Roof Repair vs. Roof Replacement: How to Know Which You Need

Repair when the damage is isolated, the roof is under about 15 years old, and the deck underneath is sound. Replace when the roof is near the end of its lifespan, the damage covers more than roughly a third of the surface, or you've already patched the same area more than once.

Five questions that usually settle it

1. How old is the roof?

Architectural asphalt shingles commonly last 20 to 30 years in Middle Tennessee; three-tab shingles 15 to 20. If your roof is inside five years of that window, money spent on repairs is money spent twice. Under 15 years and otherwise healthy, repair.

2. How much of the roof is affected?

A few wind-lifted shingles on one slope is a repair. Damage scattered across multiple slopes, or covering more than about a third of the roof, is a replacement — and patching it will look like a patchwork besides.

3. Is the deck still solid?

Sagging rooflines, soft spots underfoot, or daylight visible through the attic boards mean the plywood or planking is compromised. That's structural, and it means tearing off to fix properly.

4. Are the shingles simply worn out?

Look for bald patches where the granules are gone, widespread curling or cupping edges, cracking across many shingles, and granule buildup in your gutters. Those are aging, not damage, and aging isn't repairable.

5. Have you fixed this leak before?

A leak that returns after a repair usually means the flashing detail is wrong or the underlayment has failed over a larger area than the stain suggests. Two repairs in the same place is a signal to stop repairing.

Signs you need a roofer soon, either way

• Water stains on ceilings or upper walls, especially after wind-driven rain
• Missing, cracked or curling shingles visible from the ground
• Granules collecting in gutters and downspouts
• Daylight or damp insulation in the attic
• Flashing pulling away from a chimney, skylight or wall
• Sagging along the ridge or between rafters
• Moss or dark streaking across large areas

What each option costs

Isolated repairs in Middle Tennessee commonly run $400 to $1,800. Larger repairs involving flashing, valley rework or decking replacement run $1,500 to $4,500. A full replacement typically runs $9,000 to $18,000 for asphalt shingles on an average home. See our full roof cost breakdown for details by home size.

The math is straightforward: if the repair costs more than about 30% of a replacement and the roof has less than a third of its life left, replace it.

Storm damage is a special case

After hail or high wind, get a roofer's inspection and photograph everything before anyone touches the roof. Your insurer may cover repair or full replacement depending on the extent of the damage. Call your insurance company before signing any contract, and be wary of crews going door to door in the days after a storm — especially any that offer to cover your deductible.

What a good roof inspection includes

• Walk or drone survey of every slope, not a look from the driveway
• Attic check for moisture, staining, daylight and ventilation
• Assessment of flashing at chimneys, skylights, walls and valleys
• Photos of what they found, given to you
• A written recommendation with both options priced when both are viable

If a roofer won't show you photos of the damage they're describing, get another opinion.

Common questions

Can I just replace one slope of the roof?

Sometimes, when slopes are separated by a ridge and the shingles still match. Expect a visible color difference, since shingles fade.

Will a repair void my roof warranty?

Manufacturer material warranties usually survive a proper repair. Poor workmanship can void them, which is a reason to use a licensed, insured roofer rather than a handyman.

How long can I wait on a small leak?

Not long. Water spreads along framing and into insulation and drywall, so a small roof repair turns into a ceiling repair and a mold problem faster than most people expect.

Is an overlay — new shingles over old — a good idea?

Rarely. It hides deck problems, adds weight, traps heat, shortens the new roof's life, and many manufacturers won't warranty it.

Find a roofer near you

Browse roofing companies in Middle Tennessee, or start with Murfreesboro, Nashville, Hendersonville, or see all service areas.