About this service
Roof replacement means removing the existing roof covering — and sometimes the decking beneath — and installing a complete new system. It's generally considered when a roof reaches the end of its service life or has widespread damage.
A qualified contractor should evaluate the complete roof assembly before recommending work. The visible symptom may begin at flashing, drainage, ventilation, fasteners, or materials several feet from where moisture appears indoors.
What it generally involves
- Tearing off existing roofing down to the deck
- Inspecting and repairing the roof deck as needed
- Installing underlayment, ice barriers, flashing, and new covering
- Replacing or resealing vents, skylight curbs, and edge metals
- Site cleanup and a final walkthrough
Things to consider
- A replacement is a good time to review ventilation and insulation.
- Material choice affects weight, lifespan, appearance, and cost.
- Permits are required for replacement in many jurisdictions — contractors usually handle them.
- Ask about workmanship and manufacturer warranties offered by the contractor you hire.
- Ask the contractor about permits and code requirements that apply in your city and county.
What to ask before work starts
- • What condition is causing the problem, and how was it confirmed?
- • Which materials, preparation steps, and disposal costs are included?
- • What workmanship coverage applies to this specific type of roofing work?
- • Are permits, weather protection, cleanup, and final inspection included?
Common questions
How long does a roof replacement take?
Many single-family replacements take a few days, but size, complexity, weather, and material all affect the timeline. Your contractor can give a project-specific estimate.
Can a new roof be installed over the old one?
Some jurisdictions allow one overlay layer, but it isn't always advisable. A contractor can explain what's permitted and sensible for your roof.
Does this site set replacement prices?
No. Pricing comes from the independent contractor you choose. We recommend getting written estimates from contractors you contact.