Impact Windows for Historic Homes in Florida
How to navigate preservation board approval, get the right Certificate of Appropriateness, and choose impact windows that match your home's historic character — without sacrificing storm protection.
Key Facts for Historic Home Owners
Why Historic Home Impact Window Installation Is More Complex
Florida law requires impact-rated windows in HVHZ counties (Miami-Dade, Broward) — but historic preservation law requires that changes to designated properties preserve their architectural character. These two mandates sometimes conflict.
The resolution: modern impact windows can be custom-fabricated to replicate historic profiles. Manufacturers like PGT, ESW, and specialty historic window companies produce impact-rated windows with profiles that match original 1920s–1960s Florida architecture.
What Usually Gets Approved
- ✓Windows matching original size, shape, and proportions
- ✓Simulated Divided Lites (SDL) matching original grid pattern
- ✓Aluminum frames in original color or matching anodized finish
- ✓Same opening type (casement stays casement, single-hung stays single-hung)
- ✓Same or closer exterior profile width to original
- ✓Period-appropriate muntin spacing and proportions
What Typically Gets Denied
- ✗Changing window type (e.g., casement to sliding)
- ✗Significantly larger or smaller openings
- ✗Wide modern frames that visually differ from originals
- ✗Eliminating original divided light pattern entirely
- ✗Non-period frame colors (e.g., dark bronze on Art Deco)
- ✗Vinyl frames on Mediterranean Revival or Art Deco homes
City-by-City Preservation Board Guide
Palm Beach TownExtremely Strict↓
Most stringent in South Florida. The LPC reviews exact profile measurements and requires custom-fabricated windows that precisely replicate originals. Expect 4–8 week approval process. Recommend hiring a preservation architect.
Miami BeachVery Strict↓
HPB requires exact architectural character matching. Art Deco windows typically have steel casements with geometric proportions — modern aluminum impact equivalents are available but must match the original's visual proportions exactly. Stucco and glass block windows have special requirements.
Coral GablesStrict↓
Coral Gables focuses on Mediterranean Revival character. Steel casements are common originals. Impact casements with matching profiles are generally approved. The City Beautiful aesthetic prioritizes arch shapes, proportional windows, and warm frame tones.
HollywoodModerate↓
Hollywood's board requires COA for contributing structures. Replacement windows must maintain original architectural character. Standard-profile aluminum impact windows are often approved if they match size and opening type. Less custom fabrication typically required vs Palm Beach.
Fort LauderdaleModerate↓
Fort Lauderdale's preservation board is less restrictive than Palm Beach or Miami Beach. Standard impact windows with matching configurations are usually approved in most districts. Custom profiles may be required for highest-rated contributing structures.
West Palm BeachModerate↓
West Palm Beach has several designated historic districts with varying requirements. Impact windows matching original proportions and materials are typically approved. Vinyl may be rejected in higher-contributing areas.
How to Get a Certificate of Appropriateness (COA)
Determine if Your Property Is Designated
Not all old Florida homes are in historic districts. Check your city's GIS portal or call the building department. Properties must be either: (a) in a designated historic district, or (b) individually designated as a local landmark. Both require COA for exterior changes.
Research Original Window Profiles
Pull old photographs, architectural drawings, or building permits showing original windows. Match: frame material (wood, steel, aluminum), opening configuration (single-hung, casement, awning), grid pattern (divided lites, plain, colonial), frame width, and color. The closer your proposed replacement matches, the faster approval comes.
Select Impact Windows with Matching Profiles
Work with a contractor experienced in historic impact windows. PGT, ESW, and specialty fabricators offer SDL (Simulated Divided Lite) options with custom muntin patterns. For steel casements, aluminum impact casements with thin profiles (1-3/4" or less) are the closest modern equivalent.
Prepare COA Application Package
Submit to your city's preservation office: (1) Photos of existing windows, (2) Manufacturer product specifications showing profiles and dimensions, (3) Sample photos of proposed windows installed on comparable historic homes, (4) Written description explaining how the replacement matches the original character. Some boards also want window samples.
Attend Board Meeting (If Required)
Minor changes may get staff-level approval (administrative COA). Larger projects typically go before the full preservation board at a scheduled public meeting. Bring your contractor, product samples, and photos. Boards meet monthly in most cities.
Get Building Permit with COA
Once the COA is issued, apply for the building permit with the COA attached. The building department won't process a permit for exterior historic property changes without it. After permit approval, installation proceeds normally with a final inspection.
Window Profile Options for Historic Florida Homes
| Window Type | Historic Style | Modern Impact Equivalent | Approval Difficulty | Cost Premium |
|---|---|---|---|---|
| Steel casement with divided lites | Art Deco, Mediterranean | Thin-profile aluminum casement with SDL | Moderate | +40–60% |
| Wood double-hung with colonial grids | Craftsman, Bungalow | Aluminum double-hung with SDL grids | Easy–Moderate | +30–50% |
| Jalousie / louvered | 1950s–60s Florida Modern | Single-hung or awning impact (profile match) | Difficult | +50–80% |
| Arched window openings | Mediterranean Revival | Custom radius-top impact unit | Moderate (if arch matched) | +60–100% |
| Plain single-hung, no grids | Art Moderne, Mid-Century | Standard impact single-hung (close match) | Easy | +5–20% |
SDL = Simulated Divided Lites — decorative grilles applied to glass to replicate multi-pane appearance without structural dividers.
What If the Preservation Board Denies Impact Window Replacement?
Denial happens when boards feel the proposed replacement changes the architectural character too much. You have several options:
Option 1: Appeal with Professional Design Drawings
Hire a preservation architect to create measured drawings comparing original windows vs. proposed replacement. Boards approve appeals significantly more often when applicants show quantitative evidence the profiles match. Cost: $500–$2,000 for drawings.
Option 2: Approved Exterior Shutter Systems
If the board requires preserving original windows, add exterior hurricane protection: Bahama shutters, Bermuda shutters, or accordion shutters in styles approved for your district. Historic boards in Palm Beach and Miami Beach have pre-approved shutter styles. Original windows remain; hurricane protection is layered on top.
Option 3: Interior Safety Film + Shutters
Apply 3M or Llumar safety film to existing glass (reduces breakage and flying glass inside) combined with approved exterior shutters. This maintains original appearance 100%. The limitation: film alone is NOT code-compliant for HVHZ storm protection and does NOT qualify for insurance discounts.
Option 4: Interior Storm Panels
Some preservation boards allow transparent interior storm panels that mount inside the existing window opening and are completely invisible from outside. These preserve the exterior appearance while adding impact protection. FPA-certified interior panels qualify for code compliance in some jurisdictions. Ask your local building department.
Do Historic Impact Windows Still Qualify for Insurance Discounts?
Yes — the insurance discount is based on the FPA/NOA certification of the window, not its profile or appearance. As long as the impact windows are certified to Florida Product Approval or Miami-Dade NOA standards, you qualify for the same 25–45% windstorm premium reduction.
What You Need for the Insurance Discount
- 1. All exterior openings protected with FPA/NOA-certified impact windows or shutters
- 2. Wind mitigation inspection by licensed contractor, engineer, or architect
- 3. Completed OIR-B1-1802 form (Florida's standard wind mitigation form)
- 4. Photos of installed windows showing manufacturer labels
- 5. Building permit and Certificate of Completion from building department
- 6. Submit OIR-B1-1802 to your insurer and request premium review
Historic Home Impact Window Cost in South Florida (2026)
| Window Configuration | Standard Impact (WSM) | Historic Custom Impact | Premium Over Standard |
|---|---|---|---|
| Small window (24"×36"), plain | $280–$400 | $380–$550 | +25–40% |
| Medium window (30"×48") with SDL grid | $350–$500 | $520–$750 | +40–60% |
| Large picture window (48"×60"), plain | $600–$900 | $850–$1,300 | +40–50% |
| Casement with Art Deco steel-look profile | $400–$600 | $650–$1,100 | +50–80% |
| Radius-top arched window (custom) | N/A | $900–$2,000+ | Custom only |
Installed prices including labor. Windows Stock Market offers in-stock standard impact windows at 30–60% below retail; custom historic profiles are manufactured to order and priced separately. Call for a historic home estimate.
Frequently Asked Questions
Can you put impact windows in a historic home in Florida?↓
What is a Certificate of Appropriateness (COA) and do I need one?↓
How much more do impact windows cost for historic homes?↓
What if the preservation board won't approve impact window replacement?↓
Which Florida cities have the strictest historic preservation rules for windows?↓
Do impact windows in historic homes qualify for insurance discounts?↓
Historic Home in South Florida? Let's Get Your Windows Right.
Vieser Construction has experience navigating preservation board approvals in Broward, Miami-Dade, and Palm Beach counties. We'll recommend the right products, handle permitting, and help you put together a COA application package.
Licensed Florida Contractor · Preservation Board Experience · All Broward & Miami-Dade Counties