Bolthole Index

Caldwell County, Texas

Building permits, zoning and septic rules in Caldwell County, Texas

58Index Score / 100
#100 of 254 in Texas

Unincorporated Caldwell County, Texas requires a Residential Construction Permit before you build or install a residential structure, including a manufactured home or an RV used as housing12. The county has no countywide zoning, but municipal or special-purpose zoning can still affect some parcels34. Caldwell County Sanitation/Development Services handles residential construction and septic permits56.

At a glance

Building permit
Residential Construction Permit required; published fee is $225 and the permit is valid for 2 years172
Zoning
No countywide zoning in unincorporated areas; municipal and special-purpose rules can still apply34
Septic permits
County permit, site evaluation and installation inspection required89
RV / tiny home living
No county zoning restriction, but an RV used as housing falls within the residential permit definition102
Manufactured home
Residential permit required; mobile homes must be anchored and have a closed-in foundation2
Owner-builder exemption
We could not confirm one; ask Sanitation/Development Services115
Water
Permit application may use utility proof, a private-well log or a certified rainwater system12
Driveway access
County right-of-way work needs a county permit; state-highway access follows TxDOT's process1314

Who to call

Building permits

Caldwell County Sanitation/Development Services

Residential and commercial site construction permits, subdivision and development review, floodplain management, platting, and code enforcement for unincorporated Caldwell County.

(512) 398-1803

1700 FM 2720, Lockhart, TX 78644

Septic permits

Caldwell County Sanitation/Development Services

OSSF (septic) permits, inspections and complaints for unincorporated Caldwell County; application forms include a dedicated Application for Septic Permit.

(512) 398-1803

1700 FM 2720, Lockhart, TX 78644

Codes & inspections

Caldwell County Development Ordinance (Sec. 4.4, Residential Construction Permit)

The county's own written ordinance defining what requires a Residential Construction Permit, what's exempt, what a residential structure is (including manufactured homes and RVs used as housing), and what an application must include.

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Off-grid gear

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

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

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

Unincorporated Caldwell County, Texas requires a Residential Construction Permit for a new residential structure, an addition that increases bathroom or bedroom count, or major rebuilding after fire or flood12. The published residential permit fee is $225, and starting work before approval doubles the applicable fee7. Caldwell County exempts enclosing a staircase or porch, a carport for fewer than 10 cars, a deck, roof replacement, exterior-facade remodeling and sidewalk construction2. The permit remains valid for 2 years or until construction is complete2. An application needs land and ownership records, current tax certificates, and a site sketch that identifies the proposed work, access, property lines, floodplain, easements, wells and septic components2.

Who is the Caldwell County building department, and how do you reach them?

Caldwell County Sanitation/Development Services handles residential and commercial site construction permits, septic permits and inspections, subdivision and development review, floodplain management, platting and code enforcement5. The office is at 1700 FM 2720, Lockhart, TX 78644, and its phone number is (512) 398-18035. Call for an appointment before submitting a project5. Caldwell County publishes applications for residential construction, septic, subdivision, floodplain, construction and variance requests, along with its development fee schedule15. A parcel split or subdivision adds another layer: Commissioners Court approval is required before a subdivision or resubdivision plat can be recorded, and projects in a municipality's ETJ may also require submission to that municipality16. After you submit a construction application, the County Engineer reviews it, and a noncompliant first submittal is returned with comments within 10 calendar days; applicants are expected to respond within 7 calendar days, and an application can be deemed withdrawn after 10 days without a response17.

Does Caldwell County have zoning?

Unincorporated Caldwell County has no countywide zoning or general county land-use zoning power3. At the county level, that means no zoning rule sets minimum dwelling size, minimum lot size, setbacks, lot coverage or building height10. Parcel-specific rules can still come from a city or a special-purpose district; airport zoning administered by the City of San Marcos may affect development within its hazard area in Caldwell County4. No countywide zoning does not mean no permits: residential construction, septic, floodplain work, subdivisions and county-road access remain regulated through other county processes181613. Before relying on the countywide answer, ask Sanitation/Development Services whether the parcel lies in a municipal ETJ, airport hazard area or another special jurisdiction45.

How do septic permits work in Caldwell County?

Caldwell County Sanitation/Development Services issues OSSF permits and requires a site evaluation to determine soil suitability and the system type86. The regular single-family conventional-system fee is $400, the engineered-system fee is $450, and an approved permit is valid for 1 year and is non-refundable8. A complete design receives a 5-day review if no design changes are needed15. Type 1a soil, floodplain sites and subdivisions restricted to engineered systems require design by an engineer or registered sanitarian8. Installation requires advance notice for an inspection and an installer or installer apprentice must be present; successful inspection leads to the permit to operate9. Texas's 10-acre exemption may apply only when every state condition is met, including one home, a qualifying site evaluation and at least 100 feet between every system component and a property line18. Tank replacement carries a $100 fee and reworking existing drain fields a $200 fee19. Septic and site-construction applications may be processed at the same time17.

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

Caldwell County has no county zoning restriction on RV occupancy, temporary camping, tiny-home occupancy or manufactured-home occupancy in unincorporated areas10. A separate permit rule still matters: the Development Ordinance defines a residential structure to include a manufactured home or recreational vehicle used to house a family, so an RV used as housing falls within the Residential Construction Permit framework2. A tiny home used as a dwelling also fits the county's general permit requirement for construction or installation of a residential structure1. Mobile homes must be tied down or anchored and have a closed-in foundation2. Ask Sanitation/Development Services how the office will classify the exact unit and setup before delivery, especially if the plan is temporary occupancy during construction5. Municipal or airport-area rules may differ on affected parcels4.

What are the steps to build a home in Caldwell County, Texas?

  1. Call Caldwell County Sanitation/Development Services at (512) 398-1803 to identify the residential, septic, floodplain, subdivision and access approvals for the parcel5.
  2. Confirm whether municipal, ETJ or airport-area rules add another review416.
  3. Assemble the property description, ownership record, current tax certificates and site sketch required for the residential application2.
  4. Document potable water with a utility receipt or bill, a private-well driller's log, or an engineered or certified rainwater system12.
  5. Complete the septic site evaluation and secure the county OSSF permit before installation8.
  6. Apply for county driveway approval when work touches a county right-of-way; a new or materially changed driveway must be accompanied by a driveway permit application with the site permit, and the listed driveway right-of-way permit fee is $5020.
  7. Use TxDOT's Form 1058 instead when access connects to a state highway14.
  8. Obtain the residential permit before work begins to avoid doubled fees7.

What should you check before buying land in Caldwell County, Texas?

Ask Sanitation/Development Services whether the parcel is in or within 300 feet of a floodplain, because that changes floor-elevation and permit documentation requirements2. Only 3.8% of Caldwell County soils are rated without severe limitations for a conventional drain field, so get the septic site evaluation before fixing the house site or purchase budget218. If any FEMA floodplain lies within the construction area, a floodplain permit or LOMR/CLOMR is needed, the listed floodplain permit or revision fee is $750 plus consultant reimbursement, and a floodplain setback of up to 25 feet beyond the 100-year floodplain can apply22. Confirm access too: county right-of-way work needs a county permit, while a state-highway connection follows TxDOT's separate process1314. If land will be divided, verify plat approval and whether ETJ review applies before closing16. Finally, identify the potable-water plan; the residential application accepts utility documentation, a private-well driller's log, or an engineered or certified rainwater system, but we could not confirm the separate water-well permitting authority12.

Watch-outs

  • Caldwell County's ordinance does not state whether an owner-builder exemption applies to the Residential Construction Permit; ask Sanitation/Development Services directly before you plan to self-build115.
  • Countywide zoning is absent, but municipal and special-purpose zoning can still affect a parcel, including San Marcos airport zoning in its hazard area34.
  • A septic permit in the 100-year floodplain will not issue until the development permit for the served structure is approved8.
  • We could not confirm a county certificate-of-occupancy rule, an adopted county building-code edition, or who permits private water wells; ask Caldwell County Sanitation/Development Services before you design or drill5.

Sources

  1. Caldwell County Development Ordinance (2026 county census)
  2. Caldwell County Development Ordinance (Sec. 4.4, Residential Construction Permit) (co.caldwell.tx.us)
  3. Commissioners approve resolution regarding data centers, quoted and re-checked
  4. Commissioners approve resolution regarding data centers, quoted and re-checked
  5. Caldwell County Sanitation/Development Services (co.caldwell.tx.us)
  6. Caldwell County Sanitation/Development Services (co.caldwell.tx.us)
  7. Caldwell County Subdivision and Development Fee Schedule, quoted and re-checked
  8. Application for Private Sewage Facility Construction Permit, quoted and re-checked
  9. Application for Private Sewage Facility Construction Permit, quoted and re-checked
  10. Texas law on county zoning and building authority
  11. Exemptions to Electrician Licensing (2026 county census)
  12. Construction Application, quoted and re-checked
  13. Caldwell County Development Ordinance, quoted and re-checked
  14. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  15. Sanitation/Development Services, quoted and re-checked
  16. Caldwell County Development Ordinance, quoted and re-checked
  17. Caldwell County Development Ordinance, quoted and re-checked
  18. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
  19. Caldwell County Septic Application Packet, quoted and re-checked
  20. Caldwell County Development Ordinance, quoted and re-checked
  21. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  22. Caldwell County Development Ordinance, quoted and re-checked

Written October 10, 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.

Found land here? Start a Property Hunt →

Compared with neighboring counties

Unlike all 6 of its neighbors, Caldwell County requires a building permit for a home.

RuleCaldwell CountyGonzales CountyGuadalupe CountyBastrop CountyHays CountyTravis CountyFayette County
Building permitRequiredNot requiredNot requiredNot requiredLimitedLimitedLimited
County zoningNoNoNoNoNoNoNo
Septic permitsCounty SanitationCounty Permit OfficeCounty Env. Health Dept.County Development ServicesCounty Development ServicesCounty TNRCounty Health Dept.

County locator

Caldwell County in Texas

58
County map
Caldwell County highlighted among the Texas counties · colored by Index score

How Caldwell County scores

Seclusion38100% ev.
Self-Sufficiency5096% ev.
Admin Boringness5990% ev.
Durability43100% ev.
Property Autonomy71100% ev.
Carry Cost73100% ev.

Evidence strength: 97%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$288kTypical home
1.3%Property tax
$4,814Land / acre
35.5"Annual rain
24.6% of yrsSevere drought
39.6 / yr (+27.9)Mid-century 100°F days
25.7 daysMid-century dry spell
2.29" (+7.1%)Mid-century 1-day rain
1.43×Wildfire change factor
100%Forward climate coverage
$1,688Home insurance / yr
0.6% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
19,669People within 30 min
7,357,981People within 2 hr
77,550Radius comparison (15 mi)
91.6People / sq mi
0%Federal land
100%Land at 15% slope or less
3.8%Soils rated "not limited" for septic (strict USDA rating)
13,296 acWorkable land screen
24.6%Wooded land
14.9 tonsBiomass / forest ac
69°FAvg temp

Scout Caldwell County

Camp here before you commitBook a few nights nearby on Hipcamp →Already own land here?Earn money hosting campers — get $100 when you become a Hipcamp host →

Some links are affiliate or referral links — we may earn a commission, at no cost to you.

Property hunt

Find land. Bring the promising ones back.

Search live inventory elsewhere, then cost and vet each candidate here. No copied listings, account, or paid data feed.

View your full hunt →
ZillowLand & lotsRealtor.comLand listingsLandSearchRural & vacant land

Each button opens a current land search for Caldwell County. Listing sites control their own results and filters.

Analyze a property
Add setup-cost allowances

Use rough quotes or placeholders. Blank fields count as $0.

Working estimate

—land + entered setup costs
Asking $ / acre
—
Setup allowance
—
All-in $ / acre
—

A planning estimate, not a valuation or contractor quote. The USDA benchmark includes farm land and buildings; it is context, not a parcel comp.

Before an offer

Parcel due diligence

0/8 checked

Saved properties and checklist progress stay on this device. Bolthole Index does not receive them.

Cities and towns in Caldwell County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Answers from the rulebook for Caldwell County

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

Caldwell County rules

  • County-wide zoningAbsent

    County zoning or land-use regulatory powers in unincorporated Caldwell County.

    • Municipal zoning and special-purpose zoning may still apply to particular areas, including airport-related zoning administered by the City of San Marcos.
    “The resolution acknowledged citizen concerns about data centers that include impacts on quality of life, public health and the environment and detailed the limitations of county government to regulate development, reminding citizens that counties do not have zoning or land-use regulatory powers like cities do.”
  • Local zoningVaries (with conditions)

    Aggregate of municipal and special-purpose zoning affecting land in Caldwell County; the county itself does not administer each local ordinance.

    • Caldwell County states that counties do not have zoning or land-use regulatory powers like cities do.
    • The City of San Marcos airport zoning ordinance may apply to some development in Caldwell County within the identified hazard zone.
    “The City has passed an airport zoning ordinance and incorporated that into the City Code in Article 3, Section 10. This ordinance regulates, as allowed by state law, development height to prevent hazards to the City's airport and land use compatibility in the neighborhood of the airport.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Minimum dwelling size · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Minimum lot size · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Setbacks · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Lot coverage · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Building height · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Living in an RV · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Camping on your land · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Tiny homes · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Manufactured homes · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Accessory dwellings · by state lawNo county rule

    Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning.

    • 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.”
  • Who permits septicCounty

    On-site sewage facility permitting and inspection administration by Caldwell County Sanitation/Development Services.

    • The county page directs applicants to the county sanitation department for septic permits, inspections, or complaints.
    “To All Persons Applying for Septic Permit Caldwell County”
  • Septic permitRequired

    Construction of private sewage facilities in Caldwell County.

    • A completed application, site evaluation, approved 911 address, proof of ownership, tax statement, and other listed materials must be submitted before the permit review.
    • A site evaluation determines soil type and site suitability and determines the type of system that can be installed.
    • If the site has Type 1a soil, is in the floodplain, or is in a subdivision restricted to engineered systems, an engineer or registered sanitarian is required.
    • An approved permit is good for one year and is non-refundable.
    • A permit to operate is granted after successful inspection showing compliance with TCEQ construction standards.
    • If the lot is in the 100-year floodplain, a permit to construct the OSSF will not be issued until a development permit has been approved for the structure using the facility.

    permit validity: 1 year (approved permit is non-refundable) · single-family conventional-system fee: 400 USD · single-family engineered-system fee: 450 USD

    “After this office receives the following items, a five day review (if no changes to the design) of the submittal is necessary before permit is issued.”
  • Septic inspectionRequired

    Construction and operation approval of private sewage facilities in Caldwell County.

    • The office requires 24 hours' notice to request an inspection.
    • An installer or installer apprentice must be on site during construction and inspection.
    • A permit to operate follows successful inspection of the installed system.
    • Maintenance contracts are required when applicable.

    inspection notice: >= 24 hours

    “A twenty-four hour notice must be given to this office (512-398-1803) requesting an inspection. An installer or an installer apprentice shall be on-site during construction and inspection.”
    One more reviewed finding on this topic
    • Required — Construction and operation approval for on-site sewage facilities.
      “A twenty-four hour notice must be given to this office (512-398-1803) requesting an inspection. An installer or an installer apprentice shall be on-site during construction and inspection.”
  • Off-grid sanitationAllowed (with conditions)

    Private on-site sewage facilities used instead of centralized sewer where approved by Caldwell County.

    • An approved OSSF permit and successful inspection are required.
    • Floodplain sites require an approved development permit before an OSSF construction permit is issued.
    “a permit to operate the facility will be granted”
  • Mandatory utility hookupConditional

    Water and wastewater service for subdivision and commercial-site development in unincorporated Caldwell County.

    • Applications may use a water provider, sewer provider, individual wells, standard or advanced OSSF, or other documented water/wastewater sources.
    • Subdivision applications require water and wastewater availability or intent-to-serve letters.
    • Private wells require proof such as a driller's log or an approved water-availability study.
    • OSSF proposals require county preliminary written approval or feasibility documentation under 30 TAC Chapter 285 and county regulations.
    “If water and/or wastewater services are to be provided by a municipality, corporation, or district, confirmation from the municipality, corporation, or district by certified letter or affidavit of a willingness to serve the proposed development including assurance that sufficient water and/or wastewater capacity is available.”
  • Subdividing landRegulated (with conditions)

    Subdivision platting and subdivision/site construction in unincorporated Caldwell County.

    • Subdivision applications require administrative completeness before technical review.
    • Technical review is to be completed within 30 calendar days from administrative completeness.
    • Where OSSF is proposed, preliminary written county approval and applicable feasibility reports are required.
    • Floodplain and right-of-way permits must be included when applicable.
    • A final plat may not be submitted before county-engineer approval of required subdivision construction plans.

    technical review period: 30 calendar days (measured from administrative completeness)

    “No person shall create a subdivision of land either by sale, or lease, or otherwise, within Caldwell County without complying with the provisions of these regulations, unless the Commissioners Court acknowledges that the division of land is exempt from platting as an "Exempted Subdivision."”
  • Driveway accessRequired

    New or improved driveways associated with county site construction and work in the public right-of-way.

    • If site construction includes a new driveway, improves an existing driveway, or increases site-use intensity enough to raise adequacy concerns, the site-construction application must include a driveway-permit application.
    • Driveways in the public right-of-way are subject to Appendix C design and construction requirements.
    • A driveway right-of-way permit fee is listed as $50.

    driveway right-of-way permit fee: 50 USD

    “If the site construction includes a new driveway or improvement of an existing driveway, or if it alters the intensity of the site use so as to bring into question the adequacy of the existing driveway under this ordinance, the site construction permit shall be accompanied by a driveway permit application.”
    2 more reviewed findings on this topic
    • Limited — New driveways, improvements to existing driveways, or site-use changes that raise questions about driveway adequacy; and activity in county rights-of-way.
      “If the site construction includes a new driveway or improvement of an existing driveway, or if it alters the intensity of the site use so as to bring into question the adequacy of the existing driveway under this ordinance, the site construction permit shall be accompanied by a driveway permit application. Applications for the site construction and driveway permits will be reviewed concurrently.”
    • Required — New or improved driveways associated with county-regulated site construction and driveways in county rights-of-way.
      “the site construction permit shall be accompanied by a driveway permit application.”
  • Building in a floodplainRequired

    Subdivision and construction development in or affecting FEMA-regulated floodplain areas in unincorporated Caldwell County.

    • Subdivision and construction permit applications must include detailed hydrologic and hydraulic analyses of existing and proposed base flood elevations and floodplain boundaries.
    • The County Engineer or Floodplain Administrator may require FEMA map-revision documentation.
    • A CLOMR may be required before issuance of a site or subdivision permit.
    • Floodplain applications require the applicable submittal fee and supporting studies, deeds, tax certificates, FEMA forms, and models.

    floodplain setback beyond 100-year floodplain: <= 25 feet (setbacks under Appendix G) · floodplain permit or revision fee: 750 USD (plus consultant reimbursement)

    “If FEMA Floodplain is present within the area of construction (including future homes for residential subdivisions), a floodplain permit or LOMR/CLOMR is needed and must be included with the subdivision application.”
  • Permit feesPublished

    Published Caldwell County subdivision, development, residential-construction, driveway, floodplain, and septic permit fees.

    • Fees may vary by permit type and project size.
    • The subdivision/development schedule states that fees are doubled for development or construction commenced before obtaining the appropriate approval.
    • Outside consultant costs may be reimbursed in addition to listed fees.

    residential construction permit: 225 USD · driveway right-of-way permit: 50 USD · floodplain permit or revision: 750 USD (plus consultant reimbursement) · single-family conventional septic system: 400 USD · single-family engineered septic system: 450 USD

    “Work in R.O.W Permit (Driveway) $50 Work in R.O.W. Permit (Utility - OH) $50 Work in R.O.W. Permit (road cut or other) $125 Residential Construction Permit $225”
    One more reviewed finding on this topic
    • Variable (with conditions) — County development, subdivision, inspection, and septic permitting fees.
      “Single Family Dwelling, Regular Conventional System: $400.00 Single Family Dwelling, Engineered Systems: $450.00 Tank Replacement: $100.00 Re-Work the existing drain fields $200.00”
  • Permit processPublished (with conditions)

    County development, construction, subdivision, floodplain, residential construction, and septic permit processes.

    • The county publishes applications and forms for septic, residential construction, subdivision, floodplain, construction, variance, and related permits.
    • Residential construction applications require recorded ownership, tax certificates, site information, potable-water proof, floodplain information when applicable, and an approved OSSF permit when applicable.
    • Septic submittals receive a five-day review if there are no design changes.

    septic review time: 5 days (If no changes to the design.)

    “Application for Septic Permit Application for Residential Construction Permit Mass Gathering Permit Resubmittal Form Development Fee Schedule Development Agreement Application Floodplain Application Construction Application Variance Application Traffic Impact Analysis Application”
    One more reviewed finding on this topic
    • Partial — County construction, development, subdivision, floodplain, driveway, and septic permit processes in unincorporated Caldwell County.
      “An administratively complete application for a Construction Permit will be reviewed by the County Engineer for technical and/or regulatory compliance. If the Construction Permit is determined to be non-compliant, it will be returned to the Owner with comments within ten(10) calendar days for the initial submittal.”

Texas rules that apply here

  • Building permitLimited

    Industrialized housing or buildings installed in Texas, including purchasers or lessees acquiring a unit for their own or their company’s use.

    • A person purchasing or leasing an industrialized house or building for their own use or their company’s use may file for an installation permit instead of registering as an industrialized builder.
    • A person responsible for assembly, connection, and on-site construction for persons other than themselves must be registered as an industrialized builder.
    • Municipalities may require applicable local permits and licenses before construction begins when the municipality regulates the installation.
    “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.”
  • 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.”
    One more reviewed finding on this topic
    • 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”
  • 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:”
    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:”
  • Well permitLimited

    Drilling, equipping, operating, or completing a water well, or substantially altering a well or well pump, where the well is within a groundwater conservation district in Texas.

    • A groundwater conservation district must require a permit except as provided by Texas Water Code §36.117.
    • A district may not require a permit or permit amendment for maintenance or repair that does not increase production capability above the authorized or permitted production rate.
    • Permit applications must be in writing and sworn.
    • Whether a particular private well is exempt or subject to additional district requirements depends on the applicable groundwater conservation district's rules.

    permit application form: in writing and sworn

    “Except as provided by Section 36.117, a district shall require a permit for the drilling, equipping, operating, or completing of wells or for substantially altering the size of wells or well pumps.”
  • 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.”
    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.”
  • 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.”
    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.”

Still unanswered

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

  • Inspections — General building inspections for residential or commercial construction in unincorporated Caldwell County.
  • Certificate of occupancy — Certificate-of-occupancy requirements for buildings in unincorporated Caldwell County.
  • Agricultural exemption — Agricultural land development and subdivision exemptions in unincorporated Caldwell County.
  • Short-term rentals — Short-term rental use in Caldwell 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 Caldwell County, Texas

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

Caldwell County scores 58/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and a stronger property-autonomy legal backdrop. Watch-outs: sparse surroundings — about 19,669 people within a 30-minute drive.

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

Caldwell County generally requires a residential building permit, and it has no county-wide zoning. Onsite septic is permitted by Caldwell County Sanitation / Development Services (TCEQ authorized agent). 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 Caldwell County?

Living in an RV on your own land in Caldwell County is allowed: Unincorporated Caldwell County: no county rule sets this, because Caldwell County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Caldwell County's own reviewed answer confirms it has no county-wide zoning. 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 Caldwell County, Texas?

Land in Caldwell County runs about $4,814 per acre, based on the latest county data.

What is the water situation in Caldwell County?

Caldwell County gets about 35.5" of rain a year, with severe drought in roughly 24.6% of years.

How remote is Caldwell County?

A representative private-land location has about 19,669 people within a 30-minute drive and 7,357,981 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.

How Caldwell compares in Texas

Compare side-by-side →See all 254 Texas counties ranked →