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The Roof Replacement Process, Step by Step

  • Published November 7, 2026
  • The main guide of this topic

A roof replacement runs in six stages: inspection and contract, scheduling and preparing the house, tear-off, deck repair, building the new roof from the edges up, and cleanup with final inspection. Your decisions cluster at three points: signing the scope, approving deck repairs found at tear-off, and accepting the job before the final payment.

Everything else is the crew’s job. Each stage below says what you should see happen and links to the page that covers it in depth.

Stage 1: Inspection, Scope and Contract

The job starts with an inspection that sets the scope. The roofer should count the existing layers, check the deck from the attic for stains and soft spots, look at flashing, vents and gutters, and measure the roof. Ask for those findings in writing, with photos of the layer count and any problem areas, because they become the baseline the contract is priced against; the line items behind a replacement price follow from them. They also decide the method, and the first method question is whether new shingles can go over the old ones or everything must come off; overlay or tear-off covers the layer limit and the tradeoffs.

Approvals come next. A re-roof may need a building permit, and the permit questions to settle include who pulls it and which inspections follow. If you live under a homeowners association, HOA approval for a new roof may be required before any material is ordered.

Then the contract. The Federal Trade Commission’s How To Avoid a Home Improvement Scam (updated December 10, 2025) says to get the work, materials, completion date and price in writing, advises checking the contractor’s license with your state or county, and warns against paying the full amount up front; reading competing bids side by side shows how to hold each bid to that list. How the deposit and later payments should be tied to stages of the work is covered in setting a payment schedule before you sign. The roofing contract terms to look for include the method, the materials by name, a deck replacement price, permits, cleanup and warranty. If a bid uses a term you do not recognize, look it up in the plain definitions of estimate and contract terms before you sign. If an insurance claim is paying for the roof, the claim filing guide sets when to sign.

Stage 2: Scheduling and Preparing the House

Once the contract is signed, the start date depends on the crew’s calendar, material delivery and weather. Cold, wet or windy days limit what a crew can do, and weather limits on roofing work explains how temperature affects shingle sealing. What sets the length of the job, from roof size and pitch to layers and deck repairs, is covered in the guide to replacement timelines.

The house needs preparing before the first day. Vibration from tear-off shakes walls and the attic, debris falls along the eaves, and the driveway fills with a dumpster and material. The checklist for preparing your house covers the attic, wall hangings, vehicles, pets, children, neighbors and access.

Stage 3: Tear-Off and What It Can Reveal

With the house ready, the first work day starts at the top. On a tear-off, the crew strips the old roofing down to the deck and drops it into a dumpster or trailer. This is the loudest, messiest stage, and it is the one that shows what the old roof was hiding.

Older roofs carry a material risk. The EPA’s Learn About Asbestos page (updated July 13, 2026) lists roofing and siding shingles among building products that may contain asbestos, and notes that exposure “may occur only when the asbestos-containing material is disturbed or damaged in some way.” Tear-off disturbs it by design, so if your roof is old enough to raise the question, test before the job starts; asbestos in old roofing explains testing and removal rules. On houses built before 1978, painted fascia and trim raise a similar question about lead, covered in lead-safe roof projects.

The debris has to go somewhere. The Asphalt Roofing Manufacturers Association’s page on asphalt shingle recycling (May 17, 2026) states that “the primary use of recycled shingles is to make roads.” Whether your shingles can be recycled locally, and who is responsible for disposal, is covered in shingle disposal and recycling.

Tear-off also puts the crew at the roof edge with loose debris underfoot. Fall protection on roofing jobs describes what you should see on site, and ladder safety covers the ladders crews and homeowners use.

Stage 4: Deck Repair and the Change-Order Moment

With the old roofing off, the deck is visible for the first time since the last re-roof. Soft, delaminated or rotted sheathing has to be replaced before anything new goes down, because nails will not hold in it.

This is where the contract earns its keep. A good contract sets the price per sheet of replacement decking in advance and says how many sheets, if any, are included. When the crew finds bad decking, you should get a count and photos before the work proceeds, and approve the change in writing. Roof decking problems and pricing explains what counts as damaged sheathing and how replacement is written into contracts.

Stage 5: Building the New Roof From Edge to Ridge

Once the deck is sound, the new roof goes on from the bottom up, so each layer laps over the one below and sheds water toward the gutter. The order runs from edge metal and ice barrier at the eaves, through underlayment and starter shingles, to the field shingles, with step flashing at walls and flashing at penetrations worked in as the courses rise, and finally the ridge. How shingles are installed walks through that sequence with the workmanship checks you can verify.

Codes set minimums along the way. The 2021 International Residential Code (IRC), Chapter 9 covers roof assemblies, and states and cities adopt the IRC with amendments, so the rules on your roof depend on the edition your jurisdiction uses. As one local example, the City of Lincoln, Nebraska Re-Roof Policy (dated December 10, 2021, based on the 2018 IRC) requires drip edge on all eaves and gables. The roofing code items that apply to a re-roof are summarized on their own page, and your building department can confirm what applies to your house.

If the new roof meets an existing roof section, such as an addition or a garage roof that is not being replaced, the joint needs its own detail; roof tie-ins covers how that connection is made.

Stage 6: Cleanup, Final Inspection and Paperwork

When the ridge is capped, the job ends with cleanup: debris removed, gutters cleared, and the yard and driveway swept for nails with a magnet. If the job had a permit, the building department’s final inspection closes it out. Then comes your walkthrough, which is the check that should trigger the final payment; the final walkthrough checklist lists what to look at.

Warranty paperwork is the last item. GAF’s page on residential roofing warranties says its base shingle and roofing system warranties need no registration, while its enhanced warranties “do require registration, but your GAF Certified Contractor will take care of that.” Other manufacturers handle registration their own way. Whatever the brand, ask for the warranty documents and any registration confirmation in writing before you make the final payment, and keep them with the contract, the permit record and the final invoice. That folder is what a future buyer, home inspector or insurer may ask to see when they want to know how old the roof is and who installed it.

The Three Points Where Your Sign-Off Matters

Three moments need your signature or your written approval, and each one should be anticipated in the contract before work starts.

  1. Signing the scope. Before you sign, confirm the method, the number of layers coming off, the materials by product name, the deck replacement price, the permit, and cleanup.
  2. Approving deck changes. When tear-off reveals bad decking, approve the replacement in writing after you see a count and photos.
  3. Accepting the job. Do the walkthrough, confirm the permit’s final inspection, and collect the warranty paperwork before the final payment.

Before you sign, make sure the contract contains a clause requiring your written approval for deck changes and a clause tying the final payment to your acceptance of the finished job.

This guide is general information for U.S. homeowners, not legal, insurance, tax, or engineering advice. Codes, laws, and policy terms vary by location and change over time; confirm details with your local building department, your insurer, or a licensed professional.

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