How Kirkland Handles Accessory Structures: A Practical Guide

Kirkland maintains 115 local ordinances across all categories, and 5 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Kirkland falls on the strict-to-permissive spectrum compared to other cities.

Carport Rules

Carports in Kirkland are accessory structures requiring a building permit when exceeding 200 square feet under WA IRC R105.2; zoning setbacks, impervious surface limits, and shoreline rules apply regardless of size.

Key details: Permit: Typically required over 200 sq ft. Setback: 5 ft sides/rear typical. Front Yard: Usually prohibited. Lot Coverage: Counts toward limit. Stormwater: May need mitigation.

Unpermitted carport construction subject to stop-work orders, fines, and forced removal; zoning violations for setback or front-yard placement; stormwater violations.

Tiny Homes

Tiny homes on foundations are allowed in Kirkland as DADUs under KZC Chapter 115 subject to IRC Appendix Q size minimums; tiny homes on wheels are treated as RVs and cannot be used as permanent dwellings.

Key details: On Foundation: Allowed as DADU. On Wheels: Not a permanent dwelling. Code Standard: IRC Appendix Q. Max Size DADU: Up to 1,000 sq ft. Utilities: City sewer + water required.

Occupying a tiny home on wheels as a permanent dwelling violates zoning and is subject to stop-occupancy orders; unpermitted construction triggers building-code enforcement.

Garage Conversions

Converting a Kirkland garage to living space needs a building permit and IRC habitable-space standards; replacement parking may apply unless transit-proximity waivers under WA HB 1337 exempt the unit.

Key details: Permit: Required. Code: IRC habitable standards. Parking: May need replacement. ADU Rules: Apply if separate unit. Energy Code: WSEC compliance.

Building code violations resulting in stop-work, correction orders, and civil fines; zoning violations if parking or ADU rules not met; occupancy cannot be legal without final inspection.

ADU Rules

Kirkland allows one attached ADU and one detached DADU on most single-family lots under KZC Chapter 115, aligned with WA HB 1337 requirements; owner occupancy is not required and many parking minimums have been removed.

Key details: Allowed Units: 1 AADU + 1 DADU. Max Size: ~1,000 sq ft or 50 percent. Owner Occ: Not required. Parking: Waived near transit. Law: WA HB 1337 + KZC 115.

Unpermitted ADU construction is a zoning violation subject to stop-work orders, fines, and potential removal; unregistered short-term use of ADUs may also face licensing violations.

Kirkland is more permissive than most cities when it comes to adu rules. That said, there are still limits.

Shed Rules

Kirkland sheds under 200 square feet typically do not need a building permit under WA IRC R105.2, though zoning setbacks, critical area rules, and electrical permits still apply.

Key details: Permit Exempt: Under 200 sq ft. Max Height: ~15 feet. Setback: 5 ft sides/rear typical. Electrical: State L and I permit needed. Code: IRC R105.2 via KMC 21.

Zoning violation if setback or coverage limits exceeded; unpermitted electrical work subject to state L and I penalties; stop-work orders for prohibited critical area placement.

Kirkland is more permissive than most cities when it comes to shed rules. That said, there are still limits.

The Bottom Line

Compared to many U.S. cities, Kirkland gives residents more room on accessory structures. 2 of the 5 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

This guide is based on Kirkland's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.