Florida Building Code (FBC) requires windows to meet strict standards for wind resistance, impact protection, and emergency egress. Specific criteria mandate impact resistance, dictate replacement limits, and govern safe bedroom exit routes.
The 25% Rule: If you replace over 25% of your home's glazed openings (windows/doors) within 12 months, all those new openings must meet current FBC impact/protection standards, even in non-HVHZ areas, say some sources.
The Florida Building Code (FBC) requires windows to be impact-resistant or protected if located within one mile of the coast where the wind speed is 110 mph or greater.
The Florida 25% Window Rule
This rule states that if you are replacing 25% or more of the windows in your home, the new windows must comply with the current building code requirements. This means they need to be impact-resistant if you live in a designated area, and they must meet energy efficiency standards.
In Florida, window replacement is regulated construction work. In most cases, a permit is required, regardless of whether the homeowner or a contractor performs the installation. Before beginning any project, it is essential to: Confirm permit requirements with your local building department.
In Florida, getting caught remodeling without a permit typically results in a Stop Work Order halting all construction immediately, a requirement to obtain a retroactive permit (often at a penalty fee multiplier), fines that accrue until the violation is resolved, and in some cases a lien recorded against the property.
Florida Building Code 25% Reroofing Rule
Not more than 25 percent of the total roof area or roof section of any existing building or structure shall be repaired, replaced or recovered in any 12-month period unless the entire roofing system or roof section conforms to requirements of this code.
Owners of any site-built single-family residential property in Florida are eligible to apply for up to $10,000 in state funding to protect their homes from damaging hurricane winds. The state program provides $2 for every $1 spent to replace roofs and structures, exterior and garage doors and windows.
Building permits and inspections are necessary to assure and document that important safety regulations are being complied with. Windows, glazing and/or fenestration require building permits per the California Building Code (CBC) Sec. 105.1, California Residential Code (CRC) Sec. 105.1 and County Building Code, Sec.
Meanwhile, the 9th Edition is already in development with adoption expected by December 31, 2026. Whether you're building single-family homes, commercial properties, or multifamily developments, these updates directly affect your plan approvals, engineering requirements, and project timelines.
According to building codes in California, you will need a permit: If you're replacing more than 75 square feet of windows. New windows must meet specific efficiency standards. The maximum U-factor should be 0.40, and the maximum Solar Heat Gain Coefficient (SHGC) should be 0.23.
Do I need a permit to replace my own windows in Florida? Yes, a permit is required for window replacement, even if you do the work yourself. This ensures compliance with local codes and hurricane standards. Without a permit, you may run into issues when selling your home.
In Florida, window replacement projects are governed by strict building code regulations designed to ensure safety, energy efficiency, and structural integrity. The Florida Building Code (FBC) states that most window replacements require a permit, especially in regions prone to hurricanes and severe weather.
Technically, there is no single law that says every single house in the state of Florida must have impact windows. However, the Florida Building Code (FBC) essentially mandates "opening protection" for homes in high-risk areas. This means you must have either impact-resistant windows or a code-approved shutter system.
The Bottom Line
While DIY window replacement is possible for those with advanced carpentry skills, most homeowners will benefit from professional installation. Remember: even the highest-quality replacement window won't perform properly if it's not installed correctly.
Work that does not require a permit is typically cosmetic, such as:
Top 10 Common Building Code Violations (and How to Avoid Them)
Florida Statute 90.408 prohibits offers to compromise or settle a claim from being used as evidence in court. This rule allows both sides to negotiate openly without fear that those discussions will later be used at trial.
The Florida Building Code, 8th Edition (2023) is now in effect.
Do you need planning permission for windows? (Updated for 2026) If you're simply replacing windows in a similar style and size used on the build of the house, you DON'T need to apply for planning permission. If you want to add new windows then in some cases you DO need planning permission.
Installing an AC unit isn't just a technical job. It's a legal one, too. Most municipalities require permits for HVAC work, and failing to obtain them can result in fines or forced removal. You'll also need to follow strict building codes and EPA regulations, especially when handling refrigerants.
The 25% Rule in roofing serves as a guideline for both homeowners and contractors when planning roofing projects. Basically, it means that if more than 25% of your roof's surface needs repairs, it's often wiser to contemplate a full replacement rather than patchwork.
Federal tax credits make energy-efficient window upgrades more affordable for Florida homeowners. You can claim 30% of qualifying window costs, up to $600 per year, through December 31, 2025.
Florida's largest down payment assistance program rewards the workers who serve our communities. Teachers, nurses, first responders, and 50+ more professions can receive up to $35,000 toward their first home.
Meanwhile, the highest-rated hurricane windows can protect against winds up to 175 MPH. Specifically, these windows undergo extensive testing where large projectiles are launched at high speeds. Consequently, premium hurricane windows provide protection even during the most severe Category 5 events.