Commerce prices
Pricing a low-slope roof
Most flat sections on a house are small, which means the fixed costs of getting a crew there matter more than the area does.
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These are estimated ranges, not quotes. Compiled from public installed-cost data for California and adjusted for how Commerce is built. No contractor is bound by them, and nobody can price a roof they have not stood on.
| Covering | Per square | Typical whole roof | Expected life |
|---|---|---|---|
| Architectural asphalt shingleThe default choice on most American homes, and usually the right one. | $625 – $950 | $12,000 – $26,500 | 25 to 30 years |
| 3-tab asphalt shingleThe cheapest thing that still counts as a roof. Fewer and fewer crews will install it. | $500 – $700 | $9,500 – $19,500 | 15 to 20 years |
| Impact-rated asphalt shingleClass 4 rated. Often earns an insurance discount where hail is a factor. | $825 – $1,300 | $15,500 – $36,500 | 25 to 35 years |
What moves the price
- How many old layers have to come off before the new one goes on
- Pitch — anything over about 7:12 needs staging and slows a crew down
- Access — a truck that cannot get near the house adds hours to every load
- The number of penetrations: chimneys, skylights, vents, solar mounts
- How much decking turns out to be soft once the covering is stripped
Locally
They also drive ember risk, which is why vent screening and Class A assemblies matter more here than the colour of the covering.
Be careful with coatings sold as replacements. Coating a sound roof buys years; coating a failed one buys a fresh colour.
These are estimates, not quotes. They are compiled from national installed ranges adjusted for California costs and for how Commerce is built. No contractor is bound by them.
Questions about price
Why three quotes and not one?
Because one price tells you nothing. Three tells you where the middle is, and the outliers are informative in both directions — the very cheapest is usually leaving something out, and the most expensive should be able to say what you are getting for it.
Why does ventilation keep coming up?
Because a badly ventilated attic cooks the roof from underneath and takes years off it. Intake at the eaves and exhaust at the ridge, in balance. It is cheap during a re-roof and awkward afterwards.
How long should a roof last here?
An architectural asphalt roof is rated for twenty-five to thirty years and, in this climate, tends to land at the lower end of that. Tile and metal go much further, provided what is underneath them is maintained.
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