What Somerville owners actually declared on 14 recent basement finishing building permits in our dataset — public-record values, not quotes.
Owner-declared values from public building-permit records, residential-scale projects only (commercial and out-of-scale outliers excluded) — a benchmark, not a substitute for a contractor quote.
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Across 14 recent Somerville building permits that declared a value, the median basement finishing project value is $41,886, with a typical range of $5,500 to $98,000. These are owner-declared values from public permit records, not quotes.
Every figure is the declared project value on a real building permit filed with the Somerville building department — public records MassPermits aggregates, not estimates.