Roof Cost Calculator

Answer six questions. Get a real range with every line itemized — no email, no phone number, no quote request.

How this estimate is built

Every figure comes from a published cost dataset we maintain and date-stamp, not from a lead form or a quote request. The version and date sit at the bottom of any result.

The math runs in four steps:

1. Roof size from house size. Living area gets divided by the number of stories to get the footprint, then multiplied by a slope factor for pitch and about 10% for eave and rake overhang. This is why a 2,400 sq ft two-story home has roughly half the roof of a 2,400 sq ft ranch — and why "square footage" alone tells you almost nothing about roof cost.
2. Materials and installation, priced per square (100 sq ft) and adjusted for both your state's labor rates and the extra difficulty of working a steep roof.
3. Tear-off, priced per square and including haul-away and dump fees. A second layer costs more to remove than the first, but not double — it's roughly 50–75% more.
4. Everything else — decking replacement, flashing around chimneys and skylights, ridge vent, ice and water shield, second-story access, and your state's permit fee.

What this estimate does not include

Being clear about the gaps is the difference between a useful estimate and a misleading one:

• Structural work. Tile and slate are heavy. If your framing can't carry the weight, reinforcement is a separate job with a separate price.
• Hidden damage. Rot, failed sheathing, and old repairs done badly only surface once the roof is open. That's what the decking option approximates — it can't predict.
• Complex roof geometry. Lots of valleys, dormers, turrets, or multiple intersecting planes all add labor that a footprint calculation can't see.
• Your specific market. State-level labor averages hide real variation between a metro and a rural county two hours away.

Treat the output as a bracket to judge quotes against, not a price to hold anyone to.

What moves your number the most

If you're trying to bring the cost down, these are the levers in rough order of impact:

Material. The spread between a basic 3-tab shingle roof and natural slate on the same house is often four to six times. Architectural shingles sit near the value sweet spot for most homes — meaningfully longer-lived than 3-tab for a modest premium.

Roof size, which you can't change — but you can stop over-estimating it. Many homeowners assume their roof matches their living area. On a two-story home it's roughly half.

Layers coming off. Going from one existing layer to two adds real money. If a previous owner had a roof installed over the old one, you're paying for that decision now.

Pitch. A steep roof needs fall protection and slows the crew down, and that surcharge applies to the whole job.

Where to go next

What a roof replacement actually costs — the long-form version: ranges by home size and material, where the money goes, and the factors that move your number.

How to read a roof estimate — what a legitimate quote itemizes, where padding hides, and which exclusions to push back on. Read this before you compare bids.

Will insurance pay for it? — if the damage was sudden and storm-related, the answer may be yes. If it's age and wear, it usually isn't. Worth settling before you finance anything.

Paying for a new roof — what each payment route actually costs over the full term, not just the monthly figure.