Home Addition Contractor in Massachusetts
Need more space without moving? We design and build room additions, second-story additions, in-law suites, and bump-outs that blend seamlessly with your home. Call (774) 512-3176.
Professional Home Additions in Massachusetts
A home addition is one of the smartest investments a Massachusetts homeowner can make — more living space, higher property value, and no need to leave the neighborhood you love. RS Development Group designs and builds additions from the foundation and framing up: room additions, second-story additions, in-law suites (ADUs), garage conversions, sunrooms, and bump-outs. Because structural framing is our specialty, we tie new space into your existing home so it is square, solid, and looks like it was always there.
What We Offer
- Room AdditionsAdd a bedroom, family room, home office, or expanded kitchen.
- Second-Story AdditionsBuild up and double your space without losing your yard.
- In-Law Suites / ADUsAccessory dwelling units for family or rental income.
- Garage ConversionsTurn an underused garage into finished living space.
- Sunrooms & Bump-OutsExpand a kitchen or add a light-filled sunroom.
- Mudrooms & EntrywaysFunctional additions built for New England living.
How It Works
Our Home Additions Process
Simple, transparent, and stress-free from first call to final walkthrough.
Free Consultation
Call us or fill out our form. We’ll discuss your project needs and schedule a site visit at your convenience.
Detailed Estimate
We provide a comprehensive written estimate with transparent pricing. No hidden fees, no surprises.
Expert Construction
Our skilled team executes your project with precision, keeping you informed every step of the way.
Final Walkthrough
We walk through the completed project together, ensuring everything meets your expectations.
The RS Difference
Why Choose RS for Home Additions
Licensed & Insured
Fully licensed (MA HIC #216507) with comprehensive liability and workers’ comp coverage.
5-Star Rated
A perfect 5-star Google rating from satisfied Massachusetts homeowners.
On-Time, On-Budget
Transparent written estimates with no hidden fees, delivered on schedule.
Free Estimates
No-obligation, detailed quotes after a free on-site walkthrough.
Thinking about home additions?
Get a free, no-obligation on-site estimate with a clear written quote.
Licensed MA HIC #216507 · Free & no obligation · or email info@rs-developmentgroup.com
Portfolio
Recent Home Additions Projects
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Testimonials
What Our Customers Say
About RS Development Group
A Marlborough Contractor Built on Structural Expertise
Founded in 2008 by Rogerio Alves, RS Development Group has grown from a specialist framing crew into a full-service general contractor serving 109 cities and towns across Massachusetts.
What sets us apart is where we started: structural framing. Because we understand how a home is built from the skeleton out, every roof, addition, deck, siding job, and remodel we take on is handled with a structural awareness most contractors simply don’t have — which means fewer surprises, cleaner tie-ins, and work that lasts.
We’re fully licensed (MA HIC #216507) and insured, and we back every job with honest, written pricing and a schedule we keep. That’s how we’ve earned a perfect 5-star rating from 27 homeowners across the region.
- Fully licensed — MA HIC #216507
- General liability & workers’ compensation insured
- Family-owned and operated since 2008
- Perfect 5-star rating across 27 verified reviews
- Free, written, itemized estimates — no surprises
- Every project built to code and finished on schedule
Since 2008
Serving Massachusetts
5★
27 Verified Reviews
109
Massachusetts Cities & Towns Served
Licensed
MA HIC #216507
Answers
Home Additions FAQ
Home addition cost in Massachusetts varies widely by type (room addition vs second-story vs in-law suite), square footage, foundation work, rooflines, and interior finishes. Every project is unique. RS Development Group provides a free, written, itemized estimate after an on-site walkthrough — call (774) 512-3176 to schedule.
Home Additions is available in 109 Massachusetts cities & towns — find yours
MetroWest
Central Massachusetts
Greater Boston
Blackstone Valley
South Shore
Nashoba Valley
North Shore
Merrimack Valley
Related Services
Get Your Free Home Additions Estimate
Tell us about your project — we'll walk the site, give you a clear written quote, and a real timeline. No pressure, no surprise charges.
- Licensed MA HIC #216507 & fully insured
- 5-star rated · 27 Google reviews
- Free on-site estimate · clear written quote · no obligation