Roof Replacement Cost Calculator
Build a transparent roofing budget by roof area, state, material, pitch, stories, tear-off layers, decking repairs, roof details, permit and contingency.
Your project details
Start with your measured roof area, then test how material and repair allowances change your budget.
2,000 sq ft of roof, asphalt shingles, two stories and one existing layer. Uses the national baseline, 100 sq ft of decking repairs, two roof details, a $350 permit allowance and 10% contingency.
Illustrative planning assumptions. Loading the example replaces the fields below.
Compare two roof budget scenarios
Calculate your first estimate and save it as Scenario A. Then change a material, repair allowance or other assumption and calculate again to compare Scenario B.
Calculate an estimate above to start.
Scenario A lasts until this page is refreshed. Your latest calculated estimate is available in the quote tool in this tab for up to two hours.
Have proposals? Check what each price includes.
Take your planning range to the quote comparison tool. Enter the actual contractor totals and compare allowances, written scope and warranty clarity.
No proposals yet? Get the free scope and budget worksheets.
Need to understand one line of the estimate?
Break the project into materials, labor, tear-off, decking, flashing, ventilation, permits, size and location.
How this roof replacement cost calculator works
Before comparing a model result with a proposal, audit the roof-surface unit cost and separate material-order allowances. Keep the same measured area when moving between system-only and complete-project totals.
The calculator starts with an installed cost-per-square-foot planning range for the selected material. It adjusts that range for pitch and complexity, building height, broad state price levels and local-market sensitivity. It then adds tear-off layers, decking-repair allowance, skylights or other complex roof details, permits and owner-controlled contingency.
Roof replacement cost per square foot
Roof replacement cost per square foot changes with roofing material, labor, roof access, pitch, tear-off, decking repairs and local pricing. Enter the actual roof surface area above instead of relying only on your home’s interior square footage.
Roof replacement cost by house size
Planning a common house-size scenario? See our guides for roof replacement cost for a 1,500 sq ft house, roof replacement cost for a 2,000 sq ft house, and roof replacement cost for a 2,500 sq ft house.
Roof replacement cost by state
Start with our detailed guides for Texas, Florida, California, New York and Pennsylvania, or use the state-adjusted planner for all 50 states.
What can move a real roofing quote?
Decking repairs, flashing, ventilation, underlayment, disposal, permits, access, warranty, product brand and local labor can all change the final price. A low quote may also exclude items that a higher quote includes.
Compare tear-off, decking and roof details
Ask every bidder to state the number of layers being removed, the unit price for unexpected deck replacement, and how chimneys, skylights, valleys and wall transitions are flashed. These scope differences can explain a large price gap between quotes.
Compare roofing materials and measurements
Use the Roofing Square Calculator to convert roof area into roofing squares, the Roof Pitch Calculator to understand slope, and read metal roof vs shingles cost before comparing material options.
Best way to use the number
Use the range to establish a budget, then compare at least three itemized quotes with the same scope. Ask each contractor to identify exclusions and allowances in writing.
Frequently asked questions
Is house square footage the same as roof area?
No. Roof pitch, overhangs, attached garages, porches and the number of stories change actual roof surface area. Use measured roof area when available.
Does the estimate include tear-off and permits?
Yes, based on the tear-off layers and permit allowance you enter. Disposal, access and local requirements still need confirmation in contractor proposals.
How should I use the decking repair allowance?
Enter a reasonable square-foot allowance for planning, then ask contractors for a written unit price and approval process for deck repairs discovered after tear-off.
Is the state adjustment an exact local quote?
No. It is a broad state price-level sensitivity. Metro conditions, storms, contractor availability, product choice, insurance and code requirements can move local pricing.
Official sources and further reading
Get a useful roof estimate in three passes
- Enter the roof, not the living area. Use measured roof surface when available and choose the material and complexity that actually fit the project.
- Add known scope. Enter tear-off layers, decking allowance, roof details and permit assumptions instead of hiding them inside one unit price.
- Replace model assumptions with bids. Once local proposals arrive, compare the written scope and update the planning inputs.
Roof calculator reference
Formula
Planning total ≈ roof area × installed unit range + tear-off + known repairs + permits + contingency.
Best input
Measured roof surface, not interior living area. Use roof squares and pitch tools when the geometry is uncertain.
Before hiring
Compare exact products, flashing, ventilation, deck-repair method, cleanup and warranties on the same scope.
On this page
Calculator · Roofing squares · Roof pitch · Compare quotes · Full roof guide
Keep your project plan beside your quotes
Save the free 14-page planning guide. Use its scope checklist and budget worksheets when a new proposal arrives, then return here to update your numbers.
Email delivery is available on the guide page. Ongoing planning emails are optional.