Now covered in more depth
Kirkland homeowners frequently ask: what does it cost to add on to my home? Here is a realistic breakdown of home addition costs specific to the Kirkland, WA market in 2026.
Home Addition Costs in Kirkland (2026)
| Addition Type | Cost Range |
|---|---|
| Primary suite addition (400 sq ft) | $160,000 to $270,000 |
| Second story addition (full floor) | $330,000 to $580,000 |
| Kitchen addition (250 sq ft) | $110,000 to $190,000 |
| Home office addition (200 sq ft) | $85,000 to $155,000 |
| Family room addition (300 sq ft) | $120,000 to $200,000 |
| Garage conversion ADU | $90,000 to $175,000 |
Architect Fees for Kirkland Additions
- Small addition (under 400 sq ft): $16,000-$28,000
- Medium addition (400-800 sq ft): $22,000-$42,000
- Full second story: $35,000-$65,000
Planning a project?
Want a number for your addition?
Send David the address and a few lines about what you want. The first feasibility check is free and usually takes about a day: what the site and the code are likely to allow, and what to check first.
Architect since 1996, member of the AIA and NCARB. Three Masonry Excellence Awards for commercial projects; the Carr residence was featured in Above The Lake and Lux magazines.
Kirkland vs. Seattle Costs
Kirkland and Seattle costs are broadly comparable for equivalent work. What actually moves a budget between the two is the specific site, how easy it is to stage and deliver to, and which jurisdiction reviews the permit. Permit process and review time do differ measurably by city, and on a long project that is a real cost even though it never appears on a bid.
Get a Free Cost Estimate
Piper Cole Architects provides detailed cost estimates in free initial consultations. We are headquartered in Kirkland and work throughout the Eastside. Contact us, call 425-753-6452.
