The 10 home addition contractors from Google's results for Seattle, Washington, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
Licensing in Washington. Washington contractors must register with Labor & Industries (L&I), which also shows their bond and insurance.
on GoogleSeattle, WA
Level Up Construction & Remodeling handles residential remodels, home additions and new builds in Seattle, Bellevue and surrounding areas. The team manages each project from early planning through completion, whether the homeowner arrives with a clear plan or is still exploring ideas.
(425) 657-6838 600 Stewart St Ste 400, Seattle, WA 98101
on GoogleSeattle, WA
In Seattle, Harjo Construction builds home additions and ADUs and remodels kitchens and basements. The company also offers design services and builds custom cabinets, and has worked on extra stories and enlarged kitchens.
(206) 909-6312 4900 15th Ave NW, Seattle, WA 98107
on GoogleEverett, WA
Alta Seattle is a home addition contractor based in Everett, Washington.
(206) 773-7361 500 SE Everett Mall Way Unit 205B, Everett, WA 98208
on GoogleSeattle, WA
Seattle ADU Inc is a design-build contractor that designs, permits and builds DADUs, backyard cottages and garage conversions around Puget Sound. It also takes on other residential construction, including home additions and bathroom remodels.
(425) 699-6096 509 Olive Wy, Seattle, WA 98101
on GoogleKirkland, WA
McAdams Remodeling & Design is a Kirkland design-build firm adding space to Eastside homes. Projects include second-story additions, primary suite additions, garage additions and whole-house remodels that rework how an existing home functions.
(425) 822-6555 13003 NE 85th St, Kirkland, WA 98033
on GoogleSeattle, WA
Better Builders is a Seattle design-build firm working on bathroom remodels and home additions.
(206) 588-2075 5606 California Ave SW, Seattle, WA 98136
on GooglePortland, OR
Hammer & Hand builds custom homes, remodels existing houses and handles commercial construction in Portland. The firm also builds passive houses and runs its own woodshop for custom cabinetry and woodworking, and it takes on additions, ADUs and design-build projects.
(503) 232-2447 1011 SE Lincoln St, Portland, OR 97214
Seattle
Better Builders is a Seattle design-build company that plans and builds home additions. Its projects help households make room for aging parents, growing families or more living space, weighing whether to build up or out.
Seattle
Maksymov Brownstone LLC remodels kitchens across the Greater Seattle area, from new layouts and custom cabinetry to full renovations. Its own crew does the work rather than subcontractors, and home additions are also part of what the company builds.
In Seattle, a bump-out typically costs $28,000 – $68,000. Remodeling labor in Seattle runs about 13% above the US median, which accounts for most of the difference from the same project elsewhere.
These are the firms from Google's results for "home additions seattle", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
Usually yes, or a design-build firm with in-house design. Additions need stamped structural drawings for the permit in most places, and zoning review on setbacks, height and lot coverage.