How much does home addition cost in San Francisco? The usual addition job filed with San Francisco is $230,000, from 672 priced permits (October 2023 through September 2026); the middle half of firms file between $207,800 and $578,511. A filed value is what the contractor wrote on the permit, not a quote or the final bill.
The usual addition job filed with San Francisco is $230,000, from 672 priced permits, October 2023 through September 2026. The middle half of firms usually file between $207,800 and $578,511. Half of jobs were filed for less, half for more. A filed value is what the contractor wrote on the permit, not a quote or the final bill. An addition permit here usually takes 621 days from issue to final inspection. How long permits take →
Approximately, from each firm's own spread: every firm's range of filed values, weighted by its 672 priced permits across 507 firms, pooled into one. Half of San Francisco addition permits were filed between $100,000 and $540,000.
| Percentile | Filed value | Reads as |
|---|---|---|
| 10th | $37,900 | 1 in 10 permits filed below |
| 25th | $100,000 | 1 in 4 filed below |
| 50th | $251,000 | the middle permit |
| 75th | $540,000 | 1 in 4 filed above |
| 90th | $895,000 | 1 in 10 filed above |
Firms split into thirds by the usual value of the homes they work on, with each third's usual filed value weighted by permits. Home values: San Francisco Assessor-Recorder 2025 assessed values (Proposition 13 values, which usually sit well below market value). Under Proposition 13 a home assessed at its 1980s purchase price can carry a value far below what it would sell for today, so treat the home-value matching and the price-versus-similar-jobs comparison as rough.
| Firms working on | Usual home value | Usual filed value | Firms | Permits |
|---|---|---|---|---|
| Lower third | under $979,200 | $234,894 | 167 | 200 |
| Middle third | $979,200–$1,734,000 | $242,186 | 168 | 233 |
| Upper third | $1,734,000 and up | $339,428 | 168 | 235 |
Top 10 by permits in the last 12 months. Usual is each firm's middle filed value; middle half is the range its middle half of jobs were filed in; both are shown for firms with 5 or more priced permits. Busy is not the same as careful: pick what you value to build a list.
| Firm | Permits | Last 12 mo | Usual | Middle half | Finished |
|---|---|---|---|---|---|
| D3 Construction | 6 | 4 | $533,400 | $205,000–$618,160 | — |
| Matarozzi/Pelsinger Builders Inc | 5 | 3 | $100,000 | $100,000–$800,000 | — |
| The Toboni Group | 4 | 3 | — | — | — |
| Ren Lei Construction Co | 6 | 2 | $578,511 | $435,633–$753,622 | — |
| C H Burnham Inc | 6 | 2 | $352,868 | $229,254–$520,184 | 3 of 5 |
| Manzyuk Enterprises Inc | 4 | 2 | — | — | — |
| AT6 Design Build | 4 | 2 | — | — | — |
| O'Shea Co. Home Grown Construction | 4 | 2 | — | — | — |
| Amber - Tru Construction Inc | 3 | 2 | — | — | — |
| Planart Construction Corp | 3 | 2 | — | — | — |
Line your quote up against the file. In San Francisco, 1 in 10 addition filed values sit under $37,900, the middle half between $100,000 and $540,000, and 1 in 10 over $895,000.
San Francisco files the fewest addition permits in November (66 against an average month of 100) and the most in September (135). If you can choose, ask for quotes in a quiet month. We have no prices by month, so this is about crews' schedules, not a discount. When each trade is busiest in San Francisco →
Source: San Francisco DBI building permits on one- and two-family homes, with the contractor from the city's permit contacts file. The window is October 2023 through September 2026; a permit filed after that isn't here yet.
Usual is the middle permit: half were filed for less, half for more. Only permits with a filed value count; a value of $0 or none is left out.
The spread is approximate: we keep seven points of each firm's own range of filed values, not every permit, and pool them.
Nobody paid to be on this page and nobody can. How the records work in San Francisco →
Addition cost in other cities: Orlando Cincinnati Miami Minneapolis Denver San Diego Honolulu Albuquerque Boulder Greensboro Saint Paul Arlington, VA Scottsdale Somerville Cary Naperville Bellevue Cape Coral Bellingham Bend Anaheim Columbus, OH Marin County (unincorporated)
Other job costs in San Francisco: Roofing · Kitchen, Bath & Remodel · Windows & Skylights · Decks, Stairs & Porches · Siding, Dry Rot & Exterior Repair · Foundation & Seismic · Fire Sprinklers & Alarms · Solar & Battery · ADU