What structural windstorm certifications are required for commercial buildings along the Texas Gulf Coast?

Commercial structures in TDI-designated catastrophe areas need a Certificate of Compliance for windstorm insurability: a WPI-8 when the engineer inspects during construction, or a WPI-8E for work that was already completed without staged inspections. TDI-appointed qualified engineers perform the plan review, staged inspections, and evaluations, and file the certificate with the state. Without it, TWIA will generally not bind windstorm and hail coverage on the property.

Do TDI inspections replace city or county commercial inspections?

No. The windstorm certification is a state compliance program on top of your municipal permit inspections — the city checks code generally; the TDI-appointed engineer verifies windstorm-specific construction standards and files the state certificate. You still pull your local permits as usual; we coordinate with your build schedule so both inspection tracks move together.

How fast can you certify a commercial roof?

Standard turnaround is about 14 days from deposit to TDI submission; rush service compresses it to 5 days with next-day inspection available. For multi-building programs we run a phased schedule across sites so your whole portfolio moves at once.

Commercial Windstorm Engineering Services in Texas

Quick Answer

Commercial buildings in TDI-designated catastrophe areas along the Texas Gulf Coast need a Certificate of Compliance — WPI-8 during construction or WPI-8E for completed work — to be insurable for windstorm and hail. Our licensed engineers handle plan review, staged inspections, structural evaluations, and certification for retail, industrial, warehouse, and multifamily projects.

What commercial projects need certification

Any commercial structure in a designated catastrophe area — new build, re-roof, expansion, or major remodel — is in scope of the TDI windstorm inspection program. Typical projects we certify include strip centers and retail buildings, warehouses and distribution buildings, industrial and manufacturing facilities, offices, hotels, and multifamily residential. If the property needs TWIA windstorm coverage at any point, it needs the certificate.

Our commercial services

We support commercial projects at every stage:

Plan review before construction — confirming the design documents satisfy TDI windstorm building standards before problems get built.
Staged WPI-8 inspections during construction — foundations, framing, connections, roofing, opening protection — with WPI-2 reports filed at each stage.
Structural evaluations for completed or unpermitted work, including testing and engineering analysis on the WPI-8E path.
Remediation plans when evaluations find deficiencies — a defined correction scope your contractor can bid and execute.
Multi-site and phased programs for GCs and developers certifying several properties on one schedule.

Commercial pricing

Commercial certification carries higher base rates than residential because the structures are larger and the standards more demanding. Current commercial rates: re-roofing from $800 plus $0.20/sq ft; small detached structures from $500 plus $0.20/sq ft; small attached exterior projects from $800; major remodeling from $1,200 plus $0.20/sq ft; new construction from $1,200 plus $0.20/sq ft. Rush service (5 days to TDI submission) adds a flat $500; completed-construction surcharges run $400–$1,000.

Why contractors keep us on speed dial

A missed inspection stage on a commercial roof can mean tearing out finished work — we schedule around your build sequence so stages are inspected before they are covered. A missing certificate can block a certificate of occupancy or a closing — our rush path exists for exactly that. And because we are appointed qualified engineers, our filings go straight to TDI with no re-work loop.