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ADU (Accessory Dwelling Unit) Project Costs in Bourne, MA

What Bourne owners actually declared on 23 recent ADU building permits in our dataset — public-record values, not quotes.

$25,000
Median project value
$8,000–$125,000
Typical range
23
Permits analyzed

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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FAQ

How much does a ADU project cost in Bourne, MA?

Across 23 recent Bourne building permits that declared a value, the median ADU project value is $25,000, with a typical range of $8,000 to $125,000. These are owner-declared values from public permit records, not quotes.

Where does this cost data come from?

Every figure is the declared project value on a real building permit filed with the Bourne building department — public records MassPermits aggregates, not estimates.