How much does it cost to build an ADU in Sacramento County? The usual ADU job filed with Sacramento County is $133,039, from 207 priced permits (October 2023 through September 2026); the middle half of firms file between $99,402 and $173,840. A filed value is what the contractor wrote on the permit, not a quote or the final bill.
The usual ADU job filed with Sacramento County is $133,039, from 207 priced permits, October 2023 through September 2026. The middle half of firms usually file between $99,402 and $173,840. 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 ADU permit here usually takes 254 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 207 priced permits across 134 firms, pooled into one. Half of Sacramento County (unincorporated) ADU permits were filed between $85,400 and $186,000.
| Percentile | Filed value | Reads as |
|---|---|---|
| 10th | $56,100 | 1 in 10 permits filed below |
| 25th | $85,400 | 1 in 4 filed below |
| 50th | $133,000 | the middle permit |
| 75th | $186,000 | 1 in 4 filed above |
| 90th | $268,000 | 1 in 10 filed above |
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 |
|---|---|---|---|---|---|
| A Construction Pro Inc | 22 | 11 | $95,136 | $66,309–$192,371 | 89.9% |
| Imkat Construction Corp | 19 | 9 | $133,356 | $104,361–$165,618 | 95.9% |
| Golden State Adus | 4 | 2 | — | — | — |
| Norcal ADU Builders LLC | 3 | 2 | — | — | — |
| Andrew Lowell | 2 | 2 | — | — | — |
| West Coast Construction Pro Build | 2 | 2 | — | — | — |
| Byrne Remodel | 2 | 2 | — | — | — |
| Skyline Build & Design Inc | 3 | 1 | — | — | — |
| Dyer Construction Inc | 3 | 1 | — | — | — |
| Redwood ADU LLC | 2 | 1 | — | — | — |
Line your quote up against the file. In Sacramento County (unincorporated), 1 in 10 ADU filed values sit under $56,100, the middle half between $85,400 and $186,000, and 1 in 10 over $268,000.
Sacramento County files the fewest ADU permits in February (64 against an average month of 100) and the most in August (186). 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 Sacramento County →
Source: Sacramento County building permits on single-family, duplex and townhouse homes in the unincorporated county (the County's Accela permit layer). 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 Sacramento County (unincorporated) →
ADU cost in other cities: Nashville Raleigh Denver San Diego Honolulu Palo Alto Bellingham San Francisco Anaheim Marin County (unincorporated)
Other job costs in Sacramento County (unincorporated): HVAC · Roofing · Electrical & Panel · Water Heater · Remodel, Addition & Repair · New Home · Solar & Battery · Windows & Doors · Plumbing & Sewer · EV Charger · Patio Cover & Accessory Structure · Pool & Spa · Demolition