Custom Home Additions in Salem, NH
Expand Your Living Space Without Moving
Running out of room in your current home? A professionally built home addition by GWJ Boss Construction can give you the space you need — without the hassle of moving. Based in Salem, NH, we specialize in designing and building seamless additions that match your home’s structure, style, and function.
From in-law suites and sunrooms to garages and second-story expansions, we help homeowners maximize square footage while increasing home value and comfort.
Our Home Addition Services
Attached & Detached Garages
We build fully framed, weather-tight garages for vehicles, storage, or workshop space. Choose from single-car, double-car, or custom layouts with optional second-story space.
In-Law Suites & Guest Rooms
Create a private, self-contained space for family or long-term guests. We handle everything from framing to plumbing and finishing.
Sunrooms & Enclosed Porches
Enjoy the beauty of New England seasons in a bright, cozy sunroom built to last. We customize layouts and materials to your preferences.
Second-Story Additions
Want to build up instead of out? We can add a second level to expand bedrooms, bathrooms, or bonus space — all integrated with your existing home.
Custom Room Expansions
From larger living rooms and kitchen extensions to mudrooms and office space, we design and build based on your specific needs and home layout.
Seamless Construction from Start to Finish
At GWJ Boss Construction, we make the home addition process easy and worry-free:
- We listen to your vision and provide honest guidance
- We create a detailed plan that includes materials, timeline, and budget
- We handle permits, inspections, and structural tie-ins
- We deliver clean, high-quality work that blends beautifully with your home
Everything is done in-house by skilled craftsmen who take pride in their work — no shortcuts, no surprises.
Why Choose GWJ Boss Construction?
Experienced in structural framing and integration
Licensed & insured in NH
Local knowledge of zoning and permitting
Friendly, respectful, and communicative team
High-quality materials and detail-driven execution
We build additions as if they were our own — with long-term durability and your satisfaction in mind.
Hear From Our Clients
“GWJ Boss Construction built an in-law suite for my parents and it turned out better than we imagined. Professional, timely, and incredibly clean work.”
Amanda R., Facebook Review
“We needed a garage added to our home and Gary’s team made it look like it was always there. Seamless work and great service.”
Brian H., Facebook Review
“They added a sunroom to our house and we spend all our time there now. We love it. Highly recommend GWJ Boss Construction!”
Lisa F., Facebook Review
FAQs About Home Additions
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How long does it take to build a home addition?
Timelines vary by size and complexity. A garage may take 2–3 weeks; larger or multi-room additions may take 6–10 weeks or more.
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Will my addition match the existing structure?
Yes — we specialize in framing and siding that tie in perfectly with your home’s style and materials.
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Do you handle permits and design?
Yes, we take care of all building permits and help you through the design process with practical, cost-effective recommendations.
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What’s the best addition for resale value?
In-law suites, garages, and sunrooms offer strong ROI, but we help you choose based on both value and how you use your space.
Build the Space You Need with GWJ Boss Construction
When you’re ready to add space and value to your home, trust GWJ Boss Construction for expert home additions in Salem, NH. We build with quality, care, and your future in mind.
General Contractor | Salem, NH
Contact Us
Serving Southern New Hampshire & Northern Massachusetts
Open 7 Days a Week | 8:00 AM – 7:00 PM
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