Licensed Massachusetts General Contractor

Convert Your Garage
or Basement Into a
Legal Living Space

Design, permitting, and construction for ADU conversions by licensed Massachusetts contractors. Increase your home's value, generate rental income, and create space for what matters.

Increase Property Value Up to 30%
Generate $1,500–$3,500+/month
100% Permitted & Code Compliant
Serving 30+ MA Cities & Towns

No obligation  ·  100% free  ·  Response within 24 hours

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ADU Conversions Completed
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MA Cities Served
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Average Property Value Increase
Our ADU Conversion Services

Transform Your Unused Space

Every project is designed, permitted, and built by our licensed Massachusetts team — from first consultation to final inspection.

Most Popular

Garage Conversion ADU

Turn your underused garage into a beautiful, legal apartment with full kitchen, bath, and living space — code compliant and permit-ready.

  • Full design & permitting included
  • Insulation, plumbing & electrical
  • Separate entrance option
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High ROI

Basement Conversion ADU

Transform your basement into a safe, bright, legal living space — perfect for in-laws, tenants, or a private home office suite.

  • Egress window installation
  • Waterproofing & moisture control
  • Full code compliance & permits
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ADU Design + Permitting

Architectural drawings, zoning analysis, and complete permit filing with your municipality — fully handled by our team.

  • Architectural & structural drawings
  • Zoning & bylaw analysis
  • Town approval coordination
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Why Homeowners Choose Us

More Space. More Value. More Possibilities.

More Living Space

Create legal living areas for family, guests, or long-term tenants — without the cost or disruption of moving.

Rental Income Generator

Generate $1,500–$3,500+ per month. Most conversions pay for themselves within 3–5 years in Central MA.

Increase Property Value

Increase your home's appraised value up to 30%. ADUs are the highest-ROI improvement Massachusetts homeowners can make.

100% Legal & Compliant

We handle every permit, inspection, and engineering requirement. Fully legal, insured, and code-compliant — no shortcuts.

Our Simple 5-Step Process

From Idea to Move-In Ready

We guide you through every step — design, permits, construction, and final inspection.

01

Consultation

Tell us about your space, goals, and timeline. We listen first.

02

Feasibility Review

Free property evaluation and zoning analysis — no cost.

03

Design & Permitting

Architectural plans drawn and permits filed with your city.

04

Construction

Our licensed crew builds with quality craftsmanship and care.

05

Final Inspection

100% code compliant, inspected, and move-in ready.

What Homeowners Are Saying

Real Projects. Real Results.

★★★★★

“Mass ADU Experts made the entire process smooth and stress-free. We now have a beautiful in-law apartment in our basement. Best investment we’ve ever made.”

Sarah M.Worcester, MA
★★★★★

“They handled everything from design to permits. Our garage conversion turned out better than we imagined — and our tenants moved in right on schedule.”

James T.Clinton, MA
★★★★★

“Professional, knowledgeable, and reliable. Highly recommend for anyone considering an ADU conversion. The return on investment has been incredible.”

Lisa R.Leominster, MA
Serving Massachusetts

We Cover Central & East MA

Our licensed team serves 30+ cities and towns across Central and East Massachusetts. Don’t see your city? Call us — we may still be able to help.

  • Worcester
  • Framingham
  • Marlborough
  • Shrewsbury
  • Westborough
  • Northborough
  • Clinton
  • Leominster
  • Fitchburg
  • Hudson
  • Natick
  • Ashland
  • Milford
  • Hopkinton
  • Southborough
  • Grafton
  • Millbury
  • Auburn
  • Leicester
  • Spencer
  • Holden
  • Sterling
  • Berlin
  • Bolton
  • Medfield
  • Franklin
  • Bellingham
  • Uxbridge
  • Medway
  • Wrentham
Check My Area →
  • Licensed Massachusetts General Contractor
  • Specialized in ADU Conversions Since 2009
  • Engineering & Structural Expertise
  • Permitting & MA Zoning Law Experts
  • Fully Insured — Liability & Workers’ Comp
Powered by DBG Contracting Inc. Licensed Massachusetts General Contractor
Frequently Asked Questions

Everything You Need to Know

Garage conversion ADUs in Massachusetts typically cost between $80,000 and $180,000 depending on size, finishes, and required utility work. Basement conversions usually range from $60,000 to $130,000. Contact us for a free, no-obligation estimate specific to your property.
ADU permitting in Massachusetts typically takes 4 to 12 weeks depending on the municipality. Worcester, Framingham, and most Central MA towns average 6–8 weeks. We manage the entire permitting process for you from start to finish.
Massachusetts ADU law (Chapter 40A) allows ADUs by right on most residential properties with a single-family or two-family home. Local zoning bylaws may have size, setback, and design requirements. We offer a free feasibility review to assess your specific property.
Yes. A fully permitted ADU can be legally rented as a long-term rental unit. ADUs in the Greater Worcester and Boston suburbs typically generate $1,500 to $3,500 per month in rental income, making them an excellent investment.
We offer a complete turnkey service — design, engineering, permitting, construction, and final inspection. One company, one point of contact, zero handoffs. You can also engage us for specific phases if you prefer.

Ready to Unlock Your Home’s Potential?

Get your free ADU feasibility review and take the first step toward more space, more income, and more value.

  • Free property assessment
  • No obligation, ever
  • Response within 24 hours