Addition permits in City of Kirkland: fees, timeline & requirements (2026)
Everything you need to know about pulling a home addition permit in City of Kirkland, Washington — when one is required, what it costs, how long review takes, what documents are required, and which inspections you can expect. Cited to Apply via MyBuildingPermit.com..
When does a home addition need a permit in City of Kirkland?
A building permit is required to construct, enlarge, alter, repair, or change the use of a building. Whole-house ventilation compliance is required for new construction and additions greater than 500 square feet of heated space.
From City of Kirkland's own page
“A Building Permit is required prior to constructing, enlarging, altering, repairing or changing the use of a building or structure.”Source ↗verified 2026-05-29
Required submittals
- site plan with north arrow, property lines, setbacks, existing + proposed structures, lot coverage calculation
- floor plan existing and proposed (dimensioned, 1/4" = 1' min)
- elevations all affected sides (existing + proposed, height-to-grade)
- foundation plan + footing details (if footprint addition)
- framing plan (floor + roof + lateral)
- wall section with insulation values per WSEC
- structural calculations (when ≥500 sqft addition or out of IRC prescriptive envelope)
- WSEC compliance form (Energy Code Compliance Certificate)
- Manual J HVAC sizing calculation for new conditioned area
- window/door schedule with NFRC U-factor and SHGC values
- soils report if footing on slope or expansive soils
Inspection sequence
- foundation/footing
- plumbing rough-in
- electrical rough-in
- mechanical rough-in
- framing
- insulation
- drywall
- final
Contractor specialties needed
general, electrical-01-or-02, plumbing, mechanical
Notes & caveats
2021 IRC R301 governs framing. WSEC R402.1 sets envelope requirements. New conditioned space requires Manual J HVAC sizing. Lateral load path continuity required for vertical additions. Most WA cities use a uniform fee bracket (UBC Table 1-A) for the building permit; plan review fee is typically 65% of building permit fee.
Addition permit fee estimate in City of Kirkland
Worked example for a $120,000 home addition project (building permit). Your actual fee scales with project valuation.
| Building permit fee | $1,105.75 |
| Plan review | $718.74 |
| WA state surcharge | $4.5 |
| Estimated total | $1,828.99 |
Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $4.50 per building permit. Trade permits (E/P/M) separate. Apply via https://mybuildingpermit.com. Computed from the City of Kirkland fee bracket schedule · source ↗. Impact/utility fees may apply separately.
How to apply
- 1. Confirm your parcel's zoning & overlays. Run an address lookup for your City of Kirkland home addition — we'll pull your specific lot polygon, zoning, setbacks, and any shoreline/ECA/historic overlays.
- 2. Assemble submittals (11).
- 3. Submit through the city portal: Apply via MyBuildingPermit.com. ↗
- 4. Track review (typical: 30–120 days). Respond to reviewer comments promptly.
- 5. Pay issuance fees (Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $4.50 per building permit. Trade permits (E/P/M) separate. Apply via https://mybuildingpermit.com.) and pick up the permit. Inspection card travels with the job.
Addition permits in City of Kirkland — FAQ
When does a home addition need a permit in City of Kirkland?
A building permit is required to construct, enlarge, alter, repair, or change the use of a building. Whole-house ventilation compliance is required for new construction and additions greater than 500 square feet of heated space.
How much does a home addition permit cost in City of Kirkland?
For a $120,000 home addition project, the estimated City of Kirkland permit fee is about $1,828.99 — building fee $1,105.75 + plan review $718.74 + surcharges. Fees scale with project valuation per the city schedule.
How long does City of Kirkland take to review a home addition permit?
Typical review window: 30–120 days.