Additions & Custom Builds on the South Shore
Home additions, outbuildings, pool houses, and custom exterior structures — framed, sided, roofed, and finished from the ground up.
What additions & custom builds cover — and who it's for.
This is whole-structure work — foundations and framing, then siding, roofing, trim, doors, and windows brought together into a finished build. It's for homeowners who need more space or a new structure on the property: an addition that grows the home, or an outbuilding like a shed, pool house, or garage that has to look and last like it belongs.
Additions & custom builds we offer.
Home additions
Bump-outs, room additions, and second-story builds tied cleanly into the existing home.
Sheds & outbuildings
Custom sheds and storage buildings framed, sided, and roofed to match the property.
Pool houses & cabanas
Poolside structures and equipment buildings built to handle sun, water, and weather.
Framing & new construction
Foundations, footings, and structural framing done right, to code, from the ground up.
Why homeowners pick us for additions.
A custom build only works if every trade ties together — framing, roofing, siding, and trim. Because we self-perform the full exterior, a new structure comes out square, weather-tight, and matched to your home, instead of a patchwork of subs who never see the whole picture.
With 30+ years on the South Shore, we've framed and finished everything from additions to standalone outbuildings, handling the structure underneath and the finish you actually see.
Built to match
Siding, trim, and roofline matched so new work belongs with the home.
One crew, full scope
Framing through finish handled in-house, not split across subcontractors.
Solid structure
Foundations and framing built to code so it stays square and dry for decades.
How a custom build goes.
We plan the structure, handle permitting, and build in the right order — structure first, then the finish work you'll see and use.
1. Design & permit
We plan the layout, choose materials, and pull the permits the build needs.
2. Foundation & frame
Footings, foundation, and framing go in level, square, and to code.
3. Side, roof & finish
Siding, roofing, trim, doors, and windows go on, then we clean up and walk it with you.
What an addition or custom build costs.
Priced per project after we scope the build
A poolside shed and a two-story addition are very different numbers, so we price each build after seeing the site and scope. You'll get a clear, itemized estimate for free.
Size & complexity
Footprint, height, and rooflines are the biggest drivers of cost.
Foundation & site
Footings, grading, and access affect the structural work needed.
Finishes
Siding, roofing, windows, and trim choices set the final look and price.
A custom poolside shed build.
A poolside outbuilding framed from the ground up, then sided, roofed, and trimmed to match the property — built to house pool equipment and stand up to the elements.
What customers say about our work.
We had all of the exterior trim around our house replaced, and I couldn't be happier with the work Chris did. The quality and attention to detail really stood out, and it was clear from day one that he genuinely cared about doing the job right — making sure the end result was something he'd be proud of, as if it were his own house. Beyond the great craftsmanship, I truly enjoyed working with Chris along the way. He was easy to talk to, communicative throughout the project, and clearly invested in the outcome. We loved the finished product so much that we've already scheduled him for more work, and I wouldn't hesitate to recommend him to anyone looking for a contractor who truly cares about both the process and the result.
Kyle Jennings South Shore, MAI've used CB Builders many times, for many projects. They're excellent at roofing and siding. Every time, they walk me through the specific challenges of the project and offer solutions to all of them. When I bring them onto a project, I'm confident the job will be done right. Will definitely use them again.
Dominic Watkins South Shore, MAWhether you need a roofer, new siding on your house, new windows, or even a deck — no need to look any further. They are very affordable, reliable, and very informative. I give them 5 stars and would recommend them to everyone.
Brian Haddock South Shore, MA
Additions & custom builds across the South Shore.
We build additions, outbuildings, and custom structures throughout these towns and the surrounding area:
Additions & custom build questions, answered.
What kinds of additions and structures do you build?
Everything from home additions and bump-outs to standalone structures like sheds, pool houses, cabanas, and garages. If it needs framing, siding, a roof, and trim tied together properly, it's in our wheelhouse.
Do you handle design and permits?
Yes. We help plan the structure, then pull the permits the job requires and build to Massachusetts code so it passes inspection. You get a clear scope and schedule before we break ground.
Can you match an addition to my existing home?
That's the goal. We match siding, trim, roofline, and details so a new addition reads as part of the original home rather than a bolt-on, including on older and coastal houses.
Do you do the foundation and framing too?
Yes — footings, foundations, and framing are the part that keeps a structure square, dry, and standing for decades. We do that work ourselves and get it right before anything finished goes on.
How much does an addition or custom build cost?
It varies too much by size, complexity, and finishes to quote sight unseen — a poolside shed is a very different number than a two-story addition. We'll scope your project and give you a free, itemized estimate.
Ready for a free estimate?
Tell us what your home needs and we'll follow up with clear next steps, honest pricing, and a no-obligation estimate.
