ADU Construction & Renovation Services in Massachusetts
FiveTen Construction & Design is an ADU contractor serving homeowners across Massachusetts. They specialize in accessory dwelling unit construction and renovation, working with clients from the initial design phase through to project completion. Their services cover a range of ADU types, helping homeowners navigate local regulations while delivering functional and code-compliant results.
An Accessory Dwelling Unit (ADU) is a smaller, independent residential living space built on the same lot as a single-family home. Adding one can be a practical way to increase usable space, support multi-generational living, or generate long-term rental income. FiveTen Construction & Design works with homeowners on several types of ADU projects, including:
- Detached ADUs – Fully independent structures that offer privacy and design flexibility, suitable for rental use, guest accommodation, or private workspaces.
- Attached ADUs – Units built onto the existing home with a separate entrance and complete amenities, sharing a wall with the main residence.
- Interior Upper Floor ADUs – Attic conversions or upper-floor additions that make use of vertical space within the existing structure.
- Above Garage ADUs – Units constructed above an existing garage to expand livable area without increasing the home's footprint.
- Garage Conversion Contractor Services – Converting an underused garage into a functional accessory dwelling unit with the necessary amenities.
- Basement ADUs – Transforming lower-level spaces into livable units, a common option for many Massachusetts homes that already feature usable basements.
ADUs in Massachusetts can be used for long-term rentals, multi-generational living arrangements, home offices, or private guest spaces. It is worth noting that short-term rentals such as Airbnb or VRBO are not permitted uses, and ADUs cannot be sold separately from the main property.
Massachusetts ADU Regulations and Building Codes
Before beginning any ADU construction or renovation project in Massachusetts, there are several regulatory requirements to be aware of. FiveTen Construction & Design helps clients understand and comply with these rules throughout the process.
Key regulations include:
- Size Limits: ADUs must be smaller than the primary residence, with a maximum size of up to 900 square feet, though this may vary by zoning district.
- Parking: An additional off-street parking space is generally required, though properties within half a mile of a transit station may be exempt.
- Separate Entrance: A distinct entrance is required, though it may share a porch or landing with the main home.
- Utilities: Separate utility connections are not mandatory, which can help reduce overall project costs.
- One ADU Per Lot: Only one accessory dwelling unit is permitted per residential lot in Massachusetts.
- Occupancy Term: A minimum rental or occupancy term of 30 days applies to any ADU.
In terms of building codes, FiveTen Construction & Design ensures all projects meet state and local requirements, including:
- 1-hour fire-rated separation between the main home and the ADU
- Adequate ventilation and natural light in all habitable spaces
- Minimum room sizes of 70 square feet with ceiling heights of at least 7 feet
- Two means of egress for emergency access
- Interconnected smoke and carbon monoxide detectors
- Compliance with Massachusetts' Stretch Energy Code for energy efficiency
What to Expect Working with FiveTen Construction & Design
FiveTen Construction & Design approaches each ADU project with a structured process designed to keep things on track from start to finish. Their services include:
Personalized Consultation: They begin by discussing the homeowner's goals, property conditions, and available options, ensuring the proposed ADU type aligns with local regulations and the client's needs.
Custom ADU Design: For basement ADUs, they develop efficient layouts and detailed renderings. For detached or attached ADUs, they assist with architectural and engineering plan reviews to ensure the design is both functional and compliant.
Transparent Budgeting: FiveTen Construction & Design provides detailed estimates and maintains clear communication around costs, material selections, and any changes throughout the project.
Permitting Assistance: As an experienced ADU contractor in Massachusetts, they manage permit applications and code compliance requirements, helping to keep the project moving without unnecessary delays.
Construction and Final Walkthrough: They oversee the build using quality materials and skilled tradespeople, and upon completion, conduct a thorough walkthrough to confirm the finished ADU meets both their standards and the client's expectations.
FiveTen Construction & Design serves homeowners in Medford, MA and the broader Greater Boston area, offering a range of accessory dwelling unit services suited to different property types and budgets.
