Basement Finishing Cost in Cambridge, MA
Based on 46 basement finishing building permits filed in Cambridge between 2018 and 2026, the typical declared project value is $31,904, with most landing between $21,000 and $57,350. These are real records from Cambridge's public building-permit data, declared job values, not contractor estimates or AI guesses.
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Basement Finishing values over time in Cambridge
Median declared value moved from $40,859 in 2019 to $30,000 in 2025, down 27% over that span. Each year below is computed from the filings that actually cleared in Cambridge.
Recent basement finishing permits in Cambridge
Actual filings from Cambridge's public permit records. Declared job values, not final paid prices.
| Filed | Declared value | Work described |
|---|---|---|
| 2026-03-02 | $54,000 | Interior gut of existing finished basement and slab. Pour a new slab. |
| 2025-11-12 | $25,000 | Finish the basement both in Unit 162 and Unit 164 |
| 2025-11-03 | $30,000 | Renovate existing finished basement craft and gym area. Bring electrical and plumbing up |
| 2025-09-18 | $12,500 | Remove wall and floor covering surfaces (carpet and sheetrock) in the existing finished ba |
| 2025-07-24 | $30,000 | Remodeling basement. Basement is already finished basement but we will be adding a bathroo |
| 2025-06-03 | $30,000 | Creating a finish basement |
| 2025-04-14 | $95,799 | Interior renovation of existing finished basement space. Planning to incorporate a new 3/4 |
| 2025-03-06 | $21,000 | Remodel and finish the basement as storage room only. |
| 2025-02-04 | $49,780 | Finish existing basement, including the completion of:. Existing bathroom using the existi |
| 2025-01-06 | $46,500 | Finish off basement garage area and turn into at home office and workout out room. Garage |
| 2024-11-20 | $29,198 | Finish Basement with Bath |
| 2024-10-03 | $82,500 | Excavation of the basement 20” inches refinish basement |
| 2024-07-02 | $86,000 | This renovation work order to finish section of the basement and modify 1st floor unit, 2n |
| 2024-04-17 | $18,800 | Building a new set of stairs from the first floor to the basementFraming and finish. |
| 2024-03-04 | $57,800 | Finished storage basement remodeling. Install new ceiling tiled,sprayfoam exterior walls, |
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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 Cambridge comes down to home size, materials, and scope.
Where this comes from
Every figure is pulled from Cambridge's public building-permit records and classified by the work described. Nothing is estimated or AI-generated. How the data works. The moment a Cambridge homeowner adds a real receipt, this page upgrades to show what neighbors actually paid next to these permit values.
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