How does the estimator work?
Roofers price by the square, which is 100 square feet of roof surface. The estimator divides your living area by the number of stories to get the footprint, adds any attached garage, multiplies by a pitch factor (a steeper roof has more surface over the same footprint) and adds 5% to 20% for eaves and overhangs. That gives a range, not a measurement.
What do typical the North Bay homes come to?
These examples use the same geometry. They describe roof area only, not price.
| Example home | Footprint under the roof | Pitch | Roofing squares (approx.) |
|---|---|---|---|
| Santa Rosa or Rohnert Park tract, 1,600 sq ft, one story | about 2,000 sq ft | 5-in-12 pitch | 23 to 26 |
| Petaluma two-story, 2,300 sq ft | about 1,550 sq ft | 6-in-12 pitch | 18 to 21 |
| Napa or Sonoma Valley country home, 2,800 sq ft, one story | about 3,300 sq ft | 6-in-12 pitch | 39 to 44 |
What makes a roof in the North Bay cost more than its size suggests?
North Bay single-story homes cover a lot of ground, so a modest house can still have a big roof. Shake roofs remain common on older country homes, and replacing one with a Class A roof usually means removing heavy material and adding solid sheathing over spaced boards. Rural parcels add delivery and disposal distance. In unincorporated Sonoma County, the schedule also waits on Permit Sonoma's pre-inspection.
What price range should I expect?
National cost surveys such as the Cost vs. Value report put a full asphalt-shingle reroof in the tens of thousands of dollars, with metal well above that. We don't publish a per-square or per-city price, because layers, decking, access and material swing real bids too much for one number to be honest. For your actual price, request a free written estimate: a licensed roofer measures the roof and prices your exact scope.
What should I have ready for an estimate?
- Your home's approximate living area and number of stories
- Roof age and any past reroof permits
- Whether there are solar panels, skylights or a chimney
- Photos of leaks or damaged areas, if any
Related: what drives roof replacement cost, metal roofs, dry rot and decking, solar removal and reinstall and our quote checker.
Every roofer we work with is licensed, insured and highly reviewed by Bay Area homeowners.
Get a free replacement quoteFrequently asked questions
How many squares is a 2,000 square foot house?
It depends on stories and pitch. A one-story 2,000 square foot home with a medium pitch is often somewhere around 23 to 27 squares; a two-story home of the same size has roughly half the footprint and fewer squares.
Can I get a price per square foot from you?
We don't publish one. Real bids vary with layers, decking, material and access, so ask for a free written estimate that shows the scope.
Why is my one-story Sonoma County home's roof so large?
A single-story house puts the whole living area under one roof, so it has more squares than a two-story home of the same size.
Sources
- Cost vs. Value 2025 report (JLC / Zonda)
- Permit Sonoma: residential reroofing
- Permit Sonoma: Class A roof bulletin B-07
- CSLB: check a license
Sources reviewed November 12, 2026. Figures are published estimates and official fees, not quotes. Confirm prices, permits and requirements with your contractor and building department. This page is general information, not legal or insurance advice.