Roof Replacement: signs, materials and the replacement process for homeowners
A roof replacement means taking off the old roofing down to the wood deck, fixing any bad wood and putting on a new roof: underlayment, flashing, vents and the finish material. You need one when repairs keep coming back, when leaks show up in more than one spot or when the shingles are worn out across the whole roof, not just in one corner.
Below: the signs it is time, how the common materials compare, what happens on the job, what moves the price and what to ask a roofer before you sign. Contractor Palace matches you with one independent local pro. The pro does the work and you pay the pro directly.
Signs you need a replacement roof, starting on the south side.
In the United States, the south and west facing slopes of a roof take the most direct sun. Heat and sunlight dry out asphalt shingles, so those slopes usually show wear first. Check them first, from the ground with binoculars. Do not climb up.
Roof repair cost or residential roof replacement: which makes sense?
Repair makes sense when the damage is in one area and the rest of the roof is in good shape. A few blown off shingles, a cracked pipe boot or loose flashing around a chimney are classic repairs.
Replacing the roof makes more sense when problems are spread across the roof, when you would be patching new shingles onto old ones that no longer match or when repairs keep adding up. Ask the pro to price both options so you can compare. Our roof repair cost guide explains how repairs are usually priced.
How to choose a roof: asphalt, metal, composite and flat roof options.
The material changes the price, how long the new roof lasts, how heavy it is and how many local crews know how to put it on. Your roof shape matters too: some materials only work on steep roofs, and flat roofs need their own systems. Choose based on your budget, roof size and local weather, because the options available in your area differ and the most common choice is not always the best fit. Each material also has its own lifespan, maintenance needs and energy performance, so it helps to ask for a durable choice based on how long you plan to stay.
Asphalt shingles
The most common choice on American homes. Lower up front cost, many colors and lots of crews that install them. Architectural shingles are thicker than basic three tab ones. The trade off is a shorter life than metal, tile or slate.
Metal
Standing seam panels and metal shingles cost more up front but usually last much longer and shed snow well. Metal reflects more heat, especially in light colors. Ask how many metal roofs the crew has installed.
Tile and slate
Clay, concrete and slate can last a very long time and look great, but they are heavy. Your roof framing must be able to carry the weight, so ask the pro to check before you commit.
Flat roof systems
Low slope roofs use membranes such as TPO, EPDM rubber or modified bitumen instead of shingles. Good drainage is everything on a flat roof, so ask how the pro will keep water from sitting in low spots.
Roof replacement, roof layers and the tear off.
Some roofers offer to lay new shingles right over the old layer. That skips the tear off and can lower the price, but it has real downsides. Nobody gets to see the wood deck, so rot stays hidden. The roof gets heavier. And many building codes limit how many layers a roof can have, so your next roofer may have to remove two layers instead of one. On older homes, ask whether the old roofing could contain asbestos before it comes off. The EPA explains asbestos in old roofing.
A complete tear off lets the pro inspect every board, replace the soft ones, put down fresh underlayment and install new flashing at walls, chimneys and valleys. Flashing and underlayment are what actually keep water out; the shingles are the first line of defense, not the only one.
Also ask about ventilation. An attic that cannot breathe traps heat and moisture, which can shorten the life of a new roof and lead to ice dams in cold climates. The roof is open anyway, so it is a good time for sealing and insulating the attic.
A step by step guide to the residential roof replacement process, from inspection to installation.
Inspection and estimate. The roofer looks at the roof, the attic and the gutters, measures the roof and writes up the scope. Roofers price by the square, which is 100 square feet of roof.
Permit and materials. The pro pulls the permit if your city needs one and orders materials. A dumpster shows up around the start date.
Protect the house. Tarps cover plants, the siding and the driveway. Ask how the team will protect your AC unit and anything near the walls.
Tear off and deck repair. Old shingles and underlayment come off. Soft or rotten boards are replaced. This is where surprise costs show up, so agree on the price per board before work starts.
Underlayment, flashing and edges. Ice and water barrier goes at eaves and valleys where your climate calls for it, then underlayment, drip edge and new flashing.
Install the new roof. Shingles or panels go on from the bottom up, then ridge caps and vents.
Cleanup and final walk. A magnet sweep picks up nails in the yard and driveway. Walk the job with the pro, get photos of the deck and flashing work and wait for the final inspection before the last payment.
What happens on a roof replacement and what changes the scope of the job in your area.
These factors change how big the job is and how long it takes:
- Size. More squares means more material and more labor.
- Pitch. Steep roofs need safety gear and work slower.
- Shape. Valleys, dormers, skylights and chimneys all add cutting and flashing.
- Material. Metal, tile and slate cost more than asphalt shingles.
- Layers. Each old layer to tear off adds labor and disposal.
- Deck repair. Rotten wood is unknown until the old roof is off.
- Where you live. Labor rates, permit fees and local codes vary a lot by area.
- Season. Busy months mean longer waits and less room to negotiate.
For typical prices, read our roof replacement cost guide. The number to plan around is a written estimate from a local professional who has measured your roof.
How to read a roofing estimate from a professional contractor.
Whether you get one estimate or three, compare them line by line and make sure each one is complete. A clear estimate should name:
- Roof size in squares and the number of layers coming off
- The shingle or panel brand, product line and color
- Underlayment, ice barrier, drip edge and flashing work
- How the roof will vent
- The price per sheet of replaced decking
- Permit, dumpster and cleanup
- Start date, rough length and payment schedule
- What written coverage the pro and the material maker offer, and for how long
A complete estimate helps ensure you compare like with like, and the average homeowner finds that far easier with two or three on the table. A quality material and an experienced crew can cost more, so weigh the whole scope and not only the price. If one price is far lower than the rest, look for what is missing. It is often the tear off, the flashing or the deck repair. Our guide to comparing roofing quotes shows how to line them up.
How to choose a roofing company and compare their services: questions to ask the experts.
Some roofers only do shingle roofs. Others also handle metal, flat roofs, gutters and skylights. Pick a company whose everyday work matches your job, one that can provide references from a past customer, then ask these questions.
Can I see your license and proof of insurance?
Ask the pro for their license and proof of insurance. Roofing license rules differ by state and city, so check with your state contractor board. Insurance matters because a fall or damage to your home during the job should not land on you.
Who will be on my roof, and who is in charge each day?
Some companies use their own team and others hire subcontractors. Either can work. Get a name and a phone number for the person running the job.
Will you tear off the old roof and check the deck?
Get the answer in writing, along with the price for any boards that need replacing.
How do you handle payment?
Tie payments to finished stages of work. Be careful with anyone who wants most of the money before the job starts.
How to read reviews. Read the middle reviews on Google and other sites, not just the five stars, and see how the company answered a customer complaint. A good roofing company replies calmly.
Red flags. Someone knocking on your door right after bad weather. Pressure to sign today. Cash only. No written estimate. No local address.
Roof replacement FAQ: questions homeowners ask.
How do I compare two roofing estimates?
Make sure both list the same scope: the same squares, layers coming off, material, underlayment, flashing, ventilation and deck repair terms. Book outside the busy season if you can, when roofers have more open days.
How is flat roof replacement different?
Flat and low slope roofs use a membrane and the insulation under it instead of shingles, and the details around drains, vents and edges matter more. A flat roof over a garage and a full commercial style roof are very different jobs. A written estimate from a pro who has been up on your roof is the only plan worth following.
How does a metal roof compare with shingles?
Metal panels take special tools and skill to install, and metal tends to last longer and needs less upkeep than asphalt shingles. Ask the pro to put both options on the same estimate so you can compare them line by line.
Do I need a permit to replace my roof?
In many cities, yes. Rules depend on your city or county, not on the roofer. Call your local building department or check its website, and ask the pro who will pull the permit and when the inspection happens.
Can I stay home during a roof replacement?
Most people do. Expect loud hammering, dust in the attic and nails in the yard. Keep pets inside, move cars out of the driveway and take fragile items off the walls.
How long does a roof replacement take?
A simple roof on an average home is often done in a few days. Big, steep or cut up roofs take longer, and so does any job where rotten decking turns up. Rain and wind can pause the work. Ask the pro for a start date and a plan for bad weather in writing.
Get matched with one local roofing pro.
Tell us about your roof and what you are seeing. Contractor Palace matches you with one independent local pro who looks at the job and gives you an estimate. The pro does the work and you pay the pro directly. You can also read more about our roofing service first.