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Coastal cover

Windstorm cover, TWIA, and the certificate a coastal reroof needs

On designated coastal territory, wind and hail are often not in your homeowners policy at all, and new roofing work has to be inspected and certified for the windstorm cover to attach to it. Both of those facts are invisible until they matter, and both of them are decided by your address rather than by your carrier.

The designated catastrophe area, precisely

The Commissioner of Insurance designates a catastrophe area along the coast. It currently covers all 14 first-tier coastal counties, and parts of Harris County east of Highway 146. In that territory a standard homeowners policy frequently excludes wind and hail, and the cover comes from a separate windstorm policy instead.

Of the eight counties this site covers, three are first-tier coastal counties and are inside the designated area: Galveston, Chambers and Brazoria. Harris County is in it only east of Highway 146 — TDI names La Porte, Morgan’s Point, Pasadena, Seabrook and Shore Acres as the Harris County cities affected. Fort Bend, Montgomery, Waller and Austin counties are not in the designated area, and neither is the great majority of Harris County, including most of the city of Houston.

This distinction is worth getting right rather than roughly right, because it decides which policy pays for your roof and whether your reroof needs an inspection. TDI publishes county maps of the designated area, and your agent can confirm your specific address. Do not take a contractor’s word for which side of the line you are on.

How TWIA fits in

The Texas Windstorm Insurance Association is the windstorm insurer of last resort for the designated area: cover for wind and hail for property owners who cannot get it from the ordinary market. It is not a first choice and it is not meant to be. TWIA publishes its coverage and eligibility rules, and the requirements are set by statute rather than by the association.

To be eligible for a TWIA policy, in summary:

  • The property must be in the designated area — the 14 first-tier coastal counties, or Harris County east of Highway 146.
  • You must have been turned down for wind and hail cover by at least one authorized insurer actively writing it in the designated area.
  • The property must be certified as built to the applicable building codes, by TDI or by TWIA, with limited exceptions. That is the certificate of compliance discussed below.
  • Properties in certain coastal flood zones built or substantially altered after a date set in the rules must also carry flood insurance.
  • The property must be in insurable condition — in good repair, with no unrepaired damage. TWIA inspects, physically or from aerial imagery, and can reassess a policy at any time.

You cannot buy a TWIA policy once there is a hurricane in the Gulf. TDI states it plainly: do not wait until the last minute. Buying wind and hail cover in June is a different transaction from trying to buy it when a system has a name.

The WPI-8 certificate of compliance

This is the part that touches a roofing job directly, and it is the part most often discovered late. In the designated area, most new construction, roof replacements, major repairs and other alterations require an inspection and a certificate of compliance confirming the work meets the applicable windstorm building code. TDI issues the certificates.

CertificateWhat it is forWho can inspect
WPI-8Construction inspected while the work is under wayAn engineer appointed by TDI, or a TDI windstorm inspector
WPI-8-EConstruction already completedA Texas licensed professional engineer. Harder to do on a finished assembly, and TDI notes it may cost more
WPI-8-CHistoric. Certificates TWIA issued for work completed between January 2017 and May 2020Looked up through TWIA rather than TDI

The practical sequence is therefore: establish whether the address is in the designated area, establish whether the scope needs an inspection, arrange the inspection as part of the job, and confirm the certificate was issued before the job is closed out. TDI’s own advice on making repairs after a storm is blunt about the last step: do not make your final payment until the certificate of compliance has been issued for the work performed.

What does and does not need an inspection

TDI publishes the list, and the general shape of it is that structural work needs a certificate and cosmetic or small work does not. Roof replacement is on the structural side. Among the examples of work that does not require an inspection:

  • Roof repairs of less than 100 square feet that do not involve the decking.
  • Painting, carpeting, cabinets and other non-structural items.
  • Repair or replacement of fences, gutters, decorative shutters, steps and screen doors.
  • Plumbing and electrical repairs.
  • Replacement of glass in windows or doors.

Note the first one carefully, because it is the line a coastal repair sits on: under 100 square feet and not touching the deck. A repair that grows once the roof is open can cross that line, and it is better to know in advance than to find out afterwards.

You can check whether a property already has a certificate. TDI runs a searchable register of WPI-8 and WPI-8-E certificates, and TWIA has a lookup for the older WPI-8-C ones. It is a useful thing to do before you buy a coastal house, not only before you reroof one. Verified as of September 24, 2026. We re-check these pages quarterly.

What this means for a roofing conversation

  1. Ask, early, whether your address is in the designated area. Your agent knows. TDI’s county maps confirm it.
  2. Ask the contractor how they will meet the inspection requirement and get a certificate. TDI’s guidance tells homeowners to ask this specifically, and a contractor unfamiliar with the windstorm inspection program is a warning sign on the coast.
  3. Get the product side right too. Windstorm compliance depends on the materials as well as the workmanship, and TDI maintains published product evaluations for the designated area. A product that cannot be certified cannot be part of a certified roof.
  4. Hold the final payment until the certificate has been issued.
  5. Keep the certificate. It is part of the house now, and the next owner’s insurer will want to know it exists.

And if you are inland — which most of this service area is — none of the above applies to you, and your wind and hail cover is in your homeowners policy with a deductible that is probably a percentage of your dwelling limit.

On the coast and planning a reroof? Get the scope and the inspection sequence settled first.

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Is windstorm insurance required in Texas?

Not by law. TDI states that windstorm cover is not required by statute, but that if you live near the coast and have a mortgage your lender will very likely require it. That is the practical requirement most coastal homeowners are actually responding to.

Do I have to use TWIA if I am in the designated area?

No. TWIA is the insurer of last resort, and eligibility depends on having been turned down by at least one authorized insurer writing wind and hail cover in the area. Ask your agent what is available in the ordinary market first.

How long do I have to file a TWIA claim?

TDI states that you have one year from the storm to file a TWIA claim, and that once TWIA has accepted a claim you have 60 days to dispute the amount and ask TWIA for an appraisal. Those are published TWIA rules rather than general Texas policy terms, so they apply if your wind cover is a TWIA policy. Check your own policy either way.

I live in Houston. Does any of this affect me?

Almost certainly not, unless you are east of Highway 146 — the designated part of Harris County covers cities like La Porte, Morgan’s Point, Pasadena, Seabrook and Shore Acres. For the rest of Harris County, and for Fort Bend, Montgomery, Waller and Austin counties, wind and hail cover sits in the homeowners policy and no windstorm certificate is required. Confirm your own address rather than assuming from the mailing city, which in this metro is frequently not the jurisdiction.

What happens if a previous owner reroofed without a certificate?

It is worth finding out before it becomes your problem, because the certificate affects eligibility for windstorm cover on the property. The TDI register is searchable by property. Where work was done without certification, a licensed professional engineer can inspect completed construction for a WPI-8-E, though TDI notes that inspecting a finished structure is harder and can cost more than inspecting one in progress.

All work is performed by insured local roofing professionals. Texas does not license roofing contractors at state level, so insurance, references and a written scope are what there is to check.

SheetArticle
Service areaGreater Houston and the Texas Gulf Coast
Last reviewed24 September 2026