New home construction
Ground-up custom homes from raw land or a teardown and rebuild, managed from site work to final walkthrough.
Explore new constructionHome additions
Home additions built for Cape Cod
Primary suites, family rooms, in-law suites, garages with living space above, second stories, and sunrooms—additions planned around your existing home, your lot, and the way your family actually lives.
Established 1983
Family owned
Owner on site
Licensed & insured
More room, same address
Add on to the home you already love
An addition done well solves the space problem without giving up the neighborhood, the yard, or the years you have put into your home. Done poorly, it looks bolted on and fights the original house at every seam.
DC Builders has built additions on Cape Cod for more than 40 years. Owner Dave Cleary stays involved from the first conversation through the final walkthrough, so tying new construction into an existing home—structurally and visually—gets the attention it deserves. Not sure whether to add on or move? Read our guide.
- Planning that starts with your existing home, lot, and budget
- Coordination with architects, engineers, and trusted trades
- Careful tie-in to existing structure, rooflines, and systems
- A home that stays livable while the work happens
Related services
One builder for the whole project
Additions rarely happen in isolation. Whether the project grows to include a kitchen, a deck, or a full rebuild, the job is managed as one connected construction process.
All construction services
Custom homes, additions, remodeling, and exterior work handled by one accountable local builder.
See all servicesKitchen remodeling
Functional, well-built kitchens with coordinated cabinetry, surfaces, fixtures, lighting, and finish work.
Explore kitchen remodelingBathroom remodeling
Bathrooms rebuilt for daily use—tile, fixtures, ventilation, and finishes selected for coastal conditions.
Explore bathroom remodelingDecks & porches
Outdoor living built to stand up to salt air and Cape Cod weather, matched to the house it serves.
Explore deck buildingZero-energy custom homes
High-performance building envelopes and systems for homes designed to produce as much energy as they use.
Explore zero-energy homesWays to add space
Addition types we build
Every addition starts with the same questions: what the family needs, what the lot allows, and how new space can connect naturally to the existing house. These are the projects we build most often across Cape Cod, Martha's Vineyard, and Nantucket.
- Primary suites
- Family rooms
- In-law suites
- Garages with living space above
- Second stories
- Sunrooms
- Bump-outs
- Connected breezeways
Cape Cod permitting
Details that deserve early attention
Additions on the Cape often trigger zoning setback review, conservation review near wetlands, and septic/Title 5 capacity checks. None of these has to derail a project—but each one takes time, and finding out late is what breaks schedules.
DC Builders puts these questions on the table at the first conversation, so the design, the approvals, and the construction schedule are built around what your property actually allows.
Read our addition planning guideHow the work moves forward
A clear path from idea to final walkthrough
Consult
Walk the house and lot, discuss the space you need, and talk honestly about priorities, budget, and timing.
Design & permits
Coordinate drawings, structural review, selections, and the zoning, conservation, and septic approvals the project needs.
Build
Tie the new structure into the existing home—foundation, framing, roofline, and systems—while keeping the house livable and the site organized.
Complete
Finish inspections, blend interior and exterior finishes with the original house, and walk through every detail together.
“Owner Dave Cleary is on every job site—from the first sketch to the final nail.”
DC Builders’ approach to project oversightHome addition questions
Before you start
Can we live in the house during construction?
Usually, yes. Most addition projects are planned so the family stays in the home, with dust protection, sealed work zones, and access routes worked out before construction starts. If a phase will be especially disruptive, you will know well in advance.
How long does a home addition take?
It varies with the scope of the project. Design work and permitting add time before construction begins, and the build itself depends on the size and complexity of the addition. A consultation is the best way to get a realistic picture for your specific project.
Do you handle the permits?
Yes. Building permits and any related local approvals are coordinated as part of the project, so the paperwork moves in step with the design and construction schedule.
Will the addition match our existing house?
Yes. Matching rooflines, siding, trim, and proportions so the addition reads as part of the original home is core to the craft. The goal is an addition that looks like it has always been there.
How do I get started?
Call (508) 388-5120 or use the consultation request form. Bring any plans, photos, priorities, and timing information you already have.
Start the conversation
Planning a home addition?
Tell us about your home, your lot, and the space your family needs.