MA ADU GUIDE
Your Guide to Building an ADU in Massachusetts
Understand your property. Learn the rules. Explore costs and planning. Know what to do next.
THE BASICS
What Is an ADU?
An accessory dwelling unit is a smaller, independent home located on the same property as a primary residence. Massachusetts homeowners consider ADUs for family, aging in place, rental flexibility and making better use of an existing property.
ADUs may be detached, attached, created within a home or built by converting existing space.
LOCAL CONTEXT MATTERS
Explore Local ADU Guides
Town-specific ADU rules, permitting information, property considerations, and official local resources. More town guides are being added.
Explore Town ADU Guides →
FEATURED CENTRAL MASSACHUSETTS ADU BUILDER
Professional Help When You’re Ready
McNamara Building Co. is the initial featured builder serving Central Massachusetts. Additional verified professionals may be featured for other service areas as MA ADU Guide grows.
Builder details, service territory and project information will be added after verification.
Talk to an ADU ProfessionalDisclosure: MA ADU Guide is operated by McNamara Contracting. The featured builder above is affiliated with the operator, not independently ranked. Future paid or exclusive placements will be disclosed where they appear.