When your Sammamish home no longer fits your life, a well-planned addition can give you the space you need without the cost and disruption of moving. Higgason Homes has been designing and building home additions and structural remodels across the Eastside for more than 20 years. As a licensed and bonded design-build contractor based right here in Sammamish, we manage the entire project in-house, from engineering and design through permitting and construction.
From Pine Lake and Klahanie to the Trossachs and Beaver Lake, we design additions that integrate seamlessly with your existing home — matching rooflines, finishes, and architecture so the new space looks like it was always there.
What Our Sammamish Home Addition Service Includes
- Room & Bump-Out Additions — expand kitchens, primary suites, and living areas.
- Second-Story Additions — add a full floor of living space when you cannot build out.
- Garage Conversions & ADUs — create accessory dwelling units and flexible living space.
- Structural Revisions & Repair — beams, foundations, and load-bearing changes handled by our engineers.
- Whole-Home Integration — finishes and systems matched so the addition feels original.
Explore our full additions & structural remodeling services.
Our Design-Build Process
We call it Idea to Innovation: communicate and collaborate, then create.
- Free In-Home Consultation — we meet at your Sammamish home, walk the space, and listen first.
- Design, Engineering & Planning — our designers and engineers develop a detailed, structurally sound plan tailored to your home.
- Permitting & Construction — your dedicated Project Manager handles permits, procurement, and scheduling through completion.
Why Choose Higgason Homes
- Licensed & Bonded — Washington State contractor license HIGGACL847M1.
- Design-Build Under One Roof — designers, engineers, and builders on one team, so your vision is never lost between planning and construction.
- 100% Satisfaction Guaranteed — we never call a project done until you approve the finished results.
Recent Addition Projects Near Sammamish
Serving Sammamish, WA
Higgason Homes is based in Sammamish and has served homeowners across the Eastside for over two decades. We hold all necessary licenses, insurances, and qualifications to work in Sammamish and are fully familiar with local permitting and structural requirements. See more of our service areas.
Frequently Asked Questions
How much does a home addition cost in Sammamish?
Additions generally start around $100,000 and can range to $400,000 or more depending on size, second-story work, and structural complexity. We provide a detailed estimate after your consultation.
Do you handle permitting and structural engineering?
Yes. Our team includes engineers, and your Project Manager secures all permits and coordinates inspections from start to finish.
How long does an addition take?
Timelines depend on scope and permit approval, and are specified in writing in your contract.
Is Higgason Homes licensed to work in Sammamish?
Yes — we are a fully licensed and bonded general contractor (license HIGGACL847M1).
Ready to Plan Your Sammamish Addition?
Reach out for a free in-home consultation and let us bring your vision to life. Request a free estimate.