Basement Finishing Cost in Somerville, MA
Based on 107 basement finishing building permits filed in Somerville between 2015 and 2026, the typical declared project value is $25,000, with most landing between $16,250 and $49,000. These are real records from Somerville's public building-permit data, declared job values, not contractor estimates or AI guesses.
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Basement Finishing values over time in Somerville
Median declared value moved from $26,350 in 2018 to $25,000 in 2024, down 5% over that span. Each year below is computed from the filings that actually cleared in Somerville.
Recent basement finishing permits in Somerville
Actual filings from Somerville's public permit records. Declared job values, not final paid prices.
| Filed | Declared value | Work described |
|---|---|---|
| 2026-04-14 | $50,000 | Removal of drywall in finished basement to expose all existing electrical and plumbing |
| 2026-04-10 | $55,000 | Create a bedroom and a 3/4 bathroom in a finished basement |
| 2025-10-01 | $41,518 | Owens Corning Basement Finishing System. This is a 100 percent finished basement at this t |
| 2025-09-22 | $39,880 | Adding a bathroom (shower, sink, toilet) to an existing finished basement. |
| 2025-07-28 | $42,000 | Remodel finished basement do to water damage |
| 2025-03-27 | $11,180 | UPDATING THE FINISH BASEMENT SPACE ACCORDING TO THE ATTACHED ARCHITETURE PLANS. NEW PLANS |
| 2024-12-30 | $12,000 | Remodel of previously finished basement, additional outlets and lighting for first floor |
| 2024-08-08 | $70,600 | finish existing basement adding a bathroom |
| 2024-08-07 | $20,000 | create interior stairs between 1st fl. and finished basement (Homeowner Permit) |
| 2024-07-30 | $10,000 | Renovate existing finish basement space, |
| 2024-07-15 | $18,000 | Finish Basement, Wire Gym, Office, Wet Bar, Family Room and Bathroom; Upgrade Service; Rel |
| 2024-07-11 | $70,000 | Finish existing basement as an extension of first floor unit: 3 beds, 2 baths, laundry and |
| 2024-05-16 | $51,000 | Basement Finishing / 2-Family to Single Conversion IN ADDITION TO B24-000461 |
| 2024-04-04 | $30,000 | DEMOLISH AN ILLEGAL FINISHED BASEMENT Correct Violation File # 24-000291 |
| 2023-07-28 | $70,000 | Finish Basement, extend living into basement |
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Add your price →How to read these numbers
A permit's declared value is the job cost the owner or contractor stated when they pulled the permit. It tracks the real cost of the work but can run a bit under what was actually paid, since it often leaves out some labor and finish costs. Treat the range as a grounded starting point. What basement finishing actually costs in Somerville comes down to home size, materials, and scope.
Where this comes from
Every figure is pulled from Somerville's public building-permit records and classified by the work described. Nothing is estimated or AI-generated. How the data works. The moment a Somerville homeowner adds a real receipt, this page upgrades to show what neighbors actually paid next to these permit values.
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