How to Tell If You Need a New Roof

Updated 2026-10-24 · Sources checked

"leaked from backed out fasteners and we have stained drywall and trusses"

One commenter described a leak that way. Waiting too long is one fear. Paying to get a new roof put on when you don't need one is the other.

One bad sign is usually a repair, and widespread signs point to replacement. What matters is how much of the roof is affected: a new roof, rather than patching, is recommended when more than 10% of the old roof needs repair¹. That is a roofing-trade rule of thumb, not a building code.

Quick answer:

Look from the ground for curled, loose or missing shingles², and check the gutters for shingle granules.
Check the attic and ceilings for water stains, drip trails or light coming through³.
Note how much of the roof the signs cover, and take dated photos.
Get more than one bid before you sign anything.

On this page

What to check from the ground and the attic
Repair or replace: how much of the roof counts
Does a leak change the timing?
What about insurance and the 25% rule?
How to avoid being sold a roof you don't need
How much does a new roof cost?
Quick questions

Everything below can be done from the ground, the attic and inside the house, with a phone camera.

What to check from the ground and the attic

Stay off the roof: unless you are experienced, roof repair is a job for a professional roofer⁴. Binoculars from the ground and a flashlight in the attic are enough, so you don't have to go up there.

Ground (asphalt shingles): curled, loose or missing shingles, especially along the edges². On asphalt, curling or splitting is evidence of deterioration⁵.
Gutters: granules, the coated rocks on a shingle's surface. Heavy loss matters because they protect the fiberglass from damaging UV rays⁶.
Attic: water stains on the rafters and insulation³, and a drip trail or a spot of light coming through⁴.
Inside: stains and discoloration on ceilings and interior walls³.
Record: dated photos and a note of how much of the roof is affected. They show a roofer, and an insurer if one gets involved, how far it has spread.

Repair or replace: how much of the roof counts

Isolated damage is usually a repair. The method depends on the kind of roofing and the extent of the leak, and missing shingles are replaced and holes repaired⁴.

That is why the 10% rule of thumb¹ is useful. If your list of problems adds up to more than that, replacement is worth pricing next to repair. A qualified roofer should be able to show you which parts are damaged and how much of the roof that is.

A sensible order:

Check from the ground, the attic and inside, and take dated photos.
Note how much of the roof the signs cover.
If you might file a claim, read your policy for the deductible (what you pay before insurance pays) and have your questions ready⁷ before you call your insurer.
Get more than one written bid, then decide.

If you do replace it, what does the process look like? The roof replacement process and what to get in writing.

Does a leak change the timing?

Yes. A wet spot should not sit, because in most cases mold will not grow if wet or damp materials are dried 24-48 hours after a leak⁸.

Water coming in: put a bucket under it and move belongings out of the way.
Photograph the wet area first, then dry what got wet.
If you're trying to get a leak fixed and a roofer can't come today, keep catching and drying the water, and look again from the ground and the attic after the next rain.

Does a leak mean a repair is enough, or is it time to replace? Whether your roof needs repair or replacement.

What about insurance and the 25% rule?

An old roof can limit your options: some insurers may decline to write new policies for homes with older roofs⁹. Practices differ from one insurer to another⁹, so check your own policy.

One commenter put the worry this way: "Your insurance company will tell you when it’s time to replace, right after they send a drone over it." What you can do is ask. When you call about damage, ask about coverage, how long you have to file, and whether the claim will exceed your deductible⁷.

The "25% rule" is a Florida building-code rule. In Florida, when 25 percent or more of a roof built, repaired or replaced under the 2007 Florida Building Code or later is being repaired, replaced or recovered, only that portion must meet the code¹⁰. It says which part of the work must meet code, not when a roof needs replacing. Elsewhere, ask your local building department.

How to avoid being sold a roof you don't need

Get more than one bid or repair estimate: comparing them helps show which offers are too high or too good to be true¹¹. A commenter planning their own replacement said it in fewer words: "We're planning on replacing the roof in a few weeks but definitely shop around."

Being asked to pay for everything up front, or to pay only in cash, is a warning sign¹². Ask each roofer to show you a photo of every problem they want to fix and to say how much of the roof it covers. If one bid says repair and another says replace all of it, ask each to explain why. Also ask each roofer to put the payment schedule in writing, so you can see what you pay at each stage of the work. You can send this:

Please put your payment schedule in writing, with what I pay at each stage. Please also list each problem you found and the work planned for it.

Wasn't planning for this expense and unsure how to cover it? How to pay for a new roof without enough saved.

How much does a new roof cost?

It depends on the type of roof, its size and the damage, so there is no figure here. Ask for a written quote that names each problem found and the work planned for it, so you can compare bids line by line.

Quick questions

How old is too old for a roof? A year count alone won't tell you. Go by condition: how many of the signs above you find, and how far across the roof they spread.

Is $50,000 for a new roof good? A second bid helps show which offers are too high or too good to be true¹¹. Ask what the figure covers and which problems it fixes.

Can I fix a few shingles myself? Repairs happen on the roof, and the guidance is to hire a professional unless you are experienced. Ask a roofer to price a repair of the damaged area next to a full replacement.

What if I can't afford to do a complete replacement? Ask for both prices in writing. If the damage is isolated, a repair quote shows what the smaller job would cost.