Cost comparison · Break-even
Metal roof vs. shingles: what does the math actually say?
Everyone tells you metal costs two to three times more and lasts decades longer. Nobody shows the crossover year. Here is the arithmetic, with every assumption visible and editable.
Sources verified · Reviewer: placeholder pending
The prices, honestly labeled
This project has not collected installed pricing of its own, so the figures below are published estimates from named cost guides: This Old House’s 2026 guide (built on Homewyse data, updated April 2026) and Homewyse’s own May 2026 calculators. They are national averages with wide local variance. Treat them as the starting point the calculator lets you overwrite with real bids.
| System | Per sq ft installed | Status |
|---|---|---|
| Asphalt shingles — basic (3-tab) | $4–$6 | Published estimate |
| Asphalt shingles — architectural | $6–$8 | Published estimate |
| Standing-seam metal (steel) | $16–$24 | Published estimate |
| Aluminum standing seam | $17–$25 | Published estimate |
| Copper | $29–$41 | Published estimate |
The lifespans are not estimates. They are InterNACHI’s published service-life figures: 20 years for 3-tab, 30 for architectural, 40–80 for metal. That asymmetry is the entire comparison: over any horizon past the first shingle replacement, you are comparing one metal roof against two or three shingle roofs.
Run your own numbers
The overview answers you will find elsewhere say metal’s total cost of ownership gets “closer over 50 years.” Closer by how much, and crossing when? That depends on three numbers you can actually get: your roof’s size and two real quotes. The calculator shows its work; nothing is hidden in the result.
Break-even calculator
Default prices are published estimates, not quotes. Edit them with your own bids. Ignores inflation and financing, and adds no energy credit.
Metal install: $40,000 · Shingle install: $14,000
Break-even: year 60
The math: shingles cost $14,000 today plus $14,000 per re-roof every 30 years. By year 60 the shingle path has bought 3 roofs ($42,000), meeting metal's one-time $40,000.
| Year | Shingle path (cumulative) | Metal path (cumulative) |
|---|---|---|
| 0 | $14,000 | $40,000 |
| 10 | $14,000 | $40,000 |
| 20 | $14,000 | $40,000 |
| 30 | $28,000 | $40,000 |
| 40 | $28,000 | $40,000 |
| 50 | $28,000 | $40,000 |
| 60 | $42,000 | $40,000 |
Energy, southern climates: this calculator adds no energy credit, because no verified annual-dollar figure exists to add. Directionally it favors metal: the EPA reports that a reflective (“cool”) roof can cut peak cooling demand by 11–27%. Whether your metal roof qualifies depends on its finish, and annual bill savings depend on your rates. Treat any contractor’s savings claim as a number to be shown, not assumed.
The warranty difference nobody prices in
Both systems come with “Lifetime” warranties, and the word hides opposite realities. A lifetime shingle warranty pays in full for 10 years, then prorates hard: 50% of materials and no labor at year 25, by GAF’s own worked example, with hail excluded outright. Metal warranties run on a different clock, and paint finish is typically warranted separately from the substrate. The full proration math is in our lifespan and warranty guide.
Tenure is the deciding variable. Warranties end or collapse at the sale (one transfer, short notice windows, terms that drop to two years). If you expect to move within a decade, the metal premium mostly benefits the next owner. That is a fine choice if it sells the house, but it is a different purchase than 40 years of not thinking about your roof.
Energy: what is verified, and what is not
Verified: the EPA reports that reflective “cool” roofs can cut peak cooling demand by 11–27% in air-conditioned homes. Not verified anywhere we can cite: an annual-dollar savings figure for a metal roof in general, because it depends on the finish, your climate, and your rates. And in heating-dominated northern climates, DOE/Oak Ridge Roof Savings Calculator analyses have shown reflective roofs producing net energy losses. The winter sun you reflect away was heat you wanted. That is why the calculator above treats energy as context, not as a line item.
Sources
- InterNACHI Standard Estimated Life Expectancy Chart — Service life: 3-tab 20 yrs, architectural 30, metal 40–80. Verified 2026-08-21.
- This Old House, Shingles vs. Metal Roof Cost (2026) — Published installed-cost estimates (Homewyse data; updated 2026-04-03). Labeled estimates, not collected quotes.
- Homewyse, Cost to Install Seam Metal Roof (May 2026) — Standing-seam installed estimate $17.74–$23.95/sq ft. Labeled estimate.
- US EPA, Using Cool Roofs to Reduce Heat Islands — Peak cooling demand reduction 11–27% (citing Synnefa, Santamouris & Akbari 2007); winter heating penalty acknowledged. Verified 2026-08-21.
- GAF Shingle & Accessory Limited Warranty (RESWT160L) — Proration and hail-exclusion terms referenced in the warranty section.