How the rule works in practice
Say a storm damages a third of your roof. Because that exceeds 25%, the code generally requires the whole roof — not just the damaged section — to be brought to current HVHZ standards. At that point, a full replacement is often more cost-effective than a partial repair plus code upgrades.
The post-2009 exemption
If your roof was permitted after March 1, 2009, it likely already meets a recent code edition, so a repair under 25% can usually proceed without a full-roof upgrade. Pulling your permit history tells you where you stand — something we check during a free inspection.
Related roofing services
Frequently asked questions
It applies to most repairs that affect more than a quarter of the roof within 12 months, unless your roof was permitted after March 1, 2009. A free inspection plus a quick permit-history check confirms whether it applies to you.