Heritage Design Build
Waltham, MA
4.6(20)
ADU ConstructionGarage Conversion
Specializing in ADU construction and related services in Waltham, MA.
Looking for the best in-law suite builders in Waltham, Massachusetts? Our directory features 2 vetted in-law suite builders serving the Waltham area. Whether you're planning a new ADU construction, garage conversion, or backyard cottage, find the right builder for your project.
Specializing in ADU construction and related services in Waltham, MA.
Mass ADU is a Massachusetts-based Accessory Dwelling Unit (ADU) construction company focused on helping homeowners build for the future.
Waltham is one of the top markets for accessory dwelling units in Massachusetts. With growing demand for affordable housing, ADU construction in Waltham offers homeowners an excellent opportunity to add living space, generate rental income, or house family members. Our curated list of in-law suite builders in Waltham helps you find experienced professionals who understand local building codes, zoning regulations, and permit requirements.
ADU construction costs in Waltham typically range from $150,000 to $350,000 depending on size, design, and finishes. Garage conversions are generally less expensive ($80,000–$150,000), while custom-built detached ADUs can cost more. Get free quotes from our listed in-law suite builders to compare prices.
Yes, ADU construction in Waltham requires building permits. Massachusetts has specific ADU regulations, and local zoning laws may have additional requirements. Our listed builders can help you navigate the permitting process.
ADU construction timelines in Waltham typically range from 4–12 months, depending on the project type. Prefab ADUs can be installed in 2–4 months, while custom builds may take 8–12 months including design and permitting.