Home Additions on Cape Cod
Additions.
FB Construction designs and builds home additions on Cape Cod, with more than 640 completed: primary suites, second stories, sunrooms, garages and accessory dwelling units. We match the roof lines, trim and siding of your existing house, handle the permits, and keep the family living at home through most of the work.
640+ additions completed · Cape Cod
What every additions project includes.
Written into the estimate and the same whether you are in Mashpee or a nearby town.
- Structural review of the existing house
- Roof tie-in, siding and trim matched to the original
- Permits and conservation commission filings
- Dust walls and a protected path through the house
How it runs
Additions, step by step.
Site walk
We look at the house, the attic and the foundation, and ask how you want to live in the new space.
Design and estimate
Drawings, engineering when needed, and a written, itemized estimate.
Permits
We file the building permit and any conservation commission or historic district review.
Build and tie in
Foundation, frame, roof tie-in and dry-in first, so the existing house is open for as few days as possible.
Finish and hand-off
Finishes, final inspection and a punch list walk-through.
From our job sites
Additions in progress and finished.
-
Additions and renovations · 2025Front addition framed on a shingle Cape -
Additions and renovations · 2026Front porch addition framed in the snow -
Additions and renovations · 2025New wing framed onto a cedar shingle home -
Additions and renovations · 2023Second-floor dormer addition over a three-car garage -
Additions and renovations · 2023Crew building a roof addition from a lift -
Additions and renovations · 2022Aerial view of a second-floor addition framed on an existing house
FAQ
Additions questions.
Can we live in the house during an addition?
In most additions, yes. We build the new space first and open the wall to the existing house near the end, behind dust walls.
Do additions near wetlands need extra approval?
Work within 100 feet of a wetland usually needs a filing with the town conservation commission. We check this at the site walk and include the timeline in your schedule.
Should we build up or build out?
A second story saves lot coverage and septic capacity, but needs engineering, a temporary roof and a new stair. When the lot allows both, we walk you through each option.
From the journal
Addition or New Build? How Cape Cod Homeowners Decide
When an addition makes more sense than a new house on Cape Cod, and when it does not: lot coverage, septic capacity, structure and budget.
Planning an addition?
Site walks in Mashpee, Osterville, Hyannis and nearby towns.