At Thornberg Construction, we don't just build – we forge legacies in the Greater Seattle Eastside. As the premier custom home builder and residential contractor, carving our mark in Issaquah, we understand the grit and graft it takes to transform a house into a home. Serving homeowners in Issaquah, Sammamish, Bellevue, and beyond, our family-owned business has been entrenched in Seattle’s Eastside for decades – your project is in good hands.
We specialize in custom home design and build, whole house remodels, and renovations that respect the sweat equity you've already invested. From kitchen remodels in Kirkland to whole house renovations in Juanita, we deliver spaces that are as functional as they are beautiful. Need an ADU (Accessory Dwelling Unit) or mother-in-law suite? We’re the design-build contractor who knows how to navigate the red tape and deliver a space that feels like an integral part of your property.
If you're scouting for the best custom home builder in Snoqualmie or contemplating the cost to build an ADU in Sammamish, know this: we don't cut corners. Whether it’s a modern kitchen remodel with an island in Kirkland or a luxury bathroom renovation with spa features in Bellevue, we bring a level of craftsmanship that’s earned through generations of experience.
We combine decades of hands-on expertise with your personal style to design and build a home that fits your lifestyle. Let us bring your vision to life with the same time-tested methods that have guided us for four generations in the Seattle Eastside.
Revitalize your space with our expert remodel and renovation services. From kitchen remodels to bathroom renovations, we offer thoughtful design and expert craftsmanship—always delivered with an unwavering commitment to your satisfaction.
Need more space? Our home additions respect your existing architecture and integrate seamlessly with your current layout. Whether planning an Accessory Dwelling Unit (ADU), adding a second story, patio, or deck, we’ll handle every detail with care and craftsmanship.
We have honed our craft over four generations, ensuring each project benefits from decades of hands-on knowledge.
Rooted in the Seattle Eastside community for decades, we uphold the highest standards in every project.
Our family has lived and built in this region for years, and we know how to partner with our clients.
We keep you informed at every step with clear and prompt communication.
Membership in these associations ensure we stay up-to-date with best practices, maintain ethical standards, and remain deeply connected to the local construction community.
With our proven track record across Issaquah, Bellevue and beyond, we’ve helped countless homeowners enjoy immediate comfort and long-term returns on their remodels. Our four generations of building knowledge ensure each addition is both functional and beautiful.
