What should your new roof cost?

A better quote starts with better measurements

Roof replacement cost per square foot

Roofers price the actual sloped roof surface, not your home's total living area. The calculator multiplies the building footprint by the selected pitch factor, then adds a 10–15% cutting and layout allowance. One “roofing square” equals 100 square feet.

The installed-price bands below are broad 2026 U.S. planning figures from Networx. They are deliberately ranges because roof access, labor, product tier and hidden damage cannot be known from a browser. The calculator separates optional tear-off so you can see how removing an existing roof changes the range.

Asphalt vs. metal vs. tile vs. slate

Roof replacement cost by house footprint

These examples use a 6/12 pitch, a simple layout with 10% waste, asphalt shingles, and one tear-off. They are not averages; they show exactly how the calculator turns a footprint into a planning range. A two-story home's roof footprint is usually much smaller than its total living area.

Footprint is not total living space

For a one-story house, the footprint may be close to the heated square footage plus attached garages and covered additions. For a two-story house, using the entire living area can substantially overstate the roof. Use a survey, builder plan or exterior length × width when possible.

What can increase a roof replacement quote?

Steep slopes, multiple dormers and valleys, difficult access, more than one existing layer, heavy tear-off materials, damaged decking, skylights, chimney flashing, ventilation changes, permits and local code requirements can all change a bid. Ask contractors to identify each allowance and unit price instead of folding unknown work into one unexplained total.

Why pitch changes the answer

A 6/12 pitch has a 1.118 area multiplier. That means a simple 1,800-square-foot footprint has roughly 2,012 square feet of sloped roof surface before waste. The pitch factors use the geometric formula √(1 + (rise ÷ 12)²), consistent with Roof Online's multiplier table.

Roof labor cost vs. DIY

The published ranges used here are installed prices, so they combine materials and professional installation rather than pretending labor is the same in every market. Roofing also involves fall exposure, weatherproofing details and manufacturer installation requirements. This calculator is most useful for budgeting and comparing written bids—not as a DIY materials order.

If you are considering doing any work yourself, separate safe ground-level preparation from work on the roof. Ask whether owner-supplied materials or partial tear-off would affect the contractor's warranty, insurance coverage or willingness to take the job. Local permit and disposal rules still apply.

What to compare in contractor bids

Do not compare totals alone. Ask each contractor to list measured roof squares, exact product line, underlayment, flashing, ventilation, tear-off layers, decking allowance, disposal, permits, workmanship warranty and payment schedule. The downloadable checklist captures these items.

Roof replacement timeline and payment planning

Ask every bidder for an anticipated start window, on-roof work duration, weather-delay policy, delivery and cleanup plan, and what triggers each payment. Keep the contract, change orders, product labels, inspection records and final warranty documents together. Never treat a browser estimate as a financing offer or as proof of insurance coverage.

Does homeowners insurance pay for a new roof?

Coverage depends on the cause of damage, policy terms, exclusions, deductibles, roof condition and claim documentation. Wear and age are different from a covered sudden event. If a storm may be involved, document damage, prevent further loss when safe, and contact the insurer before authorizing major work. A contractor can describe roof damage; the insurer determines coverage.

Roof warranties: what to ask

Separate the manufacturer's material warranty from the contractor's workmanship warranty. Ask who registers the product, which installation details are required, whether ventilation affects coverage, what is prorated, what labor is included, and whether the warranty transfers when the home is sold. Get the answers in writing.

When to repair a roof vs. replace it

Age alone is not a diagnosis. Multiple leaks, widespread curling or cracking, recurring patches and deck damage can point toward replacement, while isolated storm damage may be repairable. Have the roof inspected before making a final decision, and check insurance coverage when wind, hail or another covered event may be involved.

A written inspection should distinguish a surface problem from failed flashing, ventilation, underlayment or decking. If two bids recommend different scopes, ask both contractors to show the affected areas in photos and explain what can be repaired independently.

Roof replacement cost FAQ