How much does a garage, ADU & accessory building job cost in Boulder? The usual garage, ADU & accessory building job filed with Boulder is $90,500, from 141 priced permits (October 2023 through September 2026); the middle half of firms file between $45,000 and $125,000. A filed value is what the contractor wrote on the permit, not a quote or the final bill.
The usual garage, ADU & accessory building job filed with Boulder is $90,500, from 141 priced permits, October 2023 through September 2026. The middle half of firms usually file between $45,000 and $125,000. 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. A garage, ADU & accessory building permit here usually takes 411 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 141 priced permits across 87 firms, pooled into one. Half of Boulder garage, ADU & accessory building permits were filed between $33,200 and $169,000.
| Percentile | Filed value | Reads as |
|---|---|---|
| 10th | $11,500 | 1 in 10 permits filed below |
| 25th | $33,200 | 1 in 4 filed below |
| 50th | $96,200 | the middle permit |
| 75th | $169,000 | 1 in 4 filed above |
| 90th | $301,000 | 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: Boulder County Assessor values.
| Firms working on | Usual home value | Usual filed value | Firms | Permits |
|---|---|---|---|---|
| Lower third | under $1,312,400 | $60,000 | 28 | 48 |
| Middle third | $1,312,400–$2,231,300 | $120,000 | 29 | 47 |
| Upper third | $2,285,450 and up | $60,000 | 29 | 44 |
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 |
|---|---|---|---|---|
| Boulder Creek Builders LLC | 5 | 5 | $127,855 | $127,855–$127,856 |
| George Weber LLC | 5 | 2 | $118,100 | $108,429–$123,659 |
| Buildwell LLC | 4 | 2 | — | — |
| Hammerwell Incorporated | 3 | 2 | — | — |
| Melton Design Build dba Melton Construction Inc | 3 | 2 | — | — |
| Sturgell Construction | 2 | 2 | — | — |
| Cowbell Construction | 3 | 1 | — | — |
| Pearl Construction LLC | 3 | 1 | — | — |
| SL Murphy Construction LLC | 3 | 1 | — | — |
| Backyard Storage Solutions LLC | 2 | 1 | — | — |
Line your quote up against the file. In Boulder, 1 in 10 garage, ADU & accessory building filed values sit under $11,500, the middle half between $33,200 and $169,000, and 1 in 10 over $301,000.
Boulder files the fewest garage, ADU & accessory building permits in December (67 against an average month of 100) and the most in July (183). 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 Boulder →
Source: City of Boulder construction permits. 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 Boulder →
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