KOI Build Co designs and builds custom decks and patios for homeowners in Olympia, Lacey, Tumwater and South Puget Sound, WA. We create outdoor living spaces that extend your home, add usable square footage and make it easier to entertain, relax and enjoy the Northwest seasons.

Our team works with composite and wood decking, railings, stairs, covered structures and concrete or paver patios to match your vision and budget. We handle layout, permitting and structural details so your new deck or patio is both beautiful and built to code.

Whether you want a simple backyard deck, a multi-level entertaining space or a patio integrated with a remodel or addition, KOI Build Co delivers thoughtful design, durable materials and clean craftsmanship from start to finish.