Accessory Dwelling Unit (ADU) Contractors in Massachusetts
Design, Permit & Build Your Accessory Dwelling Unit — From Concept to Keys
Massachusetts ADU Experts — Full-Service Design & Build
Regulus Construction is a licensed, full-service ADU builder serving MetroWest Massachusetts and surrounding communities. We handle every phase of your accessory dwelling unit project — from initial feasibility assessment and architectural design through municipal permitting, construction, and final inspection.
Whether you are building a detached backyard cottage, converting an existing garage, or adding an attached in-law suite, our team brings deep knowledge of Massachusetts ADU regulations, local zoning bylaws, and the building code requirements that vary from town to town across our service area.
Since Massachusetts passed the ADU-by-right legislation, homeowners across the state have gained new opportunities to add living space, generate rental income, or house aging family members close to home. Regulus Construction has been at the forefront of this movement, helping families navigate the process with confidence.
Types of ADUs We Design & Build
Detached Backyard ADU
A standalone cottage built in your backyard, offering complete privacy and independence. Ideal for rental income, a home office, or multigenerational living.
Garage Conversion ADU
Transform your underused garage into a fully finished living space. A cost-effective way to add an ADU without new foundation work.
Attached In-Law Suite
A seamless addition to your existing home with its own private entrance, kitchen, and bathroom. Perfect for aging parents or adult children.
Why Homeowners Choose Regulus Construction for ADUs
- Licensed & insured Massachusetts general contractor
- Deep expertise in local ADU zoning bylaws across 40+ towns
- Full-service: design, engineering, permitting & construction
- Transparent fixed-price contracts with no hidden fees
- Energy-efficient builds meeting MA Stretch Code standards
- Dedicated project manager from start to finish
ADU Builders — Towns We Serve
Click your town below to learn about local ADU zoning requirements, project costs, and how Regulus Construction can help you build.
ADU Contractors Serving Massachusetts Homeowners
Regulus Construction is a Massachusetts-based contractor specializing in detached ADUs, garage conversions, and in-law suites. As your trusted General Contractor Milford MA, our team brings deep expertise in accessory dwelling unit design and construction, guiding homeowners through every phase — from initial concept and permitting to final inspection. We ensure full compliance with Massachusetts 780 CMR building code on every project, so your ADU is built safely, legally, and to last.
As licensed ADU builders in Massachusetts, we proudly serve communities throughout MetroWest and beyond. Our service area includes: Attleboro, Bellingham, Blackstone, Dover, Easton, Foxborough, Framingham, Franklin, Grafton, Holliston, Hopedale, Hopkinton, Mansfield, Medfield, Medway, Mendon, Milford, Millis, Millville, Natick, Norfolk, North Attleboro, Northbridge, Norton, Plainville, Sherborn, Southborough, Sudbury, Upton, Uxbridge, Walpole, Wayland, Wellesley, Westborough, Weston, Westwood, and Wrentham.
FAQ — ADU Contractors Massachusetts
Do I need a contractor to build an ADU in Massachusetts?
Yes. In Massachusetts, building an ADU requires compliance with the state building code (780 CMR), local zoning bylaws, and a building permit issued by your municipality. A licensed contractor is required to pull permits and ensure structural safety. Regulus Construction handles the entire permitting process on your behalf, ensuring your ADU meets all Massachusetts 780 CMR requirements and local zoning regulations from foundation to finish.
What types of ADUs can an ADU builder in Massachusetts construct?
As an experienced ADU builder in Massachusetts, Regulus Construction designs and builds detached ADUs (backyard cottages), attached ADUs (in-law additions), garage conversion ADUs, and basement ADUs. Each type has distinct zoning and code requirements. We assess your property, advise on the best ADU type for your goals, and manage the full design-build process.
How long does it take to build an ADU in Massachusetts?
The timeline to build an ADU in Massachusetts typically ranges from 6 to 12 months, depending on the type and complexity of the unit. The permitting phase alone can take 4–8 weeks. Regulus Construction streamlines this process by managing all permit applications, design approvals, and construction scheduling, helping you get from concept to occupancy as efficiently as possible.
Ready to Build Your ADU?
Schedule a free consultation with our ADU specialists. We will assess your property, review local zoning, and provide a detailed project estimate — all at no cost.