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

Madison County's own permits page lists addressing house signs, water line agreements, electric permits, solar electric waivers, septic permits, food establishment permits, driveway access permits and a floodplain development permit, but no building permit for an ordinary house². That silence is the closest thing to an answer the county's site gives; it does not separately state that building permits are exempt, only that none is listed among the permits it issues². Texas law lets a county adopt state residential building standards by resolution, and nothing on the county's site shows that Madison County has done so, so confirm with the Madison County Commissioners Court before you build⁹. Inside the City of Madisonville, the city has its own planning and zoning rules, and a county plan published in 2013 reported a city building code adopted in 1993 that does not establish the current code^3,10. Ask the City of Madisonville about building permits there; septic permits stay with the county Wastewater Office⁴.

Madison County has no separate building or zoning department; septic permitting runs through the Wastewater Office at 101 W. Main, Suite B-22, Madisonville, Texas 77864, phone 936-348-2152, which is the county's designated representative for septic permits⁴. New 9-1-1 addresses and house-sign orders go through the Rural Development / 9-1-1 Addressing Office at 101 W. Main, Suite B-13, phone 936-348-3810¹¹. A floodplain development permit application is also posted on that office's page, and the application refers to a Madison County Floodplain Administrator^5,11. Driveway and culvert work needs sign-off from the commissioner of the precinct where the land sits, reachable through the county courthouse switchboard at 936-241-6200 with the extension for that precinct⁷.

Unincorporated Madison County has no zoning ordinance, and Texas law does not hand counties general zoning power outside a short list of special districts that do not include Madison County¹. That means the county sets no minimum home size, no minimum lot size, no setbacks and no lot-coverage limit on unincorporated land¹. It also means the county does not restrict living in an RV, a tiny home, a manufactured home or an accessory dwelling on your own unincorporated parcel¹. The county's own driveway permit application even lists "Single Mobile Home or RV" as a normal type of entrance to plan for⁷. Land inside the City of Madisonville is different: its Planning and Zoning Commission oversees rezoning, conditional use permits, variances and plats, and the city posts a zoning map³. City zoning does not move septic: the county Wastewater Office still issues septic permits⁴. Confirm district rules for a specific lot directly with the City of Madisonville.

Madison County itself administers OSSF (septic) permits through the Wastewater Office and its designated representative⁴. A permit and approved plan are generally required for a septic system or holding tank, including an off-grid setup; boreholes, cesspools and seepage pits are prohibited¹². A single-family dwelling on at least 10 acres may qualify for an exemption only if every state condition is met, including keeping every part of the system at least 100 feet from the property line¹². A residential OSSF permit costs $400, and payment must be by check or money order rather than cash⁶. Only 3.2% of Madison County soils are rated without severe limitations for a conventional drain field, so many sites may need an engineered or alternative system¹³. The installer must give at least five working days' notice before the required construction inspection¹⁴.

Yes, on unincorporated land in Madison County the county sets no zoning rule against living in an RV, a tiny home or a manufactured home, because the county has no zoning ordinance to write one¹. The county's driveway application lists "Single Mobile Home or RV" as an entrance type⁷. No-zoning does not mean no sanitation rule: an RV or tiny home using a septic system or holding tank generally needs a permit and approved plan from the Wastewater Office, unless the site meets every condition of the narrow state exemption^4,12. A new driveway also needs precinct-commissioner approval⁷. Deed restrictions or subdivision rules can still limit RVs or tiny homes even where county zoning does not, so check the plat and restrictive covenants before buying.

1. Confirm the parcel is in unincorporated Madison County rather than inside the City of Madisonville, where the city's zoning commission and separate rules apply³.
2. Determine whether the site is in a Special Flood Hazard Area; if it is, obtain the county floodplain development permit before starting any work, and note that the permit expires if no work starts within six months⁵.
3. Contact the Wastewater Office to plan the septic system; only 3.2% of county soils are rated without severe limitations for a conventional drain field^4,13.
4. If dividing land outside a city, confirm the platting requirement and any agricultural-use exception⁸.
5. Call the precinct commissioner before driveway or culvert work begins⁷.
6. Request a new address through the Rural Development / 9-1-1 Addressing Office¹¹.
7. For access to a state highway, submit Form 1058 to TxDOT before construction¹⁵.

Water: we could not confirm whether a groundwater conservation district regulates private wells in Madison County, so ask the county before counting on a well. Flood: determine whether the parcel lies in a Special Flood Hazard Area, because covered development needs a permit before work starts and cannot be occupied until the county issues a Certificate of Compliance⁵. Soils: only 3.2% of county soils are rated without severe limitations for a conventional septic field¹³. Access: county-road driveway work needs precinct approval, while state-highway access goes through TxDOT^7,15. Costs: typical home insurance is about $1,948 a year, the effective property tax rate is about 1.2%, and the median property-tax bill is about $1,722 a year¹³. Rural land is around $4,028 an acre¹³.