Tillit Design + Build

Design + Build · Pacific Northwest

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It's never about the house — it's about the people who live in it.

People, not floor plans

Before we draw a single wall, we want to understand exactly who our clients are: their identity, their lifestyle, their life stage. We design and build the house around that, not the other way around — because you deserve a builder you can trust.

Who we build for

A women-owned, licensed general contractor in Bellevue, Washington, specializing in multi-generational living — additions, ADUs, in-law suites, and remodels for families with aging parents moving in, not moving out. Our founders each lived this exact problem before building the company to solve it.

Specialists in complex work

We specialize in additions and heavy remodels with complex structural changes. Open up old walls and there are always surprises waiting — so we only work with trades who are true specialists in their craft and who sync closely with ours to deliver the result our clients envisioned. The best remodel is one you can't spot — new work that blends so seamlessly with the existing home, it looks like it was always there.

Design and build, together

Design and build aren't separate phases here — the same team that maps your full project scope stays with you through construction. That's an accurate budget from the start, no handoff, and changes handled transparently rather than letting the number quietly grow.

Remodels · Additions · ADUs

T
Licensed General Contractor
Women-Owned · Fully Licensed & Insured · Lic# TILLIDB755QD

We Build In Our Community

We take the best client experiences and make them an integral part of our process. Our definition of success is a family that loves their finished home — and trusted us every step of the way to get there.

“

When issues came up, the team brought us the problem plus possible solutions with costs laid out, so all we had to do was make the final call. We’re finally living in our own home again — and it actually works for us now.

The Gathering House
Clyde Hill, WA
“

The final budget was what I expected. I was surprised it wasn’t more and that the final payment was right around the projected amount. My daughter and 3 grandchildren lived with us for nearly 3 months — they had plenty of space they could call their own.

Carol W. · The Homecoming House
Education Hill, Redmond
“

One of the things we’ve appreciated most is the clear communication and transparency. Being able to talk openly about pricing, progress, and unexpected issues makes a big difference. We’d recommend them to anyone looking for a contractor who communicates clearly and takes the time to listen.

Tesi Z. · The First Chapter House
Eastgate, Bellevue
Team collaborating on a plan

Any builder can add square footage. Exceptional builders understand the family behind the ask — and create a process where clients make the right decisions and enjoy getting there.

Meet the Founders →

Looking for inspiration? See how we've reworked homes across the Pacific Northwest to fit real, changing families.

View Projects →

"You'll never wonder where your project stands — what it costs, what's next, or what needs your attention."

— The Tillit Promise

Let's Get to Work

Tell us about your home and the family who lives in it. We'll walk you through what's possible, what it takes, and what it costs — and get back to you within two business days.

Start Your Project