Bolthole Index

Washington County, Texas

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

52Index Score / 100
#126 of 254 in Texas

Unincorporated Washington County, Texas does not require a building or electrical permit for new construction or an addition to an existing structure, and the county has no zoning ordinance12. Septic permits come from Washington County Environmental Health, and floodplain and driveway culvert permits still apply county-issued where relevant34. Brenham and Burton have adopted their own city building codes, and Brenham also runs zoning, so check the city for parcels inside either one567.

At a glance

Building permit
Not required for new construction or additions in unincorporated Washington County18
Zoning
No county zoning in unincorporated areas; the City of Brenham has municipal zoning927
Septic permit
Required before work on any new, altered, repaired or enlarged system, regardless of acreage10
Floodplain permit
Required before development in a mapped flood hazard area; $325 single-family / $425 non-profit / $525 multi-unit fee1112
Driveway (culvert) permit
Required for a driveway fronting a county-maintained road; $625 for 20-30 ft wide, $875 for 31-40 ft wide1312
RV / tiny home / manufactured home living
Unrestricted by county zoning on unincorporated land; sanitation rules still apply2
Owner-builder
Allowed -- there is no county building permit to be exempt from1415

Who to call

Roads & driveways

Washington County Engineering and Development Services (Road and Bridge)

Driveway/culvert permits, subdivision applications, utility-right-of-way permits, and road and bridge maintenance for unincorporated Washington County

979-277-6275

wcrboffice@washingtoncountytx.gov

3650 State Highway 36 N, Brenham, TX 77833-3753

Septic permits

Washington County Environmental Health (Engineering and Development Services)

Septic (OSSF) and floodplain development permits for Washington County

979-277-6290

3650 Highway 36 North, Brenham, Texas 77833

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

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

Unincorporated Washington County does not require a building or electrical permit for new construction or an addition to an existing structure1. That does not clear every permit: a floodplain permit, an OSSF (septic) permit, a driveway culvert permit, a utility-right-of-way permit, and a subdivision application or variance letter can each still apply depending on the project8. City limits change the answer. Brenham follows the 2021 International Building Code suite and the 2020 National Electrical Code, effective October 1, 20245. Burton adopted the 2015 International Building Code and International Residential Code, although its ordinance deletes city permit and inspection provisions and puts compliance on the builder6. Confirm the parcel's jurisdiction before relying on the unincorporated-county permit exemption.

Because the county requires no building permit on unincorporated land, an owner can build their own home without an owner-builder exemption, though state licensing for electrical, plumbing and HVAC work may still apply14.

Who handles building, driveway and floodplain permits in Washington County?

Washington County Engineering and Development Services issues driveway (culvert) permits, subdivision applications and utility-right-of-way permits, and its Road and Bridge division maintains county roads and bridges16. Reach that office at 979-277-6275, 3650 State Highway 36 N, Brenham, TX 77833-3753, or by email at wcrboffice@washingtoncountytx.gov16. Washington County Environmental Health, a division of the same department, administers floodplain permits and septic (OSSF) permits and can be reached at 979-277-6290, 3650 Highway 36 North, Brenham, Texas 77833173. Both offices share the same Highway 36 North complex in Brenham but handle different permits, so match your project to the right one before you call1617. The county's published fee schedule lists a floodplain determination permit at $325.00 for single-family residential use and residential driveway permits at $625.00 for 20 to 30 feet wide and $875.00 for 31 to 40 feet wide12.

Does Washington County have zoning?

Unincorporated Washington County has no county zoning ordinance, because Texas law gives zoning authority only to municipalities, not counties, outside a short list of specific, narrowly defined places elsewhere in the state92. The City of Brenham is different: its Planning office handles zoning issues within the city7. Burton's building-code ordinance also sets a 750-square-foot minimum heated area for a residence, with smaller proposals subject to City Council consideration6. On unincorporated land, the county sets no zoning-based minimum lot size, setback, lot-coverage, building-height or minimum-home-size rule2. Subdividing land remains regulated separately: dividing a tract into two or more parts outside an incorporated city requires an approved plat or a variance letter18.

How do septic and floodplain permits work in Washington County?

Washington County Environmental Health administers on-site sewage facility (septic) permitting throughout the county, except in an area already regulated under another order, ordinance or resolution3. Every new, altered, repaired or enlarged system needs a permit before work begins, regardless of acreage; routine maintenance such as tank pumping does not10. All septic construction must pass a county inspection before it is covered, with the inspection scheduled at least 24 hours ahead19. After installation, systems using secondary treatment or drip irrigation need regular inspections by a valid maintenance company on the permitting authority's schedule; we could not confirm that every conventional system needs periodic inspection20. Only about 5.3% of Washington County soils lack severe limitations for a conventional drain field, so arrange a site evaluation before committing to a house site21. Floodplain development separately requires county authorization before work begins11.

Can you live in an RV, tiny home or manufactured home on your land in Washington County?

On unincorporated land, RV, tiny-home and manufactured-home occupancy are unrestricted by Washington County zoning because the county has no zoning authority2. That zoning answer does not waive wastewater rules. A new, altered, repaired or enlarged septic system requires a permit before work begins regardless of acreage10. Sewage holding tanks must meet state standards and cannot serve a property with more than one dwelling, RV or similar sewage-producing structure; the restriction does not apply to an RV using only its factory-installed integrated wastewater tank22. Washington County's order does not confirm the rules for composting toilets or graywater, so ask Environmental Health before choosing either arrangement17. Inside Brenham, city zoning and adopted building codes apply instead of the unincorporated-county answer75.

Building on land in Washington County: the steps, in order

  1. Confirm your parcel's jurisdiction; the county permit exemption applies to unincorporated land, while Brenham and Burton have adopted building codes856.
  2. Check the flood map and obtain written authorization from Washington County Environmental Health before beginning floodplain development1711.
  3. Apply through Environmental Health before installing, altering, repairing or enlarging an OSSF, regardless of acreage; schedule its construction inspection at least 24 hours ahead171019.
  4. If the driveway fronts a county-maintained road, obtain a culvert permit from Engineering and Development Services1613.
  5. If you are dividing a tract into two or more parts outside a city, submit a plat or variance letter unless the agricultural, ranching, wildlife-management or timber-production exemption applies1823.
  6. On unincorporated land, no county zoning review sets minimum home size, setbacks, lot coverage or building height2.

What to check before you buy land in Washington County

Washington County averages 43.7 inches of rain a year and has spent roughly 20.5% of years in severe drought, more rain than most of Texas but still worth confirming your water source2425. Only about 5.3% of the county's soils are free of severe limitations for a conventional septic drain field, even though all of the county's land sits at 15% slope or less, so flat ground here does not guarantee an easy septic site2126. Federal land covers only 2.6% of the county, so nearly all of Washington County is private27. The county's effective property tax rate is about 1.1%, with a median property tax bill of $3,105 a year2829. From the county's center, the nearest city of 100,000 or more is roughly 27 miles away, and Washington County has 61.3 people per square mile3031. If you plan a short-term rental outside city limits, Washington County charges a 7% Hotel Occupancy Tax that includes short-term rentals, collected quarterly32.

Watch-outs

  • Washington County requires no general building permit, but skipping the floodplain, septic or driveway culvert permit is still a real risk -- each is enforced separately from the building-permit exemption8.
  • The no-permit and no-zoning answers apply to unincorporated Washington County; Brenham and Burton have adopted municipal building codes, and Brenham also administers zoning2567.
  • We could not confirm whether a building inspection, certificate of occupancy or water-well permit applies in unincorporated Washington County; ask Engineering and Development Services or Environmental Health directly1617.
  • Washington County Environmental Health and Engineering and Development Services share the same Highway 36 North complex in Brenham but use different phone lines -- call the septic/floodplain line for septic and floodplain questions, and the road/driveway line for culvert and subdivision questions1716.

Sources

  1. Washington County Engineering and Development Services (2026 county census)
  2. Texas law on county zoning and building authority
  3. Washington County Environmental Health, quoted and re-checked
  4. Washington County Environmental Health, quoted and re-checked
  5. Development Services - City of Brenham, Texas, quoted and re-checked
  6. Ordinance No. 20180813B, quoted and re-checked
  7. Planning - City of Brenham, Texas, quoted and re-checked
  8. Washington County Engineering and Development Services, quoted and re-checked
  9. Washington County Engineering & Development Services (2026 county census)
  10. Washington County Environmental Health, quoted and re-checked
  11. Washington County Environmental Health, quoted and re-checked
  12. Washington County Engineering and Development Services Fee Schedule, quoted and re-checked
  13. Washington County Engineering and Development Services, quoted and re-checked
  14. Texas law on county zoning and building authority
  15. Washington County Engineering and Development Services (2026 county census)
  16. Washington County Engineering and Development Services (Road and Bridge) (co.washington.tx.us)
  17. Washington County Environmental Health (Engineering and Development Services) (co.washington.tx.us)
  18. Washington County Subdivision and Development Regulations, quoted and re-checked
  19. Septic System Permitting Procedures, quoted and re-checked
  20. On-Site Sewage Facility FAQs, 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. Washington County OSSF Order, quoted and re-checked
  23. Washington County Subdivision and Development Regulations, quoted and re-checked
  24. Annual precipitation: Bolthole Index county data
  25. Share of years in severe drought: Bolthole Index county data
  26. Share of land at 15% slope or less: Bolthole Index county data
  27. Federal land share: Bolthole Index county data
  28. Effective property tax rate: Bolthole Index county data
  29. Median property tax bill: Bolthole Index county data
  30. Straight-line distance from the county center to the nearest city of 100,000+ people: Bolthole Index county data
  31. Population density: Bolthole Index county data
  32. Hotel Occupancy Tax Information, quoted and re-checked

Written October 9, 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 5 of its 6 neighbors, Washington County requires no county building permit for a home.

RuleWashington CountyBurleson CountyAustin CountyLee CountyWaller CountyBrazos CountyGrimes County
Building permitNot requiredLimitedLimitedRequiredRequiredLimitedNot required
County zoningNoNoNoNoNoNoNo
Septic permitsCounty Env. HealthCounty Env. OfficeCounty Planning & DevelopmentCounty Development ServicesCounty Env. Div.County Health Dept.County Env. Services Div.

County locator

Washington County in Texas

52
County map
Washington County highlighted among the Texas counties · colored by Index score

How Washington County scores

Seclusion26100% ev.
Self-Sufficiency39100% ev.
Admin Boringness92100% ev.
Durability47100% ev.
Property Autonomy71100% ev.
Carry Cost69100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$376kTypical home
1.1%Property tax
$4,646Land / acre
43.7"Annual rain
20.5% of yrsSevere drought
43.4 / yr (+29.3)Mid-century 100°F days
21.4 daysMid-century dry spell
2.58" (+6.7%)Mid-century 1-day rain
1.41×Wildfire change factor
100%Forward climate coverage
$2,884Home insurance / yr
3.4% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
24,172People within 30 min
10,449,378People within 2 hr
34,483Radius comparison (15 mi)
61.3People / sq mi
2.6%Federal land
100%Land at 15% slope or less
5.3%Soils rated "not limited" for septic (strict USDA rating)
17,663 acWorkable land screen
15.5%Wooded land
16.7 tonsBiomass / forest ac
68.6°FAvg temp

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Cities and towns in Washington 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: Burton

Answers from the rulebook for Washington County

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

Washington County rules

  • Building permitNot required

    New residential construction or additions to existing structures in unincorporated Washington County, Texas.

    • A floodplain permit is required for building in the floodplain.
    • An OSSF permit is required for installing, replacing, repairing, or adding to an OSSF septic tank.
    • A culvert permit is required for installing a driveway fronting a county-maintained road.
    • A utility installation permit is required for installing utilities in the county right-of-way.
    • A subdivision application or variance letter is required for subdividing a tract of land.
    • The page states only that no building or electrical permits are required; it does not eliminate other applicable permits or approvals.
    “New build or adding on to an existing structure? No, no building or electrical permits are required in unincorporated Washington County.”
  • Owner-builder exemption · follows from the permit answerNot needed

    Unincorporated Washington County: no county building permit is required, so there is no permit to be exempt from and you may build your own home. State licensing for electrical, plumbing and HVAC work may still apply.

    • A floodplain permit is required for building in the floodplain.
    • An OSSF permit is required for installing, replacing, repairing, or adding to an OSSF septic tank.
    “New build or adding on to an existing structure? No, no building or electrical permits are required in unincorporated Washington County.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum dwelling size · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum lot size · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Setbacks · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Lot coverage · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Building height · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Living in an RV · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Camping on your land · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Tiny homes · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Manufactured homes · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Accessory dwellings · by state lawNo county rule

    Unincorporated Washington County: no county rule sets this, because Washington County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). The county legal census found no county zoning ordinance, citing co.washington.tx.us.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Who permits septicCounty

    On-site sewage facility permitting throughout Washington County, Texas, subject to areas regulated under an existing order, ordinance, or resolution.

    • The 2025 county OSSF Order states that it applies to all areas within Washington County except areas regulated under an existing Order, Ordinance or Resolution.
    “SECTION 6. AREA OF JURISDICTION. This Order shall apply to all the areas lying within Washington County, Texas, except for areas regulated under an existing Order, Ordinance or Resolution.”
  • Septic permitRequired

    New, altered, repaired, or enlarged septic systems in Washington County, Texas.

    • The permit must be obtained before work begins.
    • The requirement applies regardless of acreage.
    • Routine maintenance such as tank pumping does not require a permit.
    • The permit application, site evaluation, and design must be submitted for review and approval before written Authorization to Construct is issued.
    • Current fee schedule retrieved September 23, 2026 is marked REV 2025-04: $325 for single-family residential, $425 for non-profit, and $525 for multi-unit residential or non-residential OSSF permit applications.
    • Fees are non-refundable; a credit/debit card processing fee is charged when applicable.

    single-family residential OSSF permit application fee: 325 USD (Current fee schedule marked REV 2025-04) · non-profit OSSF permit application fee: 425 USD (Current fee schedule marked REV 2025-04) · multi-unit residential or non-residential OSSF permit application fee: 525 USD (Current fee schedule marked REV 2025-04)

    “All new, altered, repaired, or enlarged septic systems require a permit before work begins, regardless of acreage. Routine maintenance such as tank pumping does not require a permit.”
    One more reviewed finding on this topic
    • Required — New, altered, repaired, or enlarged septic systems in Washington County, Texas.
      “Each new, altered, repaired, or extended OSSF shall require a permit, regardless of acreage. Permit application fees shall be non-refundable and charged in accordance with the current fee schedule adopted by Commissioners Court.”
  • Septic inspectionRequired

    Septic-system construction in Washington County, Texas.

    • All work must pass inspection before the system is covered.
    • Inspection must be scheduled at least 24 hours in advance.
    • After a successful inspection, the county issues a Notice of Approval, meaning the system passed inspection and is approved for use.
    • For aerobic systems, ongoing lifetime maintenance is required, maintenance reports are quarterly for single-family residences and monthly for commercial food establishments, and a maintenance tracking fee applies.

    minimum advance inspection scheduling notice: >= 24 hours · aerobic-system maintenance report frequency for single-family residences: per quarterly · aerobic-system maintenance report frequency for commercial food establishments: per monthly · OSSF re-inspection fee: 150 USD (Current fee schedule marked REV 2025-04)

    “All septic system construction must be inspected by a Washington County Environmental Department Inspector. All work must pass inspection before the system is covered. Call to schedule an inspection at least 24 hours in advance.”
    One more reviewed finding on this topic
    • Limited — OSSFs using secondary treatment or drip irrigation in Washington County, Texas.
      “A system using secondary treatment or drip irrigation must be inspected by a valid maintenance company regularly; per the schedule established by your permitting authority.”
  • Off-grid sanitationLimited

    Holding tanks, including portable holding tanks, used for sewage disposal in Washington County, Texas.

    • Holding tanks must meet 30 TAC § 285.34(e).
    • Holding tanks may not be used on a property with more than one dwelling unit, single-family dwelling, recreational vehicle, or similar structure that may produce sewage.
    • Holding tanks may not be used on a property with more than one commercial or institutional structure that may produce sewage under Texas Health and Safety Code § 366.002(9).
    • The holding-tank provisions do not apply to portable toilets, RVs using only OEM factory-installed integrated wastewater holding tanks, or an office trailer at a construction site.
    • The 2025 Order contains no matching text for composting or graywater; absence of those terms does not establish that those systems are unregulated.
    “Holding tanks, including portable holding tanks, shall meet the requirements of § 285.34 (e) and shall not be used on properties with more than one (1) dwelling unit, single-family dwelling, recreational vehicle (RV), or similar structure, or more than one (1) commercial or institutional structure on the subject property that may produce sewage per § 366.002(9). These holding tank provisions do not apply to portable toilets, RVs utilizing only OEM factory installed integrated wastewater holding tanks, or to an office trailer at a construction site.”
  • Agricultural exemptionAvailable (with conditions)

    Exemption from the requirement to plat a land division outside the platting jurisdiction of an incorporated town or city in Washington County when the land is used primarily for agricultural, farm, ranch, wildlife-management, or timber-production purposes.

    • The owner must divide a tract into two or more parts.
    • The owner must not intend to lay out any part of the land for streets, alleys, squares, parks, or other parts dedicated for public use.
    • The land must be used primarily for agricultural uses, or for farm, ranch, wildlife management, or timber production use.
    • The exemption does not release the subdivider from minimum lot frontage, minimum setback, or minimum lot area requirements.
    • Washington County requests, though does not require, a courtesy notification letter; a survey or sketch would be helpful.
    • If any daughter lot loses exemption status or no longer qualifies for the exemption originally used, all related landowners must plat the entirety of the parent tract.
    • The regulations state that the exemption is under Texas Local Government Code Section 232.0015(D).

    agricultural-use threshold: used primarily for agricultural, farm, ranch, wildlife management, or timber production

    “The land is used primarily for agricultural uses, or for farm, ranch, wildlife management, or timber production use.”
  • Subdividing landRegulated (with conditions)

    Subdivision of a tract into two or more parts outside the boundaries of an incorporated town or city in Washington County, Texas.

    • A plat must be prepared and submitted for approval by the Washington County Commissioners Court under Section 3.01.
    • The regulations apply to subdivisions, additions, lots, roads, alleys, squares, parks, or other parts intended for public use or for use by purchasers or owners of lots.
    • A subdivision for which the Commissioners Court received a preliminary plat before the regulations' effective date is governed by the regulations in effect when the plat was submitted.
    • Incorporated municipalities and their platting jurisdictions may have separate requirements; where no interlocal agreement exists, both the municipality and Washington County must approve development, with final approval by the County.
    • A subdivision application or variance letter is required according to the County's Engineering and Development Services page.

    minimum division size: two or more parts

    “Subdividing a tract of land? Yes, a subdivision application or variance letter is required.”
  • Driveway accessRequired

    A driveway fronting a county-maintained road in Washington County's unincorporated areas.

    • The county road page specifies a culvert permit; the cited source does not establish a county permit requirement for driveways fronting state-maintained roads.
    • Washington County's addressing page states that whether a culvert is needed depends on whether the entrance is from a county-maintained road or a state-maintained road.
    “Installing a driveway fronting a county-maintained road? Yes, a culvert permit is required.”
  • Building in a floodplainRequired

    Development or construction relating to the floodplain on property in unincorporated areas of Washington County.

    • A permit and authorization are required before floodplain-related development or construction begins.
    • The permit application, fee, and planning materials must be submitted for review and authorization before work begins.
    • Work may not begin before written authorization or an exemption.
    • If the proposed development is not located in a Special Flood Hazard Area, it is exempt from Washington County standards for development in a Special Flood Hazard Area.
    • If development exceeds 50 lots or 5 acres, whichever is less, base flood elevation data must be provided.
    • Additional state and federal permits may apply to wetlands.

    base flood elevation data threshold: more than 50 lots or 5 acres, whichever is less

    “Because Washington County participates in the National Flood Insurance Program, a permit and authorization are required before any development/construction relating to the floodplain begins.”
  • Short-term rentalsLimited

    Compliant short-term rentals outside Washington County city limits.

    • Washington County charges a 7% Hotel Occupancy Tax that includes short-term rentals.
    • The tax is collected quarterly.
    • The county handles hotel occupancy tax matters outside city limits; the city handles matters within city limits.
    • The county page states that compliant short-term rentals are registered with the Chamber of Commerce and the State of Texas.

    hotel occupancy tax: 7 percent (Includes short-term rentals; collected quarterly)

    “In 2010, Washington County elected to charge a 7 % Hotel Occupancy Tax (which includes short-term rentals). This tax is collected quarterly.”
  • Permit feesPublished (with conditions)

    County Engineering and Development Services permits, including driveway, floodplain determination, OSSF/septic, subdivision development, utility-right-of-way, and prescribed-burn permits.

    • The fee schedule lists residential driveway fees of $625.00 for 20–30 feet wide and $875.00 for 31–40 feet wide.
    • The fee schedule lists culvert extension at $50 per linear foot, commercial driveway over 40 feet wide at $150.00, and inspection with no culvert required at $50.00.
    • The fee schedule lists floodplain determination permit fees of $325.00 for single-family residential, $425.00 for non-profit, $525.00 for multi-unit/non-residential, and $75.00 for a benchmark disc.
    • The fee schedule states that a processing fee is charged to all credit/debit card payments and paid directly to Certified Payments.

    residential driveway fee, 20-30 feet wide: 625 USD · residential driveway fee, 31-40 feet wide: 875 USD · culvert extension: 50 USD per linear foot · floodplain determination permit, single-family residential: 325 USD · floodplain determination permit, non-profit: 425 USD · floodplain determination permit, multi-unit/non-residential: 525 USD

    “Floodplain Determination Permit Single-Family Residential $325.00 Non-Profit $425.00 Multi-Unit /Non-Residential $525.00 Benchmark Disc $75.00”
  • Permit processPublished (with conditions)

    County-administered floodplain, driveway, septic, utility-right-of-way, subdivision, and related permits in Washington County, with the cited floodplain rule expressly applying to unincorporated areas.

    • Washington County provides an online process for septic, floodplain, and prescribed-burn permits.
    • Floodplain applications, fees, and planning materials must be submitted for review and authorization before work begins.
    • For floodplain development, work may not begin before written authorization or exemption.
    • A driveway fronting a county-maintained road requires a culvert permit.
    • New construction or additions in unincorporated Washington County do not require county building or electrical permits, according to the county's permit FAQ.
    “To apply for Septic Permits, Floodplain Permits, and Prescribed Burn Permits, please use our new online process.”
  • County-wide zoningAbsent

    Under Texas law only municipalities, not counties, may adopt zoning; Washington County has no zoning in its unincorporated areas.

    Washington County Engineering & Development Services ↗Scouted from the county site, not yet independently re-checked

Texas rules that apply here

  • Building code adoptedPartial

    Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.

    • The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
    • The effective date is July 1, 2024.
    • The International Existing Building Code applies to alterations of portable industrialized buildings.
    • Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
    • Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
    • Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.

    effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)

    “July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
    One more reviewed finding on this topic
    • Partial — Industrialized housing and buildings, modules, and modular components built for Texas under the Industrialized Housing and Buildings program.
      “Effective July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
  • Well permitLimited

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

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

    permit application form: in writing and sworn

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

    Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.

    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    • Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
    • The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.

    Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)

    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
    One more reviewed finding on this topic
    • Limited — County zoning authority over unincorporated land in Texas, where a specific statutory grant applies.
      “As you suggest, a county has very limited and specific zoning authority, and none that may be used to regulate construction or operation of the proposed facility.”
  • county building authorityLimited

    Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.

    • Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
    • Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
    • The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
    • A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
    • The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
    • Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
    • Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
    • A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
    • Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.

    county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)

    “The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”
    One more reviewed finding on this topic
    • Limited — County fire-code adoption and building-permit authority for specified buildings in unincorporated areas of qualifying Texas counties, including multifamily residential dwellings of four or more units.
      “The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code.”

Inside cities and towns in Washington County

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

  • Building code adoptedAdopted

    Building-code adoption within the City of Burton, Washington County, Texas.

    • The International Building Code provisions control construction, alteration, repair, equipment, use and occupancy, location, maintenance, removal and demolition of buildings and structures within the city's jurisdiction.
    • A variance to the International Building Code for an existing building may be submitted to the City Council.
    • The ordinance states that all provisions requiring the city to issue a permit or perform inspections were deleted, placing the burden of compliance on the builder.
    • The ordinance also adopts a 750-square-foot minimum heated area for residential structures, subject to City Council consideration of requests below that minimum.

    International Building Code edition: 2015 edition (future amendments, editions or derivatives beginning sixty days after printing) · International Residential Code edition: 2015 edition (future amendments, editions or derivatives beginning sixty days after printing) · minimum residential heated area: >= 750 square feet (request below minimum may be submitted for City Council consideration)

    “Section 2. Adoption of Building Codes. The following building codes are hereby adopted. 1. BUILDING CODES ADOPTED a. International Building Code (IBC) Adopted.”
    2 more reviewed findings on this topic
    • Adopted — Building-code adoption within the City of Brenham, Washington County, Texas.
      “The City of Brenham, effective October 1, 2024, follows the 2021 Suite of the International Building Code and the 2020 National Electrical Code.”
    • Adopted (with conditions) — Construction regulated by the City of Brenham Development Services Department.
      “The City of Brenham, effective October 1, 2024, follows the 2021 Suite of the International Building Code and the 2020 National Electrical Code.”
  • Local zoningPresent

    Planning and zoning within the City of Brenham, Washington County, Texas.

    • The cited source addresses the City of Brenham; it does not establish zoning status in Washington County's unincorporated area or other municipalities.
    “Planning is responsible for the planning and zoning issues within the city.”
    One more reviewed finding on this topic
    • Present — Zoning within the incorporated City of Brenham, Washington County, Texas.
      “Planning is responsible for the planning and zoning issues within the city.”

Still unanswered

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

  • Inspections — Building inspections for residential construction in unincorporated Washington County, Texas.
  • Certificate of occupancy — Certificates of occupancy for residential construction in unincorporated Washington County, Texas.
  • Mandatory utility hookup — Water and sewer utility-connection requirements in Washington County, Texas.

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 Washington County, Texas

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

Washington County scores 52/100 on the Bolthole Index, a solid county profile. Its strengths: low administrative friction for a quiet rural property and a stronger property-autonomy legal backdrop. Watch-outs: sparse surroundings — about 24,172 people within a 30-minute drive and workable self-sufficiency basics (43.7″/yr rainfall).

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

Washington 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 Washington County Environmental Health. 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 Washington County?

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

How much does land cost in Washington County, Texas?

Land in Washington County runs about $4,646 per acre, based on the latest county data.

What is the water situation in Washington County?

Washington County gets about 43.7" of rain a year, with severe drought in roughly 20.5% of years.

How remote is Washington County?

A representative private-land location has about 24,172 people within a 30-minute drive and 10,449,378 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 Washington compares in Texas

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