ADU · Boston
ADU Construction in Boston, MA
The highest long-term ROI of any addition.
The highest renovation labor costs in New England, the oldest housing stock in the region, and historic district review in much of the city.
ADUs are the fastest-growing residential category in 2026 for a reason: they pay for themselves. We match you with firms that build to code and to rent, detached, attached, or garage conversion, with the local ordinance know-how that makes or breaks the project.
Boston market
ADU in Boston: what the market looks like
Boston's South End, Back Bay, and Jamaica Plain neighborhoods see consistent renovation activity. The housing stock runs old and dense: brownstones, triple-deckers, and brick rowhouses with systems that require replacement alongside cosmetics. Specialty trade availability is tight.
Permits in Boston
Boston's Inspectional Services Department is thorough and can be slow. Historic district review applies in Back Bay, Beacon Hill, and the South End. The firms we match have established relationships with the ISD and local board, which is the only real way to keep a Boston project on schedule.
Boston conditions
What adu projects in Boston actually take
Boston's lot rules, setbacks, and parking requirements decide what's buildable before any design starts, so the firms we match confirm zoning feasibility on your specific parcel first. A small footprint loses heat fast, so in Boston's coastal New England winters the envelope and mechanical sizing matter more per square foot than they would on the main house.
Our standard
What we require from adu construction firms in Boston
- Detached, attached, and garage-conversion ADUs
- Built to rent: separate metering and entrances
- Local ADU ordinance and setback expertise
- Income-property finish, built to rent well for years
ADU Construction in Boston, MA: your questions
What does adu construction cost in Boston, MA?
Boston's South End, Back Bay, and Jamaica Plain neighborhoods see consistent renovation activity. For adu construction specifically: Detached 400–800 sq ft: $100k–$250k. Garage conversions: $50k–$120k. Avg build ~$180k. National range: $50,000–$250,000. In Boston, MA, costs land toward the higher end of national ranges for urban markets. Use our cost estimator for a scope-adjusted figure.
How long does adu construction take in Boston, MA?
A typical adu construction project runs 4 to 8 months. In Boston, the permit timeline matters as much as the build window: Boston's Inspectional Services Department is thorough and can be slow. The firms we match commit the completion date in writing.
What permits does adu construction require in Boston, MA?
Boston's Inspectional Services Department is thorough and can be slow. Historic district review applies in Back Bay, Beacon Hill, and the South End. The firms we match have established relationships with the ISD and local board, which is the only real way to keep a Boston project on schedule.
How do you match adu construction contractors in Boston, MA?
We vet remodeling firms in Boston before the first introduction: license verified, insurance confirmed, references called, complaint history reviewed. You describe the project, we send a short matched list of firms that work in Boston and specialize in adu construction. Free for homeowners.
Get matched for adu construction in Boston.
Tell us about your project. We hand you a short list of vetted local remodelers, free, and stay out of the rest. No phone-blasting, no pressure.