ADUs in Massachusetts
Accessory Dwelling Units, Fully Managed
An ADU is a self-contained living space on the same lot as your home — a finished basement apartment, a converted garage, or a new detached cottage. AWC manages the entire process: feasibility, design, permitting, and construction, so you end up with code-compliant living space without managing a single subcontractor yourself.
Types of ADUs
- Detached ADUs — a standalone unit, such as a backyard cottage
- Attached ADUs — an addition connected to the main house
- Conversion ADUs — a basement, attic, or garage converted into a unit
- Each has its own kitchen, bathroom, and private entrance
Why Homeowners Build ADUs
- Rental income to help offset the mortgage
- Multigenerational living — space for aging parents or adult children
- A home office or studio separate from the main house
- Long-term property value and flexibility
The AWC ADU Process
Feasibility & Zoning Review
We confirm what your lot and local zoning allow before you spend on design.
Design & Engineering
We develop buildable plans coordinated with architects and engineers.
Permitting
We prepare and file building permits and any required zoning relief, and represent you at hearings.
Construction
Our crews build the unit from foundation to finish on a managed schedule.
Inspection & Handover
We coordinate final inspections and hand you a ready-to-use, code-compliant unit.
Frequently Asked Questions
Do I need a permit to build an ADU in Massachusetts?
Yes. ADUs require building permits, and depending on your municipality and zoning, may require additional approvals. We handle the full permitting process for you.
How long does an ADU take to build?
Most ADUs take roughly 4–9 months from design through completion, depending on size, type, and municipal review timelines.
How much does an ADU cost?
Costs vary widely with size, type (conversion vs. detached new build), site conditions, and finishes. We provide a detailed, transparent estimate after a feasibility review.
Can I rent out my ADU?
In many Massachusetts communities, yes — rental is a common reason homeowners build. Local rules vary, and we'll help you understand what applies to your property.
Ready to Start Your Project?
Get a free estimate from AWC General Contracting. We'll walk you through the entire process — from concept to completion.