Most Kirkland homes weren't built with a home office, a primary suite, or room for aging parents in mind, and moving isn't always realistic on lots this tight. New Day Construction is a registered general contractor that designs and builds home additions across Kirkland and the greater Eastside, handling everything from a single bedroom bump-out to a full second story. We walk every homeowner through cost, permitting, and scope before a single wall comes down.
Call (425) 584-2936 or request a free consultation to talk through your Kirkland addition.
What's Included in a Home Addition
A New Day Construction home addition covers design, permitting, foundation and framing, plumbing and electrical work tied to the new space, and finish work matched to your existing home. We handle the addition as one project, not a string of subcontractors you're managing yourself, so the roofline, siding, and interior finishes read as part of the original house rather than an obvious add-on.
When Kirkland Homeowners Need an Addition
Homeowners usually call us when the current floor plan has run out of room. Common triggers: a growing family that's outgrown the bedroom count, adult children or aging parents moving back in, a home office that's currently a corner of the dining room, or a primary suite that never existed in the original build. On some lots, the slope or setback rules make building up the only option; on others, a simple ground-floor bump-out solves it without touching the roofline at all.
How New Day Construction Handles Your Addition
Here's what the process looks like from first call to final walkthrough.
- Initial consultation and site walk. We look at your existing home, lot slope, and zoning before proposing a scope.
- Design. We draw the addition to tie into your existing roofline, siding, and floor plan rather than bolting on a visibly separate box.
- Permitting. For any addition that adds living space or touches a load-bearing wall, we submit and manage permits with the City of Kirkland. A structural engineer is brought in specifically when a project changes the size or position of an opening in a load-bearing wall, not for every wall we touch.
- Construction. Our crews and licensed trade partners handle foundation, framing, plumbing, and electrical on-site, with one point of contact managing the schedule.
- Final inspection and punch list. We walk the finished addition with you, close out any punch list items, and do a full site cleanup before calling the project done.
Materials and Methods We Use
Our crews build to the 2021 Uniform Plumbing Code with Washington's amendments, in effect statewide since March 2024, and to current seismic and energy-code requirements for the region. For additions that tie into an existing roofline, we match siding and roofing materials rather than leaving a visible seam. High-quality materials cost more upfront but hold up better against the region's wet climate, which matters most on an addition's exterior envelope.
What Drives the Cost of a Home Addition in Kirkland, WA
There's no single number that fits every addition. As of September 2026, home addition costs on the Eastside, Kirkland included, typically run $180 to $450 per square foot for a mid-range, single-story addition. Second-story work runs higher, roughly $350 to $700 per square foot, because it involves reinforcing the existing structure rather than building on a new foundation.
| Factor | Why it matters |
|---|---|
| Square footage | A bedroom bump-out and a full second story aren't the same project |
| Foundation type | Building out on a new foundation costs less than building up |
| Lot slope | A sloped lot can require a stepped foundation, which adds cost |
| Plumbing and electrical | New bathrooms or kitchens in the addition add scope |
| Permit complexity | Structural changes trigger more review with the City of Kirkland |
These figures are planning-stage estimates, not a quote. Your actual number depends on a site walk.
Residential, Multi-Family, and Commercial Additions
New Day Construction takes on residential home additions, multi-family renovation work, and commercial buildouts, so the same design-build process applies whether it's a single-family addition or a larger property. Homeowners exploring an accessory dwelling unit instead of an attached addition go through the same initial consultation, since the zoning and permitting questions overlap.
Serving Kirkland and the Eastside, King County
Kirkland sits in King County, and we build additions across ZIP codes 98033, 98034, and 98083, along with Bellevue, Redmond, Bothell, Woodinville, and the wider Eastside and greater Seattle area. Our Kirkland office is at 15021 116th Pl NE, Kirkland, WA 98034, with our main design showroom in Bellevue for material selections.
Related Remodeling Services
Bathroom Remodeling · Kitchen Remodeling · ADU Builders · Custom Home Builders
