In Massachusetts, an Accessory Dwelling Unit (ADU), including what is often referred to as an in-law apartment, must be located on the same lot as the primary residence. It can take several forms, including an internal unit such as a converted basement or attic, an attached unit that is built as an addition to the main dwelling, or a detached unit in a separate structure like a cottage or converted garage. We can help homeowners seamlessly design and build Accessory Dwelling Units, or in-law apartments, that meet Massachusetts regulations while maximizing comfort and functionality. Our team manages every step of the process—from planning and permitting to high-quality construction—ensuring the project runs smoothly. With expertise in both renovations and new builds, they create ADUs that blend seamlessly with existing homes while adding lasting value.