Gallagher Co., LLC

Gallagher Co., LLC Specializing in custom homes and large remodels, Gallagher Co. is located on Mercer Island and owned/managed by Mercer Island residents.

Gallagher Co strives to be the home builder of choice in Mercer Island and the West Bellevue area. With over 30 years of combined construction experience, our team of custom builders are focused on paying attention to the smallest of details, imparting unprecedented value in every project we touch. We pride ourselves on impeccable quality from preconstruction through project closeout. We are commi

tted to having your experience be a smooth and easy process and your satisfaction is paramount to us.

08/24/2026

The Wellness Retreat is loading… ✨ So many exciting details are coming together, and we can’t wait to see this space fully come to life. Stay tuned! ALSO PSA! Our new website is live! Check it out! We are so excited about it and we hope you love it as much as we do

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Silk | Cavassa | Marchetti
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The Equestrian Estate is officially for sale! ✨We’re incredibly honored to have been a part of bringing this beautiful h...
08/13/2026

The Equestrian Estate is officially for sale! ✨

We’re incredibly honored to have been a part of bringing this beautiful home to life and so excited to see it featured on KING 5 Evening. It was such a special project with a wonderful client, and we’re grateful to have played a role in creating this one-of-a-kind property.

We’re excited for our clients as they begin their next chapter and for the future owners who will get to call this incredible estate home. 🤍

Watch the KING 5 feature here:
https://www.king5.com/video/entertainment/television/programs/evening/equestrian-dream-home-lists-for-139-million-in-woodinville/281-07882d67-217f-4d02-8c08-db2b759adfcf

You can also head to our story and tap the link to watch the full feature!

A little bathroom inspiration ✨Custom details, timeless materials, and thoughtful design come together to create spaces ...
08/07/2026

A little bathroom inspiration ✨

Custom details, timeless materials, and thoughtful design come together to create spaces that feel just as beautiful as they are functional. Magnolia Home is full of stunning bathroom inspiration that proves the smallest spaces can make the biggest statement.
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Designer: Janof Architecture
Photography: Miranda Estes Photography
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Dreamy penthouse condo remodel ✨•••Interior Designer: Colleen Knowles Photography: Miranda Estes Photography ••• ...
08/04/2026

Dreamy penthouse condo remodel ✨
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Interior Designer: Colleen Knowles
Photography: Miranda Estes Photography
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Behind every project is an incredible team that makes it all happen.At Gallagher Co., nothing would be possible without ...
07/30/2026

Behind every project is an incredible team that makes it all happen.

At Gallagher Co., nothing would be possible without the hardworking people in the field. Through rain, heat, cold, and long days, they continue to show up, work hard, and take pride in what they build. Their dedication, craftsmanship, and commitment are the foundation of every project we complete.

We’re grateful to have the best team. Thank you for everything you do.

Address

3010 77th Avenue SE Suite 202
Mercer Island, WA
98040

Opening Hours

Monday 7am - 5pm
Tuesday 7am - 5pm
Wednesday 7am - 5pm
Thursday 7am - 5pm
Friday 7am - 5pm

Telephone

(206) 232-1600

Website

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