Why Maine is an ADU market worth owning.
The law, the search demand and the ad costs for Maine, with a source under every number.
Fig. 1 · The law
Maine ADU law in 2026
- Towns must allow an ADU on any lot with an existing single family home
- Towns must allow at least 190 square feet. Many allow 800 to 1,000
- New ADUs do not require additional parking
- Set by LD 2003, passed in 2022
- Larger cities had to comply by January 1, 2024. Smaller towns by July 1, 2024
- Local rules that conflict with the law can be challenged as invalid
From Portland to Bangor, homeowners with a single family house now have the right to add an ADU.
Sources: The Maine Monitor · Maine DECD, LD 2003
Fig. 2 · The proof it's real
219
Monthly Google searches for "adu maine". Strong for a state of 1.4 million people.
Per person, Maine homeowners search for ADUs harder than most of the country.
Source: SearchAtlas keyword data, Oct 2026
Fig. 3 · Google cost per click, Maine
What Maine builders pay Google for one click
$3.54backyard adus maine
$2.42maine accessory dwelling unit
$1.91adu maine
That's one click. Not a call. We reach Maine homeowners on Facebook and Instagram before they ever search.
Source: SearchAtlas, average cost per click, Oct 2026
Fig. 4 · Monthly Google searches
ADU search demand in Maine
maine accessory dwelling unit90
A lot of these searches are about the law. Homeowners know they can build now and are figuring out how.
Source: SearchAtlas keyword data, US monthly searches, Oct 2026
Fig. 6 · Fit check
Who we work with in Maine
- Custom home builders ready to add ADUs as a service line
- Remodelers who want bigger tickets than kitchen and bath jobs
- GCs with a crew and subs that can handle a 400 to 1,200 square foot build
- ADU builders in Portland, Lewiston, Bangor and South Portland who want more volume
Never built one but you've got the license, the crew and the subs? You're who we want to talk to.
Fig. 7 · Questions
Maine ADU marketing FAQ
Are ADUs legal in Maine?
Yes. Under LD 2003 (2022), every Maine town must allow an ADU on any lot with an existing single family home, must allow at least 190 square feet, and cannot require additional parking. Towns had to comply by 2024.
How many people search for ADUs in Maine?
About 463 searches a month across the ADU keywords we track for Maine, led by "adu maine" at 219 a month (SearchAtlas, October 2026). Most of that demand is in Portland, Lewiston, Bangor and South Portland.
How does Maverix market ADU builders in Maine?
We run Meta ads to homeowners in your service area, our call rep screens every lead for ownership, budget, financing and timeline, and the ready ones get booked on your calendar. One ADU builder per market. You pay ad spend straight to Meta.
Other markets
ADU marketing in other states
Maine opened ADUs to any lot with a single family home. The builders who get in front of homeowners now are the ones they call.