Home Additions

More room.
Same address.

Primary suites, second floors, bump-outs, in-law units. We've handled additions across the East Bay, San Francisco, the Peninsula, and Marin — design, structural, permits, and build, all in-house.

Bay Area home addition by Mars Construction
What we handle

Design through final inspection.

Adding to an existing home is a different problem from building new. Foundations, framing, and utilities have to integrate with what's already there — and the addition has to look like it belongs.

We work with local architects who understand the codes and setbacks in your city. Walnut Creek isn't San Francisco, and San Francisco isn't Palo Alto. Permitting rules, property-line setbacks, and structural review change at every jurisdiction — and we navigate them daily.

What we do for additions: primary suite additions, second-floor builds, kitchen + family room bump-outs, garage conversions to JADUs, in-law units, and full-home renovations that double square footage.

Recent Additions

Built across the Bay Area.

Primary suite + bath in Palo Alto
Palo Alto
Primary suite + bath
Second-floor addition in Walnut Creek
Walnut Creek
Second-floor addition
Bedroom + bath expansion in Tiburon
Tiburon
Bedroom + bath expansion
Bump-out + family room in Concord
Concord
Bump-out + family room
Garage conversion to office in Martinez
Martinez
Garage conversion to office

Have an addition in mind?

We'll come walk the project, talk scope and budget, and tell you what's feasible — no commitment.

Request a Consultation