Accessory dwelling unit contractor — Cambridge, MA
Last updated: September 24, 2026
What affects the price
Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.
About this service
A contractor manages the trades, materials, and timeline required to complete your backyard home. You need a contractor when you have design plans ready or need a lead to coordinate electricians, plumbers, and carpenters to get the structure move-in ready. They act as your project manager, ensuring that the work is finished on schedule and adheres to the building plans filed with your local municipality. Their role is essential for keeping the construction phase organized and safe.
Frequently asked in Cambridge
What are the requirements for ADU housing in Cambridge?
ADU housing in Cambridge, Massachusetts, must comply with the city's specific zoning ordinances, which govern factors like size, setbacks, and lot coverage. State building codes for safety and habitability must also be met. Typically, ADUs require independent utility meters and must be located on a lot with an existing single-family dwelling, with specific provisions for parking.
What are the benefits of homes with in-law suites in this area?
Homes with in-law suites in Cambridge offer significant advantages, including supporting multi-generational living arrangements and providing independent housing for family members. They can also generate rental income, increasing property value and return on investment in a high-demand real estate market. These suites offer privacy and convenience for occupants.
What is involved in building a backyard accessory dwelling unit?
Building a backyard accessory dwelling unit involves site planning to comply with Cambridge's zoning bylaws regarding setbacks and lot coverage. Construction includes foundation work, framing, roofing, and the installation of plumbing, electrical, and HVAC systems. Interior and exterior finishing ensures the unit is habitable and meets all building code requirements.
How do I find an ADU builder in Cambridge?
What are the advantages of an ADU near me?
An ADU near you offers increased property utility and value, providing additional living space for family members or potential rental income. In dense urban areas like Cambridge, ADUs are an efficient way to maximize existing lot potential. They can offer more affordable housing options within desirable neighborhoods.
What is available for a 24-hour ADU service?
While '24-hour ADU service' typically refers to emergency repair availability for existing ADUs, the construction and permitting process itself follows standard business hours. For new construction or significant renovations, scheduling and project timelines are established with the construction team. Emergency services are distinct from the development phase.
What are the accessory dwelling unit grants available in Massachusetts?
Massachusetts has several programs designed to encourage ADU development, including potential grants or low-interest loan programs aimed at homeowners. These initiatives can help offset the costs of design, permitting, and construction. It is advisable to check with the Massachusetts Department of Housing and Community Development and local municipal resources for current offerings.
Also serving nearby: Newton · Boston · Quincy · Lynn · Brockton
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Cambridge — population 118,214; about 18,479 residents per square mile across 6.4 sq mi. ZIP codes covered include 02138, 02139, 02140, 02141, 02142, 02238.
Neighborhoods served in Cambridge: Central Square, Inman Square, Porter Square, Harvard Square, Kendall Square — and every surrounding area.
Areas we serve
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California (4)
All of California · Fairfield · Murrieta · Richmond · Vallejo