Bolthole Index

Hays County, Texas

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

46Index Score / 100
#162 of 254 in Texas

Unincorporated Hays County, Texas requires a development permit for development inside or outside a floodplain1. The Fire Marshal issues building construction permits for commercial, public and multifamily projects; new single-family homes on vacant lots need at least 3 third-party inspections23. Hays County lacks zoning authority outside the San Marcos Regional Airport zoning area, and Hays County Development Services handles septic permits for unincorporated land45.

At a glance

Building / development permit
Development permit required for all development; 3 third-party inspections for new single-family homes13
Zoning
None outside the San Marcos Regional Airport zoning area; cities set their own46
Septic permits
Required for every OSSF regardless of acreage, from Hays County Development Services75
Building codes
2018 IFC and referenced 2018 IBC for applicable commercial, public and multifamily projects; county fire code excludes single-family homes, duplexes and triplexes8
RV / tiny home / manufactured home living
Not restricted by county zoning, but a development permit still applies41
Development permit duration
Start within 1 year of issuance; complete within 2 years of issuance9
Interior renovation outside the floodplain
No development permit needed9
Driveway onto a state highway
Needs a TxDOT permit (Form 1058), not a county permit10

Who to call

Building permits

Hays County Development Services

Development permits for construction in unincorporated Hays County (new homes, additions, sheds, pools, manufactured homes, grading, driveways), plus OSSF (septic) permitting and Edwards Aquifer Protection Plan review.

512-393-2150

2171 Yarrington Road, Kyle, TX 78640

Codes & inspections

Hays County Development Services (Development Permits & Building Code FAQ)

The county's own written explanation of what needs a development permit, how long a permit lasts, what building code applies, and the state-law residential construction inspection requirement.

512-393-2150

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 Hays 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 Hays County, Texas?

Unincorporated Hays County requires a development permit for land modification inside or outside a floodplain, including houses, pools, sheds, slabs, fill and clearing1. Interior renovation of a single-family house outside the floodplain is exempt9.

The Hays County Fire Marshal issues building construction permits for commercial buildings, public buildings, places of public assembly or access, and multifamily dwellings2. Applicable projects follow the 2018 International Fire Code with local amendments and the 2018 International Building Code adopted by reference, effective January 20208. The county fire code excludes single-family homes, duplexes, triplexes and purely agricultural buildings where no workers are present and the public does not enter; other development requirements still apply811.

New single-family homes or duplexes on vacant lots, and additions increasing an existing home’s square footage or value by more than 50%, need at least 3 third-party inspections: foundation before concrete, framing/mechanical before drywall, and completion3.

Austin, mainly in Travis County but extending into Hays County, issues its own building permits within its zoning jurisdiction; Austin Water handles septic systems within Austin’s full jurisdiction and designated annexed areas1213.

Who issues building and development permits in Hays County?

Reach Hays County Development Services at 2171 Yarrington Road in Kyle, Texas, by phone at 512-393-215014. The office is open Monday through Thursday from 8 am to 5 pm and Friday from 8 am to noon14. Hays County Development Services handles development permits and septic (OSSF) permits for unincorporated land15. For questions about the building code that applies to multi-family, public, or commercial buildings, the office directs you to the Hays County Fire Marshal's Office at 512-393-73009.

Applications are submitted online through MyGovernmentOnline, and the county publishes a Development Services Fee Schedule effective January 20261516. Some projects require public notice, including notice to contiguous property owners within 200 feet15.

Does Hays County have zoning?

Hays County states that, outside the San Marcos Regional Airport zoning regulations, it lacks zoning authority4. Because the county has no general zoning, no county ordinance sets minimum home size, lot size, setbacks, lot coverage or building height for unincorporated land outside the airport area, and no county zoning rule restricts RVs, tiny homes, manufactured homes or accessory dwellings there17. Austin, which reaches into Hays County but lies mainly in Travis County, sets zoning inside its city limits; Austin Water regulates septic systems within Austin’s full jurisdiction and designated annexed areas1813. No zoning does not mean no regulation: the development permit still applies, and the county regulates land subdivision and platting through Development Services, with plat applications and subdivision construction plans19.

How do septic permits work in Hays County?

Hays County administers on-site sewage facility (OSSF) rules for unincorporated land under Texas Health and Safety Code Chapter 366, and the county requires a permit for every OSSF, whether new, replacement or altered, regardless of lot size or acreage57. The county will not issue an OSSF permit for land that violates the Hays County Development (Subdivision) Regulations7. Every residential structure must connect to a county-permitted OSSF or to a centralized sewage treatment facility permitted by TCEQ, and aerobic or advanced treatment systems need ongoing maintenance207. Only about 2.2% of Hays County soils are rated free of severe limits for a conventional drain field, so plan on a site evaluation and likely an engineered or aerobic system21. Texas lets an owner install an OSSF on his or her own single-family home only if the local permitting authority allows it, the owner also owns the land, no part is developed for sale or lease, and all local requirements are met; the owner needs the knowledge, skills and equipment, and installation helpers generally need the appropriate installer license, with exceptions for licensed electrical work and tank delivery/placement22.

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

Hays County has no zoning authority on unincorporated land outside the San Marcos Regional Airport zoning area; the absence of county zoning does not remove development or sanitation requirements4123. Land used for residential purposes must connect to a county-permitted OSSF or a TCEQ-permitted centralized sewage treatment facility, including off-grid residences23. A new single-family house on a vacant lot also needs at least 3 third-party inspections3. Ask Hays County Development Services about the development application and sewage arrangement for your proposed RV or tiny home before moving onto the land1423.

Building a home in Hays County: the steps, in order

  1. Confirm whether your parcel is unincorporated, inside a city's limits, or inside the San Marcos Regional Airport zoning area, since each has different rules6.
  2. If you are dividing land, check the county's platting and subdivision process first; an OSSF permit will not issue on land that violates the subdivision regulations197.
  3. Line up your septic site evaluation early: only about 2.2% of Hays County's soils are free of severe limits for a conventional drain field, and Development Services permits OSSFs directly2114.
  4. Apply online for your development permit before you build any new structure, addition or manufactured-home placement115.
  5. If your project needs access through county right-of-way, expect a driveway permit, submitted through the county portal24.
  6. For a new single-family house or duplex, contract a third-party inspector before you start; the county requires at least 3 inspections and performs none itself3.
  7. Start construction within 1 year of your permit's issuance, and finish within 2 years of issuance, or the permit expires9.
  8. If your driveway will connect to a state highway, apply for a TxDOT permit (Form 1058) before you build it10.

What to check before you buy land in Hays County

Septic suitability deserves an early check on Hays County land: only about 2.2% of the county's soils are rated free of severe limits for a conventional drain field, so budget for an engineered or aerobic system and a site evaluation before you make an offer21. Land is in demand here: farmland has recently been valued around $11,177 an acre, and the typical home value is about $373,0872526. Hays County is hilly and wooded, with 87% of land at 15% slope or less and about 50.9% forest cover, and gets a moderate 35.1 inches of rain a year with severe drought in about 29.4% of recent years27282930. Carrying costs run moderate to high: the effective property tax rate is about 1.7%, with a median bill around $6,420 a year, and a typical home insurance premium runs about $2,312 a year313233.

Watch-outs

  • Hays County's development permit and third-party inspections apply even though the county has no general zoning; treat 'no zoning' as an answer about land-use restrictions, not about whether you need a permit14.
  • If your land is near the San Marcos Regional Airport, confirm zoning status directly with Development Services, since airport zoning regulations are the one place the county acknowledges zoning49.
  • Hays County does not perform its own residential inspections; budget for and schedule a third-party inspector yourself before construction starts3.
  • A county well-permit rule, certificate-of-occupancy requirement and short-term-rental rule could not be confirmed; ask Hays County Development Services14.

Sources

  1. Floodplain, quoted and re-checked
  2. hayscountytx.gov, quoted and re-checked
  3. Development Services FAQs, quoted and re-checked
  4. Development & Planning, quoted and re-checked
  5. Septic Permits, quoted and re-checked
  6. Development & Planning, quoted and re-checked
  7. Septic Permits, quoted and re-checked
  8. hayscountytx.gov, quoted and re-checked
  9. Hays County Development Services (Development Permits & Building Code FAQ) (hayscountytx.gov)
  10. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  11. hayscountytx.gov, quoted and re-checked
  12. Austin: Homeowner's Permit (Hays County), quoted and re-checked
  13. Austin: On-Site Sewage Facilities (Hays County), quoted and re-checked
  14. Hays County Development Services (hayscountytx.gov)
  15. Development & Planning, quoted and re-checked
  16. Development Services Documents & Forms, quoted and re-checked
  17. Texas law on county zoning and building authority
  18. Austin: Zoning Resources & Site Regulations (Hays County), quoted and re-checked
  19. Development & Planning, quoted and re-checked
  20. hayscountytx.gov, 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. Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
  23. Septic Permits, quoted and re-checked
  24. Development Process, quoted and re-checked
  25. Farmland value per acre (USDA census): Bolthole Index county data
  26. Typical home value (Zillow): Bolthole Index county data
  27. Share of land at 15% slope or less: Bolthole Index county data
  28. Wooded share of land: Bolthole Index county data
  29. Annual precipitation: Bolthole Index county data
  30. Share of years in severe drought: Bolthole Index county data
  31. Effective property tax rate: Bolthole Index county data
  32. Median property tax bill: Bolthole Index county data
  33. Typical home insurance premium: Bolthole Index county data

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.

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Compared with neighboring counties

Unlike 4 of its 6 neighbors, Hays County requires a building permit only in limited cases.

RuleHays CountyTravis CountyComal CountyBlanco CountyCaldwell CountyGuadalupe CountyBastrop County
Building permitLimitedLimitedNot requiredLimitedRequiredNot requiredNot required
County zoningNoNoNoNoNoNoNo
Septic permitsCounty Development ServicesCounty TNRCounty Env. HealthCounty OSSF ProgramCounty SanitationCounty Env. Health Dept.County Development Services

County locator

Hays County in Texas

46
County map
Hays County highlighted among the Texas counties · colored by Index score

How Hays County scores

Seclusion17100% ev.
Self-Sufficiency5196% ev.
Admin Boringness7490% ev.
Durability47100% ev.
Property Autonomy71100% ev.
Carry Cost51100% 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 →

$373kTypical home
1.7%Property tax
$11,177Land / acre
35.1"Annual rain
29.4% of yrsSevere drought
34.9 / yr (+25.9)Mid-century 100°F days
26.4 daysMid-century dry spell
2.28" (+7.3%)Mid-century 1-day rain
1.43×Wildfire change factor
100%Forward climate coverage
$2,312Home insurance / yr
2.9% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
205,163People within 30 min
6,366,426People within 2 hr
150,395Radius comparison (15 mi)
414.4People / sq mi
0.7%Federal land
87%Land at 15% slope or less
2.2%Soils rated "not limited" for septic (strict USDA rating)
7,997 acWorkable land screen
50.9%Wooded land
16.7 tonsBiomass / forest ac
68°FAvg temp

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Cities and towns in Hays 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.

Not yet researched: Village of Bear Creek · Dripping Springs · Hays · Mountain City · Niederwald · Woodcreek

Answers from the rulebook for Hays County

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

Hays County rules

  • Building permitLimited

    Commercial buildings, public buildings, places of public assembly or access, and multifamily dwellings in unincorporated Hays County; county development permits also apply to development activity.

    • A permit must be issued before regulated work begins.
    • The county fire code does not apply to single-family dwellings, duplexes, triplexes, or purely agricultural buildings where no workers are present and the public does not enter.
    • Separate development, floodplain, septic, driveway, utility, and fire permits may depend on project scope.
    “The Hays County Fire Marshal’s Office is responsible for issuing applicable building construction permits for commercial buildings, public buildings, places of public assembly or access, and multifamily dwellings located within the unincorporated areas of Hays County.”
  • Building code adoptedPartial

    Applicable commercial, public, publicly accessible, and multifamily development in unincorporated Hays County under the County Fire Marshal’s jurisdiction.

    • The county fire code does not apply to single-family dwellings, duplexes, triplexes, or purely agricultural buildings where no workers are present and the public does not enter.
    • The 2018 International Building Code is adopted by reference under Chapter 1 of the 2018 International Fire Code.
    • Adoption approved December 17, 2019; effective January 1, 2020.
    “On December 17, 2019, the Hays County Commissioners Court approved the adoption of the 2018 International Fire Code and local amendments. The adopted code became effective on January 1, 2020. The 2018 International Building Code is also adopted by reference under Chapter 1 of the 2018 International Fire Code.”
  • InspectionsLimited

    New single-family homes or duplexes constructed on vacant lots in unincorporated Hays County, and additions to existing single-family homes or duplexes when the addition increases the existing residential building's square footage or value by more than 50 percent.

    • H.B. 2833 permits counties with a population of more than 100 to adopt a resolution requiring inspections.
    • The Hays County Commissioners Court adopted regulations on September 15, 2009.
    • The inspection requirement is a minimum of three inspections.
    • Inspections occur at the foundation stage before concrete placement, at the framing and mechanical systems stage before drywall or other interior wall covering, and upon completion of construction.
    • Hays County does not perform inspections on single-family development; the builder must contact a third party to complete them.
    • The Notice of New Residential applies only to single-family house or duplex construction on a vacant lot, or qualifying additions to an existing single-family house or duplex.

    minimum inspections: >= 3 inspections · addition increase threshold: > 50 percent (Applies to the increase in square footage or value of the existing residential building.)

    “In 2009, the Texas Legislature adopted H.B. 2833, providing that Counties with a population of more than 100 may adopt a resolution opting to require that new homes constructed in unincorporated areas of the County be inspected a minimum of three (3) times. Inspections are required at the following stages: 1. Foundation State, before the placement of concrete. 2. The framing and mechanical systems stage; before covering with drywall or other interior wall covering(s). 3. Upon completion of construction. On September 15th, 2009, the Hays County Commissioners Court adopted regulations in accordance with those provisions. The Notice of New Residential applies only to single-family house or duplex construction on a vacant lot and construction of an addition to an existing single-family house or duplex, if the addition will increase the square footage or value of the existing residential building by more than 50 (50%) percent. Hays County does not perform inspections on single-family development. A builder will be required to contact a 3rd party to complete the inspections.”
  • County-wide zoningAbsent (with conditions)

    County zoning authority in Hays County, outside the San Marcos Regional Airport zoning regulations.

    • Hays County acknowledges the Texas Airport Zoning Act as implemented and adopted by the City of San Marcos for the San Marcos Regional Airport.
    • Municipal zoning and other local rules may apply within incorporated jurisdictions.
    “Outside the zoning regulations for the San Marcos Regional Airport, Hays County lacks zoning authority.”
  • Local zoningVaries (with conditions)

    Aggregate of land-use controls across Hays County, including the San Marcos Regional Airport zoning area, incorporated municipalities, and unincorporated areas.

    • The county states it lacks zoning authority outside the San Marcos Regional Airport zoning regulations.
    • Municipal zoning may apply inside incorporated jurisdictions; this claim does not attribute municipal ordinances to Hays County.
    “Hays County acknowledges the Texas Airport Zoning Act as implemented and adopted by the County Seat, the City of San Marcos, specifically for the San Marcos Regional Airport. Outside the zoning regulations for the San Marcos Regional Airport, Hays County lacks zoning authority.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 (with conditions)

    On-site sewage disposal systems in unincorporated Hays County.

    • Hays County administers Texas Health and Safety Code Chapter 366 and adopted rules for OSSF systems.
    • Centralized sewage treatment facilities are permitted by the Texas Commission on Environmental Quality.
    “Per the Texas Health and Safety Code, Chapter 366 - Hays County has general authority over the location, design, construction, installation, and proper functioning of on-site sewage disposal systems and shall administer this chapter and the rules adopted under this chapter.”
  • Septic permitRequired

    All OSSF systems in unincorporated Hays County, including new, replacement, and altered systems.

    • A permit is required regardless of lot size or acreage.
    • A permit will not be issued for an OSSF on land violating Hays County Development (Subdivision) Regulations.
    • Residential, institutional, and commercial structures must connect to a permitted OSSF or a centralized sewage treatment facility permitted by TCEQ.
    • Aerobic or advanced treatment systems require ongoing maintenance in Hays County.
    “A permit will be required for all On-Site Sewage Facilities, regardless of the size of the lot or acreage onto which it is installed. A permit will not be issued for an On-Site Sewage Facility that is on a tract of land found to be in violation of the Hays County Development (Subdivision) Regulations.”
  • Off-grid sanitationLimited

    Off-grid sewage sanitation for residential, institutional, and commercial structures in unincorporated Hays County.

    • Off-grid sanitation must use an OSSF permitted by Hays County or, alternatively, a centralized sewage treatment facility permitted by TCEQ.
    • All OSSF systems require permits regardless of lot size or acreage.
    “Any structure or property used for residential, institutional, or commercial purposes shall be connected to an On-Site Sewage Facility permitted by the Department or a centralized sewage treatment facility permitted by the Texas Commission on Environmental Quality.”
  • Mandatory utility hookupConditional

    Residential, institutional, and commercial structures in unincorporated Hays County.

    • The structure or property must connect to either an OSSF permitted by the county or a centralized sewage treatment facility permitted by TCEQ.
    • The rule concerns sewage connection; it does not establish a universal county water-connection requirement.
    “Any structure or property used for residential, institutional, or commercial purposes shall be connected to an On-Site Sewage Facility permitted by the Department or a centralized sewage treatment facility permitted by the Texas Commission on Environmental Quality.”
  • Agricultural exemptionConditional

    Purely agricultural buildings in unincorporated Hays County where no workers are present and the public does not enter.

    • The exemption is limited to purely agricultural buildings.
    • No workers may be present and the public may not enter.
    • Other permits or regulations, including development, floodplain, septic, driveway, or utility requirements, may still apply.
    “The county fire code does not apply to the construction of single-family dwellings, duplexes, and triplexes, and does not apply to purely agricultural buildings where no workers are present and where the public does not enter.”
  • Subdividing landRegulated (with conditions)

    Land subdivision and platting in Hays County, subject to municipal boundaries, ETJ, and statutory exceptions.

    • The county development process includes plat applications and subdivision construction plans.
    • A project’s process may differ depending on scope and geographic location.
    • Texas Local Government Code Chapter 232 and possible statutory exceptions apply.
    • Properties entirely within a municipality are not required to obtain county platting approval, according to the county FAQ.
    “The Development and Planning Division of Hays County Development Services oversees the entire development process, including plat reviews, property compliance, and land subdivisions.”
  • Driveway accessRequired

    Development projects requiring access through Hays County transportation jurisdiction or county right-of-way.

    • A driveway permit is listed among permits most development projects may be required to obtain, depending on project scope.
    • Applications are submitted electronically through the county portal.
    • Utility work in the county right-of-way has a separate fee requirement.
    “The Hays County Development Services Dept., Hays County Transportation Dept., and Hays County Fire Marshal's Office each have their own set of permit requirements depending on the scope of the project. Below are a few permits most development projects will be required to obtain from their respective project. Other approvals / permits may be required.”
  • Building in a floodplainRequired

    Development activity in Hays County, including activity inside or outside mapped floodplains.

    • Development includes land modification such as buildings, roadways, parking lots, stormwater facilities, impervious surfaces, houses, pools, sheds, slabs, fill, and clearing.
    • For property inside city limits, the applicable city floodplain administrator may handle floodplain matters.
    “All development (inside or outside of the floodplain) requires a permit from Hays County. Development is defined as All land modification activity, including but not limited to, construction of buildings, roadways, paved storage areas, parking lots, storm water management facilities and other impervious structures or surfaces (i.e. house, swimming pool, shed, slab / foundation, fill, clearing, etc.).”
  • Permit feesPublished (with conditions)

    Hays County Development Services fees and applicable permit fees.

    • The county lists a Development Services Fee Schedule effective January 2026.
    • Different departments and permit types may have separate fee schedules.
    • The Fire Marshal fee schedule was adopted December 5, 2023 and implemented February 1, 2024.
    “Development Services Fee Schedule (Effective January 2026) (PDF)”
  • Permit processPublished (with conditions)

    County development, planning, subdivision, OSSF, transportation, and Fire Marshal permitting processes.

    • Applications are submitted through MyGovernmentOnline for Hays County.
    • Applications undergo administrative and technical review.
    • Some projects may require public notice, including notice to contiguous property owners within 200 feet.
    • Process varies by project scope and geographic location.
    “All applications are accessible and can be submitted online at MyGovernmentOnline. At the time of application, fees can be settled using Certified Payments. Please utilize Bureau Code 4963827 to associate your payment with Hays County Development Services. Each application will undergo both an Administrative Review and a Technical Review. The duration of these reviews may vary depending on the type of application and the project's scope.”

Texas rules that apply here

  • Owner-builder exemptionConditional

    Owner installation of an on-site sewage facility serving a single-family dwelling in Texas, including Hays County, subject to Hays County's local permitting requirements.

    • The permitting authority must allow owner installation under its local requirements.
    • The owner must have the knowledge, skills, and equipment to perform the work.
    • The OSSF must serve a single-family dwelling that the owner owns.
    • The owner must also own the property.
    • No part of the property may be developed for sale or lease.
    • All permitting, construction, and maintenance requirements of the permitting authority must be met.
    • Some systems may be unavailable for homeowner purchase because they must be installed by a factory representative.
    • If another person assists during any phase of installation, including backhoe work or trenching, that person must be a licensed installer of the correct level.
    • Exceptions to the assistant licensing requirement are a licensed electrician installing electrical components and a person delivering a treatment or pump tank and setting the tank or tanks into an excavation.
    • Local permitting programs can be more stringent than state minimums.
    “This depends on whether the permitting authority allows this in their local requirements. Otherwise yes, provided you have the knowledge, skills, and equipment to do so AND: the OSSF is for a single family dwelling that you own, you also own the property, no part of the property will be developed for sale or lease, all permitting, construction, and maintenance requirements of the permitting authority are met. There may be some systems that a homeowner can't buy because they must be installed by a factory representative. If anyone else assists during any phase of the OSSF installation (e.g., having someone do backhoe work or trenching, etc.), the individual performing the work must be a licensed installer of the correct level, except: A licensed electrician who installs any electrical components, or A person who delivers a treatment or pump tank to a site and sets the tank(s) into an excavation.”
    2 more reviewed findings on this topic
    • Conditional — An owner performing electrical, plumbing, or air-conditioning and refrigeration work on the owner's own residence or homestead 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 as electricians.”
    • 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”
  • Septic inspectionLimited

    OSSF installation and, where applicable, maintenance inspections in Texas

    • Authorized agents or their designated representatives inspect system installation.
    • Some permitting authorities impose more stringent requirements.
    • Maintenance-provider inspection and reporting requirements apply to systems and circumstances governed by 30 TAC §285.91(4).
    • Electronic monitoring may reduce reporting to every six months where the stated monitoring conditions apply.

    reduced maintenance reporting interval with qualifying electronic monitoring: 6 months (only where the system uses the specified electronic monitoring, automatic notification, and disinfection monitoring)

    “Many times, the AA has a "designated representative" (DR) to assist them with their responsibilities, which include reviewing plans for constructing, altering, extending or repairing each OSSF; issuing permits; and inspecting system installation. [...] If the system uses an electronic monitor, automatic radio or telephone to notify the maintenance provider of system or component failure and to monitor the amount of disinfection in the system, reporting may be reduced to every six months.”
    One more reviewed finding on this topic
    • Limited — OSSFs using secondary treatment or drip irrigation in Texas.
      “A system using secondary treatment or drip irrigation must be inspected by a valid maintenance company once every four months, or be maintained by the single family homeowner, where allowed.”
  • 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.

  • Certificate of occupancy — Certificate-of-occupancy requirements in Hays County.
  • Short-term rentals — Short-term rental use in Hays 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.

Water rights & wells in Hays County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Texas’s water agency.

Actively managed

This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.

Household wellExempt up to a limit

Texas groundwater is governed by the rule of capture; a Groundwater Conservation District must exempt qualifying domestic/livestock wells and may not restrict their production, but well registration and spacing rules can still apply and the exemption does not cover wells serving a platted subdivision.

Limit: Domestic/livestock well exempt from GCD production permitting if on a tract >10 acres AND incapable of producing >25,000 gal/day (Tex. Water Code §36.117)

Texas Water Code §36.117 / TWDB ↗
  • Hill Country Priority Groundwater Management Areapartial of county

    TCEQ PGMA identifying existing or anticipated critical groundwater problems; drives GCD coverage and heightened management. Domestic/livestock wells remain exempt from GCD permits but spacing/registration may apply.

    TCEQ — Priority Groundwater Management Areas ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Texas state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Hays County, Texas

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

Hays County scores 46/100 on the Bolthole Index, a marginal county profile. Its strengths: low administrative friction for a quiet rural property and a stronger property-autonomy legal backdrop. Watch-outs: about 205,163 people within a 30-minute drive.

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

Hays County requires a building permit only in limited cases (such as floodplains or specific zones), and it has no county-wide zoning. Onsite septic is permitted by Hays County Development Services (On-Site Sewage Facilities). 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 Hays County?

Living in an RV on your own land in Hays County is allowed: Unincorporated Hays County: no county rule sets this, because Hays County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). Hays 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 Hays County, Texas?

Land in Hays County runs about $11,177 per acre, based on the latest county data.

What is the water situation in Hays County?

Hays County gets about 35.1" of rain a year, with severe drought in roughly 29.4% of years. On water rights, Hays County lies in the Hill Country Priority Groundwater Management Area — TCEQ PGMA identifying existing or anticipated critical groundwater problems; drives GCD coverage and heightened management. Domestic/livestock wells remain exempt from GCD permits but spacing/registration may apply..

How remote is Hays County?

A representative private-land location has about 205,163 people within a 30-minute drive and 6,366,426 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 Hays compares in Texas

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