Expand Your Home Without Moving
When your family outgrows your home, an addition is often smarter than selling. Prolific Design-Build plans and constructs room additions, second-story additions, bump-outs, and sunroom enclosures throughout King County. Our in-house design-build team means one contract, one point of contact, and no finger-pointing between architects and builders.
Types of Home Additions We Build
Room additions for bedrooms, family rooms, and home offices. Second-story additions that double your square footage on the same footprint. Kitchen bump-outs that extend your cooking and dining space. Primary suite additions with full bathroom, walk-in closet, and private entry. In-law suites and multi-generational living spaces with separate entrances and kitchenettes.
The Design-Build Advantage
Traditional projects separate design from construction, creating delays, change orders, and miscommunication. Our design-build model integrates architectural planning, engineering, permitting, and construction under one team. You get accurate budgets upfront, faster timelines, and a single accountable partner from concept to completion.
Permits and Engineering
Every addition requires structural engineering, energy code compliance, and city or county permits. We handle all of it. Our team manages the permit application, plan review process, and all required inspections so you never have to visit a permit office.
Service Area
We build home additions in Seattle, Bellevue, Kirkland, Redmond, Issaquah, Sammamish, Woodinville, Bothell, Kenmore, Mercer Island, and across King County.