How much does home addition cost in Somerville? The usual addition job filed with Somerville is $167,060, from 114 priced permits (October 2023 through September 2026); the middle half of firms file between $50,000 and $286,996. A filed value is what the contractor wrote on the permit, not a quote or the final bill.
The usual addition job filed with Somerville is $167,060, from 114 priced permits, October 2023 through September 2026. The middle half of firms usually file between $50,000 and $286,996. 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 472 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 114 priced permits across 77 firms, pooled into one. Half of Somerville addition permits were filed between $41,900 and $400,000.
| Percentile | Filed value | Reads as |
|---|---|---|
| 10th | $13,100 | 1 in 10 permits filed below |
| 25th | $41,900 | 1 in 4 filed below |
| 50th | $184,000 | the middle permit |
| 75th | $400,000 | 1 in 4 filed above |
| 90th | $594,000 | 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: City of Somerville FY2025 assessed values.
| Firms working on | Usual home value | Usual filed value | Firms | Permits |
|---|---|---|---|---|
| Lower third | under $929,700 | $225,000 | 25 | 35 |
| Middle third | $929,700–$1,136,800 | $83,900 | 26 | 43 |
| Upper third | $1,173,800 and up | $267,000 | 26 | 36 |
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 |
|---|---|---|---|---|
| Sal Querusio | 5 | 3 | $50,000 | $40,000–$582,861 |
| North Heritage Construction Corp | 4 | 3 | — | — |
| Lacourt Realty LLC | 3 | 3 | — | — |
| Up Design & Build, LLC | 3 | 2 | — | — |
| Abiatar Construction | 2 | 2 | — | — |
| Acvp Design | 2 | 2 | — | — |
| Hadley Contracting Inc | 2 | 2 | — | — |
| Ivyprop Group LLC | 2 | 2 | — | — |
| Lin Construction LLC | 2 | 2 | — | — |
| Seeair | 2 | 2 | — | — |
Line your quote up against the file. In Somerville, 1 in 10 addition filed values sit under $13,100, the middle half between $41,900 and $400,000, and 1 in 10 over $594,000.
Somerville files the fewest addition permits in May (53 against an average month of 100) and the most in October (147). 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 Somerville →
Source: City of Somerville permit applications (issued permits only). 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 Somerville →
Addition cost in other cities: Orlando Cincinnati Miami Minneapolis Denver San Diego Honolulu Albuquerque Boulder Greensboro Saint Paul Arlington, VA Scottsdale Cary Naperville Bellevue Cape Coral Bellingham Bend San Francisco Anaheim Columbus, OH Marin County (unincorporated)
Other job costs in Somerville: Electrical · Remodel & Repair · Insulation & Weatherization · Roofing · HVAC & Sheet Metal · Windows, Doors & Siding · Solar · Deck & Porch · New Home