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

Unincorporated Reagan County appears to have no general building-permit requirement. Texas law limits county building-permit authority: a county may adopt a fire-code permit only if its population is over 250,000 or it is adjacent to such a county, and residential building-code standards require a commissioners court order¹⁰. Reagan County has about 3,141 residents, and its official website lists no building, inspection or permitting department for unincorporated land^1,11. We found no written statement from the county that no permit is required, and no adopted building or fire code was confirmed, so confirm with the County Clerk's office before you build⁷.

The Reagan County Clerk's office is the general contact for county administration, and it is also where a driveway/access permit application is filed^4,7. Reach the office at (325) 884-2442, at 300 North Plaza Avenue, or by mail at P.O. Box 100, Big Lake, TX 76932⁷. No local OSSF (septic) authorized agent was confirmed for Reagan County; where no local jurisdiction has been authorized, the Texas Commission on Environmental Quality's regional office is the default permitting authority, though this has not been separately confirmed for Reagan County³. Land inside the City of Big Lake has its own Code Enforcement office, which issues building, electrical and mobile-home permits valid for six months under the 2009-edition International Codes⁶.

Unincorporated Reagan County has no county zoning ordinance: Texas law gives counties zoning power only in a handful of specific situations, and Reagan County is not one of them¹. Because the county has no zoning authority over unincorporated land, it sets no minimum lot size, no setbacks, no lot-coverage limit, no building-height limit and no zoning districts, and RVs, tiny homes and manufactured homes are unrestricted by county zoning outside city limits². That is a real answer, not a research gap: it follows directly from Texas law giving a county like Reagan no general zoning power². Inside the City of Big Lake, the rules are different: the city's zoning ordinance divides the city into zoning districts and names the City Administrator as Zoning Administrator, while Code Enforcement issues building permits under its adopted codes^5,6. None of that reaches unincorporated Reagan County, and septic permits are a separate matter under the state's OSSF rule wherever the address is^1,3.

Dividing land is a different matter: outside municipal limits a plat is generally required when a tract is divided into two or more parts⁹. An exception applies when the land will be used primarily for agricultural, farm, ranch, wildlife-management or timber-production purposes, and the platting rule returns if that use ends⁹.

Every on-site sewage facility in Texas needs a permit and an approved plan before construction, alteration, repair or extension, with one narrow exception³. The exception is a "10-acre rule": a single-family home on at least 10 acres, evaluated by a licensed site evaluator or professional engineer, with every part of the OSSF at least 100 feet from the property line, no other dwelling on the tract, and no nuisance or groundwater pollution³. No local authorized agent for OSSF permitting has been confirmed for Reagan County; the TCEQ regional office is the default permitting authority where no local jurisdiction has been authorized, but ask the County Clerk's office who currently handles it before you apply^3,7. A homeowner may install their own OSSF for a single-family home they own only if the permitting authority allows it and no part of the property will be developed for sale or lease³. With 46.1% of Reagan County's soils free of severe limits for a conventional septic drain field, a standard system is workable on much of the land here¹¹.

Yes, with conditions: unincorporated Reagan County has no zoning ordinance, so it sets no rule restricting RV, tiny-home or manufactured-home occupancy on private land, a direct result of Texas law giving the county no general zoning power². The same lack of zoning means there is no minimum dwelling size and no accessory-dwelling rule in unincorporated Reagan County². Any wastewater system connected to the RV, tiny home or manufactured home still needs an OSSF permit under Texas's statewide septic rule³. Inside the City of Big Lake, construction and mobile-home placement go through Code Enforcement instead, with permits valid for six months⁶.

1. Confirm the parcel is outside the City of Big Lake's limits, since the city enforces its own building codes under a six-month permit while the unincorporated county does not^1,6.
2. Call the Reagan County Clerk's office at (325) 884-2442 for general county questions and for the county's driveway/access permit application^4,7.
3. Building a driveway onto a Reagan County road? A residential driveway's dimensions are set by the precinct commissioner, and a non-residential driveway on a paved road must be at least 50 feet wide and 28 feet long with 6 inches of compacted base⁴.
4. Building a driveway onto a state highway instead? File TxDOT Form 1058 and give TxDOT 24 hours' notice before construction, after the permit is fully executed⁸.
5. Before you dig a septic system, ask the County Clerk's office who currently handles OSSF permitting for your Reagan County parcel, since no local authorized agent has been confirmed^3,7.
6. Get your OSSF plan approved and the permit issued before construction; unless you qualify for the state's narrow 10-acre exemption, a permit is required regardless of lot size³.
7. No county building permit or inspection has been confirmed as required in unincorporated Reagan County, but confirm with the County Clerk's office before you start, since the county's pages don't say so in writing^1,7.
8. If you plan to divide the tract, ask the County Clerk's office how platting applies; outside city limits a plat is generally required, with an exception for primarily agricultural use^7,9.

Reagan County's septic odds are better than many nearby counties: 46.1% of its soils have no severe limits for a conventional drain field, though the remaining share will need an engineered or alternative system¹¹. The county is flat and dry -- 97.3% of land sits at 15% slope or less, with almost no tree cover at 0.1% wooded -- and it sees severe drought in about 20.5% of years, worth planning for with any well¹¹. Reagan County is rural and sparsely populated, with 3,141 residents at about 2.7 people per square mile, roughly 61 miles from the nearest metro area¹¹. Any new driveway needs a permit before you build it -- from the County Clerk's office for a county road, or from TxDOT (Form 1058) for a state highway^4,12. Property taxes run an effective 1.1% rate, with a median annual bill of $1,825¹¹.