What Makes French Doors Different
French doors are double-door systems where both panels are hinged and operable, swinging open to create a wide, symmetrical opening. Unlike sliding glass doors (where one panel slides behind a fixed panel), French doors swing open entirely, creating a clear opening equal to the full width of both panels.
This makes them architecturally distinctive and functionally appealing for patio access, pool areas, master bedroom exits, and formal living spaces. It also makes them structurally unique among hurricane-rated openings because both panels must resist wind loads independently, and the junction where the two panels meet (the astragal) is a potential weak point that doesn't exist on single doors or sliding systems.
Getting a hurricane-rated French door right means understanding the swing direction, the locking system, the glass options, and the specific products available for your wind zone.
In-Swing vs. Out-Swing: The Most Important Decision
This is the structural decision that most affects your French door's hurricane performance, and many homeowners don't realize it matters until their installer explains it.
Out-Swing (Recommended for Florida)
The door panels swing outward, away from the interior. During a hurricane, wind pushing against the door from outside presses the panels into the frame, compressing the weatherstripping and creating a tighter seal as wind speed increases. The harder the wind pushes, the tighter the door seals.
The frame acts as a stop: the door physically cannot be pushed open by wind because the wind pressure drives it into the frame. The locking system supplements this natural resistance rather than being the sole defense against the wind.
Advantages:
- Better wind resistance (wind pushes door into frame)
- Tighter seal under pressure (weatherstripping compresses more)
- Locking system is a secondary defense, not the primary one
- Required or recommended by many Florida installers
Disadvantages:
- Requires exterior clearance for the swing arc (panels swing outward 90 degrees)
- Threshold is exposed to rain when door is open
- Screen or storm door must be inward-opening (can be awkward)
In-Swing
The door panels swing inward, into the interior. During a hurricane, wind pushing against the door from outside tries to push the panels away from the frame. The locking system must resist this pressure entirely. If the locks fail, the door blows open.
Advantages:
- No exterior clearance needed
- Threshold is protected from rain when door is open
- Easier to add exterior screen doors
Disadvantages:
- Wind pressure works against the locking system
- The door's wind resistance depends entirely on the lock hardware
- More demanding on multipoint locking systems
- Requires higher-rated locks for equivalent wind protection
Bottom line: For Florida hurricane zones, out-swing French doors are the standard recommendation. Most impact-rated French door products designed for the Florida market are out-swing by default. If you prefer in-swing for architectural reasons, verify that the locking system is rated for your zone's full design pressure.
Multipoint Locking: Why It's Non-Negotiable
French doors have two panels meeting at the center of the opening. The active panel (the one you open first) operates normally with a handle and lock. The inactive panel (the second panel) is typically secured with flush bolts at the top and bottom that pin it to the frame and threshold.
During a hurricane, wind pressure pushes across the full surface of both panels. If the locking points are concentrated in one area (like a single deadbolt on the active panel and two flush bolts on the inactive), the door can bow between the lock points, breaking the seal and eventually failing.
Multipoint locking systems distribute 3 to 5 lock points along the full height of each panel:
| Lock Configuration | Active Panel | Inactive Panel | Best For |
|---|---|---|---|
| Standard (minimum) | 3-point (deadbolt + top/bottom hooks) | 2-point (top/bottom flush bolts) | Standard residential, moderate DP |
| Enhanced | 4-point (deadbolt + 3 hooks/bolts) | 2-3 point (flush bolts + mid-height) | Higher DP, HVHZ |
| Premium | 5-point (full perimeter) | 3-point (top/mid/bottom) | Maximum security and DP |
ECO's Series 950 French door uses a 4-point active / 2-point inactive configuration and is Miami-Dade approved, making it one of the strongest French door locking systems on the Florida market.
The inactive panel matters. Some lower-cost French doors treat the inactive panel as semi-fixed, with minimal locking. In a hurricane, both panels face equal wind loads. If the inactive panel's flush bolts are undersized or poorly engaged, it becomes the failure point. Verify that both panels have independently rated, code-compliant locking hardware.
Glass Options
French doors are available in several glass configurations, all using impact-rated laminated glass (the same technology used in impact windows):
Full-Lite (Most Popular for French Doors)
Glass panels spanning nearly the full height and width of each door panel, with minimal frame visible. This maximizes light and creates the open, airy aesthetic that makes French doors appealing. The glass is structural laminated glass meeting TAS 201/203 or ASTM E1996/E1886 testing.
Divided Lites
Simulated or true divided lites create a grid pattern over the glass surface, evoking traditional French door aesthetics. Simulated divided lites (SDL) use applied grids on the surface of a single glass panel, maintaining the impact rating of the full glass sheet. True divided lites (TDL) use separate glass panes in individual frame sections, which can affect structural performance. For impact applications, SDL is preferred because the continuous glass sheet maintains its full impact rating.
Half-Lite
Glass in the upper portion, solid panel in the lower portion. Less common for French doors (full-lite is the defining aesthetic), but available for homeowners who want more privacy or lower cost per panel.
Decorative Glass
Textured, frosted, rain glass, etched patterns, and wrought iron accents between glass lites. These treatments are applied to impact-rated laminated glass and do not reduce the hurricane protection level. Popular in Mediterranean and traditional-style homes.
Pricing
| Configuration | Price Range (Installed) | Notes |
|---|---|---|
| French door pair, standard width (5-6 ft opening) | $4,000-$6,000 | Most common residential |
| French door pair, wide (6-8 ft opening) | $5,000-$8,000 | Wider panels, higher DP required |
| French door pair + 1 sidelight | $5,500-$9,000 | Sidelight must be separately impact-rated |
| French door pair + 2 sidelights | $7,000-$12,000 | Common for formal entries and patio access |
| French door pair + transom | $5,500-$9,000 | Transom must be impact-rated |
| French door pair, arched top | $7,000-$12,000+ | Custom; premium pricing |
Prices vary by frame material (aluminum is standard for impact French doors; fiberglass is available from some manufacturers), glass configuration, locking hardware tier, and whether the product carries a Miami-Dade NOA (10-20% premium over standard Florida Product Approval). For complete pricing across all window and door types, see our impact windows cost guide.
French Doors vs. Sliding Glass Doors
For patio and pool access, homeowners often choose between French doors and sliding glass doors. Here's how they compare:
| Factor | Impact French Doors | Impact Sliding Glass Doors |
|---|---|---|
| Clear opening | Full width (both panels swing open) | Partial (one panel slides, others fixed) |
| Cost (6-8 ft opening) | $5,000-$8,000 | $3,500-$6,000 |
| Maximum width | 8 ft typical (wider with sidelights) | 40 ft (multi-panel, multi-track) |
| Clearance needed | Yes (swing arc interior or exterior) | No (panels slide within frame) |
| Aesthetics | Classic, symmetrical, formal | Clean, modern, minimal |
| Water intrusion risk | Lower (no track system) | Higher (track gaps, documented by FIU) |
| Ease of use daily | Open both panels, walk through | Slide one panel, step over track |
| Best for | Formal entries, master bedrooms, courtyard access | Family rooms, lanais, large wall openings |
French doors have a lower water intrusion risk than sliding glass doors because they don't have a track system with inherent gaps. The hinge-and-seal system of a French door, when properly weatherstripped, provides a tighter seal under wind-driven rain conditions. This is one reason French doors are preferred for bedrooms and formal living spaces where even minimal water intrusion is unacceptable.
Hurricane Shutters for Existing French Doors
If you have non-impact French doors and a full replacement exceeds your budget, code-approved hurricane shutters are an alternative:
- Accordion shutters: $600-$1,500 per opening. Permanent mount beside the doors. Close in 15-30 minutes.
- Roll-down shutters: $1,200-$3,000 per opening. Housing above the doors. Deploy in under 5 minutes.
- Storm panels: $300-$600 per opening. Removable. Require 30-60 minutes to install.
For detailed shutter pricing, see our hurricane shutters cost guide.
Shutters meet the opening-protection requirement and qualify for insurance credits when all openings are protected. The trade-off: no daily benefits and deployment required before every storm. For the full comparison, see our impact windows vs. hurricane shutters guide.
Top Manufacturers
ECO Window Systems Series 950
Miami-Dade approved. 4-point active / 2-point inactive multipoint locking. Impact-rated laminated glass. Available in single and double configurations. The strongest locking system among Florida-market impact French doors. Budget-friendly pricing consistent with ECO's position as the most affordable major manufacturer.
ECO Window Systems Series 600/650
Standard residential French door configurations. Florida Product Approval with impact rating. Lower DP than the 950 Series but adequate for most WBDR applications. The value option for non-HVHZ installations.
ES Windows Elite EL300
French/swing door with 1-3/4" panel depth and integrated sidelite options. DP-rated for HVHZ applications. Low-E and Kynar/Dynar coatings included standard (no upcharge). 5-6 week delivery. Approximately 20% less expensive than comparable PGT products.
PGT WinGuard
French door configurations available in both aluminum and vinyl frames. WinGuard Aluminum offers higher DP ratings for HVHZ. WinGuard Vinyl provides better insulation at lower cost for WBDR applications. Broadest dealer network in Florida.
WinDoor Estate
Premium/luxury French door with ogee glazing beads, stainless steel hardware package, and the highest design pressure ratings in the residential market. Estate Bifold configurations allow multiple panels to fold and stack for a fully open wall. Specified for luxury waterfront homes and resort properties.
Installation Considerations
Structural header. Wide French door openings (6-8+ feet) require an engineered header to carry the wall and roof loads. In retrofit installations, verify the existing header is adequate.
Swing clearance. Out-swing doors need unobstructed exterior clearance equal to the panel width (typically 30-36 inches per panel). In-swing doors need the same clearance inside. Furniture, planters, and walkways must accommodate the swing arc.
Threshold and sill pan. French doors use a raised threshold between the panels. A sill pan beneath the threshold is recommended to manage any water that penetrates the seal. Flush-sill (ADA-compliant) options are available but require more careful waterproofing.
Astragal. The vertical member where the two panels meet when closed. On impact-rated French doors, the astragal integrates weatherstripping and receives the inactive panel's flush bolts. A poorly designed astragal is a potential water intrusion and air infiltration point. Verify that the astragal design is included in the product's impact certification.
Permits. French door installation requires a building permit in virtually all Florida jurisdictions. In the HVHZ, the product must carry a Miami-Dade NOA. In the WBDR, a Florida Product Approval with impact rating is required.
Next Steps
- Get a free estimate for impact French doors matched to your opening and wind zone, with options across manufacturers and glass configurations.
- Specify out-swing and multipoint locking in your request. These are the two most important performance features.
- Compare against sliding glass doors if you're deciding between the two for patio access.
- Check MSFH eligibility for grants up to $10,000 covering impact doors and other improvements. Financing options including PACE ($0 down, no credit check) are also available.
- For the full door product lineup, see our impact doors page covering entry, sliding glass, French, and pivot configurations.
