Unincorporated Gonzales County, Texas has no county building permit and no zoning ordinance for unincorporated land, according to the county's own zoning and permitting letter12. The county Permit Office still requires separate floodplain, septic and driveway permits when those apply, and the county does not issue certificates of occupancy unless one is requested for a fire-code inspection1. Septic permits come from that same office after a site evaluation, with fees from $310 to $510 depending on system type; inside the City of Gonzales, the city's Building Official handles building permits instead34.
At a glance
- Building permit
- Not required in unincorporated areas; the county's own letter lists no general building-permit program21
- Zoning
- None in unincorporated areas, stated directly by the county's own zoning and permitting letter15
- Septic
- Permitted by the county Permit Office after a site evaluation; $310-$510 depending on system type3
- Certificate of occupancy
- Not required unless requested as part of a fire-code inspection1
- RV / tiny home
- No county zoning rule outside city limits6
- Driveway permit
- Required for a new or upgraded driveway onto a county road; $50 residential fee78
- Floodplain permit
- Required for development in the mapped floodplain; $100 residential / $350 commercial9
- 10-acre septic exemption
- A single-family home on 10+ acres meeting state conditions may skip the OSSF permit10
Who to call
Building permits
Floodplain, septic, driveway, subdivision-exception and fire/burn-ban permits for unincorporated Gonzales County; the county has no separate building or zoning department
1811 Water Street, Gonzales, TX 78629
Zoning
Gonzales County Office of Emergency Management and Permits (Fire Marshal)
The county's official statement on zoning, permitting and certificate-of-occupancy requirements for construction in unincorporated Gonzales County
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 Gonzales County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Gonzales County, Texas?
Unincorporated Gonzales County has no general building-permit program2. The county's own zoning and permitting letter tells builders exactly what construction in unincorporated areas needs: floodplain permits where they apply, septic permits when necessary, and driveway permits when a new drive connects to a county road, with no general building permit listed among them1. Fire permits and plan reviews are required only for a commercial building or a rental community1. Gonzales County does not issue certificates of occupancy unless one is requested as part of a fire-code inspection1. None of this reaches property inside the City of Gonzales, where the city has adopted building codes and requires an application to its Building Official before construction4. We could not confirm whether a city's rules extend into its extraterritorial jurisdiction, so ask the city if your land is near its edge.
Who issues permits in Gonzales County, and how do you reach them?
Floodplain, septic, driveway, subdivision-exception and fire permits for unincorporated Gonzales County all run through one office: the Gonzales County Permit Office at 1811 Water Street, Gonzales, TX 78629, phone (830) 672-6209, email permits@co.gonzales.tx.us11. The county has no separate building department or zoning office to contact25. If your access comes off a state highway rather than a county road, contact the Texas Department of Transportation instead: TxDOT requires its own Form 1058 driveway permit and 24 hours' notice before construction starts in the highway right-of-way12. Inside the City of Gonzales, contact the city's Building Official for building permits instead of the county4.
Does Gonzales County have zoning?
There are no zoning regulations for the unincorporated areas of Gonzales County, according to the county's own zoning and permitting letter1. Texas gives counties zoning power only in narrowly defined situations, and Gonzales County has not been given general zoning power13. That leaves unincorporated Gonzales County with no minimum lot size, setback, lot-coverage, building-height or minimum-dwelling-size rule, and no zoning restriction on an accessory dwelling, manufactured home or tiny home6. Inside the City of Gonzales, zoning applies instead: the city is divided into zoning districts to guide growth and land use14. Whether city zoning reaches the city's extraterritorial jurisdiction is not confirmed, so ask the city before assuming it does not. Land divided into lots outside city limits still needs a subdivision plat approved by the Commissioners Court, or an approved exception, even though no zoning applies15.
How do septic permits work in Gonzales County?
The Gonzales County Permit Office administers septic (OSSF) permits directly as the TCEQ-authorized local agent, rather than sending applicants to the state1611. Before you can get a permit, the office performs a site evaluation of the property to determine soil type and suitability16. Permit fees run $310 for a conventional system, $410 for an aerobic or engineered system, and $510 for a commercial or industrial system, and the office processes applications in 5 to 7 working days once it has everything it needs3. A finished system still needs an inspection showing it was installed to TCEQ construction standards before the county issues a permit to operate17. Texas's statewide 10-acre rule can exempt a single-family home from OSSF permitting entirely if the tract is at least 10 acres, the home is the only dwelling on it, every part of the system sits at least 100 feet from the property line, and a licensed evaluator confirms the other conditions10. Soil here works against the conventional option either way: fewer than 8% of Gonzales County's soils carry no severe limitation for a standard drain field, so plan on the possibility of the pricier aerobic system18. An engineer or registered sanitarian must design the system on Type 1a or Type IV soil, on floodplain sites and in subdivisions restricted to engineered systems, and the permit review asks for an approved 911 address, proof of ownership and a driveway permit, plus a septic affidavit and maintenance contract for aerobic systems3.
Can you live in an RV or tiny home on your land in Gonzales County?
Outside city limits, no county zoning ordinance restricts RV, travel-trailer or tiny-home occupancy on unincorporated Gonzales County land, and the county's own letter confirms it has no zoning regulations there at all61. A driveway serving the property still needs a county driveway permit if it connects to a county road, including for a use the county classifies as a mobile-home or RV park, which carries its own $400 fee8. If the site sits in the mapped floodplain, only parking, access and storage are allowed below the base flood elevation, so a floodplain parcel is a poor fit for ground-level RV living without a permitted, elevated setup9. None of this reaches property inside the City of Gonzales, which regulates through its own zoning districts14.
Building a home in Gonzales County: the steps, in order
- Confirm the parcel sits outside the City of Gonzales and any other municipality's limits, and ask a nearby city whether its rules reach into its extraterritorial jurisdiction; unincorporated land has no county zoning or general building permit21.
- Contact the Gonzales County Permit Office to check whether the parcel is in the mapped floodplain and needs a floodplain development permit before you build119.
- Apply for a driveway permit with the Permit Office if your access comes off a county road. A permit is needed for a new driveway, a culvert, changing dirt to concrete or asphalt, or widening, but not for adding gravel to an existing gravel driveway7. Bring the application, a map of the proposed driveway, and the fee before any work starts19.
- Get a site evaluation and apply for your OSSF permit before you site the house, since soil results determine whether a conventional or aerobic system is allowed318.
- File a subdivision plat, or an Affidavit of Land Location & Exception if the tract qualifies, with the Commissioners Court before dividing or selling part of the property; the exception application fee is $100 and non-refundable, and land used primarily for agriculture, ranching, wildlife management or timber production may qualify1520.
- Schedule your septic inspection once the system is installed; the county issues a permit to operate only after confirming the system meets TCEQ construction standards17.
- Gonzales County does not require a certificate of occupancy unless you request one as part of a fire-code inspection, which applies mainly to commercial buildings and rental communities1.
What to check before you buy land in Gonzales County
Budget for a harder septic system: fewer than 8% of Gonzales County's soils carry no severe limitation for a conventional drain field, so an aerobic system near $410 rather than a $310 conventional one is a realistic outcome183. The county sits in a region that spends roughly 23% of years in severe drought and gets under 35 inches of rain annually, so confirm a well or rural water access before you commit2122. All of the county's land sits at 15% slope or less, which is favorable for building and septic siting on most parcels, but a site-specific soil test still decides your system type23. If the parcel is near a creek or low area, ask the Permit Office whether it sits in the mapped floodplain before you buy, since that adds a separate development permit and limits any living space below the base flood elevation9. Gonzales County's effective property tax rate runs about 1.2%, with a median annual bill near $1,9492425.
Watch-outs
- Whether Gonzales County requires a water or sewer utility connection, and whether it regulates short-term rentals outside city limits, was not confirmed on an official county page; ask the Permit Office before you plan around an assumption11.
- An owner-builder exemption from Gonzales County permit or inspection requirements was not confirmed on any official county or state page26.
Sources
- Gonzales County Office of Emergency Management and Permits (Fire Marshal) (co.gonzales.tx.us)
- Gonzales County - OSSF/Permits (2026 county census)
- Septic Permit Packet, quoted and re-checked
- Building Permits & Inspections — City of Gonzales, quoted and re-checked
- Gonzales County - OSSF/Permits (2026 county census)
- Texas law on county zoning and building authority
- Driveway Permit Checklist, quoted and re-checked
- Gonzales County Texas County Permits, quoted and re-checked
- Floodplain Development Permit Application, quoted and re-checked
- Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
- Gonzales County Permit Office (co.gonzales.tx.us)
- Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
- Local Government Code Chapter 231, County Zoning Authority (Texas statewide rule), quoted and re-checked
- Government — City of Gonzales, quoted and re-checked
- Application for Exception to Subdivision Rules, quoted and re-checked
- Septic Permit Packet, quoted and re-checked
- Septic Permit Packet, quoted and re-checked
- 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
- Driveway Permit Checklist, quoted and re-checked
- Application for Exception to Subdivision Rules, quoted and re-checked
- Share of years in severe drought: Bolthole Index county data
- Annual precipitation: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Exemptions to Electrician Licensing (2026 county census)
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.