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

What Plymouth owners actually declared on 12 recent ADU building permits in our dataset — public-record values, not quotes.

$305,000
Median project value
$250,000–$400,000
Typical range
12
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 Plymouth, MA?

Across 12 recent Plymouth building permits that declared a value, the median ADU project value is $305,000, with a typical range of $250,000 to $400,000. 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 Plymouth building department — public records MassPermits aggregates, not estimates.