{"id":10674,"date":"2026-11-04T09:51:42","date_gmt":"2026-11-04T09:51:42","guid":{"rendered":"https:\/\/aspsuperhome.com\/guides\/impact-windows\/what-is-the-25-percent-rule-for-windows-in-florida\/"},"modified":"2026-11-05T07:27:49","modified_gmt":"2026-11-05T07:27:49","slug":"what-is-the-25-percent-rule-for-windows-in-florida","status":"publish","type":"page","link":"https:\/\/aspsuperhome.com\/guides\/impact-windows\/what-is-the-25-percent-rule-for-windows-in-florida\/","title":{"rendered":"25 Percent Rule for Windows in Florida: Plain Guide"},"content":{"rendered":"\n
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South Florida Home Improvement | Windows & Roofing<\/p>

The 25 Percent Rule for Windows in Florida, Explained Plainly<\/h1>
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By Jonathan Rodriguez \u00b7 Published November 4, 2026<\/p>\n\n

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The 25 percent rule you may have read about is a roofing rule, not a window rule. In Florida law, the 25 percent threshold applies when an existing roof built, repaired, or replaced under the 2007 Florida Building Code or a later edition has 25 percent or more repaired, replaced, or recovered. Window replacement follows a different set of conditions. This guide explains each one in plain terms.<\/p>\n

The Short Answer: What the 25 Percent Rule Means for Windows<\/h2>\n

The 25 percent figure in Florida law applies to roofs, not windows. The Florida windstorm loss mitigation law<\/a> says that if an existing roofing system was built or replaced under the 2007 Florida Building Code or a later edition, and 25 percent or more of it is being repaired, replaced or recovered, only that portion must meet the code in effect.<\/p>\n

The rule is about proportion. It asks what share of the roof is being worked on. It does not ask how much the whole home is worth or how much the job costs.<\/p>\n

Window work is judged differently. The Florida Building Code lists specific conditions for replacing windows and doors. Those conditions focus on size, location, wind zone and design pressure. The sections below walk through each one.<\/p>\n\n

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Where the Threshold Comes From: The Florida Building Code<\/h2>\n

The Florida Building Code is the statewide rulebook that local building departments use. The Florida Building Code statute<\/a> says the code covers the design, construction, alteration, repair and demolition of buildings, and how those rules are enforced.<\/p>\n

Existing buildings get their own treatment. Repairs and alterations to an older home are handled differently from brand-new construction. The 2026 Florida Building Code analysis of changes<\/a> says that section points to Chapter 14 and Chapter 7 so flashing requirements are met.<\/p>\n

You can see that exact language in the Florida Building Code supplement<\/a>.<\/p>\n

How Window Replacement Is Measured Under the Code<\/h2>\n

Under Section 107.1.1, sealed drawings by a design professional are not required for replacing windows, doors, or garage doors in an existing one-family or two-family dwelling or townhouse when the listed conditions are met (source<\/a>). The exception applies when all of the following conditions are met (source<\/a>):<\/p>\n