ADUs Cost Guide in Maine — Average Prices & Ranges

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Across Maine, adu ranges from roughly $1,418 at the low end to $4,396 per job at the high end, with $2,497 as the usual middle.

Costs differ from one Maine metro to the next, largely because travel distance and local demand change. The city list below shows the spread.

Typical cost at a glance

United States planning figures, per job
LevelPrice
Low~$1,418
Typical~$2,497
High~$4,396

Cost by type

TypeLowTypicalHigh
Baseline transaction cost~$1,418~$2,907~$4,396
Below-median price scenario~$1,163~$2,626~$4,088
Above-median price scenario~$1,588~$3,827~$6,066
Lender and government fees~$170~$679~$1,187
Competitive or fast-moving market~$1,730~$4,206~$6,682

All figures per job.

What ADUs typically costs

Most buyers in Maine see adu quoted between $1,418 and $4,396 per job. The typical figure is close to $2,497, and that is the number worth writing into a budget before you request quotes.

How to compare quotes for adu

Cheapest is not the same as best value for adu. A slightly higher quote with a complete scope and no open-ended extras is often safer than the lowest figure with caveats.

What moves the price of adu

Labour, materials and timing explain most of the gap between two quotes for adu. Access and preparation often matter as much as the headline task, so a job that needs extra setup or a second visit costs more even when the base price looks identical.

Timing your adu

For adu, same-day and after-hours call-outs sit at the top of the range. A standard appointment booked in advance gives you the best chance of the typical figure.

Frequently asked questions

How much does adu cost?
Most adu falls between $1,418 and $4,396, with a typical figure near $2,497 per job. The low end is a straightforward job with no surprises; the high end covers complex scope, premium materials or urgent timing. It is worth testing that against a couple of quotes in Maine.
What affects the price of adu?
No single factor decides it — scope, materials, access and timing all move the total, and the biggest swings usually come from access and scheduling. Local providers in Maine can confirm how that applies to your area.
Is ADUs cheaper in smaller cities?
Often, but not always. Smaller markets can carry a travel or availability premium that offsets a lower local rate, so it is worth checking a nearby city before assuming the lowest published figure applies to you. In Maine, that is worth confirming with a local provider before you commit.
How many quotes should I get for adu?
Two or three written quotes are enough to see the real market range. Compare the same scope side by side, and ask each provider what is excluded and what would change the price after the quote is accepted. The answer can shift with the Maine market, so check locally.

Keep comparing

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These are planning ranges drawn from public price data and market research. They are not a quote, an offer or financial advice, and your actual price depends on the provider, the location and the scope of the work.