A new roof on a 2,000 sq ft footprint at standard pitch works out to 2,240 sq ft of roof surface. In architectural shingles over OSB decking, this calculator prices that at $12,208–$21,840 across five line items — material, labour, decking, underlayment and flashing. Material choice moves the total more than house size does.
How this calculator builds the number
This tool prices a complete roof assembly rather than a covering. Every line is a per-square-foot rate applied to the same roof area, which makes the structure easy to audit and easy to compare against a quote.
| Line item | Rate per sq ft | Cost |
|---|---|---|
| Roofing material | $2.25–$4.00 | $5,040–$8,960 |
| Installation labour | $1.50–$2.75 | $3,360–$6,160 |
| Roof decking | $1.00–$1.60 | $2,240–$3,584 |
| Underlayment | $0.40–$0.80 | $896–$1,792 |
| Flashing and trim | $0.30–$0.60 | $672–$1,344 |
| Total | — | $12,208–$21,840 |
Computed from this calculator's own per-square-foot rates. Underlayment and flashing rates are fixed in this model and do not vary by covering.
Two things in that table are worth pausing on. Decking is always included — this calculator models new construction, where there is no existing deck to keep, which is also why it carries no tear-off line. And the underlayment and flashing rates do not change with material, so on a slate or tile job they shrink to a rounding error while on a 3-tab job they are a real share of the total.
Material is the biggest lever, by a wide margin
Changing the covering changes two lines at once — material and labour — because heavier and more specialised roofs are slower to install as well as more expensive to buy.
| Covering | Material | Labour |
|---|---|---|
| 3-tab shingles | $1.50–$2.50 | $1.25–$2.25 |
| Architectural shingles | $2.25–$4.00 | $1.50–$2.75 |
| Metal | $6.00–$12.00 | $3.00–$6.00 |
| Tile | $7.00–$15.00 | $4.00–$7.00 |
| Slate | $12.00–$25.00 | $5.00–$10.00 |
This calculator's own constants. Labour scales with material roughly two-to-one across the range.
From 3-tab to slate, material rises roughly eightfold and labour roughly fourfold. That is the whole story of roofing cost in one table, and it is why the honest first question on a re-roof is not "how much is a roof" but "which roof".
The upgrade from 3-tab to architectural is the one worth singling out, because it is small in cost terms and large in consequence. It adds roughly $0.75–$1.50 per square foot of material against a covering that is substantially more wind-resistant and longer-lived. On the 2,240 sq ft example that is under $3,500 at the top of the range.
The code rule that decides whether shingles are even allowed
Pitch is not only a cost multiplier on this page — it is a gate. IRC Section R905.2.2 states that asphalt shingles "shall be used only on roof slopes of 2 units vertical in 12 units horizontal (17-percent slope) or greater", and that from 2:12 up to 4:12 (33-percent slope) double underlayment is required.
So a low-slope roof does not simply cost a bit more per square foot; below 2:12 the cheapest two options on the table above are not available at all, and the job moves to a membrane system. Between 2:12 and 4:12 the underlayment line doubles by code — on the worked example, from $896–$1,792 to $1,792–$3,584.
This is the single most common reason a quote comes back above a neighbour's for a house that looks the same from the street. It is also the easiest thing to verify before you start comparing numbers: measure the pitch first, with the roof pitch calculator, and you will know which quotes are even comparable.
What a new roof returns when you sell
A roof is bought for shelter, but it is also one of the most-studied remodelling projects in the resale literature. The 2025 Cost vs. Value report puts a national asphalt-shingle roofing replacement at $31,871 with $21,501 recovered at resale — 68 percent. The metal equivalent costs $51,865 and returns $25,972, or 50 percent.
Read those two figures together and the conclusion is uncomfortable for metal: it costs 63 percent more and returns less in absolute dollars than the shingle job, at resale. Metal earns its premium through service life and through what it does in a wildfire or a hailstorm — not through what an appraiser gives you for it.
Note also that Cost vs. Value prices a full replacement including tear-off on an existing home, which is a different scope from the new-construction assembly this calculator models. The two numbers answer different questions and should not be netted against each other.
One genuine data gap is worth stating plainly. There is no federal statistic on what American homes are actually roofed with. The Census Bureau's Characteristics of New Housing tracks square footage, bedrooms, bathrooms, type of wall material and sales price — but not roofing material or roof type. Any market-share figure you see for shingles against metal comes from industry estimates, not from a government series.
What this estimate excludes
- ·Tear-off and disposal. This model prices a new roof on new construction. Removing an existing roof is separate work and is charged by the square.
- ·Structural framing. Rafters and trusses sit below the deck this page prices — see the roof truss calculator.
- ·Ventilation. Ridge and soffit venting is a code requirement and its own line item; price it with the roof vent calculator.
- ·Gutters. Not part of the roof assembly here.
- ·Permits and inspection. Set locally and not modelled.
- ·Complexity. The pitch multiplier captures area, not cut-up-ness. Dormers, valleys and penetrations all slow a crew down without adding much surface.
Methodology
Roof area is the footprint multiplied by this module's pitch multiplier (1.03 low, 1.12 standard, 1.25 steep, 1.39 very steep). Per-square-foot rates for material, labour, decking, underlayment and flashing are the constants held in this calculator's own module, and every figure and worked example above is computed from them. Code requirements are quoted from the 2021 IRC; resale figures are the 2025 Cost vs. Value national averages, quoted as published. No figure here is estimated or interpolated.
Sources
- ICC — 2021 International Residential Code, Chapter 9: Roof Assemblies (R905.2.2) — accessed 2026-09-05
- Journal of Light Construction — 2025 Cost vs. Value Report, National Averages — accessed 2026-09-05
- U.S. Census Bureau — Characteristics of New Housing — accessed 2026-09-05