When South Florida homeowners sit down at the kitchen table with a $7,500 homeowners insurance renewal bill and a limited home-improvement budget, one question comes up more than any other: impact windows vs new roof insurance savings—which project should you tackle first to slash your annual premium the fastest?
Both contractors will tell you their upgrade pays for itself. However, when you examine the actual actuarial tables filed with the Florida Office of Insurance Regulation (OIR) and the strict scoring rules of Form OIR-B1-1802 (Uniform Mitigation Verification Inspection Form), the math between impact windows vs new roof insurance savings reveals a clear strategic winner—along with a costly "All-or-Nothing" trap that catches thousands of window buyers by surprise.
In the battle of impact windows vs new roof insurance savings in Florida, replacing an older roof with a code-compliant system delivers nearly double the annual premium reduction ($2,100–$3,800/yr) compared to impact windows alone ($900–$1,900/yr). A new roof unlocks up to four separate credits on Form OIR-B1-1802 and restores eligibility with preferred carriers, whereas impact windows only affect Question 7 (Opening Protection) under a strict "All-or-Nothing" rule.
Establishes the seven mandatory wind mitigation inspection categories that govern residential windstorm premium discounts across all admitted Florida property insurance carriers.
How Form OIR-B1-1802 Scores a New Roof vs. Impact Windows
To understand why a roof replacement moves the needle so dramatically on your insurance bill in Jupiter, Boca Raton, or Stuart, look at the 7 questions on the official Florida Wind Mitigation Form:
- Question 1 (Building Code): Upgraded to FBC Compliant during reroof.
- Question 2 (Roof Covering): Upgraded to post-2002 FBC Equivalent (+12% to +20% wind credit).
- Question 3 (Roof Deck Attachment): Upgraded from staples/6d nails to Level C 8d ring-shank nails at 6" spacing during tear-off (+10% to +16% wind credit).
- Question 4 (Roof-to-Wall Attachment): Upgraded via a hurricane straps third nail retrofit while the perimeter deck is open (+18% to +35% wind credit).
- Question 5 (Roof Geometry): Hip vs. Non-Hip roof shape.
- Question 6 (Secondary Water Resistance - SWR): Upgraded by applying a self-adhered peel-and-stick underlayment directly to the wood deck (+8% to +12% wind credit).
- Question 7 (Opening Protection): Impact windows, doors, skylights, and garage doors (+15% to +28% wind credit).
Notice the asymmetry: 5 out of the 7 questions on Form OIR-B1-1802 are 100% roof-related! Only Question 7 applies to windows and doors.
The "All-or-Nothing" Trap in Question 7 (Opening Protection)
Here is the most painful mistake we see South Florida homeowners make when evaluating impact windows vs new roof insurance savings:
A homeowner spends $26,000 replacing all 14 windows and sliding glass doors on their home with Miami-Dade Large Missile Impact glass. They call a wind mitigation inspector expecting a $2,000/year insurance discount—and receive $0. Why?
- The 100% Glazed & Entry Door Rule: Under Form OIR-B1-1802 Question 7, to qualify for the Class A (Hurricane Protection) discount, every single glazed opening (windows, sliders, French doors, transoms, glass-block bathroom windows, and roof skylights) AND all solid exterior doors and garage doors must meet code!
- If you have an old non-impact skylight on your roof, or an older garage door without a Florida Product Approval sticker, your $26,000 window package is disqualified from the Class A Opening Protection tier until that skylight or garage door is also replaced!
- Furthermore, if your home already has aluminum accordion shutters or metal storm panels stored in the garage for every window, switching to impact glass gives you $0 additional wind mitigation discount—because storm shutters and impact glass receive the exact same Class A credit on Form OIR-B1-1802!
Head-to-Head Financial & Insurance Comparison ($6,500 Baseline Policy)
| Evaluation Metric | New FBC Roof + SWR + Strap Retrofit | Whole-Home Impact Windows & Doors | Strategic Takeaway |
|---|---|---|---|
| Typical Project Cost (2,400 sq. ft. Home) | $18,000 – $36,000 (Shingle / Tile / Metal) | $24,000 – $45,000 (15–20 openings + sliders) | Roof replacement has lower or equal entry cost |
| OIR-B1-1802 Questions Improved | Questions 2, 3, 4 & 6 (4 separate credits) | Question 7 Only (Opening Protection) | Roof captures 4x more form categories |
| Est. Annual Insurance Savings | $1,800 – $3,600 / year | $900 – $1,850 / year ($0 if you already had shutters) | New roof delivers ~2x higher annual savings |
| Carrier Underwriting Eligibility | Unlocks all preferred carriers (Resets roof age to 0) | None (Carriers still drop homes with 15+ yr roofs) | Windows cannot stop a roof-age non-renewal |
| Skylight Coordination Impact | Replaces old non-impact skylights during reroof | Old skylights disqualify window credit until reroofed | Always replace skylights during your reroof |
How to Model Your Exact Policy Savings in 60 Seconds
If your roof in West Palm Beach, Palm Beach Gardens, or Hobe Sound is over 12 years old, prioritizing your residential roof replacement (and replacing any non-impact skylights at the same time) protects your home from carrier non-renewal while capturing maximum multi-point discounts.
Test different combinations of roof deck nailing, peel-and-stick SWR barriers, hurricane straps, and opening protection right now on our free Florida Wind Mitigation Insurance Savings Calculator.
