Roof Cost Calculator

What this calculator does

This calculator gives you a full installed-cost estimate for replacing a sloped roof. It accounts for:

• Material — asphalt shingles (3-tab, architectural, premium), standing-seam metal, corrugated steel, concrete tile, clay tile, natural slate, wood shake, or single-ply membrane
• Labor — adjusted for pitch (steeper = slower) and roof complexity (more valleys = slower)
• Tear-off — single, double, or triple existing layers
• Disposal — landfill tipping varies by region and material weight (tile and slate cost ~50% more to dispose of than asphalt)
• Underlayment — synthetic underlay or felt
• Gutters — optional, by linear footage
• Permit + miscellaneous — typically 3% of subtotal, minimum $450

How to use it

1. Get the roof area — measure each roof plane’s slope-adjusted area in square feet. If you only know the footprint, multiply by the slope factor (use our roof square footage calculator which does this for you).
2. Set the pitch — enter as X/12 (rise per 12 inches of run). This adjusts labor cost; steeper pitches require harnesses and slow the crew. Use our roof pitch calculator to find your pitch if you don’t know it.
3. Pick a material — architectural asphalt is the most common choice in 2026 (about 75% of U.S. residential replacements per NRCA). Standing-seam metal is the fastest-growing premium option.
4. Region — adjust for your local market. New York, San Francisco, Boston, Honolulu, and Seattle run 25–35% above the national average. Rural Texas, Mississippi, Alabama, Oklahoma run 12–18% below.
5. Complexity — a simple gable with two roof planes is “simple”. A house with one or two dormers is “moderate”. A house with multiple gables, hips, and valleys is “complex” and adds 12–28% in labor.
6. Tear-off, underlay, gutters — toggle and quantify.

Typical 2026 installed cost ranges (mid-cost region, 2,000 sq ft roof)

Sources: 2026 NRCA Annual Market Survey; GAF, Owens Corning, CertainTeed regional contractor pricing; HomeAdvisor 2026 cost guides; Angi state-level roof replacement data Q1 2026.

Cost drivers in detail

Roof size. Cost scales linearly per sq ft, but very small roofs (under 1,000 sq ft) carry a mobilization premium — minimum job costs run $4,500–$6,500 even on a tiny shed roof.

Pitch. A 4/12 pitch is “walkable” — labor multiplier 1.0. A 6/12 pitch needs careful footing — multiplier 1.05. An 8/12 pitch requires harnesses and roof jacks — multiplier 1.18. A 10/12 pitch is steep enough that progress is half-speed — multiplier 1.32. A 12/12 pitch (45°) requires staging and rope access — multiplier 1.50.

Tear-off layers. Single layer: $1.45/sq ft. Double layer: $1.85/sq ft. Triple layer: $2.35/sq ft and the IRC R908.3 requires complete tear-off (no recovering allowed when there are already two layers).

Region. Labor is 30–40% of regional cost variance. NYC, SF, Boston, Honolulu, Seattle: 25–35% above national. LA, Chicago, DC, Miami: 12–22% above. Most of the South and Midwest: at or near national average. Rural plains, Deep South: 12–18% below.

Roof complexity. Each valley, dormer, chimney, or skylight adds flashing, cuts, and labor time. A 2,000 sq ft simple gable might roof in 2 days; the same square footage on a complex roof with 4 valleys, 2 dormers, and 3 chimneys takes 4–5 days for the same crew.

Decking condition. Once tear-off exposes the deck, soft, rotten, or warped sheets must be replaced. Plan a 5–10% contingency for deck repairs, more on roofs over 30 years old.

Code-required upgrades. 2026 IRC requires ice-and-water shield in any region where the average January temperature is below 25°F (climate zones 4–8 in most of the US). This adds $0.45/sq ft to the underlayment line. Many jurisdictions also require ventilation upgrades to net free vent area equal to 1/300 of attic floor.

Asphalt vs metal vs tile — which to pick

Architectural asphalt shingles are the default choice for most 2026 replacements. Good warranties (30–50 year limited), wide style options, easy to match if a section needs replacement later, and serviceable by any roofer. Pick architectural asphalt for: tract homes, neighborhoods with HOA shingle requirements, budget-driven projects, and roofs in moderate climates.

Standing-seam metal is the premium upgrade. Lasts 2–3× longer than asphalt, sheds snow cleanly, doesn’t lose granules, accepts solar panels without roof penetrations, and has 30–50% better insurance loss ratios in hail country. 50–80% more expensive upfront but cheaper per year over service life. Pick metal for: hail-prone regions (Texas, Oklahoma, Nebraska), wildfire areas (California, Colorado), homes with steep pitches, and homeowners planning to stay 15+ years.

Concrete or clay tile is region-specific — common in the southwest, Florida, and California. Lasts 50–100 years. The structure must be engineered to support 800–1,200 lb per square (vs 250 lb for asphalt). The underlay needs replacing every 25–30 years even though tiles last longer.

Natural slate is for historic homes and discerning buyers. Lasts 75–150 years. Most expensive option. Requires structural reinforcement, specialized installers, and copper flashings.

Wood shake is style-specific. 30-year life. Banned in many wildfire zones. Requires Class A fire-treated underlay in California, Colorado, and parts of Arizona, Oregon, Washington.

Common gotchas that blow the budget

Decking replacement. Roofers usually quote replacing 1–3 sheets at “no charge” but anything beyond that runs $65–$95 per sheet (32 sq ft / sheet). Older roofs (40+ years, 1×6 or 1×8 plank decking) often need full re-decking — $1.85–$2.50/sq ft additional.

Skylight replacement. A skylight with a roof has the same age as the roof. Velux fixed skylights cost $450–$900 to replace (frame + flashing kit + labor). Don’t reuse old skylights — they’ll leak and you’ll be doing it again in two years.

Chimney flashing. Old metal flashings should be replaced at every re-roof. Lead flashing repair on a brick chimney runs $350–$700. Cricket installation behind a wide chimney (>30”) runs $400–$1,200.

Gutter replacement. Old gutters often can’t be lifted off and re-attached without damage. Plan $7–$12 per linear foot for new gutters if they’re 15+ years old, $9–$14 per linear foot for seamless aluminum, $18–$28 per linear foot for copper.

Solar panels. If you have solar panels, removal and reinstallation adds $2,500–$5,500 to the project. Always re-roof before installing solar to avoid this — and check that your solar installer didn’t void your roof warranty by not following manufacturer flashing details.

When to repair vs replace

Repair makes sense if:

• The roof is under 60% of its expected service life
• Damage is localized (a few missing shingles, one valley, one penetration)
• The remaining field is in good condition with no granule loss
• Decking under the damage is dry

Replace if:

• The roof is past 75% of expected life
• More than 15% of the field has issues (curling, cupping, granule loss)
• Multiple leaks across non-adjacent areas
• Repeated repair attempts haven’t held
• You’re planning to add solar panels or a major renovation in the next 5 years

Related calculators

• Calculate roofing materials — full material takeoff with bundles, underlay, drip edge, ridge cap, nails
• Roof square footage calculator — get accurate slope-adjusted area
• Flat roof replacement cost — TPO, EPDM, PVC, mod-bit, BUR
• Roof pitch calculator — find your pitch before pricing

Sources: 2026 NRCA Annual Market Survey; 2026 International Residential Code Chapter 9 (R903–R908); GAF, Owens Corning, CertainTeed manufacturer pricing data; HomeAdvisor 2026 roof cost guides; Angi 2026 state-level roofing pricing; Underwriters Laboratories UL 790 fire ratings; ASTM D3462 (asphalt shingles), ASTM D6878 (TPO), ASTM D4637 (EPDM).