Whole House & Additions · Greater Boston
In-law apartment (ADU)
Managed for you.
Massachusetts now allows accessory dwelling units by right in most single-family zones, subject to local rules. We help you check feasibility, coordinate design and permits, and manage the build.
What We Handle
Your side of the project.
- Zoning and feasibility review
- Coordinating design and engineering
- Bid comparison from vetted general contractors
- Budget and schedule tracking
Who Does the Work
Independent licensed pros under contract with you. We vet them and manage them.
- Architects or designers
- Licensed general contractors
- All licensed trades
Budget
Typical budget ranges.
Rough Greater Boston ranges paid to contractors, for planning only. Real prices come from your bids. Our consulting fee is separate.
- Under $150,000
- $150,000 to $250,000
- $250,000 to $400,000
- Over $400,000
Good to Know
Before you start.
Design and permits for larger projects usually take 3 to 6 months before work starts.
- State law allows ADUs by right in most single-family zones, up to 900 square feet or half the size of the main home, whichever is smaller. Towns can still set rules on things like design and setbacks.
- ADUs need separate utilities planning and code-compliant egress.
FAQ
In-law apartment (ADU) questions.
Do I need a special permit for an ADU?+
In most single-family zones, a protected ADU is allowed by right, but you still need building permits and must meet local rules.
Attached or detached?+
Attached units often cost less. Detached units give more privacy. We will price both.
More Whole House & Additions
Related projects.
Start your in-law apartment (adu) project.
Tell us about it in about a minute. The first consultation is free.