Direct Answer
If you repair, replace, or recover more than 25% of an existing roof or roof section within a 12-month period, Florida’s 25% rule can trigger additional requirements under the Florida Building Code. The key provision is Florida Building Code, Existing Building, Section 706.1.1. The 2023 Florida Building Commission code analysis identifies this section as the “25 percent rule (existing roofing).”
Under the 2023 code provision, generally no more than 25% of the total roof area or roof section may be repaired, replaced, or recovered in any 12-month period unless the applicable requirements for the existing roofing system or roof section are satisfied. Importantly, the code includes an exception for certain existing roofs that were permitted and installed in compliance with the Florida Building Code or the two previous versions.
Who This Applies To
This information is useful for Florida homeowners, commercial property owners, property managers, facility managers, contractors, roofing contractors, architects, and building officials dealing with existing roof repairs or replacement.
Not for: Assuming that exceeding 25% automatically means the entire roof must be replaced in every situation. The existing roof’s compliance history, applicable code edition, roof section, and project scope must be evaluated.
1. Where Is the Official 25% Rule Located?
The primary provision is:
Florida Building Code, Existing Building — Section 706.1.1, 25 Percent Rule (Existing Roofing).
The official Florida Building Commission’s 2023 code material identifies Section 706.1.1 and states that no more than 25% of the total roof area or roof section may generally be repaired, replaced, or recovered within a 12-month period unless the applicable requirements are met.
Official Florida Building Commission – Section 706.1.1 Roofing Code Document
2. What Does Section 706.1.1 Say?
The 2023 Florida Building Commission document identifies Section 706.1.1 as follows:
“Not more than 25 percent of the total roof area or roof section” of an existing building or structure may generally be repaired, replaced, or recovered in any 12-month period unless the applicable requirements are satisfied.
The same provision includes an exception stating that replacement of the entire existing roof or roof section is not required when the existing roof covering was permitted and installed in compliance with the applicable code or the two previous versions of the Florida Building Code.
3. The Rule Applies to More Than Just Roof Replacement
One important point for your FAQ is that the 25% rule is not limited to a complete reroof. The 2023 Florida Building Commission analysis specifically explains that Section 706.1.1 was revised so that, when the 25% rule is triggered, it applies to roof replacement and roof recover as well as repair.
Therefore, the project should be evaluated based on what portion of the applicable roof area or roof section is being repaired, replaced, or recovered.
4. Does Exceeding 25% Always Mean the Entire Roof Must Be Replaced?
No. This is one of the most important points to explain accurately.
The 2023 Section 706.1.1 provision contains an exception for an existing roof covering that was permitted and installed in compliance with the applicable code or the two previous versions of the Florida Building Code. When that exception applies, replacement of the entire existing roof or roof section is not required under the provision.
Florida Statutes provide an additional statutory provision. Section 553.844(5) states that when an existing roofing system or roof section was built, repaired, or replaced in compliance with the 2007 Florida Building Code or a subsequent edition, and 25% or more is being repaired, replaced, or recovered, only the repaired, replaced, or recovered portion is required to be constructed in accordance with the Florida Building Code in effect, as applicable.
5. Why the Existing Roof’s History Matters
Before deciding that a project requires a complete reroof, review:
- The date the existing roof was installed.
- The permit associated with the existing roof.
- Previous roof repairs or replacements.
- The applicable Florida Building Code edition when the roof was installed.
- The total roof area or applicable roof section.
- The amount of work performed during the previous 12 months.
- The proposed repair, replacement, or recovery area.
- Whether the existing roof qualifies for the applicable exception.
6. How Is the 25% Threshold Calculated?
The basic calculation is straightforward:
Applicable roof area × 25% = 25% threshold
For example, if the applicable roof section is 10,000 square feet:
- Total roof section = 10,000 sq. ft.
- 25% threshold = 2,500 sq. ft.
- Proposed work = 2,000 sq. ft. → below 25%
- Proposed work = 3,000 sq. ft. → above 25%
However, the calculation should not be treated as the only issue. The definition of the applicable roof section, related work, previous work within the 12-month period, existing roof compliance, and applicable exceptions can affect the analysis.
7. Florida Building Commission Interpretations Can Also Matter
The Florida Building Commission maintains a database of declaratory statements and interpretations. For example, an official Roofing Technical Advisory Committee interpretation addressed whether certain work required to tie repaired areas into unrepaired roof areas should be counted toward the 25% threshold. The interpretation concluded that certain related tie-off work was not counted toward the threshold under the circumstances presented.
This demonstrates why unusual or disputed projects should not be evaluated solely by multiplying the roof area by 25%.
8. Where Can You Verify the Current Florida Building Code?
The Florida Building Commission’s Florida Building Code Online portal provides access to the state’s code resources, including the 2023 Florida Building Code and materials associated with the 2026 update. The Commission identifies December 31, 2023 as the effective date of the 8th Edition (2023) Florida Building Code.
Official Florida Building Code Online
You can also use the Commission’s search system to find declaratory statements, interpretations, and other code-related documents by section number, including 706.1.1.
Official Florida Building Commission Code Search
Bottom Line
The official Florida Building Code reference for the 25% roof rule is Florida Building Code, Existing Building, Section 706.1.1. For the 2023 code, the Florida Building Commission’s official documentation identifies this as the “25 percent rule (existing roofing).”
However, avoid stating that “more than 25% automatically means the entire roof must be replaced.” The applicable exception and Florida Statutes §553.844(5) can change how the rule applies to an existing, code-compliant roofing system.
Related Questions
- Does the 25% rule apply if the damage is from a hurricane?
- What happens if I try to repair more than 25% without a full re-roof permit?
- Should I repair or replace my commercial roof?
- When is it better to replace a commercial roof rather than repair it?
Sources
- Florida Building Commission – 2023 FBC Roofing Detail Report, Section 706.1.1
- Florida Building Commission – Analysis of Changes, 8th Edition (2023), Existing Building
- Florida Statutes §553.844(5) – Existing Roofing Systems
- Florida Building Code Online – Official Florida Building Commission Portal
- Florida Building Commission – Declaratory Statement and Interpretation Search
Last reviewed: October 2026
Related Resources
Use the official Florida Building Commission resources to verify the applicable code edition, roofing provisions, declaratory statements, and interpretations before finalizing a roof repair or replacement scope.
Need Commercial Roofing Help?
ShieldLine Roofing can help evaluate the existing roof, document the proposed repair area, and develop a roofing scope for review against applicable Florida requirements.
Disclaimer: This information is provided for general educational purposes and does not constitute legal, permitting, engineering, insurance, or building-code advice. The applicable requirements can depend on the property, roof section, existing roof history, code edition, jurisdiction, and project scope.
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