Licensed, bonded & insuredOpen daily 7 AM–11 PMCall (347) 888-9591
Call (347) 888-9591

Roof Repair vs Replacement: What Is the 25% Rule?

When should you repair a roof and when should you replace it? The 25% rule explained, plus the signs that repairs no longer make sense.

By [author name, role] · Updated [date]

Short answer: The 25% rule is a commonly cited building-code rule of thumb: if more than about 25% of a roof is repaired or replaced within 12 months, the entire roof may have to be brought up to current code. Practically, if repairs keep spreading across the roof, replacement is usually the better investment. Requirements vary by jurisdiction, so ask your roofer what applies in NYC.
In this guide
  • When a repair is enough
  • When to replace

When a repair is enough

  • Damage is limited to one area
  • The rest of the roof is in good condition
  • Insulation and decking are dry

When to replace

  • Leaks keep returning in new places
  • Widespread blisters, cracks or missing shingles
  • Wet insulation or soft decking
  • Repair costs approach a large share of replacement cost

Get an answer for your roof

Every roof is different. Call (347) 888-9591 or request a free estimate. Related services: Roof Repair · Roof Replacement · Roof Inspection.

Frequently Asked Questions

Should a 20-year-old roof be replaced?

Not automatically. If an inspection shows it is still sound, maintenance and targeted repairs may be enough.

Are flat roofs more expensive to repair?

Not necessarily. Small flat-roof repairs are often straightforward; costs rise when water has spread into insulation under the membrane.

Have a leak or a roof question? Talk to a roofer today.

Open 7 days, 7 AM–11 PM. Free, no-obligation estimates.

Call (347) 888-9591Request an Estimate