What is the difference between a TWIA WPI-8-C and a TDI WPI-8 certificate?

A WPI-8-C is a legacy Certificate of Compliance issued under the former TWIA-administered inspection program; a WPI-8 is the certificate issued through today’s TDI windstorm inspection program for structures inspected during construction. New projects are certified with WPI-8 (ongoing) or WPI-8E (completed). An existing WPI-8-C generally remains valid evidence of compliance for TWIA eligibility, though you can confirm it with TDI if a party questions it.

Is my old WPI-8-C still valid for TWIA insurance?

Generally yes — a properly issued WPI-8-C remains evidence that the structure was certified under the program as it existed. If your insurer, a buyer, or a lender questions it, TDI can confirm the filing, or we can perform a current evaluation. Call us with the address and we will check what is on record before anything is spent.

How do I get a copy of an existing windstorm certificate for my property?

Certificates filed with the state are retrievable through TDI records. Requesting a copy from TDI is the first step; if the certificate was issued through our office we can often locate it faster. If nothing is on file, the retroactive WPI-8E evaluation is the standard route to document compliance.

TWIA WPI-8-C vs TDI WPI-8 Certificate: What’s the Difference?

TWIA WPI-8-C vs TDI WPI-8: What’s the Difference?

Quick Answer

A WPI-8-C is a legacy Certificate of Compliance issued under the former TWIA-administered inspection program, before the program moved under TDI administration. A WPI-8 is the certificate TDI issues today for structures inspected during construction. Both serve as evidence of windstorm compliance, but any new certification will be a WPI-8 or WPI-8E.

Where the two certificates came from

The windstorm inspection program has not always lived in the same place. Certificates labeled WPI-8-C trace to the era when the inspection and certification process was administered under TWIA — the Texas Windstorm Insurance Association. Under the current structure, TDI — the Texas Department of Insurance — administers the program, appoints the qualified engineers and inspectors, and issues the compliance certificates: WPI-8 for ongoing construction and WPI-8E for completed work. The forms, the appointed-engineer requirement, and the windstorm code standards are fundamentally the same idea; the issuer and the process changed.

Side-by-side comparison

The practical differences come down to who issued it, when, and for what:

Issuer: WPI-8-C — legacy program administered under TWIA. WPI-8 — issued through today’s TDI windstorm inspection program.
When issued: WPI-8-C — historical projects certified under the old program. WPI-8 — any current project, ongoing construction.
Completed work: the modern equivalent is the WPI-8E retrospective evaluation; there is no new WPI-8-C.
Insurance value: an existing WPI-8-C generally remains valid evidence of compliance for TWIA eligibility — but confirm with TDI or your insurer if it is being questioned at renewal or closing.

Which one do you actually need?

If your project is happening now — a re-roof, addition, or new build in a designated catastrophe area — the target is a WPI-8 (ongoing) or WPI-8E (already complete). Nobody issues a new WPI-8-C. If you already hold a WPI-8-C on an older structure and it is being accepted, you may not need to do anything. If a buyer, lender, or insurer is questioning a legacy certificate — sometimes the records predate easy digital verification — we can help locate the documentation or perform a current evaluation that puts the question to rest.

How to check what certificate you have

TDI maintains records of certificates filed with the state. If you are unsure what your property has on file — WPI-8-C, WPI-8, WPI-8E, or nothing at all — call us with the property address and we will help determine what documentation exists before you spend money on an inspection you may not need. Plenty of "missing certificate" problems turn out to be record-look-up problems, and those are free to solve.