Roof replacement cost in California for a 20-square roof
| Typical total$614 per square | $12,273 |
|---|---|
| Range you should see in bidsthree bids on the same scope normally land inside this | $8,328 – $19,724 |
| Labor portion60% of the job — this is the part that moves by state | $7,364 |
| Material portion40% — bought at national prices | $4,909 |
| Roofers pay in Californiaabout $32/hr · BLS OEWS May 2025, SOC 47-2181 | $67,420/yr |
| U.S. mean for the same tradeSOC 47-2181 | $58,140/yr |
| Versus the national priceCalifornia trade pay runs +16% against the U.S. mean | +$1,073 |
Notes
- **Where the number comes from.** The national price for a full asphalt shingle roof replacement is $560 per square — installed asphalt shingle pricing published for 2026, $3.50–$10.00 per ft² of roof. Labor is about 60% of that. Roofers in California average $67,420 a year against a U.S. mean of $58,140 — a factor of 1.16 — so the labor half is scaled by that and the material half is not.
- **What is in the price:** tear-off of one layer, synthetic underlayment, architectural shingles, starter, ridge cap, drip edge, nails, disposal and labor.
- **What is not:** decking replacement, chimney or skylight flashing rebuilds, structural repair, and permits. These are the lines that turn a $12,273 quote into a $15,341 invoice, so ask about each one before signing.
- **Why state matters more than people expect.** Materials ship at national prices; crews do not move. California sits above the national mean by 16%, which lands on 60% of the job and moves the total by $1,073.
- **Use this as a bid check, not a quote.** It prices an average job in an average condition. Steep access, a second story, a tear-off of two layers, or a crew booked out three months all move the real number, and none of them are in a per-unit average.
A 20-square roof in California
$12,273 is the typical figure, and bids on the same scope normally land between $8,328 and $19,724.
That is 20 squares at $614 each.
Why this is not the national number
The same job priced at the U.S. average comes to $11,200 — this one is $1,073 more.
The reason is one number, and it is a published one. Roofers in California average $67,420 a year against a U.S. mean of $58,140, from the Bureau of Labor Statistics OEWS release for May 2025, SOC 47-2181. That is roughly $32 an hour of trade pay, a factor of 1.16, or +16% against the national mean.
Labor is about 60% of this job. Material is the other 40%, and material does not care what state it is nailed down in — a pallet costs what a pallet costs. So only the labor half is scaled here, and the material half is left at national pricing.
That is the whole model, and it is deliberately simple enough to check: $7,364 of labor, $4,909 of material.
What a square is, and why the estimate hinges on it
A square is 100 ft² of roof, not of floor. A 2,000 ft² single-story house does not have a 20-square roof — a 6/12 pitch adds about 12%, a 10/12 adds 30%, and hips and valleys add waste on top. Measure the roof, or the whole number above is answering a different question.
What is in this price
Tear-off of one existing layer, synthetic underlayment, architectural shingles, starter course, ridge cap, drip edge, nails, disposal, and labor.
What is not
Decking replacement is the big one. It is invisible until the old shingles come off, it is quoted per sheet, and on an older roof it is the line most likely to turn a $12,273 quote into something well past $19,724. Get the per-sheet price in writing before work starts.
Chimney and skylight flashing rebuilds, structural repair, and permits also sit outside this figure.
How to use this against a real bid
Three quotes on identical scope should cluster. One well under $8,328 usually means something was left out of the scope rather than found cheaper — read what is excluded before reading the total. One well over $19,724 is either a harder job than average or a crew that does not want the work and priced accordingly.
The number above prices an average job in average condition. Access, story height, season, and how booked the crew is all move it, and none of those live in a per-unit average.
Nearby sizes
Read more
- Metal Roof vs Shingles — the Cost Comparison, and When It Stops Being CloseMetal costs two to three times asphalt up front and lasts two to three times as long. That symmetry is why the decision almost never turns on price per year.
- Roof Replacement Cost by State — Built From BLS Roofer PayMost state roofing tables are bands somebody eyeballed. This one is arithmetic on a published number: BLS mean pay for roofers in each state, applied to the 60% of a re-roof that is labor.
- Roof Decking Replacement Cost — the Change Order Nobody Quotes ForDecking is the one line on a roofing job that cannot be priced before the old shingles come off. How your contract words that unknown matters more than the rate.
- Roof Replacement Cost by House Size — and Why the House Number MisleadsA 1,500 sq ft house does not have 1,500 sq ft of roof. On a common 6/12 with normal eaves it has closer to 1,900, and every quote is priced on the larger number.