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

Yes: building permits in unincorporated Willacy County come from the county Permits Department, which accepts applications for residential and commercial construction, manufactured homes, electrical, plumbing/gas and mechanical work, and demolition¹. The first hurdle is the plat: the county's checklist says a building permit application cannot be issued if the plat is not recorded³. Starting construction before approval doubles the approved application fee³. Residential new construction is priced at $0.18 per square foot, with a $5 processing fee and a 25 percent plan review fee on top of the permit fee⁴. We could not confirm which building-code edition the county enforces, so ask the Permits Department what your plans will be reviewed against¹.

The Willacy County Permits Department issues building, electrical, plumbing/gas, mechanical, demolition, manufactured-home and moving permits, and is reached at (956) 689-3393 at 576 W. Main Ave, Raymondville, Texas 78580¹. Applications are posted on the county site as downloadable forms, and permits are submitted to the Tax Office Monday through Friday, 8:00am to 11:30am and 1:00pm to 4:00pm^1,8. Permit fees are cash or check only¹. The initial checklist asks for a recorded plat, a completed application, a deed and a tax statement⁸. Septic permits come from the same office¹.

Unincorporated Willacy County has no county zoning ordinance: the county's Permits page lists a Flood Plains Ordinance and Subdivision Rules and Regulations but no zoning code¹. With no zoning, the county sets no minimum lot size, setback, lot-coverage or height limit through zoning, and none restricts an accessory dwelling, RV, tiny home or manufactured home². That does not mean no setbacks at all: the residential permit application says no construction is allowed over an easement, and building setbacks must be met before the foundation is poured⁴. Cities such as Raymondville may have their own rules inside city limits, so ask city hall if your parcel is inside one; the county's rules above cover unincorporated land only.

Septic permits in Willacy County are separate from building permits: the residential building application says a separate permit is required for septic tank installation⁴. The Permits Department handles them as the state's local authorized agent for on-site sewage facilities^1,5. The application asks for site, soil, water-supply and design information, including suitable soil at least 24 inches deep beneath the drain field and at least 2 borings or backhoe pits at opposite ends of the absorption area⁴. After installation, a permit to operate is granted following successful inspection⁹. The local agent sets the permit and inspection fees, plus a $10 state fee per permit; we could not confirm the county's fee amount, so ask the Permits Department¹⁰. Texas exempts a single-family home on at least 10 acres only if every listed condition is met, including keeping all parts of the system at least 100 feet from the property line¹¹. About 36.7% of the county's land is rated free of severe limits for a conventional drain field⁷.

Unincorporated Willacy County has no zoning ordinance, so no county zoning rule limits living in an RV, a tiny home or a manufactured home on private land². A manufactured home still needs a county manufactured-home permit, with a $150 permit fee^1,4. Any home that needs sewage disposal needs a septic permit whatever type of dwelling it is⁴. In a flood zone, the county requires a floodplain development permit and elevation documentation³. We could not confirm a county rule on short-term rentals; ask the Permits Department.

1. Confirm the lot has a recorded plat and check whether it is in a flood zone, because a building permit cannot be issued without the plat and flood-zone projects need a floodplain development permit³.
2. Apply for the septic permit through the Permits Department if no sewer serves the lot⁴.
3. Submit the residential building application, plus electrical, plumbing/gas and mechanical applications as needed, to the Permits Department at 576 W. Main Ave, Raymondville, (956) 689-3393¹.
4. Pay the permit fees in cash or by check¹.
5. Do not start work before approval, because that doubles the approved application fee³.
6. Contact the Inspection Department 48 hours before the foundation pour so setbacks and finished floor elevation can be checked⁴.
7. If a driveway meets a state highway, submit TxDOT Form 1058 and wait for the executed permit¹²; a county driveway fee of $45 appears on the county fee schedule¹³.

Willacy County has about 20,037 residents at roughly 33.9 people per square mile, and the nearest city of 100,000 or more is about 35 miles away⁷. Land is flat, with all of it at 15% slope or less⁷. Rainfall averages about 25.3 inches a year, with severe drought in roughly 20.2% of years, so plan your water supply; we could not confirm a county well-permit rule, so ask the Permits Department⁷. Federal land covers about 11.9% of the county, so check whether a parcel borders it⁷. Farmland has recently valued around $2,789 an acre and a typical home around $174,196, against a roughly 1.9% effective property tax rate⁷. Typical home insurance runs about $2,219 a year⁷.