How Long Does a Roof Replacement Take?

The short version

• Small, simple roof (one story, low pitch, one layer to remove, few penetrations): often one working day.
• Typical two-story home: one to two working days.
• Large, steep or complex roof (many valleys, dormers, chimneys or skylights, two or more layers): three days or more.

Those are days on the roof. Weather can pause work between them, and the time from signing to start depends on the contractor's schedule and material availability.

What affects how long it takes

• Roof size. More area means more tear-off, more underlayment and more shingles.
• Pitch. Steep roofs need more safety setup and slower, more careful movement.
• Layers. Each old layer of shingles adds tear-off time and debris.
• Deck condition. Rotted or damaged sheathing has to be cut out and replaced before anything new goes on. See roof decking explained.
• Complexity. Valleys, dormers, chimneys, skylights and walls all need flashing work, which is slower than open roof.
• Access. Tight driveways, steep lots and limited dumpster placement slow loading and cleanup.
• Weather. Rain stops tear-off. Cold affects how shingles handle and seal. High wind makes work on the roof unsafe.

A typical roof replacement, day by day

Before day one

The material and a dumpster are delivered, usually the day before or the morning of. The crew plans where debris will go and how landscaping, the driveway and the house will be protected.

Day one

1. 1Protect the property. Tarps go over plantings and around the house where debris will fall.
2. 2Tear off. Old shingles and underlayment are stripped, usually one section at a time, so the house is never left more open than can be covered the same day.
3. 3Inspect and repair the deck. Bad sheathing is cut out and replaced.
4. 4Dry in. Ice and water barrier goes on at the eaves and valleys and underlayment goes over the rest, so the roof is protected from rain even before shingles go on.

Day one or two

1. 1Drip edge and flashing. Edge metal goes on, and pipe boots, vent flashing, chimney flashing and wall flashing are installed as the shingles go up.
2. 2Shingles. Starter strip at the eaves, then shingle courses up to the ridge.
3. 3Ridge and vents. Ridge vent and ridge cap shingles finish the top.

Last day

1. 1Cleanup. Debris is removed, gutters are cleared and the yard and driveway are swept for nails, ideally with a rolling magnet.
2. 2Walkthrough. You and the contractor walk the job. Here is a homeowner checklist for the final walkthrough.

What happens if it rains or gets cold

Tear-off does not start when heavy rain is expected. A well-run job only opens as much roof as can be dried in the same day, so if weather turns, the exposed sections are already protected by underlayment or tarps.

Cold weather is workable, with care. Asphalt shingles have a strip of sealant that bonds each shingle to the one below, and that sealant needs warmth and sun to activate. In cold weather it may not seal until the weather warms, and shingle manufacturers' installation instructions can call for hand-sealing in those conditions. Shingles are also stiffer when cold and need gentler handling.

How to prepare your home

• Move vehicles out of the driveway and garage, or at least away from the house, before the crew arrives.
• Cover the attic. Tear-off shakes the whole roof. Dust and bits of debris can fall into the attic, so cover or move anything stored there.
• Take down wall hangings. Hammering can vibrate pictures and shelves on top-floor walls.
• Plan for pets and kids. It is loud, and there is activity all around the house. Keep pets inside or away, and keep kids clear of the work area.
• Clear the perimeter. Move patio furniture, grills and planters away from the walls.
• Mark what matters. Point out septic covers, sprinkler heads, outdoor lighting and anything fragile in the yard.
• Give access. Make sure the crew can reach an outdoor outlet and get to every side of the house.

You do not need to be home the whole time, but be reachable, especially during tear-off on day one in case the crew finds deck damage that needs your approval.