Kirkland, WA · KGC
Kirkland Home Additions
You love your Kirkland neighborhood. You've outgrown your home. We build seamless additions — from mudrooms and master suites to full second-story expansions — that look like they were always there.
The Calculation
Adding On Costs Less Than Moving in Kirkland's Market
In Kirkland's current real estate market, moving from a 1,800 sq ft home to a 2,400 sq ft home — just 600 additional square feet — typically means spending $300,000–$500,000 more. That's before realtor fees, moving costs, and the transaction tax. Then you have to start over with a new neighborhood, new neighbors, and a house that isn't set up exactly how you like it.
A well-designed home addition adds the same 600 square feet for $150,000–$250,000, in the home you've already customized, on the street you already love, near the schools your kids already attend. The financial case is often overwhelming in favor of building instead of moving.
Beyond the numbers: the right addition doesn't just add rooms — it can fix the fundamental layout problem your home has always had. The mudroom that eliminates the pile of coats by the front door. The master suite addition that finally gives you the bathroom you've wanted. The bonus room over the garage that solves the "where do the teenagers go" problem permanently.
Second-Story Additions
The most cost-effective way to double your living space without touching your lot coverage. We add a full second story or partial story addition over your existing structure — requiring structural engineering, temporary roofing, and expert sequencing to protect your home during construction.
Ground-Floor Bump-Outs
Expanding your kitchen, living room, or master bedroom outward from the existing footprint. Subject to Kirkland's setback requirements and lot coverage limits — we review your zoning early to confirm what's possible before you fall in love with a plan that can't be permitted.
Mudroom Additions
A dedicated mudroom is arguably the highest-quality-of-life addition for a Kirkland family with kids, dogs, or an outdoor lifestyle. Custom built-ins, bench seating, cubbies, coat hooks, a utility sink, and a tile floor that can handle everything your family brings in from the PNW weather.
Master Suite Additions
Adding a private master wing to the back or side of your home — a generous bedroom, spa bathroom, walk-in closet, and potentially a private deck. Many Kirkland homeowners add a master suite over the garage, using underutilized airspace that's already within the home's footprint.
Kirkland Zoning
What Kirkland's Zoning Rules Mean for Your Addition
Setbacks
Required Buffer Zones
Kirkland's residential zones typically require 5-foot side yard setbacks and 20-foot rear yard setbacks, though these vary by zone designation (R1, R2, R4, R6). We pull your property's exact zoning information and calculate the buildable area before any design work begins.
Lot Coverage
Max % of Your Lot
Most R1 zones in Kirkland allow 35–40% maximum lot coverage for all impervious surfaces including the house footprint, garage, and covered patios. We calculate your current coverage and remaining allowance so you know exactly how large your ground-floor addition can be.
Height Limits
35 Feet Typical
Kirkland's residential zones typically cap building height at 35 feet. Second-story additions rarely exceed this, but homes on sloped lots need careful design to ensure the downhill elevation stays within the height envelope. We include this analysis in our preliminary design phase.
Architectural Matching
Your Addition Should Look Like It Was Always There
The most common mistake in home additions is treating the new structure as a separate appendage bolted to the side of the house. You can always tell — mismatched rooflines, slightly different siding texture, windows that are the wrong proportion. It looks like what it is: an afterthought.
We approach additions architecturally. That means matching or complementing your existing roofline pitch, matching siding materials exactly (or replacing the original siding to unify the exterior), replicating your home's window style and proportions, and detailing the trim to be indistinguishable from the original construction.
Matching existing materials in Kirkland homes built 20–30 years ago can be a challenge. Cedar siding weathers to a specific color. Brick has a particular texture. Roof tile styles go discontinued. We source matching materials through specialty suppliers and have the installation expertise to make the transition invisible.
Interior transitions matter equally. The floor level must match, door heights need to be consistent, and the ceiling detail at the junction between old and new needs to read as intentional design rather than a seam. These are the details that separate a KGC addition from work that looks like a low-budget flip.
FAQ
Home Addition Questions
How long does a home addition take in Kirkland?
A typical ground-floor addition (500–800 sq ft) takes 3–5 months from breaking ground to final inspection. Second-story additions typically run 4–6 months due to more complex structural requirements. The permitting phase with Kirkland's building department adds 6–10 weeks before construction begins.
Can we live in our home during a home addition?
In most cases, yes. Ground-floor additions that connect to the home via a single opening can be built while the rest of the house stays livable. Second-story additions are more disruptive since the roof is temporarily removed. We assess each project individually and give you an honest picture of the living conditions during construction before you commit.
What's the cost of a home addition in Kirkland?
Ground-floor additions in Kirkland typically run $250–$400 per square foot for a complete turnkey result including all permits, foundation, framing, roofing, exterior finish, and interior finish. Second-story additions run slightly higher at $300–$450 per square foot due to structural complexity. A 500 sq ft master suite addition typically costs $130,000–$200,000.
Do I need an architect for a home addition?
Kirkland requires stamped architectural and engineering drawings for most home additions. We work with licensed architects and structural engineers as part of our project team. For smaller additions (under 200 sq ft), our in-house designers may be sufficient — we assess this during your initial consultation and include all design costs in our proposal.
Get Started
Build the Space You Need, Keep the Home You Love
We'll review your property's zoning, assess what's possible, and design an addition that solves your space problem while enhancing your home's value and curb appeal.
(425) 555-0198