ADU pricing · Maine · Massachusetts · New Hampshire

Real prices for your family's ADU

Our prices are rooted in experience. We finish an ADU every week, and we know how much it actually costs families to build, whether the ADU is fully custom, a predesigned plan or needs a new water service.

150+
homes built
3 states
Maine, Massachusetts and New Hampshire
All-electric
high-performance homes, standard
8–10 weeks
of active construction
Design Path Models · Updated November 2026

Our Most Popular Base ADU Designs

Our prices are all-in, all the time. We include the civil, survey, permitting, excavation, utilities and more.

ESSENTIALS
CLASSIC
SELECT
Square Small
1 bed · 1 bath · 600 SF
$270,000
$220,000 foundation up only*
$280,000
$230,000 foundation up only*
$335,000
$275,000 foundation up only*
Square Large
2 bed · 2 bath · 900 SF
$315,000
$260,000 foundation up only*
$340,000
$285,000 foundation up only*
$420,000
$355,000 foundation up only*
S-Line
1 bed · 1 bath · 637 SF
$280,000
$230,000 foundation up only*
$300,000
$245,000 foundation up only*
$355,000
$295,000 foundation up only*

* Foundation up only is the all-in price with site work, utility connections and survey taken out, and our fees reduced to match the smaller scope.

These prices include site work and utilities in an average backyard.

Schedule a free Virtual Feasibility Study to get a customized budget for your lot.

Price and Floor Plans

Tell us a little about yourself and we'll send you our full Design Path booklet, which includes 20+ base floor plans, price ranges and our site work pricing guide.

Floor plans
20+ base designs to start from
Prices
All eight models at every finish level
Guide
Our site work pricing guide

Sample: the Square base design

Floor plan of the 600 square foot Square design with one bedroom and one bath
600 SF
1 bed · 1 bath
Floor plan of the 722 square foot accessible Square design with two bedrooms and one bath
722 SF
2 bed · 1 bath · accessible
Floor plan of the 894 square foot Square design with two bedrooms and two baths
894 SF
2 bed · 2 bath

Three of the eight Square floor plans. The booklet has the rest, from 576 SF to 910 SF, plus every other base design.

Prices for the other five models

ESSENTIALS
CLASSIC
SELECT
S-Line Small
1 bed · 1 bath · 448 SF
$•••,•••
$•••,•••
$•••,•••
Square Medium
2 bed · 1 bath · 722 SF
$•••,•••
$•••,•••
$•••,•••
L-Line Small
1 bed · 1 bath · 525 SF
$•••,•••
$•••,•••
$•••,•••
L-Line
2 bed · 1 bath · 810 SF
$•••,•••
$•••,•••
$•••,•••
Single Family Home
3 bed · 2 bath · 1,413 SF
$•••,•••
$•••,•••
$•••,•••

Get the Design Path booklet

Give us a little info about yourself and we'll send you the floor plans, up-to-date pricing and our site work pricing guide.

No strings attached. Unsubscribe any time.

Three finish levels

Essentials

The most budget-friendly finish level, but still high performance and all-electric.

Classic

Includes upgraded floors, quartz, trim and cabinets to get you started. And still high performance and all-electric.

Select

Includes everything. Premium finishes, triple pane windows and interior insulation for sound, a storage attic, LP SmartSide, and more.

Mix and match. Essentials, Classic and Select are starting points, not packages. Any finish can come from another level. The full list is in our Home Pricing Guide.

Our home budgets are all-in, all the time

Every home is full service and built to the same high-performance, all-electric standard.

Preconstruction

Building permit acquisition, permit plan sets, and civil/surveying work as required

Foundation

18" frost-protected, insulated crawl spaces (all concrete) are our baseline foundation. We also build full basements using insulated concrete forms (ICF).

Fixtures & Materials

A diverse selection from Schlage, American Standard, Moen, Merillat, MSI, Daltile, CertainTeed and more!

Site work & utilities

Foundation and utility trench excavation and backfill; water, sewer and electric connections; final grading and seeding

Mechanicals

All-electric heat pump heating and cooling, heat pump water heater, Panasonic ERV fresh-air ventilation, hardwired smoke and CO alarms

Appliances

Purchased by you, installed by our team

Structure

Multiple ceiling structures, from flat 8' ceilings to dramatic vaults; roof lines from traditional to modern; and an array of exterior aesthetic options.

Energy

All of our homes are built to high-performance, all-electric standards and earn a HERS score below 45.

Jobsite

Dumpsters, trash runs, portable toilets, fencing and post-construction cleaning

Don't care about customized plans?

If you are building a rental ADU, on a tight budget, or building multiple ADUs for your organization, we can build our pre-designed ADUs exactly as you see them. Build from our catalogue without any floor plan changes and we can discount the price by up to $15,000 – $25,000.

Ready to talk about your property?

A Feasibility Study reviews your zoning, utilities and site conditions, then gives you a budget for your project.

Request my Feasibility Study
(207) 721-2347 · info@backyardadus.com