Free Roofing Tool
Roof Repair vs. Replacement Calculator
Enter your repair cost, estimated replacement cost, roof age, and how many years a repair will last. Get a data-driven repair-or-replace recommendation with cost-per-year analysis.
Build Roofing Proposals That CloseShould I Repair or Replace My Roof?
Adjust the sliders to match your situation. The recommendation updates instantly based on the rule-of-50% and remaining-life analysis.
Full roof replacement estimate.
How many more years the repair buys.
Recommendation
Borderline — lean toward replacing
- Repair cost is only 25% of replacement — cost-effective
- Roof is past 60% of expected lifespan
- Repair extends life by 7 years — short runway
Repair cost/year
$500
Replace cost/year
$560
Repair % of replace
25%
Yrs left on roof
9 yr
This is a planning tool only. A licensed roofing contractor should inspect your roof in person to assess the true scope of damage, remaining structural integrity, and the best course of action for your specific situation.
How to Decide: Repair or Replace?
Apply the rule of 50%
If the repair cost exceeds 50% of full roof replacement cost, most roofing professionals recommend replacing the roof. You're spending half the cost of a new roof while still keeping an aging roof that will need full replacement within a few years. At 30% or below, repair is typically the right call.
Consider how old the roof is
A 5-year-old roof with a major repair need is very different from a 22-year-old roof with the same repair. A young roof has decades of service life remaining — repair makes sense. An older roof past 75% of its expected lifespan is likely to need full replacement within a few years regardless.
Calculate cost per year
Divide the repair cost by the number of years the repair is expected to last. Compare that to the replacement cost divided by the new roof's full lifespan (typically 25 years). If the cost per year is similar, replacement often wins because you get a full warranty and peace of mind.
Factor in insurance and financing
Storm damage may be covered by homeowner's insurance, changing the financial picture significantly. For a full replacement, roofing financing at 0% for 12–18 months can make replacement cash-flow neutral. Get multiple quotes and ask your contractor about financing options before deciding.
Signs You Need to Replace, Not Repair
Widespread granule loss
Asphalt shingles protect the roof via embedded granules. When granules wash off at scale — gutters full of grit, patchy bald spots — the shingles are near end of life. A single repair won't fix systemic granule loss.
Multiple layers already installed
Most jurisdictions allow two layers of asphalt shingles. If your roof already has two layers, a third is not permitted — full tear-off and replacement is the only option for the next project.
Widespread curling or cupping
Shingles that curl at the edges (cupping) or in the middle (clawing) are past their useful life. This pattern across multiple roof planes is a clear replacement signal.
Deck damage or rot
If the plywood or OSB sheathing beneath the shingles has moisture damage, rot, or soft spots, no surface repair will fix the problem. Deck replacement is required, which usually makes full reroof more economical.
Repeated leaks in the same area
A roof that has been repaired in the same area two or more times is telling you something. Repeated leaks in the same location often signal systemic flashing failure, deck degradation, or a design issue that patching cannot permanently resolve.
Roof age + storm damage combination
An aging roof with storm damage is often a replacement candidate even if the storm damage alone seems minor. Most insurance adjusters and roofing contractors will recommend a full replacement if storm damage combines with age over 15–20 years.
Are You a Roofing Contractor? Help Homeowners Decide on the Spot
SubcontractorHub lets your crew build repair vs. replacement proposals with good-better-best options, financing, and digital signature right at the home — so homeowners can decide with confidence.
See How It WorksRepair vs. replace proposals in minutes
Good-better-best pricing options
Insurance claim documentation support
Monthly financing presented at the door
E-signature and same-day close
Roof Repair vs. Replacement FAQ
When should you repair vs. replace a roof?
Repair when damage is isolated, the roof is under 15–18 years old, repair cost is under 30% of replacement, and the repair will last 5–10+ years. Replace when repair cost exceeds 50% of replacement, the roof is over 20 years old, damage is widespread, or you've had repeated repairs in the same area.
What is the rule of 50% for roof repair?
If repair costs exceed 50% of full replacement cost, most roofing professionals recommend replacing instead. You'd be spending half the cost of a new roof while still keeping an aging roof that will need full replacement within a few years.
How long does a roof repair last?
A quality repair on a sound roof can last 10+ years. Repairs on an aging roof with widespread deterioration tend to last 2–5 years before another repair or full replacement is needed. The expected repair life is a key input in this calculator's recommendation.
How much does a roof repair cost?
Minor repairs run $150–$600. Mid-size repairs (a full section or valley) cost $600–$2,500. Major repairs covering large areas cost $2,500–$8,000 and often approach replacement territory on a cost-per-year basis.
Does homeowner's insurance cover roof repair?
Insurance typically covers sudden storm or impact damage (hail, wind, falling trees) but not wear and gradual deterioration. If storm damage is the cause, your insurer will assess whether repair or replacement is warranted. Your roofing contractor can help document damage for an insurance claim.
How long does a typical asphalt shingle roof last?
3-tab shingles last 20–25 years; architectural shingles last 25–30 years; premium architectural 30–40 years. Climate, ventilation, installation quality, and maintenance all affect actual lifespan. Impact-resistant shingles can significantly extend life in hail-prone areas.
What signs indicate my roof needs to be replaced?
Replace if you see widespread curling, significant granule loss, two layers already installed, deck rot or soft spots, repeated leaks in the same area, or a roof over 20 years old experiencing active leaks. A professional inspection will identify issues not visible from the ground.
Should I fix my roof before selling?
Yes — a sound roof is a major selling point and typically returns its cost in sale price. Active leaks and visible damage give buyers negotiating leverage and can kill deals during inspection. At minimum, repair active leaks and address anything that will show up on an inspection report.
Roofing Contractors: Close More Same-Day
SubcontractorHub helps roofing contractors build proposals, present financing, and collect signatures on the spot — whether it's a repair or a full replacement.
Book a Free DemoAll calculations are estimates for planning purposes only and should be confirmed by a licensed roofing contractor with an on-site inspection.