Quality. Craft. Integrity.

Greater Seattle Custom Home Builder

For over 20 years, Gallagher Co. has delivered custom homes, remodels, and commercial projects in Mercer Island and throughout the Puget Sound region. Quality built to last generations.

300+

Projects Completed

Luxe Gold List

Recognized homebuilder

Fastest Growing

Puget Sound Business Journal

Built by People Who Care About the Details

There are builders who create beautiful homes. Then there are builders who also obsess over the details: the waterproofing beneath the deck, the steel connections hidden inside the walls. We are the second kind.

Gallagher Co. is a custom home building firm founded by Tom and Leanne Gallagher in 2005 and rooted in Mercer Island, WA. We handle new construction, remodels, and commercial projects for clients who see their builder as a partner, not just another line item.

What We Build

Custom Homes

From the ground up, for clients building their forever home. From waterfront lots on Mercer Island to hillside properties across the Eastside, every project is built around your vision, your site, and your timeline.

Remodels

Renovations that respect what your home already is while transforming it into what you need it to be. We bring the same passion and expertise to give you the upgrade you have always wanted.

Commercial

Office buildouts, tenant improvements, and ground-up commercial construction. The same quality and communication our residential clients expect, applied to larger commercial spaces.

West Facing Modern

Our Work Speaks for Itself

Every project has a story: the architects we collaborated with, the challenges we solved on site, the details that make the finished home something the owners love to call their own. Browse our portfolio to see more of what we do.

Commercial

Maltby Tilt-up Warehouse

Waterfront

Historic Laurelhurst Restoration

Waterfront

Waters Edge Stuart Silk Design

As Featured In

LUXE

Featured in Luxe Interiors + Design for the restoration of a Seattle Dutch Colonial that blends historic character with modern living.

Architectural Digest

Recognized by Architectural Digest for a Scandinavian-inspired Woodinville estate defined by craftsmanship and thoughtful design.

RUE

Featured in RUE Magazine for a custom Woodinville estate that seamlessly connects architecture, interiors, and landscape.

The People Behind the Build

A home is only as good as the crew that builds it. Our team includes experienced superintendents, skilled carpenters, and tradespeople who take personal ownership of every detail.

Ready to Explore the Possibilities?

A home is only as good as the crew that builds it. Our team includes experienced superintendents, skilled carpenters, and tradespeople who take personal ownership of every detail.