King County, TX Building Permits, Zoning & Septic Rules

Unincorporated King County, Texas does not require a building permit for a home, and the county has no zoning ordinance¹². Texas gives county zoning power only in a few narrowly defined circumstances written into state law, and King County is not one of them, so there is no county rule on lot size, setbacks, RVs, tiny homes or manufactured homes here³. Septic systems still need a permit, and with no local health department, the Texas Commission on Environmental Quality's regional office is the permitting authority⁴.

At a glance

Building permit: Not required in unincorporated King County¹
Zoning: None; the county has no zoning ordinance or planning department²
Septic permit: Required; TCEQ's regional office is the permitting authority⁴⁵
RV / tiny home living: Unrestricted; no zoning ordinance governs it³
Minimum lot size / setbacks: None set by the county³
Owner-builder exemption: Not applicable; there is no county building-permit program to exempt from⁶
Driveway onto a state highway: Needs a TxDOT Form 1058 permit before construction⁷

Who to call

Also useful

King County Judge

County administration; the office to start with for questions unincorporated King County's website does not otherwise answer, such as floodplain status, road access, or whether any county rule has changed

806.596.4411

P.O. Box 127, Guthrie, Texas 79236

Also useful

King County Clerk

Records deeds, plats and other real-property documents for land in King County

806.596.4412

800 South Baker, P.O. Box 135, Guthrie, Texas 79236

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

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

Unincorporated King County, Texas does not require a building permit for a house, barn, shed or other residential structure¹. King County's official department directory lists no building, planning or inspections department, and Texas law gives a general-law county like King no authority to require one for ordinary single-family construction¹. The one exception is industrialized housing: manufactured and modular buildings sold in Texas must meet a set of state code editions that took effect in 2024, administered by the Texas Department of Licensing and Regulation, not the county⁸. Someone installing their own industrialized home who is not a registered industrialized builder can file a $75 state installation permit instead, and the first installation still gets a state site inspection with foundation, set and final phases⁹¹⁰. Site-built, stick-built construction on your own unincorporated King County land is not covered by any of this: the county issues no permit and inspects nothing¹.

Who handles county business in King County, and how do you reach them?

King County has no building, planning, zoning or floodplain department, so most land-use questions in unincorporated King County go to two elected offices instead¹¹¹². The King County Judge is the county's chief administrator and the person to start with for anything the county's own website does not otherwise answer, such as floodplain status or road access; the office's mailing address is P.O. Box 127, Guthrie, Texas 79236¹¹. The King County Clerk's office records deeds, plats and other real-property documents for land in the county, at 800 South Baker in Guthrie, Texas¹². Neither office publishes a building-permit process, because King County does not run one¹.

Does King County have zoning?

King County has no zoning ordinance and no zoning or planning department listed on its official website². Texas gives county zoning power only in specific, narrowly defined circumstances written into state law, and King County does not fall into any of them, so the default rule for a general-law county without zoning applies here³¹³. That means King County sets no minimum lot size, no setbacks, no building-height limit and no lot-coverage rule for unincorporated land³. The same lack of zoning power means King County places no restriction on manufactured homes, accessory dwellings, or where you park an RV³. Confirm nothing has changed with the King County Judge's office directly before you build, since the county publishes no ordinance either way¹¹.

How do septic permits work in King County, Texas?

Every onsite sewage facility (OSSF) in Texas needs a permit before you build, alter, extend or repair it⁵. King County has no local health department or authorized agent listed for OSSF permitting, so the Texas Commission on Environmental Quality's regional office is the default permitting authority here⁴¹⁴. A statewide exception exists for tracts of 10 acres or more: if a licensed site evaluator or engineer signs off, the home is the only dwelling on the tract, every part of the system sits at least 100 feet from the property line, and effluent stays on the property, TCEQ does not require a permit at all⁵. Large-acreage buyers in King County, where farmland has recently valued around $1,130 an acre, should ask whether their tract and plan qualify for that exemption before assuming a permit is mandatory¹⁵⁵. Soils matter too: only about 18.5% of King County's land is rated free of severe limits for a conventional septic drain field, so plan on a site evaluation and possibly an engineered or alternative system rather than assuming a standard drain field will pass¹⁶.

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

Yes: King County has no zoning ordinance restricting RV or tiny-home occupancy on private land³. That answer follows from King County's lack of zoning power, not from a state rule that specifically endorses RV living, so treat it as unrestricted rather than officially approved³. The county's own site does not publish an ordinance either way, so confirm nothing has changed by calling the King County Judge's office before you commit to permanent RV or tiny-home occupancy¹¹.

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

Confirm your parcel and check whether your driveway will connect to a state highway; if it does, contact the local TxDOT district office and file Form 1058 before any driveway construction begins⁷.
Because King County requires no general building permit, site-built construction needs no county sign-off, but manufactured or modular industrialized housing still needs either an industrialized-builder registration or a $75 state installation permit before the manufacturer releases the unit¹⁹.
Arrange your septic system early: contact TCEQ's regional office to confirm the OSSF permitting process for your site, and have a licensed site evaluator assess your soil, since only about 18.5% of King County's land is free of severe septic limitations⁴¹⁶.
If your tract is 10 acres or larger and will carry a single dwelling, ask TCEQ whether you qualify for the statewide 10-acre exemption before designing a system you may not need to permit⁵.
Check with the King County Judge's office about floodplain status and any road, drainage or bridge-load conditions on your parcel, since none of this is published online¹¹.
Record your deed, plat or survey with the King County Clerk once your land purchase closes¹².
Budget for water: farmland in King County has recently valued around $1,130 an acre, and roughly 43.7% of recent years have brought severe drought, so plan your water source accordingly¹⁵¹⁷.

What to check before you buy land in King County, Texas

Water, not zoning, is the main risk to underwrite in King County: annual precipitation averages just 23.5 inches, and the county has spent about 43.7% of recent years in severe drought¹⁸¹⁷. Soils are a related concern for septic: only 18.5% of the county's land is rated free of severe limits for a conventional drain field, so budget for a site evaluation and possibly an alternative system¹⁶. Terrain is not the obstacle: about 86.2% of King County is gentle land at 15% slope or less, and only about 14% is wooded, so most tracts are buildable ground once water and septic are solved¹⁹²⁰. King County is remote, about 86 miles from the nearest metro area, with a total county population of about 217 people²¹²². Confirm your driveway does not cross a state highway right-of-way without a TxDOT permit, and confirm your specific parcel's floodplain status with the King County Judge's office, since neither is published for browsing online²³¹¹.

Watch-outs

King County's lack of a building-permit or zoning process follows from its official department directory listing no such offices, not from a written ordinance published online; call the King County Judge's office to confirm nothing has changed before you build¹¹¹.
Floodplain administration in King County is not confirmed by any official source found; ask the King County Judge's office before building near a draw or creek¹¹.
TCEQ's regional office being the default OSSF authority does not mean every Texas county works this way; some counties have a local authorized agent, so confirm directly with TCEQ for your specific site before assuming which office issues your septic permit⁴¹⁴.

Sources

Written September 24, 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.

How King County scores

Seclusion91100% ev.

Self-Sufficiency1396% ev.

Admin Boringness8490% ev.

Durability21100% ev.

Property Autonomy71100% ev.

Carry Cost8094% 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 →

$54kTypical home

$1,130Land / acre

23.5"Annual rain

43.7% of yrsSevere drought

59 / yr (+32.8)Mid-century 100°F days

31.7 daysMid-century dry spell

1.81" (+6.2%)Mid-century 1-day rain

1.3×Wildfire change factor

100%Forward climate coverage

state median fallbackInsurance basis

181,587People within 2 hr

225Radius comparison (15 mi)

0.2People / sq mi

0%Federal land

86.2%Land at 15% slope or less

18.5%Septic soil without severe limits

105,266 acWorkable land screen

14%Wooded land

2.9 tonsBiomass / forest ac

63.6°FAvg temp

Answers from the rulebook for King County

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

King County rules

Zoning districts · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum dwelling size · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Minimum lot size · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Setbacks · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Lot coverage · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Building height · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Living in an RV · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Camping on your land · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Tiny homes · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Manufactured homes · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
Accessory dwellings · by state lawNo county rule
Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu.
- Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
County-wide zoningAbsent
Texas general-law counties have no zoning authority in unincorporated areas, and King County lists no zoning or planning department.
Texas Real Estate Research Center (Texas A&M) - Land-Use Restrictions in Texas ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

Building permitRequired
Industrialized housing or buildings installed in Texas when a person is responsible for installation construction and is not acting as a registered industrialized builder
- The installation permit applies to industrialized housing and buildings covered by the Texas Industrialized Housing and Buildings program.
- A person purchasing industrialized housing or buildings for their own use and assuming responsibility for all or part of the installation construction may file an installation permit in lieu of registering as an industrialized builder.
- The installation permit fee is $75 for each building containing industrialized modules or modular components.
- This state installation permit does not establish whether a separate local building permit is required in King County.
installation permit fee: 75 USD per building
“Manufacturers cannot release an industrialized house or building to a person who does not have either an industrialized builder registration or an installation permit issued by the Department.”
Installation Permit Information Packet ↗Re-checked Sep 11, 2026
Building code adoptedPartial
Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.
- The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
- The effective date is July 1, 2024.
- The International Existing Building Code applies to alterations of portable industrialized buildings.
- Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
- Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
- Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.
effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)
“July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Partial — Industrialized housing and buildings, modules, and modular components located in Texas, including those placed in King County.
  “Effective July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
  Industrialized Housing and Buildings – Adoption of New Code Editions ↗Re-checked Sep 11, 2026
InspectionsRequired
First installation of industrialized housing and permanent industrialized buildings outside a municipality or within a jurisdiction without a building inspection department, including applicable installations in unincorporated King County
- Site inspections are required for the first installation of all industrialized housing and permanent industrialized buildings.
- Exception: site inspections are not required for unoccupied industrialized buildings not open to the public, such as communication equipment shelters, that are not also classified as a hazardous occupancy by the mandatory building code.
- Inspections must be performed by a Council-approved inspector.
- The builder or installation permit holder must provide at least 48 hours’ notice.
- Minimum phases are foundation, set, and final inspection.
- The final inspection must be completed within 180 days of the start of construction, subject to a possible extension upon written request demonstrating justifiable cause.
- Final inspections require utilities to be connected and required tests performed.
- Occupancy may be permitted with outstanding items only when the items are not violations of the mandatory building codes.
inspection notice: >= 48 hours minimum · final inspection deadline: <= 180 days from start of construction (The Department may grant an extension upon written request demonstrating a justifiable cause.)
“Site inspections are required for the first installation of all industrialized housing and permanent industrialized buildings. Exception: Site inspections are not required for the installation of unoccupied industrialized buildings not open to the public, such as communication equipment shelters, that are not also classified as a hazardous occupancy by the mandatory building code.”
Building Site Inspection Program ↗Re-checked Sep 11, 2026
Who permits septicMixed
On-site sewage facilities, including septic systems, throughout Texas
- In most areas, local governments act as TCEQ-authorized agents and administer the OSSF program.
- The TCEQ regional office is the permitting authority where a local jurisdiction has not been authorized.
- Local permitting programs may be more stringent than state minimums.
“TCEQ is not often the OSSF permitting authority. [...] The TCEQ regional office will be the permitting authority in locations where a local jurisdiction has not been authorized.”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
Septic permitRequired
Construction, installation, alteration, extension, or repair of an OSSF in Texas
- A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.
- A 10-acre exemption may apply only if all listed conditions are met: site evaluation by a TCEQ-licensed site evaluator or professional engineer; single-family dwelling on at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; effluent disposed of on the property; and the single-family dwelling is the only dwelling on the tract.
- Emergency repairs listed by TCEQ do not require a permit but must be reported in writing to the permitting authority within 72 hours after repairs begin.
- Grandfathered systems may also be exempt if the stated conditions are met.
minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other TCEQ conditions must be met) · minimum OSSF distance from property line for 10-acre exemption: >= 100 feet (all parts of the OSSF) · emergency repair reporting deadline: <= 72 hours (after repairs have begun; written report to permitting authority)
“A permit is required to construct, install, alter, extend, or repair an OSSF. [...] An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
Getting a Permit for an OSSF - Such as a Septic System ↗Re-checked Sep 12, 2026
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.”
Basics for Septic Systems ↗Re-checked Sep 12, 2026
Driveway accessRequired
New or modified access driveways connecting property to a Texas state highway right of way.
- A local public agency may receive access driveway permitting authority for state highways, but TxDOT approval remains required for drainage impacts on the state highway system before local approval.
- No access driveway is permitted within a flared or widened right-of-way section at an intersection of a state highway with another highway, road, or street.
- All entrances and exits, including radii, must be confined within the permittee's property frontage.
- One-way 45-to-90-degree driveways are permitted for connections to one-way frontage roads or lane-divided highways; otherwise the driveway angle must be 75 to 90 degrees.
- ADAAG and Texas Accessibility Standards apply.
private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · driveway-to-pavement radius: >= 15 feet
“A driveway must be constructed in accordance with a fully executed driveway permit”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Limited — Construction of or changes to a driveway serving property from a state highway right-of-way in King County, Texas.
  “No construction work on the driveway shall be undertaken on the right of way until a fully executed driveway permit has been received by the applicant and the applicant has given 24-hour notification to TxDOT.”
  Access Management Manual: Permits ↗Re-checked Sep 11, 2026
Permit processPublished (with conditions)
Constructing a new driveway or revising an existing driveway on the right of way of a Texas state highway.
- The applicant should contact the local District TxDOT office.
- The applicant must submit Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way.
- The application must be for the bona fide purpose of securing or changing access to the owner's property, not parking or servicing vehicles on state highway rights of way.
- No construction may begin on the right of way until a fully executed driveway permit is received and the applicant gives TxDOT 24-hour notification.
- The driveway must comply with the executed permit and applicable regulations; TxDOT inspection must find construction satisfactory.
- Where a local public agency has permitting authority, drainage impacts on the state highway system still require TxDOT approval before local approval.
- Driveway geometrics, utilities, environmental requirements, wetlands considerations, ADAAG, TAS, and other applicable state and federal laws must be considered.
required form: Form 1058, Permit to Construct Access Driveway Facilities on Highway Right of Way · advance notification: 24 hours (Notification to TxDOT is required before construction on the right of way.) · private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · minimum driveway radius to highway pavement: >= 15 feet
“The applicant shall complete and submit to TxDOT a Form 1058”
Section 4: Driveway Permits, Design, and Materials ↗Re-checked Sep 12, 2026
county zoning authorityLimited
Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.
- Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
- For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
- Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
- The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.
Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)
“This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
Local Government Code Chapter 231, County Zoning Authority ↗Re-checked Sep 21, 2026
county building authorityLimited
Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.
- Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
- Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
- The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
- A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
- The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
- Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
- Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
- A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
- Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.
county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)
“The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
Local Government Code Chapter 233, County Regulation of Housing and Other Structures ↗Re-checked Sep 21, 2026

Still unanswered

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

Certificate of occupancy — General certificates of occupancy for ordinary construction in King County, Texas
Local zoning — Zoning within King County, including any incorporated municipality or other local authority whose zoning may apply within the county.
Off-grid sanitation — Off-grid sanitation systems on private property in King County, Texas.
Well permit — Private water-well permitting or registration in King County, including property within the Gateway Groundwater Conservation District.
Mandatory utility hookup — Connection to public water or sewer utilities in King County, Texas.

3 more unanswered

Building in a floodplain
Short-term rentals
Permit fees

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 King County, Texas

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

King County scores 37/100 on the Bolthole Index, a marginal county profile. Its strengths: deep seclusion — about 225 people within 15 miles and low administrative friction for a quiet rural property. Watch-outs: thin water margin (23.5″/yr rainfall) and elevated mid-century heat, water, rain, or wildfire exposure.

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

King County does not require a county building permit for a home in unincorporated areas, and it has no county-wide zoning. Onsite septic is permitted by Texas Commission on Environmental Quality (OSSF program) - regional office as permitting authority. 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 King County?

Living in an RV on your own land in King County is allowed: Unincorporated King County: no county rule sets this, because Texas law gives zoning power only to certain counties, and King County has no zoning ordinance. The county legal census found no county zoning ordinance, citing trerc.tamu.edu. 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 King County, Texas?

Land in King County runs about $1,130 per acre, based on the latest county data.

What is the water situation in King County?

King County gets about 23.5" of rain a year, with severe drought in roughly 43.7% of years.

How remote is King County?

A typical private-land location has about 225 people within 15 miles and 614,770 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

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

At a glance

Who to call

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

Who handles county business in King County, and how do you reach them?

Does King County have zoning?

How do septic permits work in King County, Texas?

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

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

What to check before you buy land in King County, Texas

Watch-outs

Sources

King County in Texas

How King County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for King County

King County rules

Texas rules that apply here

Still unanswered

Living off-grid in King County, Texas

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

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

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

How much does land cost in King County, Texas?

What is the water situation in King County?

How remote is King County?

How King compares in Texas