A Home Within Your Home
An accessory dwelling unit gives your family flexibility without moving. Whether it's an in-law suite for aging parents, a first place for an adult child, a comfortable space for long-term guests, or a source of rental income, an ADU adds independent living space with its own kitchen, bathroom, and entrance—right on your property.
Model Home Renovations designs and builds ADUs from start to finish. We evaluate your property and local requirements, handle permitting and utility connections, and manage every trade—framing, plumbing, electrical, heating and cooling, and finish work—so you have one team and one point of contact throughout the project.
An ADU can be a garage conversion, an attached unit, or a new structure. Our design-build services bring planning and construction under one roof, and if you're looking to expand the main house instead, explore our home additions. We also build the kitchens and bathrooms that make an ADU feel like home.
Types of ADUs We Build
The right ADU depends on your property, your goals, and your budget.
Garage Conversions
Turn an existing garage into a finished, insulated living space with a kitchen, bathroom, and private entrance.
Above-Garage Units
Build a second-floor apartment over a new or existing garage to add living space without expanding your footprint.
Attached ADUs
An addition connected to the main house with its own entrance—ideal for in-law suites and multigenerational living.
Detached ADUs
A standalone cottage on your property, offering the most privacy for family members, guests, or tenants.
Interior Conversions
Convert a basement or underused portion of your home into a self-contained living unit.
Kitchens & Baths
Compact or full kitchens and complete bathrooms designed to make the most of every square foot.
Why Homeowners Add an ADU
Multigenerational Living
Keep aging parents or adult children close while giving everyone their own space and privacy.
Rental Income
A long-term rental unit can help offset your mortgage and other costs of owning your home.
Flexible Space
Use it as a guest suite, home office, or studio today and adapt it as your family’s needs change.
Added Property Value
A well-built, permitted living unit adds usable square footage and broadens your home’s appeal.
Our ADU Process
Site Evaluation
We visit your property, discuss how you plan to use the ADU, and review zoning, utilities, and site conditions.
Design & Permitting
Floor plans, finish selections, a detailed proposal, and permit applications—all handled by our team.
Construction
Foundation, framing, utilities, and finish work completed in sequence, with regular updates along the way.
Final Walkthrough
We review every detail with you, complete final inspections, and hand over a move-in-ready living space.
ADU Prices — South Shore Massachusetts
Basic ADU*
Starting at
$175,000
Includes converting approximately 400 sq. ft. of existing garage or interior space into a fully functional accessory dwelling unit with a bathroom, compact kitchen, living area, updated electrical and plumbing, heating and cooling, and a private entrance.
Average ADU*
Starting at
$275,000
Includes constructing an approximately 500–700 sq. ft. accessory dwelling unit with a full kitchen, bathroom, bedroom, living area, upgraded finishes, and a private entrance. May include an outdoor deck or patio.
High-End ADU*
Starting at
$400,000+
Includes constructing a custom-designed accessory dwelling unit of approximately 700–900 sq. ft. with a fully customized kitchen, luxury bathroom, spacious living area, premium flooring, custom cabinetry, and high-end finishes. May also include architectural enhancements, private outdoor living space, and extensive site preparation.
Pricing Disclaimer: The prices listed are intended as general budgeting guidelines for accessory dwelling units on the South Shore of Massachusetts and are not fixed quotes or guaranteed starting costs. Actual pricing will vary based on the size and type of ADU, existing conditions, foundation requirements, utility connections, site preparation, material selections, and overall scope of work. A detailed proposal will be provided following a project consultation.
Areas We Serve
We provide accessory dwelling unit construction throughout Plymouth, Kingston, Duxbury, Marshfield, and surrounding South Shore communities.
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