Metal Building Prices in Calhoun County, Texas
Installed price ranges below are engineered to Calhoun County's design loads — 149 mph design wind speed, TDI windstorm (WPI-8) certification, and no governing snow load. Pick a size for the full breakdown.
Serving Port Lavaca, Point Comfort, Seadrift and the rest of Calhoun County.
| Design wind speed | 149 mph — Coastal high wind |
|---|---|
| Ground snow load | 0 psf — non-governing |
| Seismic design category | A — non-governing in TX |
| TDI windstorm (WPI-8) | Required — catastrophe area |
| Region / county seat | Coastal · Port Lavaca |
| Permitting office | Calhoun County Floodplain Administration · 361-553-4455 |
Prices by size in Calhoun County
| Size | Sq ft | Installed range |
|---|---|---|
| 12×20 | 240 | $4,400 – $8,000 |
| 20×20 | 400 | $7,400 – $13,500 |
| 20×30 | 600 | $11,100 – $19,700 |
| 24×30 | 720 | $13,500 – $24,000 |
| 30×30 | 900 | $16,600 – $30,100 |
| 24×40 | 960 | $17,800 – $32,000 |
| 30×40 | 1,200 | $20,900 – $36,900 |
| 30×50 | 1,500 | $25,800 – $46,100 |
| 40×40 | 1,600 | $27,700 – $49,200 |
| 30×60 | 1,800 | $30,800 – $55,400 |
| 40×60 | 2,400 | $41,200 – $73,800 |
| 50×50 | 2,500 | $43,100 – $76,900 |
| 50×60 | 3,000 | $51,700 – $81,200 |
| 40×80 | 3,200 | $55,400 – $86,700 |
| 40×100 | 4,000 | $68,900 – $108,200 |
| 50×80 | 4,000 | $68,900 – $108,200 |
| 60×80 | 4,800 | $82,400 – $129,800 |
| 50×100 | 5,000 | $86,100 – $135,300 |
| 60×100 | 6,000 | $103,300 – $162,400 |
| 60×120 | 7,200 | $124,200 – $195,000 |
| 80×100 | 8,000 | $137,800 – $216,500 |
Estimated range based on 2026 market data and Calhoun County design requirements. Final pricing requires a dealer quote.
Building in Calhoun County
Calhoun County is open-coast wind country at 149 mph design wind speed — among the highest in Texas. Buildings here are engineered for direct hurricane exposure: heavy-gauge frames, dense fastening, upgraded anchorage, and stamped drawings are not optional. This is the single biggest driver of the price band above, and it's why a building in Port Lavaca costs more than the same size inland.
TDI windstorm certification (WPI-8) applies here
Calhoun 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 Calhoun County
Steel is only half the job — the concrete under it is the other half. Gulf Coast soils are typically soft coastal clay and sand with a high water table. Slabs here usually need a thicker turned-down edge, more reinforcement, and sometimes select fill — the concrete line item runs higher than the Texas average, and a soils report is money well spent. 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.