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Business Details
21 Years
experience
Your Trusted Custom Home Builder in Mercer Island
Since 2005, Gallagher Co. Co. has been dedicated to crafting exceptional custom homes and transforming residential spaces across Mercer Island and neighboring communities. Our commitment to quality begins with a team of seasoned professionals who bring decades of combined experience in both commercial and residential construction. We specialize in creating tailored estates that seamlessly integrate sustainable features and modern elegance, ensuring every project aligns with our clients' unique visions and lifestyles. Our process emphasizes transparency, precision, and collaboration, from the initial consultation to the final inspection. With a portfolio that includes waterfront homes, equestrian estates, and eco-friendly properties, we pride ourselves on delivering results that exceed expectations.

Our team's expertise, combined with a focus on using premium materials and innovative design, has earned us recognition as one of the Puget Sound Business Journal's Fastest Growing Companies. We maintain long-standing relationships with clients, architects, and subcontractors through honesty, respect, and an unwavering dedication to excellence. Whether renovating a single home or managing large-scale commercial projects, we approach every task with the same level of professionalism and attention to detail that has defined our reputation for two decades.
Services
Custom Homes Remodels Outdoor Living Commercial Projects
Details
  • Year established: 2005
Highlights and features
  • We offer 35+ years of construction expertise from our founder, Tom Gallagher Co. Co..
  • Our team includes certified project managers and superintendents with industry-specific training.
  • We guarantee precision through a detailed four-step construction process with final inspections.
  • Our portfolio includes hundreds of successfully completed residential and commercial projects.
  • We maintain long-term relationships with subcontractors and clients through transparent communication.
What people say
Attention to detail Professional team Outstanding quality Seamless building process Transformative results
Services
Custom Homes
Gallagher Co. Co. specializes in building luxury custom homes tailored to clients' unique needs. Our process includes initial consultations, detailed estimates, and comprehensive construction management. We focus on integrating sustainable features and modern design while maintaining strict adherence to budgets and timelines. Our team ensures every detail meets the highest standards of craftsmanship.
Remodels
We transform existing spaces through high-end residential remodeling services. Our expertise includes kitchen and bathroom upgrades, structural modifications, and interior redesigns. Using premium materials and advanced techniques, we enhance functionality while preserving the home's character. Each project follows a structured process from planning to final inspection.
Outdoor Living
Our outdoor living solutions create functional and aesthetically pleasing spaces for residential and commercial properties. Services include patio construction, pool installations, and custom fire feature design. We focus on blending natural elements with modern amenities to maximize usability and visual appeal across various property types.
Commercial Projects
Gallagher Co. Co. delivers commercial building solutions ranging from tenant improvements to new facility construction. Our experience spans storage facilities, restaurants, and office spaces. We prioritize long-term durability while addressing both immediate functional needs and future adaptability requirements for business environments.
People
Tom Gallagher
Owner
With over 35 years in construction, Tom founded Gallagher Co. Co. in 2005 after working on commercial projects like hotels and high-rises. He leads with integrity, focusing on quality craftsmanship and client relationships.
Leanne Gallagher
Co-Founder
Leanne graduated from the University of Washington in 1988 and co-founded Gallagher Co. Co. She specializes in design management, creating the company's signature style while overseeing residential and commercial projects.
Jay Nygaard
Senior Project Manager
Jay has 22 years of construction experience, focusing on high-end residential and light commercial projects. He graduated from the University of Washington in 2003 and specializes in architect collaboration and complex project execution.
Robin Farrish
Controller
Robin brings 24 years of financial expertise in real estate development and construction. She graduated from Utah Valley University with a BS in Accounting and manages financial operations for Gallagher Co. Co.'s growing projects.
Dave Kessler
Project Executive
Dave holds a Bachelor's in Construction Management from the University of Washington. With experience in commercial construction and real estate development, he now leads commercial expansion efforts for Gallagher Co. Co.'s growing division.
Questions
What types of residential projects does Gallagher Co. Co. Co. specialize in?
We specialize in luxury custom homes, kitchen and bathroom remodels, and outdoor living space transformations. Our expertise includes waterfront properties and eco-friendly designs.
Do you handle both residential and commercial construction projects?
Yes, we offer both residential and commercial construction services. Our commercial experience includes tenant improvements, storage facilities, and restaurant build-outs.
What areas do you serve for home construction projects?
We primarily serve Mercer Island and surrounding communities, including Seattle, the Eastside, and broader Pacific Northwest region.
Can you help with design elements during home remodeling projects?
Yes, our team includes experienced designers who assist with material selection, space planning, and creating cohesive aesthetics throughout remodeling projects.
What is your construction process for new home builds?
Our process includes initial consultation, detailed estimating, comprehensive construction management, and final inspection to ensure quality standards are met throughout the building process.
How does Gallagher Co. Co. Co. ensure project timelines are maintained?
We use structured project management approaches with regular progress tracking. Our experienced team and established subcontractor relationships help maintain schedules while ensuring quality outcomes.