ADU builder in Central Maine framing an accessory dwelling unit

ADU Builder in Central Maine

Standalone or garage-integrated accessory dwelling units, built with full residential systems.

  • 6Years building across Central Maine
  • 30+Homes built, start to finish
  • 1Owner who walks every job

An ADU is an accessory dwelling unit: a second small home on your property, either standalone or built into a garage. Garage Builders Maine builds them across Kennebec and Lincoln County, in towns like Augusta, Waterville, Gardiner, Winthrop, and Wiscasset.

These are full homes with real plumbing, electrical, and HVAC, not a stripped-down mini-build. Every ADU starts with zoning, and the owner handles those conversations with your town before we design anything.

The owner also walks your lot in person first, then gives you a straight answer on what fits and what it costs. Standalone or garage-integrated, priced for your property.

Why homeowners pick us

We build the ADU your property and your local zoning actually allow, not a generic model pulled off a catalog.

  • Zoning checked with your town before we design anything
  • Full residential systems, not a stripped-down mini-build
  • Standalone or garage-integrated, priced for your lot
Owner handles zoning conversations directlyFull plumbing, electrical, and HVAC systemsKennebec and Lincoln County focused
garage-integrated ADU build in Central Maine

Reviews

What homeowners say

★★★★★

Very quick, efficient, and enjoyable to work with. Everyone was so friendly, and I was so pleased with the way it came out.

E.R., home remodel
★★★★★

Did an amazing job on our new bathroom remodel.

A.G., bathroom remodel
★★★★★

Overall, the experience was overwhelmingly positive, marked by consistently excellent communication.

D.K., general construction project

Find the shop

Our shop in Augusta, ME

219 Capitol St. Ste. 8
Augusta, ME 04330

Zoning and site evaluation, before design

ADU rules vary town by town in Maine, and they change more often than most other permitting categories. We check current local zoning with your town before we design anything, rather than assuming a blanket rule applies.

Standalone versus garage-integrated

A standalone ADU gives you full site placement flexibility. A garage-integrated unit shares structure with an existing garage, which can lower cost but depends on what that garage can support.

Full systems, not a shortcut build

Plumbing, electrical, and HVAC all get sized for year-round occupancy, not a seasonal guest space. Septic capacity is a common gating factor on rural lots, and we check it early.

How it works

  1. Get your free estimate.

    We check zoning and site conditions with you before design.

  2. We build it.

    Standalone or garage-integrated, full systems, one crew.

  3. Final walkthrough.

    You inspect the finished unit before it's occupied.

kitchenette installation inside a Central Maine ADU

Worth knowing

What an ADU build actually involves

An accessory dwelling unit is a small, self-contained living space, separate from your main home, built either standalone or attached to a garage.

Standalone ADUs sit on their own foundation, giving you the most flexibility on placement but requiring a full utility run if one isn't already nearby.

Garage-integrated ADUs build living space above or alongside an existing garage, which can share some structure and utility runs, lowering cost, but depends heavily on what your current garage can support.

Full kitchen versus kitchenette changes both cost and how the space can legally be used, since some towns treat a full kitchen differently in their ADU ordinance.

Site utility work, new well or septic capacity versus tying into existing systems, is one of the biggest hidden cost variables on rural Kennebec and Lincoln County lots.

When to start: ADUs carry a longer lead time than most projects because of permitting and full residential-systems scope. Plan on 2 to 4 months minimum before groundbreaking, and confirm zoning with your town before you get attached to a design.

standalone ADU under construction on a Central Maine property

Homeowners housing aging parents or adult children, wanting rental income, or adding a home office or guest space that's genuinely separate from the main house.

How much an ADU costs in Maine

Treat the numbers below as ranges, not a firm quote.

ADU typeTypical sizeEstimated range*
Garage-integrated, kitchenette400 to 600 sq ft$65,000 to $110,000
Standalone, full kitchen500 to 800 sq ft$110,000 to $190,000
Standalone, larger unit800 to 1,000 sq ft$180,000 to $260,000

Standalone versus attached, full kitchen versus kitchenette, and site utility work (new well or septic versus existing tie-in) move these ranges significantly.

Common questions

Why homeowners trust us

Good to know

Frequently asked questions

Rules vary town by town and change more often than most permitting categories. We confirm current zoning with your specific municipality before design, rather than assuming a blanket rule applies.

Next step

Ready to talk about your ADU

Reach out and we'll check zoning and site conditions with you and give you a straight answer on what's realistic.