four generations of trusted craftsmanship

Custom Homes & Remodels

reimagine your space
elevate your Bathroom Style and Function

create a spa-like retreat

Unwind in the comfort of a meticulously crafted bathroom
modern living a phone call away

luxury living spaces

Transforming Homes Across the Seattle Eastside
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your TRUSTED

home contractor

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.

Why Choose?

Thornberg Construction

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Experience and Expertise

We have honed our craft over four generations, ensuring each project benefits from decades of hands-on knowledge.

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Quality Craftsmanship

Rooted in the Seattle Eastside community for decades, we uphold the highest standards in every project.

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Personalized Service

Our family has lived and built in this region for years, and we know how to partner with our clients.

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Transparent Communication

We keep you informed at every step with clear and prompt communication.

INDUSTRY ASSOCIATIONS

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.

Official logo of the National Association of Home Builders.Official logo of the National Association of Home Builders.
NATIONAL ASSOCIATION
OF HOME BUILDERS
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master builders
ASSOCIATION
Official logo of the Building Industry Association of Washington.Official logo of the Building Industry Association of Washington.
Building Industry
Association of Washington
MAXIMIZE

YOUR Investment

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.

trust
value
professionalism

read What clients say about us

Quality, communication, professionalism, collaboration, cost, and schedule - Thornberg delivered on it all for us during our remodel (upper story addition, new kitchen, bathroom, flooring, entryway) - going with them was perhaps the best decision we made throughout the project; absolutely zero regrets and a ton of relief.

Sean, Remodel Homeowner
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read What clients say about us

Thanks again to you and your team for making my kitchen beyond breath taking.

Danielle, Renovation Homeowner
Image of a stunning kitchen built by Thornberg Construction.

read What clients say about us

I wanted to thank all members of the Thornberg team for the high level of skill, attention to detail, and professionalism.

Deborah, Renovation Homeowner
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read What clients say about us

Thornberg has reroofed my garage after their inspection found severe water damage in the attic. Mitchell’s professionalism put my mind at ease as he walked through all the areas of repair and helped identify the cause, which resulted in a successful insurance claim.

Brian, Insurance Claim Homeowner
Photo of roof repaired by Thornberg Construction.
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ready to Reimagine Your Space?

Let’s start planning your dream project today