KOI Build Co is a custom home builder serving Olympia, Lacey, Tumwater and South Puget Sound, WA. We work with homeowners to design and construct new homes that reflect their lifestyle, budget and long-term vision, with a focus on quality materials and thoughtful layouts.

From initial concept and site evaluation through plans, permits and construction, our team manages the entire build process so you have a single, accountable partner. We coordinate with architects, engineers and trades to keep your project moving smoothly and transparently from foundation to final walkthrough.

Whether you are building on your own land or developing a new lot, KOI Build Co delivers custom homes with energy-efficient construction, modern finishes and the level of detail you expect from an experienced local builder.