20×20 Metal Building Cost in Willacy County, Texas
Estimated range based on 2026 market data and Willacy County design requirements. Final pricing requires a dealer quote.
Prefer a kit you install yourself? A 20×20 kit-only package in Willacy County runs about $5,200 – $9,000 (steel only, no erection or slab). The installed range above includes delivery and erection.
We price 20×20 metal buildings for Raymondville, Lyford, San Perlita and across Willacy County.
What the 20×20 estimate includes — and what it doesn't
Most price pages won't tell you this. The slab alone can add a third again on top of the building, so here's the honest breakdown.
Included in the installed range
- The building — frame, roof and wall panels, trim, fasteners
- Engineering for Willacy County's loads — 142 mph design wind, TDI windstorm (WPI-8)
- Stamped drawings for your permit application
- Delivery to your prepared site
- Professional erection on a level, ready pad
- Anchors for the slab or ground type specified
Not included — budget separately
| Item | Typical cost |
|---|---|
| Concrete slab Texas-typical for 20×20 — about $5.00–$9.00/sq ft. Depends on soils report and local ready-mix. | $2,000 – $3,600 |
| 10×10 roll-up door Each | $1,200 |
| 12×12 roll-up door Each | $1,600 |
| 3'×7' walk-in door Each | $450 |
| 3'×3' window Each | $350 |
| Insulation Double-bubble through R-17 double-layer, quoted per sq ft of covered area (roof + walls), not footprint. | $1.50–$3.00/sq ft |
| Permit fees Set by Willacy County Permits Office (Floodplain / Development). Fees differ inside city limits, in the ETJ, and unincorporated — confirm directly. | Varies |
Site prep — clearing, grading, and getting a truck to the pad — is the other variable we can't price for you. A level, accessible site is what keeps an install to a single day; a sloped or tight one is where surprise costs come from.
Price estimator
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Adjust size, county, height and doors for a live range. Same math as the price band above.
What drives the price in Willacy County
A 20×20 building (400 sq ft) is in the garage-and-workshop range — big enough for vehicles, a home shop, hobby space, or storage, small enough to go up fast on a simple slab. It's the most common size for residential buyers. In Willacy County, the design loads above — not just the size — decide where in the range your price lands.
Willacy County's 142 mph design wind speed is in the elevated-inland-coast band. This meaningfully changes the steel package: heavier columns, closer fastener spacing, and often rod-and-cable or portal bracing. Any reputable supplier will engineer to 142 mph for this county, and the price band on this page already reflects that added steel.
TDI windstorm certification (WPI-8) applies here
Willacy County is inside a Texas Department of Insurance (TDI) designated catastrophe area. To insure a structure through the Texas Windstorm Insurance Association (TWIA) — and often to satisfy the local building department — the building must be engineered to TDI standards and pass a WPI-8 windstorm inspection. In practice that means TDI-approved product evaluations, an engineer's design that meets the county wind load, and inspection at framing and completion so the installer can file for the WPI-8 certificate of compliance.
Budget for engineered, stamped plans and the inspection itself. Skipping certification can leave the building uninsurable against wind and hail in this county, so we've built the WPI-8 premium into the coastal price band rather than hiding it.
Foundation & slab in Willacy County
Steel is only half the job — the concrete under it is the other half. Rio Grande Valley ground is largely alluvial clay and silt with a shallow water table. Slabs benefit from good drainage detailing and edge reinforcement; a soils check is worth it before you pour. The slab range shown in the estimator is a Texas-typical figure; your final number depends on a soils report and the local ready-mix price.
Willacy County is Seismic Design Category A. Like nearly all of Texas, seismic loads do not govern a metal building's design here — wind is the controlling force, not earthquakes — so seismic adds nothing to the price band.
Permits in Willacy County
For a metal building in Willacy County, permitting typically runs through the Willacy County Permits Office (Floodplain / Development) (956-689-3393). Requirements vary by whether you're inside a city limit, in the ETJ, or unincorporated, and most departments want the supplier's engineered, stamped drawings before they'll issue. Confirm current fees and setbacks with the office directly — we verify these links but rules change.
Frequently asked questions
- How much does a 20×20 metal building cost in Willacy County, TX?
- A 20×20 metal building in Willacy County typically runs $7,100 – $13,100 installed and delivered. That range reflects Willacy County's 142 mph design wind speed, TDI windstorm (WPI-8) requirements, and current Texas market pricing. Final pricing requires a dealer quote.
- Why does the price change by county?
- Steel is engineered to local building loads. A county's design wind speed, snow load, seismic category, and — on the coast — TDI windstorm certification all change how much steel and engineering the building needs. That's why Willacy County has its own price band instead of one statewide number.
- Do I need a permit for a metal building in Willacy County?
- Usually yes. Permitting typically runs through the Willacy County Permits Office (Floodplain / Development), and most departments require the supplier's engineered, stamped drawings. Requirements differ inside city limits versus unincorporated areas — confirm with the office before ordering.
- Does a 20×20 building in Willacy County need windstorm certification?
- Yes. Willacy County is in a TDI-designated catastrophe area, so the building must be engineered to TDI standards and pass a WPI-8 inspection to be insurable through TWIA. Budget for stamped plans and the inspection; both are included in the coastal price band shown here.