Roof Replacement: What to Expect Step by Step

By Ishaq Hassan. Updated October 3, 2026. 3 min read.

Short answer: Most home roof replacements take one to three days. The crew protects your yard, tears off the old roofing, inspects and repairs the roof deck, installs drip edge, ice and water shield and underlayment, then flashing, shingles and ridge vents, and finishes with cleanup and a magnetic sweep for nails. A permit and final inspection are usually required.

A new roof is a big project, but it usually goes faster than people expect. Knowing the roof replacement process helps you prepare your home and understand what the crew is doing each day.

Before work starts

Sign a written contract with materials, scope, schedule, permit and warranties
Confirm the roofer has pulled the permit
Move cars out of the driveway and garage
Move patio furniture, grills and planters away from the house
Take pictures and fragile items off walls, since hammering can shake them
Cover belongings in the attic, since dust and debris can fall

Illustration of a roof with missing shingles, cracked and curled shingles and hail marks — Missing, cracked or curled shingles let water reach the roof deck.

Step by step on installation day

Protection: tarps over plants, siding and the yard, and a dumpster placed near the house.
Tear off: old shingles, underlayment and flashing are removed down to the roof deck.
Deck inspection: rotted or soft boards are replaced. Ask how extra decking is priced.
Drip edge: metal edging along the eaves and rakes to guide water into gutters.
Ice and water shield: a waterproof layer at the eaves, valleys and around penetrations, often required in cold climates.
Underlayment: covers the rest of the deck.
Flashing: new metal around chimneys, walls, vents and skylights.
Shingles: installed from the bottom up, with the nailing pattern the manufacturer requires.
Ventilation: ridge vents or other vents installed so the attic can breathe.
Cleanup: debris removed and a magnetic sweep for nails.

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Illustration of an attic with a water stain on the roof boards and a bucket catching drips — Stains and damp insulation in the attic are often the first sign of a roof leak.

After the roof is on

A final inspection by the city, where required
A walk around with the roofer to check the work and cleanup
Written manufacturer and workmanship warranties
Registration of the manufacturer warranty if needed
Final payment only after you are satisfied and the inspection passes

What can delay a roof replacement

Rain, high wind or extreme cold
More rotted decking than expected
Material delivery delays
Permit or inspection scheduling

Illustration of a house with a blue tarp over a damaged roof and a fallen tree branch — A tarp protects the home after storm damage until repairs can be made.

Read about roof replacement, roofing cost and our guide to choosing a roofing contractor.

Illustration of a house with missing shingles, a blue tarp on the roof and hail falling — Storms can tear off shingles and let rain into the attic below.

Quick answers: roof replacement process

How long does a roof replacement take?

Most home roofs take one to three days, depending on size, weather and repairs to the deck.

Do I need to be home during a roof replacement?

Not always, but be reachable in case the crew finds rotted decking or other surprises.

Is a permit needed to replace a roof?

Usually, yes. Your roofer should pull it and arrange the final inspection.

What happens if the roof deck is rotten?

Damaged boards are replaced, often priced per sheet. Ask about this before signing.

Who replaces roofs?

A licensed roofing contractor. Sifixit can connect you with a local roofer.

This guide covered roof replacement process. For more background, see Ready.gov’s severe weather advice, and if you need help, Sifixit can connect you with a local provider.

This guide is general information for homeowners, not professional, insurance or safety advice for your situation.

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