Impact windows are not a Florida-only product anymore. After Hurricane Harvey, multiple Texas carriers added wind-mitigation discounts that include impact-rated glazing, and the insurance math has finally caught up to the install cost in coastal Houston neighborhoods. Here is the actual decision tree we walk customers through.
- What is an impact window?
- A laminated glass window assembly tested to ASTM E1996 (large missile impact) and ASTM E1886 (cyclic pressure), commonly with PVB or SentryGlas interlayer between two glass panes.
- What does it cost?
- Premium impact windows in Houston run $950 to $1,650 installed per window. A 14-window retrofit on a typical home is $14k to $23k installed.
- Will it pay back?
- Texas wind/hail insurance discounts for impact glazing range from 5 to 22 percent. On a $3,800 annual premium that's $190 to $836 per year. Combined with avoided board-up costs and reduced UV fading, payback runs 12 to 22 years for most homes.
01 // How impact windows actually work
An impact window is two pieces of glass with a structural plastic interlayer (PVB or SentryGlas) bonded between them. When struck by a 9-pound 2x4 at 50 ft/s (the ASTM E1996 large missile test), the outer glass shatters but stays bonded to the interlayer, which absorbs the impact and prevents penetration. The window is then subjected to 9,000 cycles of pressure differential simulating sustained hurricane winds. Pass both, you get the impact rating.
02 // Impact glass vs shutters
Plywood and storm panels are cheaper for hurricane protection but require deployment hours before the storm and storage afterward. Accordion or roll-down shutters cost $35 to $75 per square foot installed and need annual maintenance. Impact glass is permanent, requires zero deployment, and provides daily benefits (UV blocking, sound attenuation, security) that shutters do not. For owner-occupied homes we recommend impact glass; for vacation properties, shutters can be the right call.
03 // The Texas insurance discount math
Major Texas carriers offering impact-glazing wind/hail discounts as of 2026 include State Farm, Allstate, USAA, Travelers, and Texas Farm Bureau. Discounts range from 5 percent (whole-house upgrade required) to 22 percent (combined with impact-rated roof and reinforced garage door). To claim the discount you submit the manufacturer NOA (Notice of Acceptance) certificates and an installer affidavit. Ask your carrier for the specific paperwork before you install.
04 // Energy and UV performance
Modern impact windows are also typically Low-E coated and argon-filled, hitting U-factors of 0.28 to 0.32 and SHGC of 0.20 to 0.28. That's premium energy performance regardless of the impact rating. The PVB interlayer also blocks 99 percent of UV, which extends the life of hardwood floors, leather furniture, and artwork. We measure 5 to 12 percent cooling savings on whole-house impact retrofits in Houston.
05 // What a proper install looks like
Impact windows are heavier (typically 7 to 10 lb/sq ft vs 3 to 4 for standard double-pane) and the buck system has to be specified for the load. We use 1/4 inch Tapcon anchors at 16 inches OC into a structural buck (PT lumber or steel), with backer rod and dual-bead silicone seal. A premium window in a bad install fails the same way a cheap window does. Verify your installer has the manufacturer's installation training certificate.
