Addition permits in City of Kirkland: fees, timeline & requirements (2026)

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.

In the source's own words

“A Building Permit is required prior to constructing, enlarging, altering, repairing or changing the use of a building or structure.”

Source ↗verified 2026-09-24

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

1. foundation/footing
2. plumbing rough-in
3. electrical rough-in
4. mechanical rough-in
5. framing
6. insulation
7. drywall
8. 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 — Washington baseline, not City of Kirkland's own schedule

Worked example for a $120,000 home addition project (building permit). Your actual fee scales with project valuation.

Plan-review fee scales with valuation per UBC Table 1-A. State surcharge $6.50 per building permit. Trade permits (E/P/M) separate. Apply via https://mybuildingpermit.com. We have not read City of Kirkland's adopted fee schedule, so this is not City of Kirkland's fee: it walks the standard valuation table most Washington cities adopt by reference, as a rough guide. The real numbers are in City of Kirkland's fee schedule ↗. Impact/utility fees may apply separately.