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

Unincorporated Hemphill County does not require a general county building permit for an ordinary site-built home¹. Industrialized and modular housing is different: state installation or alteration requirements can apply outside a municipality¹⁰. A qualifying purchaser installing an industrialized house or residential modular component for personal use may obtain a residential installation permit instead of registering as an industrialized builder; that state permit does not waive inspections or mandatory codes¹⁰. Inside Canadian, the city requires a building permit before work covered by its building code begins; the cited code provision covers buildings other than single-family residential structures, so ask the city what code and permit process applies to a house³. Septic permits still go through TCEQ Region 1, and wells still go through the Hemphill County Underground Water Conservation District^5,6.

Hemphill County has no general building-permit or inspection department for ordinary site-built homes in unincorporated areas¹. Canadian issues city building permits for work governed by its building code and publishes a city permit-fee schedule; its separate street-cut repair fees apply to utility or licensed-plumber cuts within the city, not rural construction^3,11. TCEQ Region 1 issues septic permits throughout Hemphill County because there is no local OSSF agent^5,12. The County Judge's Office handles underground crossings, road cuts and waterline crossings on county roads^13,14. A driveway connecting to a state highway requires TxDOT approval¹⁵. We could not confirm a county-road driveway or culvert rule, so ask the County Judge's Office about access before construction¹⁴.

Unincorporated Hemphill County has no county zoning, so the county does not set zoning districts, minimum dwelling size, minimum lot size, setbacks, lot coverage or building height there². That answer does not erase septic, well, subdivision, floodplain, deed-restriction or access requirements. Inside Canadian, municipal zoning applies, and the city uses a variance process⁴. Canadian also requires building permits for work covered by its adopted building code, while septic permits remain with TCEQ Region 1 and wells remain with the Hemphill County Underground Water Conservation District^3,5,6. For land outside another incorporated municipality, confirm city-limit and extraterritorial-jurisdiction status before assuming the unincorporated-county answer controls⁹.

A septic permit and approved plan are generally required to construct, alter, repair, extend or operate an on-site sewage facility in Hemphill County⁷. TCEQ Region 1 is the permitting authority because Hemphill County has no local OSSF agent^5,12. The state exemption for a qualifying large tract applies only when every condition is met, including a licensed site evaluation, a single-family dwelling as the only dwelling on the tract, no nuisance or groundwater pollution, on-property effluent disposal and the required property-line separation⁷. Grandfathered systems and specified emergency repairs have separate limited exceptions⁷. Only 32.9% of county soils are free of severe limitations for a conventional drain field, so obtain the site evaluation before fixing the house location¹⁶.

Unincorporated Hemphill County has no county zoning restriction on tiny-home or manufactured-home occupancy, but that does not answer sanitation, floodplain, deed-restriction or utility requirements². We could not confirm a rule that answers long-term RV occupancy on unincorporated private land; ask the County Judge's Office before using an RV as a residence¹⁴. The county's published RV limits cover public campgrounds, not private property⁸. Inside Canadian, city zoning applies to the parcel, while septic permits still go through TCEQ Region 1 and wells still go through the water district^4,5,6. An RV, tiny home or manufactured home using an OSSF generally needs septic approval unless a state exception applies⁷.

1. Confirm whether the parcel is inside Canadian or another municipality; unincorporated Hemphill County has no general county building permit or county zoning, while Canadian has city zoning and building-permit rules^1,2,3,4.
2. Confirm the tract was legally divided. State law generally requires a subdivision plat outside municipalities, while a qualifying agricultural, farm, ranch, wildlife-management or timber-production division may be exempt⁹.
3. Ask TCEQ Region 1 for the septic permit process and arrange the site evaluation^7,12.
4. Register an exempt well or obtain the applicable district permit before drilling⁶.
5. Obtain TxDOT approval for state-highway access or county approval for an underground crossing, road cut or waterline crossing^13,15.
6. If the project uses industrialized or modular housing, confirm the separate state requirements before installation¹⁰.

Start with septic suitability: only 32.9% of Hemphill County soils are free of severe limitations for a conventional drain field¹⁶. Confirm that a divided tract has any required plat approval and tax certificate; an agricultural-use plat exemption is limited and does not remove septic, floodplain, water-district or municipal rules^9,17. Plan water before closing because every new exempt or non-exempt well must be registered or permitted through the Hemphill County Underground Water Conservation District before drilling⁶. The county averages 23.3 inches of precipitation a year and experiences severe drought in 32.3% of years¹⁶. The effective property-tax rate is about 1.2%, with a median annual bill near $2,502¹⁶.