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

Unincorporated Brazos County requires a Development Permit from the Road & Bridge Department before construction, plus a Floodplain Development Permit that the county says is required for all development^1,2. On September 1, 2009, Brazos County adopted the 2003 International Residential Code and the 2002 National Electrical Code, and proof of construction compliance with them is required in the unincorporated areas³. The county does not issue certificates of occupancy³. We could not confirm which inspections the county performs; ask the Road & Bridge Office what review your project will receive¹².

If the parcel is inside Bryan, College Station, Kurten or Wixon Valley, or in one of their extraterritorial jurisdictions, check with that city because its permitting rules apply there³.

There's no separate county building department in Brazos County: the Road & Bridge Office issues the Development Permit, the Floodplain Development Permit, and road and driveway access permits, all from the same office in Bryan¹². Septic (OSSF) permits go through the Brazos County Health District, which acts as TCEQ's authorized agent for the county, reviewing designs, issuing permits and inspecting installations^7,13. If your property is inside a city or its extraterritorial jurisdiction, that city's own building and zoning offices apply instead of the Road & Bridge Office; the county directs applicants in Bryan, College Station, Kurten and Wixon Valley to check with the city³. Septic permits stay with the Health District even in the other cities, except inside Wixon Valley city limits⁵.

Unincorporated Brazos County has no county zoning regulations or county zoning districts⁶. Its zoning rules therefore impose no minimum dwelling size, minimum lot size, setback, lot-coverage limit or building-height limit on unincorporated land⁹. The county states that property in a city's extraterritorial jurisdiction must follow that city's zoning regulations, and the City of Bryan publishes a Comprehensive Zoning Ordinance^4,14. Verify the parcel's jurisdiction before relying on the county answer⁶. Brazos County also regulates land division even without zoning: dividing a tract into two or more parts generally requires a plat approved by Commissioners Court, subject to listed exemptions¹⁰.

Septic systems (OSSFs) in Brazos County are permitted locally: the Brazos County Health District acts as TCEQ's authorized agent, reviewing designs, issuing permits and inspecting installations^7,13. A permit is generally required before you construct, install, alter, extend or repair an OSSF, and the Health District has 30 days from receiving a complete application to approve or deny it, with a written explanation if it's denied⁷. Once installed, inspection is required before any part of the system is covered, and a $100 fee applies if a re-inspection is needed¹⁵. A new OSSF application for new construction must include the Floodplain Development Permit, and the Health District's fee for a new system is $400⁵. Texas also exempts an OSSF from permitting under the 10-acre rule, which requires a licensed site evaluation, a single-family dwelling that is the only dwelling on a tract of at least 10 acres, and every part of the system at least 100 feet from the property line⁷. Soils here are genuinely difficult: only about 2.4 percent of Brazos County's soils are free of severe limitations for a conventional septic drain field, so plan on a site evaluation and budget for an alternative or engineered system rather than a standard drain field¹⁶.

Unincorporated Brazos County sets no county zoning rule for living in an RV, tiny home or manufactured home, temporary camping, or an accessory dwelling⁸. A tiny home also has no minimum dwelling size imposed by county zoning⁹. Those answers do not waive other requirements: development still requires the county Development Permit and Floodplain Development Permit, and an OSSF generally needs a septic permit^1,2,7. We could not confirm the rules for short-term rentals or multi-space RV and manufactured-home rental communities; ask the Road & Bridge Office about those plans¹².

First, confirm your parcel is in unincorporated Brazos County rather than inside a city or its extraterritorial jurisdiction, since city rules apply there instead⁶. Second, plan to show proof of compliance with the adopted 2003 residential code and 2002 electrical code³. Next, apply for a Development Permit from the Road & Bridge Department before you start construction^1,12. Then apply for a Floodplain Development Permit at the same office; the county says this is required for all development and typically takes about two weeks to process once your documents are complete^2,12. After that, contact the Brazos County Health District early for your septic (OSSF) permit, since the county has 30 days to act on a complete application and you'll want your soil evaluation done before you finalize your site plan^7,13. If you're creating a new lot rather than buying an existing one, get your plat prepared and approved by Commissioners Court, checking first whether your situation qualifies for an exemption such as agricultural use, a family transfer, or lots larger than 10 acres¹⁰. Finally, if your driveway needs a culvert or other right-of-way access, apply through the Road & Bridge Office; new construction runs $100 for a residential or commercial culvert, and work on an existing one runs $50^11,12.

Brazos County is almost entirely gentle terrain: 99.8 percent of its land has a slope of 15 percent or less, and 30.2 percent is wooded¹⁶. Septic suitability is the sharper constraint: only about 2.4 percent of county soils are rated without severe limitations for a conventional drain field, so obtain a site evaluation before committing to a homesite or system budget¹⁶. Confirm whether the parcel lies in a city or extraterritorial jurisdiction, check floodplain requirements, verify legal road access, and determine whether a land division needs plat approval^2,6,10. The effective property-tax rate is about 1.6 percent, and the median annual property-tax bill is about $4,580¹⁶.