Do structures in Seabrook, La Porte, and Baytown require TWIA windstorm certification?

Those inside the TDI designated catastrophe area — generally the Harris County coastal portion east of SH 146 — do. New roofs, additions, and remodels on those properties need a WPI-8 certificate (or WPI-8E for completed work) for TWIA windstorm and hail coverage, the same as neighboring Galveston County. The designated boundary is property-specific, so verify the exact address with TDI records — we check it free when you call.

How do I know if my Harris County property is in the designated area?

TDI maintains the designated catastrophe area boundaries, and eligibility is confirmed property by property. Call us with the address — we verify against TDI records at no cost before you commit to an inspection. Properties just west of SH 146 are often outside the line, and paying for certification you do not need is a mistake we would rather prevent than profit from.

How quickly can you inspect a project near Baytown or La Porte?

Standard service is about 14 days from deposit to TDI submission; rush service is 5 days with next-day inspection available. Contractors running multiple corridor jobs can book a season of inspections in advance so stages are never covered before they are seen.

Windstorm Engineer Harris County East of SH 146

Windstorm Engineer for Harris County — East of SH 146

Quick Answer

The TDI designated catastrophe area in Harris County covers the southeastern coastal portion — generally the area east of State Highway 146, including Seabrook, La Porte, Baytown, and Pasadena. Structures there typically need TDI WPI-8 certification for TWIA windstorm and hail insurance. Our licensed engineers inspect and certify projects across this corridor.

Why the SH 146 line matters

Most of Harris County is inland — but its southeastern edge is coastal Texas. TDI’s designated catastrophe area for Harris County covers that southeastern portion, the corridor east of SH 146 where Galveston Bay meets the ship channel: Seabrook, La Porte, Morgan’s Point, the bayfront edges of Pasadena, and Baytown. Properties inside the designated area follow the same rules as Galveston County next door: no certificate, no TWIA windstorm coverage. Properties just outside the line do not — which is why we verify the exact address before quoting.

Do structures in this corridor really need certification?

Yes — when they are inside the designated boundary. Homes and commercial buildings in Seabrook, La Porte, and Baytown within the designated area need a WPI-8 (or WPI-8E for finished work) for new roofs, additions, and remodels, exactly like Galveston or Brazoria County. Lenders financing bayfront properties require windstorm coverage, and TWIA requires the certificate — so a missing WPI-8 can stall a sale anywhere along the corridor.

What we do along the corridor

For property owners and contractors east of 146, we provide the full windstorm program:

Address verification against TDI designated-area records — free, before you spend anything.
WPI-8 appointments and staged inspections for re-roofs, additions, and new construction.
Retroactive WPI-8E evaluations for finished work that was never certified.
Rush service — 5 days to TDI submission with next-day inspection — for closing and renewal deadlines.

Scheduling and pricing

Residential re-roof certification starts at $500 plus about $0.12 per square foot, with new construction from $1,000; commercial projects start at $800. Standard turnaround is about 14 days from deposit to TDI submission. Call the corridor line at (281) 528-4098 with the property address and we will confirm whether it is inside the designated area and quote the project on the spot.