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

Unincorporated Delta County has no residential building-permit requirement¹. Texas law lets a county adopt a fire code and permits only if the county has more than 250,000 people or borders one that does, and then only for commercial, public and large multifamily buildings; Delta County's population of 5,520 is far below that mark^7,8. Delta County does run a Development Services office, but its published permits cover subdivision rules, driveway and culvert installation, and septic permits, not a residential building permit^1,2. Inside the City of Cooper, ask the city whether it requires building permits for your lot; the county does not issue them either way⁴.

Delta County's Development Services office is the right place to start for anything related to land development: subdivision rules, driveway and culvert installation onto a county road, and septic permits^2,9,10. The County Judge's Office oversees county administration and the Commissioners Court, and is the office to ask about anything not posted online, including floodplain questions¹¹. Neither office reviews building plans or issues a residential construction permit, because unincorporated Delta County doesn't run that program¹.

Unincorporated Delta County has no zoning ordinance or zoning districts; the county regulates land outside city limits only through its subdivision rules and regulations². Texas law gives counties zoning power only in narrowly defined special areas, and Delta County has not adopted county zoning^3,12. As a result, no county rule sets minimum lot size, setbacks, lot coverage, building height or accessory-dwelling limits on unincorporated land, and the county does not restrict living in an RV, tiny home or manufactured home³. Inside the City of Cooper the answer is different: the city has its own zoning ordinance and a Planning & Zoning Commission, so city rules apply to any lot within Cooper⁴. If you are subdividing a tract outside a city, Delta County's subdivision rules still apply and are worth checking with Development Services before you plat².

Delta County's Development Services administers on-site sewage facility (OSSF/septic) permits directly, acting as the local TCEQ-authorized agent rather than routing applications to a TCEQ regional office¹. Statewide, every OSSF requires a permit before construction, installation, alteration, extension or repair¹³. A limited exemption applies only on tracts of at least 10 acres, and only if every condition is met: a licensed site evaluator signs off, it's a single-family home, all parts of the system sit at least 100 feet from the property line, and the tract has no other dwelling¹³. Private water wells may also need a permit if Delta County falls inside a groundwater conservation district, though that hasn't been confirmed for this county specifically; ask Development Services or the County Judge's Office before you drill^2,11,14.

Delta County has no zoning ordinance, so there's no county rule restricting RV living, tiny homes or manufactured homes on your own land³. That's a real answer, not just an absence of research: Texas law gives Delta County no zoning power to regulate these uses in the first place³. Statewide rules about licensed RV parks and campgrounds don't apply to living in your own RV on your own land, so don't read those as a limit here. Whatever dwelling you choose, its septic system still needs a Delta County OSSF permit, since that requirement doesn't depend on the structure being a conventional house¹. If you're subdividing land first, Delta County's subdivision rules still apply even though its zoning rules don't².

1. Confirm your parcel is in unincorporated Delta County and check whether it's already part of a platted subdivision, since the county's subdivision rules apply either way².
2. Call Delta County Development Services to confirm the current culvert and driveway permit process before you build a new entrance onto a county road⁹.
3. Apply for a Delta County on-site sewage facility (OSSF) permit through Development Services before you design your septic system^1,10.
4. If your tract is at least 10 acres, have a licensed site evaluator confirm in writing whether you qualify for the state's septic-permit exemption, since every condition has to be met¹³.
5. If you're adding or changing access onto a state highway rather than a county road, submit TxDOT Form 1058 and wait for a fully executed permit before starting work¹⁵.
6. Ask the County Judge's Office to confirm current floodplain status for your parcel before you finalize your building site¹¹.

Delta County is one of the wetter, greener rural counties in this guide, averaging 46.1 inches of rain a year, with severe drought in only 21.1% of recent years and 21.5% of the land wooded⁷. Soils here support a conventional septic drain field on only 6.6% of the county's land, so plan on testing your specific parcel closely and budgeting for an engineered system if it doesn't pass⁷. The land is entirely gentle, with 100% at 15% slope or less, and about 5.6% of the county is federal land⁷. Delta County sits about 55 miles from the nearest metro area, and its effective property tax rate runs around 1%, with a median annual bill near $1,456⁷. Budget for a typical home insurance premium around $2,178 a year, and confirm driveway, septic and subdivision requirements with Development Services before you close^2,7.