, modules, and modular components built for Texas under the Industrialized Housing and Buildings program.
  “Effective July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
  Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Oct 5, 2026
InspectionsRequired
New residential construction subject to Chapter 233, Subchapter F in an unincorporated area of a Texas county that has adopted the required resolution or order.
- The builder must arrange the inspections with a licensed engineer, registered architect, professional inspector licensed by the Texas Real Estate Commission, qualifying plumbing inspector, building inspector employed by a political subdivision, or an individual certified as a residential combination inspector by the International Code Council.
- For construction on a vacant lot, at least three inspections are required: foundation before concrete placement, framing and mechanical systems before covering with drywall or other interior wall covering, and completion of construction.
- For an addition to an existing residence, inspections are performed as necessary based on the project's scope of work.
- If required by the county, the builder must provide pre-construction notice of the location, approximate commencement date, and International Residential Code version.
- If required by the county, within 10 days after the final inspection the builder must submit notice stating whether the inspection showed compliance.
- The county may enforce failures to submit required notices through regulatory referral, injunctive relief, or prosecution, subject to the statutory exceptions and defenses.
- Subchapter F applies only if the county adopted a resolution or order and meets the statutory geographic or population condition.
minimum inspections for vacant-lot new residential construction: >= 3 inspections (Additions require inspections as necessary based on scope of work) · post-final-inspection notice deadline: <= 10 days (Applies if the county requires the notice)
“for new residential construction on a vacant lot, a minimum of three inspections must be performed during the construction project”
Texas Local Government Code Chapter 233 ↗Re-checked Oct 4, 2026
Off-grid sanitationLimited
Off-grid wastewater sanitation through an OSSF in Texas.
- An OSSF generally requires a permit and approved plan before construction, installation, alteration, extension, repair, or operation.
- A qualifying single-family dwelling on a tract of at least 10 acres may use the 10-acre permitting exemption only if every stated site-evaluation, setback, nuisance, groundwater, on-site disposal, and single-dwelling condition is met.
- Local permitting authorities may impose requirements more stringent than state minimums.
- Emergency repairs are exempt from permitting only for the listed repair types and must be reported in writing within 72 hours after repairs begin.
10-acre exemption tract size: >= 10 acres (all TCEQ conditions must be satisfied) · 10-acre exemption OSSF setback: >= 100 feet from property line (all parts of the OSSF)
“An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Oct 5, 2026
2 more reviewed findings on this topic
- Limited — Domestic sewage treatment and disposal through an OSSF rather than centralized sewer service in Karnes County.
  “OSSFs can handle only domestic sewage. Industrial or hazardous waste cannot enter an OSSF; this waste will be treated in the soil and will ruin an OSSF by literally killing the bacteria that break down the biosolids.”
  Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 11, 2026
- Limited — Composting toilets used as on-site sewage facility treatment systems in Texas.
  “Composting toilets will be approved by the executive director provided the system has been tested and certified under NSF International Standard 41 (1999) or under any other standards approved by the executive director.”
  Chapter 285 — On-Site Sewage Facilities ↗Re-checked Oct 5, 2026
county zoning authorityLimited
Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
- Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
- The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.
Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
One more reviewed finding on this topic
- Limited — County zoning authority over unincorporated land in Texas, where a specific statutory grant applies.
  “As you suggest, a county has very limited and specific zoning authority, and none that may be used to regulate construction or operation of the proposed facility.”
  Morales Letter Opinion No. 97-085 ↗Re-checked Oct 5, 2026
county building authorityLimited
Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.
- Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
- Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
- The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
- A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
- The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
- Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
- Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
- A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
- Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.
county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)
“The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026
One more reviewed finding on this topic
- Limited — County fire-code adoption and building-permit authority for specified buildings in unincorporated areas of qualifying Texas counties, including multifamily residential dwellings of four or more units.
  “The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code.”
  Texas Local Government Code, Chapter 233 ↗Re-checked Oct 5, 2026

Inside cities and towns in Karnes County

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

Local zoningAbsent
Residential and commercial land use within the corporate limits of Karnes City, Karnes County, Texas.
- The statement is limited to Karnes City's corporate city limits.
- Other municipal codes, deed restrictions, building regulations, manufactured-home permit requirements, and state requirements may still apply.
“Subject to Local Government Code Title 7 Subtitle “A” Chapter 211 Subchapter A “General Zoning Regulations”; The City of Karnes City does NOT have a zoning ordinance in place regulating either residential or commercial land use within it’s corporate City limits.”
Building Permits – City of Karnes, Texas ↗Re-checked Oct 7, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Certificate of occupancy — Certificates of occupancy or equivalent occupancy approvals in Karnes County
Mandatory utility hookup — Connection to centralized water or wastewater utilities for property in Karnes County.
Short-term rentals — Short-term rental use of residential property in unincorporated Karnes County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Karnes County, Texas

Is Karnes County a good place to live off-grid or homestead?

Karnes County scores 56/100 on the Bolthole Index, a solid county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost. Watch-outs: workable self-sufficiency basics (31″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Karnes County, Texas?

Karnes County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Karnes County (OSSF Authorized Agent under TCEQ). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Karnes County?

Living in an RV on your own land in Karnes County is allowed: Unincorporated Karnes County: no county rule sets this, because Karnes County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.karnes.tx.us. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Karnes County, Texas?

Land in Karnes County runs about $2,951 per acre, based on the latest county data.

What is the water situation in Karnes County?

Karnes County gets about 31" of rain a year, with severe drought in roughly 23.5% of years.

How remote is Karnes County?

A representative private-land location has about 15,040 people within a 30-minute drive and 5,014,934 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and land rules in Karnes County, Texas

At a glance

Who to call

Do you need a building permit in Karnes County, Texas?

Who handles building-permit questions, septic permits and road permits in Karnes County?

What are Karnes County subdivision plat fees?

Does Karnes County have zoning?

How do septic permits work in Karnes County?

Can you live in an RV or tiny home on your land in Karnes County?

What are the steps to build a home in Karnes County?

What should you check before buying land in Karnes County?

Watch-outs

Sources

Compared with neighboring counties

Karnes County in Texas

How Karnes County scores

Find land. Bring the promising ones back.

Parcel due diligence

Cities and towns in Karnes County

Answers from the rulebook for Karnes County

Karnes County rules

Texas rules that apply here

Inside cities and towns in Karnes County

Still unanswered

Living off-grid in Karnes County, Texas

Is Karnes County a good place to live off-grid or homestead?

Do you need a building permit in Karnes County, Texas?

Can you live in an RV or tiny home on your land in Karnes County?

How much does land cost in Karnes County, Texas?

What is the water situation in Karnes County?

How remote is Karnes County?

How Karnes compares in Texas