Bolthole Index

Grimes County, Texas

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

75Index Score / 100
#31 of 254 in Texas

Unincorporated Grimes County, Texas does not require a county building permit for a new home, but the builder must file free notices when construction starts and after the final inspection1. The county has no zoning in its unincorporated area, though Navasota zones inside the city23. Septic permits come from the Grimes County Environmental Services Division, and a Floodplain Development Permit is required for all unincorporated development45.

At a glance

Building permit
No county permit for a new home; free start-of-construction and final-inspection notices are required1
Zoning
No county zoning districts in unincorporated Grimes County; municipalities may set their own rules6
Septic permits
Grimes County Environmental Services Division, the TCEQ-designated representative for the county74
Floodplain permit
Required for all development in the unincorporated county; $100 fee, issued after all other permits58
Driveway/culvert permit
County approval and county-provided culvert sizing are required before installation9
RV / tiny home living
Unrestricted under county rules, since unincorporated Grimes County has no zoning ordinance10
Minimum home size
None set by the county10
Owner-builder
Allowed; there is no county home-building permit from which to seek an exemption11

Who to call

Building permits

Grimes County Development Services

Grimes County Development Permits, plat and replat review, Notice of Construction/Notice of Inspection filings for the 2021 IRC, and commercial site review

(936) 873-6465

gcpermits@grimescountytexas.gov

270 FM 149 W., Anderson, Texas 77830

Floodplain permits

Grimes County Floodplain Administrator

Floodplain Development Permits for all unincorporated Grimes County development; the position is currently held by the County Engineer

936-873-4436

gcpermits@grimescountytexas.gov

270 FM 149 W., Anderson, Texas 77830

Septic permits

Grimes County Environmental Services Division

OSSF (septic) system permitting, installation oversight and inspection for Grimes County, acting as TCEQ's designated representative

(936) 873-4495

1170 CR 280 Annex Bldg. Suite ENV105, Anderson, TX 77830

Roads & driveways

Grimes County Road Department

Driveway/culvert permits, special road use permits and county right-of-way work, run out of the County Engineer's office

(936) 873-4436

jonathan.steiber@grimescountytexas.gov

1170 CR 280 Annex Bldg., Anderson, TX 77830

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

Off-grid gear

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

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

A new home in unincorporated Grimes County does not need a county building permit1. The builder must still file the county's Notice of Construction and Notice of Inspection forms, but those notices require no county approval or fee1. New residential construction beginning on or after December 18, 2024 must comply with the 2021 International Residential Code, although Grimes County does not inspect residential structures1213. Grimes County otherwise does not regulate building codes outside that residential compliance reporting, while municipalities may administer their own codes14. Separate county approvals still matter: all development requires a Development Permit and a Floodplain Development Permit, and septic or driveway work can trigger additional permits155169.

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

Grimes County does not operate a traditional residential building department that reviews plans and sends county inspectors; Development Services collects the required paperwork1317. A Grimes County Development Permit application must be completed by the property owner or legal representative and may be sent to gcpermits@grimescountytexas.gov or delivered to 270 FM 149 W., Anderson, Texas 7783017. The residential Notice of Construction and Notice of Inspection forms go to that same email or address17. Contact Development Services at (936) 873-6465 about development paperwork and residential notices17. The Floodplain Administrator handles the separate Floodplain Development Permit, which only the property owner or legal representative may apply for and which is approved after the project's other permits are issued1819. Development in the floodplain needs plans signed and sealed by a licensed Professional Engineer, under the Flood Damage Prevention Order approved January 21, 202619.

Does Grimes County have zoning?

Unincorporated Grimes County has no county zoning regulation or published county zoning districts202. The county still regulates flood-hazard development, subdivision plats, driveways and culverts, and work in county rights of way2. The lack of county zoning means the county sets no minimum dwelling size, minimum lot size, setbacks, lot-coverage limit or building-height limit in its unincorporated area10. It also leaves accessory dwellings, RV occupancy, tiny-home occupancy, manufactured-home occupancy and temporary camping unrestricted under county zoning rules10. City rules are different: Navasota has residential, commercial and industrial zones and processes for zoning changes, conditional uses, planned-unit developments and variances3. Confirm whether a parcel is inside a municipality or an area where municipal subdivision authority applies before relying on the county answer69.

How do septic permits work in Grimes County?

Grimes County Environmental Services permits and inspects on-site sewage facilities within the county421. A permit is generally required to construct, install, alter, extend or repair a septic system16. Only 3% of county soils lack severe limitations for a conventional drain field, so arrange the site evaluation before committing to a house location or system budget22. A narrow exemption may apply to a single dwelling on at least 10 acres when a licensed site evaluator or engineer approves the site, every system component remains at least 100 feet from the property line, effluent stays on the tract and all other conditions are met16. On newly platted subdivision lots, pit privies and portable toilets are not acceptable waste-disposal systems; qualifying private systems must follow the applicable state on-site sewage rules23. A proposed subdivision connecting to existing sewer must document the utility agreement and long-term treatment capacity24.

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

Unincorporated Grimes County has no county zoning restriction on RV occupancy, tiny-home occupancy, manufactured-home occupancy or temporary camping, and county zoning sets no minimum dwelling or lot size10. Those answers do not remove the county's development, floodplain, septic or driveway requirements155169. The county requires its Floodplain Development Permit for all development in the unincorporated area, and all other permits must be issued first5. Grimes County's published materials do not confirm a general residential certificate-of-occupancy requirement, so ask Development Services what completion documentation and utility clearances apply to the particular RV or tiny-home setup. Inside a city, municipal zoning and building rules may change the answer614.

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

  1. Confirm jurisdiction and submit the Grimes County Development Permit application through Development Services1517.
  1. Arrange the septic site evaluation early, then obtain the OSSF permit from Environmental Services unless the tract meets every condition of the state exemption221625.
  1. Before installing a county-road driveway or culvert, obtain the county permit and culvert sizing; a state-highway or farm-to-market-road connection needs TxDOT approval before county approval926.
  1. File the free Notice of Construction; it is not a building permit or county approval1.
  1. Obtain the $100 Floodplain Development Permit after every other permit has been issued58.
  1. Build to the 2021 International Residential Code, arrange the final inspection outside the county, and file the Notice of Inspection because Grimes County does not inspect the home1213.

What to check before you buy land in Grimes County

Start with septic feasibility: only 3% of Grimes County soils lack severe limitations for a conventional drain field22. Confirm legal access as well as construction cost, because a new county-road driveway or culvert needs an approved permit and county-provided sizing before installation9. Check flood maps and ask the Floodplain Administrator what engineered plans or elevation documents the site requires, since floodplain development needs plans sealed by a licensed Professional Engineer19; the county's Floodplain Development Permit applies to all development in the unincorporated area and comes last518. For a recently divided tract, verify its plat and whether subdivision wastewater rules apply; platted lots cannot use pit privies or portable toilets as their waste-disposal system23. A new well must be registered with the Bluebonnet Groundwater Conservation District before drilling, while non-exempt use also requires an operating permit27. Typical property tax is about 1.1%, with a median annual bill near $2,4802829.

Watch-outs

  • Grimes County's published permit fee schedule lists driveway/culvert permits at $25 (Type I) and $50 (Type II), but the county's own online application form shows $26 and $52 — confirm the current fee with the Road Department before paying8.
  • An owner-builder may build a home without a county building permit, but must still file the construction notices and follow applicable trade-licensing rules111.
  • The Floodplain Development Permit must be the last permit issued for a project — apply for septic, driveway/culvert, and development permits first5.

Sources

  1. Residential Construction - Frequently Asked Questions, quoted and re-checked
  2. Regarding Regulations in Grimes County, quoted and re-checked
  3. City of Navasota Development Guide, quoted and re-checked
  4. Environmental Services - Grimes County, TX, quoted and re-checked
  5. Floodplain Administrator - Grimes County, TX, quoted and re-checked
  6. Regarding Regulations in Grimes County, quoted and re-checked
  7. Environmental Services - Grimes County, TX (2026 county census)
  8. Grimes County Permits Fee Schedule, quoted and re-checked
  9. Grimes County Infrastructure Regulations, quoted and re-checked
  10. Texas law on county zoning and building authority
  11. Texas law on county zoning and building authority
  12. Development Services - Grimes County, TX, quoted and re-checked
  13. Development Services - Grimes County, TX, quoted and re-checked
  14. Regarding Regulations in Grimes County, quoted and re-checked
  15. Development Services - Grimes County, TX, quoted and re-checked
  16. Getting a Permit for an OSSF - Such as a Septic System, quoted and re-checked
  17. Grimes County Development Services (grimescountytexas.gov)
  18. Grimes County Floodplain Administrator (grimescountytexas.gov)
  19. Floodplain Administrator - Grimes County, TX, quoted and re-checked
  20. Regarding Regulations in Grimes County, quoted and re-checked
  21. Environmental Services - Grimes County, TX, quoted and re-checked
  22. 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
  23. Grimes County Subdivision Rules and Regulations, quoted and re-checked
  24. Grimes County Subdivision Rules and Regulations, quoted and re-checked
  25. Grimes County Environmental Services Division (grimescountytexas.gov)
  26. Grimes County Road Department (grimescountytexas.gov)
  27. Applications - Bluebonnet Groundwater Conservation District, quoted and re-checked
  28. Effective property tax rate: Bolthole Index county data
  29. Median property tax bill: Bolthole Index county data

Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

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

RuleGrimes CountyBrazos CountyWalker CountyMadison CountyMontgomery CountyWashington CountyWaller County
Building permitNot requiredLimitedNot requiredNot requiredLimitedNot requiredRequired
County zoningNoNoNoNoNoNoNo
Septic permitsCounty Env. Services Div.County Health Dept.County On-Site WastewaterMadison CountyCounty Env. Health ServicesCounty Env. HealthCounty Env. Div.

County locator

Grimes County in Texas

75
County map
Grimes County highlighted among the Texas counties · colored by Index score

How Grimes County scores

Seclusion53100% ev.
Self-Sufficiency59100% ev.
Admin Boringness8490% ev.
Durability54100% ev.
Property Autonomy71100% ev.
Carry Cost74100% ev.

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

$358kTypical home
1.1%Property tax
$3,448Land / acre
45.2"Annual rain
16.2% of yrsSevere drought
35.1 / yr (+25.8)Mid-century 100°F days
20.8 daysMid-century dry spell
2.6" (+7.6%)Mid-century 1-day rain
1.41×Wildfire change factor
100%Forward climate coverage
$2,190Home insurance / yr
-0.5% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
7,644People within 30 min
5,877,073People within 2 hr
35,725Radius comparison (15 mi)
41.1People / sq mi
0%Federal land
100%Land at 15% slope or less
3%Soils rated "not limited" for septic (strict USDA rating)
14,704 acWorkable land screen
30.3%Wooded land
24.6 tonsBiomass / forest ac
68.2°FAvg temp

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Cities and towns in Grimes 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: Anderson · Bedias · Iola · Plantersville · Todd Mission

Answers from the rulebook for Grimes County

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

Grimes County rules

  • Building permitLimited

    Development, including buildings or other structures, in all unincorporated areas of Grimes County that is located in the floodplain.

    • A floodplain development permit is required for all development in all unincorporated areas of Grimes County.
    • Only the property owner or legal representative may apply.
    • All other permits must be issued before the floodplain development permit is approved.
    • Development in the floodplain requires plans signed and sealed by a licensed Professional Engineer.
    • The Flood Damage Prevention Order was approved January 21, 2026.
    “A FLOODPLAIN DEVELOPMENT PERMIT IS REQUIRED FOR ALL DEVELOPMENT IN ALL UNINCORPORATED AREAS OF GRIMES COUNTY. ONLY THE PROPERTY OWNER OR THEIR LEGAL REPRESENTATIVE MAY APPLY FOR A PERMIT. ALL OTHER PERMITS MUST BE ISSUED BEFORE THE FLOODPLAIN DEVELOPMENT PERMIT IS APPROVED.”
    One more reviewed finding on this topic
    • Not required — Building a new home in unincorporated Grimes County, subject to separate development, floodplain, septic, driveway, road-use, and other applicable requirements.
      “A permit is not required. The builder must provide notice of the start of construction and the date of final inspection using the County’s forms, but this is not a permit requiring Grimes County approval and there is no fee.”
  • Owner-builder exemption · follows from the permit answerNot needed

    Unincorporated Grimes 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.

    • The builder must provide notice of the start of construction and the date of final inspection using Grimes County forms.
    • The notice is not a permit requiring Grimes County approval and there is no fee.
    “A permit is not required. The builder must provide notice of the start of construction and the date of final inspection using the County’s forms, but this is not a permit requiring Grimes County approval and there is no fee.”
  • Building code adoptedPartial

    Building-code adoption across Grimes County as an aggregate jurisdiction.

    • Grimes County adopted IRC 2021 for new residential construction in unincorporated areas beginning December 18, 2024.
    • The county source states that the county does not regulate building codes except for reporting compliance with IRC 2021 for residential structures.
    • Municipalities may adopt and administer their own building codes; the City of Navasota guide lists multiple adopted construction codes.
    “Grimes County DOES NOT regulate the following: - Building codes (except for reporting compliance with IRC 2021 for residential structures)”
    One more reviewed finding on this topic
    • Adopted (with conditions) — New residential construction in unincorporated Grimes County.
      “The Grimes County Commissioners Court adopted International Residential Code version 2021 on December 18th, 2024, pursuant to Texas Local Government Code 233 Subchapter F. The code applies to all new residential construction in unincorporated Grimes County starting on or after this date.”
  • InspectionsNot required

    Residential structures subject to Grimes County’s residential construction and inspection information in unincorporated Grimes County.

    • A builder must still provide Notice of Construction and Notice of Inspection to Grimes County.
    • The county’s page states that the 2021 International Residential Code applies to all new residential construction in unincorporated Grimes County starting on or after December 18, 2024.
    • This claim concerns county inspection of residential structures and does not negate inspections required by other authorities or for other development types.
    “Grimes County does not inspect residential structures.”
  • County-wide zoningAbsent

    Zoning regulation in the unincorporated area of Grimes County.

    • The source addresses the Grimes County unincorporated area; incorporated municipalities may administer their own zoning rules.
    “There is no zoning regulation in the Grimes County unincorporated area.”
  • Local zoningAbsent

    County zoning regulation in the unincorporated area of Grimes County.

    • The source expressly addresses the Grimes County unincorporated area.
    • The county separately regulates development in the Special Flood Hazard Area, subdivision plat applications, driveway and culvert installation on County Roads, residential-code construction and inspection notices, utilities in the right of way, work in the county right of way, and high-speed rail facilities crossing County Road right of way.
    • The source directs readers to the Grimes County Road and Bridge Department, Environmental Department, and/or Floodplain Administrator websites for those regulations.
    “There is no zoning regulation in the Grimes County unincorporated area.”
  • Zoning districtsNot published

    County zoning districts in unincorporated Grimes County.

    • This conclusion is limited to unincorporated Grimes County; incorporated municipalities may adopt and administer their own zoning regulations.
    “There is no zoning regulation in the Grimes County unincorporated area.”
  • Minimum dwelling size · by state lawNo county rule

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    On-site sewage facilities (septic systems) within Grimes County boundaries.

    • The County Environmental Services Division's authority is limited specifically to septic-system oversight and trash dumped in the County right of way.
    • Systems are to comply with state regulations.
    “overseeing the installation, permitting, and inspection of on-site sewage facilities (septic systems) within county boundaries.”
  • Septic inspectionLimited

    On-site sewage facilities (septic systems) within Grimes County boundaries.

    • County Environmental Services oversees inspection as part of its septic-system oversight.
    • The stated purpose is compliance with state regulations to prevent wastewater contamination of soil and groundwater.
    “inspection of on-site sewage facilities (septic systems) within county boundaries.”
  • Off-grid sanitationLimited

    Private on-site sewage facilities proposed for lots platted under Grimes County's subdivision rules.

    • On-site facilities serving single-family or multi-family dwellings with anticipated wastewater generation no greater than 5,000 gallons per day must comply with 30 TAC Chapter 285.
    • Sewerage-facility proposals disposing of 5,000 gallons per day or more must comply with 30 TAC Chapter 317.
    • The commission or its authorized agent reviews proposals and makes inspections as necessary to assure compliance with Texas Health and Safety Code Chapter 366 and 30 TAC Chapter 285, particularly §§ 285.4, 285.5, and 285.30-285.39.
    • Pit privies and portable toilets are not acceptable waste-disposal systems for lots platted under these rules.

    on-site residential wastewater-generation threshold: <= 5000 gallons per day (At or below this amount, the cited rule requires compliance with 30 TAC Chapter 285; proposals at 5,000 gallons per day or greater must comply with 30 TAC Chapter 317.)

    “pit privies and portable toilets are not acceptable waste disposal systems”
  • Well permitLimited

    Water wells in Grimes County within the Bluebonnet Groundwater Conservation District.

    • All wells in the district must be registered with Bluebonnet GCD.
    • An operating permit is required for every non-exempt well.
    • Domestic single-tract, agricultural, monitoring, qualifying Railroad Commission drilling or mining, and other listed exempt wells may operate after registration without an operating permit, subject to the district's rules.
    • For a new exempt well, the registration form must be filed before drilling work begins and drilling may not begin until the district issues a Well Development Authorization.
    • A change from exempt to non-exempt use requires operating permits before the water's use is changed.

    new exempt well log deposit: 100 USD (The deposit must accompany the Well Development Application; all or part is refunded if drilling documentation, including drillers logs, is submitted within 60 days after well completion.) · well-documentation submission period for stated deposit refund: <= 60 days (Measured after completion of the well.)

    “Operating Permit – Required for all Non-Exempt Wells.”
  • Mandatory utility hookupSewer (with conditions)

    A proposed unincorporated Grimes County subdivision that will dispose of wastewater by connecting to an existing permitted facility.

    • The subdivider must provide a written statement agreement with the retail public utility in substantially the form in Appendix 1B.
    • The agreement must establish that the utility has or will have capacity to treat total anticipated flow from ultimate development and occupancy for at least 30 years.
    • The agreement must reflect that all connection fees have been paid so service is available to every lot upon completion of the wastewater facilities described on the final plat.
    • Proposed wastewater collection-line engineering plans must comply with 30 TAC Chapter 317.

    required utility treatment-capacity period: >= 30 years (For total anticipated flow from ultimate development and occupancy of the proposed subdivision.)

    “must provide a written statement agreement [...] with the retail public utility.”
  • Driveway accessRequired

    Installation of a driveway and/or culvert in the unincorporated area of Grimes County under the Grimes County Infrastructure Regulations.

    • An approved permit and Grimes County-provided culvert sizing are required before installation.
    • The County Engineer confirms culvert diameter and length within 7 to 30 days of application, as soon as reasonably possible.
    • Minimum driveway culvert length is 24 feet.
    • Minimum driveway culvert diameter is 18 inches unless approved otherwise by the County Engineer.
    • Driveway dimensions must meet Grimes County driveway specifications.
    • Driveways on state highways or farm-to-market roads require TxDOT approval before seeking Grimes County approval.
    • Rear and side driveway access to roads abutting a lot is not allowed and denial of access must be noted on the plat.
    • Minimum spacing is 100 feet for arterial/thoroughfare roads, 80 feet for collector roads, and 60 feet for local roads, measured center-to-center; the County Engineer may increase or decrease spacing after review of specified site factors.
    • Multiple driveways on the same property must be separated by at least 20 feet, and each driveway requires a separate permit.
    • The portion within an existing County right-of-way must use material equivalent or superior to the existing roadway material.
    • The County may impose access-control requirements for public safety.
    • The posted permit form lists Type 1 fee $26 and Type 2 fee $52 following notice of violation, while the July 2, 2025 fee schedule lists Type I $25 and Type II $50; the authoritative current fee amount requires resolution.
    • The Infrastructure Regulations state that municipal subdivision rules control in a municipality's ETJ when the municipality and County have agreed; Grimes County specifically identifies an agreement allowing the City of Navasota to regulate subdivision developments within its ETJ.

    culvert minimum length: >= 24 ft · culvert minimum diameter: >= 18 in (unless approved by the County Engineer) · arterial/thoroughfare driveway spacing: >= 100 ft (may be increased or decreased by the County Engineer) · collector driveway spacing: >= 80 ft (may be increased or decreased by the County Engineer) · local driveway spacing: >= 60 ft (may be increased or decreased by the County Engineer) · multiple driveway separation: >= 20 ft (separate permit required for each driveway)

    “Driveway Culverts - a driveway and/or culvert may not be installed without an approved permit and culvert sizing provided by Grimes County.”
  • Building in a floodplainRequired

    All development in all unincorporated areas of Grimes County, including man-made changes to improved or unimproved real estate.

    • Only the property owner or the owner's legal representative may apply.
    • All other permits must be issued before approval of the floodplain development permit.
    • Applications may be submitted by email or in person at 270 FM 149 W., Anderson, Texas 77830.
    • Development in the floodplain requires plans signed and sealed by a licensed Professional Engineer.
    • Structures in the floodplain require an Elevation Certificate completed by a Registered Professional Land Surveyor.

    floodplain development permit fee: 100 USD

    “A FLOODPLAIN DEVELOPMENT PERMIT IS REQUIRED FOR ALL DEVELOPMENT IN ALL UNINCORPORATED AREAS OF GRIMES COUNTY. ONLY THE PROPERTY OWNER OR THEIR LEGAL REPRESENTATIVE MAY APPLY FOR A PERMIT. ALL OTHER PERMITS MUST BE ISSUED BEFORE THE FLOODPLAIN DEVELOPMENT PERMIT IS APPROVED.”
  • Permit feesPublished (with conditions)

    Published Grimes County fees for floodplain development permits and driveway/culvert permits in unincorporated Grimes County.

    • The fee schedule states that floodplain determinations have no cost.
    • The fee schedule lists Type II driveway/culvert permits as following a notice of violation.
    • The separately posted driveway/culvert application shows $26 Type I and $52 Type II fees, whereas the fee schedule shows $25 and $50; the county should be consulted to resolve this discrepancy before payment.

    floodplain development permit fee: 100 USD · driveway/culvert permit Type I fee: 25 USD (Includes permit and inspection.) · driveway/culvert permit Type II fee: 50 USD (Includes permit and inspection following notice of violation.)

    “Floodplain Development Permit Fee: $100 [...] Driveway/Culvert Permit Type I: $25 includes permit and inspection. Type II $50 includes permit and inspection following notice of violation”
  • Permit processPublished (with conditions)

    Development permitting for all properties in unincorporated Grimes County.

    • The development permit application must be completed by the property owner or the owner's legal representative.
    • The county provides email and in-person submission methods.
    • Requirements may include separate floodplain, subdivision, roadway, or other approvals depending on the development.
    “A Grimes County Development Permit is required for all development. This application must be completed by the property owner or their legal representative.”

Texas rules that apply here

  • Septic permitRequired

    Construction, installation, alteration, extension, repair, and operation of OSSFs in Texas, subject to stated exemptions and local requirements.

    • A permit and approved plan are required for construction, alteration, repair, extension, and operation of an OSSF.
    • A permit is generally required to construct, install, alter, extend, or repair an OSSF.
    • A local permitting authority must be checked because local programs may be more stringent than state minimums.
    • The 10-acre exemption requires compliance with 30 TAC Chapter 285 planning, construction, and installation standards; a site evaluation by a TCEQ-licensed site evaluator or professional engineer; service to a single-family dwelling on a tract of at least 10 acres; no nuisance or groundwater pollution; all OSSF parts at least 100 feet from the property line; on-site effluent disposal; and the single-family dwelling must be the only dwelling on the tract.
    • Emergency repairs listed by TCEQ do not require a permit but must be reported to the permitting authority in writing within 72 hours after repairs begin.
    • Grandfathered systems may be exempt if installed before the local program was authorized or before September 1, 1989, whichever is earlier, and if they are not creating a nuisance, are not in need of repair, and have had no significant increase in use or other alteration.
    • The permitting authority must approve or deny planning materials and the permit application within 30 days of receipt.

    minimum tract size for 10-acre exemption: >= 10 acres (single-family dwelling and all other stated conditions must be met) · minimum OSSF setback under 10-acre exemption: >= 100 feet from property line (all parts of the OSSF) · emergency repair reporting deadline: <= 72 hours (after repairs have begun) · permit application decision deadline: <= 30 days (from receipt by permitting authority)

    “A permit and approved plan are required to construct, alter, repair, extend, and operate an OSSF.”
    2 more reviewed findings on this topic
    • Required — Construction, installation, alteration, extension, or repair of an on-site sewage facility in Grimes County.
      “A permit is required to construct, install, alter, extend, or repair an OSSF.”
    • Required — Construction, installation, alteration, extension, or repair of an OSSF in Texas
      “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”:”
  • 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 Grimes County

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

  • Local zoningPresent (with conditions)

    Zoning within the City of Navasota, an incorporated municipality in Grimes County.

    • The Navasota Development Guide lists zoning districts and zoning change, specific/conditional use, PUD, and variance processes.
    “Zoning change/amendment process Specific/Conditional use process Zoning PUD process Zoning variance process [...] Residential Zones. [...] Commercial Zones [...] Industrial Zones”

Still unanswered

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

  • Certificate of occupancy — Certificates of occupancy for private construction and development in Grimes County.
  • Short-term rentals — Short-term rental use of private property in unincorporated Grimes County.

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

Living off-grid in Grimes County, Texas

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

Grimes County scores 75/100 on the Bolthole Index, a strong county profile. Its strengths: low administrative friction for a quiet rural property and manageable long-term carry cost.

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

Grimes 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 Grimes County Environmental Services Division (TCEQ authorized agent; Designated Representative). 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 Grimes County?

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

How much does land cost in Grimes County, Texas?

Land in Grimes County runs about $3,448 per acre, based on the latest county data.

What is the water situation in Grimes County?

Grimes County gets about 45.2" of rain a year, with severe drought in roughly 16.2% of years.

How remote is Grimes County?

A representative private-land location has about 7,644 people within a 30-minute drive and 5,877,073 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 Grimes compares in Texas

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