Smart Design. Practical Living. Built to Perform.
ADU Builder in Massachusetts
Accessory Dwelling Units (ADUs) are becoming an important part of housing in Massachusetts. Whether you’re creating space for family, planning for aging in place, or adding long-term flexibility to your property, an ADU needs to be designed thoughtfully and built correctly.
At Two Storey Building, we approach ADUs the same way we approach every project — with careful planning, strong structural integration, and high-performance construction.
What Is an ADU?
An ADU (Accessory Dwelling Unit) is a secondary living space located on the same property as a primary residence. It may be:
- Detached (backyard cottage or carriage house)
- Attached (addition to the main home)
- Converted space (garage or basement conversion)
Each town in Massachusetts has specific zoning requirements, dimensional limits, and permitting processes. Proper planning at the beginning makes all the difference.
Why Build an ADU?
Homeowners are building ADUs for practical reasons:
Multi-generational living
Aging-in-place solutions
Guest accommodations
Home office flexibility
Long-term property value
An ADU should feel intentional — not like an afterthought. It must integrate architecturally and function independently.
ADUs Designed for Massachusetts Conditions
New England weather demands durable construction. An ADU must be:
Properly insulated
Carefully air sealed
Designed for moisture control
Structurally engineered for snow loads
Built to meet current energy codes
Because ADUs are often smaller structures, performance matters even more. Efficient mechanical systems, insulation continuity, and ventilation strategy are critical.
Green building principles are built into every ADU we construct.
Zoning & Permitting in Massachusetts
ADU regulations vary town by town. We assist with:
- Zoning review
- Setback requirements
- Lot coverage limitations
- Utility planning
- Permit applications
- Code compliance
Early planning prevents delays and ensures the project moves forward efficiently.
Performance-Focused Design
A well-built ADU should:
- Maintain thermal separation where required
- Use efficient heating and cooling systems
- Provide proper sound control
- Incorporate durable exterior materials
- Support long-term flexibility
We treat ADUs as permanent, high-quality structures — not temporary solutions.
HOW IT WORKS
Our Design/Build Process
We keep it organized and clear.
01
Initial Consultation & Property Review
02
Zoning & Feasibility Assessment
03
Architectural Planning
04
Transparent Proposal
05
Construction & Project Management
06
Final Walkthrough & Performance Review
Performance and practicality guide each phase.
Types of ADUs We Build
Each option depends on your property layout, zoning regulations, and long-term goals.
FAQs
Frequently Asked Questions
Yes. As of Massachusetts state law updates in 2024, accessory dwelling units (ADUs) are allowed by right statewide, with many municipalities offering additional flexibility.
Typically:
- Bedroom
- Bathroom
- Kitchen
- Separate entrance
Parking (depending on municipality)
Costs depend on size, utilities, site conditions, and finishes. We provide detailed proposals after feasibility review.
Often yes, but zoning, structural, and code requirements must be evaluated.
Sometimes. Utility separation depends on town regulations and design goals.
Plan It Carefully. Build It Right.
An ADU adds flexibility and long-term value — but only if it’s designed and built correctly from the start.
If you’re considering an ADU in Massachusetts, let’s evaluate your property and create a plan that makes sense.