How Kent Handles Accessory Structures: A Practical Guide
Kent maintains 125 local ordinances across all categories, and 9 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Kent falls on the strict-to-permissive spectrum compared to other cities.
Tiny Homes
Kent allows foundation tiny homes as permanent dwellings under the WA Building Code and as ADUs under HB 1337. Tiny homes on wheels are RVs and cannot be permanent residences outside licensed parks.
Key details: Foundation tiny home: Allowed under IRC Appendix Q. Tiny home on wheels: RV, not permanent residence. As an ADU: Allowed within HB 1337 limits. Permits: Full building, plumbing, electrical. Floodplain: Elevation and flood design required.
Contact your local code enforcement office for specific penalty information.
Carport Rules
Kent allows residential carports as accessory structures under Title 15 and Title 14. Most need a building permit, must meet setbacks, and cannot be enclosed into a garage without new permits.
Key details: Permit threshold: Most carports require permit. Setback: 5 feet side and rear typical. Snow load: About 20 to 25 psf. Enclosure: Three sides turns it into a garage. HOA overlay: May restrict design or material.
Contact your local code enforcement office for specific penalty information.
ADU Impact Fees
Kent waives Park and Transportation Impact Fees for the first ADU on a single-family lot and reduces them by 50 percent for the second ADU under KCC 15.08.250, consistent with Washington's RCW 36.70A.696 cap. Applicants still pay building, plan-review, and trade permit fees, plus utility connection charges only if a new service line is required.
Key details: State Cap: 50% of SFR (RCW 36.70A.696). Park/Transportation 1st ADU: Waived. Park/Transportation 2nd ADU: 50% of SFR. School Impact Fee: Kent SD rate applies. Electrical Permit: WA L&I (not city).
Failure to pay required permit and connection fees blocks permit issuance and inspection scheduling. Construction without paid permits triggers civil penalties under KCC Title 1.04, double permit fees on retroactive legalization, and possible utility service refusal until charges are paid.
Kent is more permissive than most cities when it comes to adu impact fees. That said, there are still limits.
ADU Owner Occupancy
Kent does not require owner-occupancy on properties with an accessory dwelling unit. The June 2023 update to KCC 15.08.250 removed the prior owner-occupancy mandate, and Washington HB 1337 (RCW 36.70A.683) prohibits Growth Management Act cities from imposing owner-occupancy on ADUs. Owners may rent both the primary dwelling and the ADU to separate tenants.
Key details: Owner-Occupancy: Not required. Removed By: KCC 15.08.250 update (June 2023). State Preemption: RCW 36.70A.683. Both Units Rentable: Yes. HOA Rules: May still apply privately.
There is no owner-occupancy violation under Kent code as of the June 2023 KCC 15.08.250 update. Private HOA enforcement is a civil matter, not a city enforcement issue. If a city official claims an owner-occupancy violation, the property owner can point to the amended KCC 15.08.250 and RCW 36.70A.683, which preempts any such requirement.
Kent is more permissive than most cities when it comes to adu owner occupancy. That said, there are still limits.
ADU Permits
Kent permits accessory dwelling units under KCC 15.08.250, updated June 2023 to implement Washington HB 1337 (RCW 36.70A.681). Up to two ADUs are allowed per single-family lot, each up to 1,000 square feet and 24 feet tall. Building permits are filed through the Kent Permit Center using the regional MyBuildingPermit.com portal.
Key details: Code Section: KCC 15.08.250. ADUs Per Lot: Up to 2 (per HB 1337). Max Size Each: 1,000 sq ft. Max Height: 24 feet. State Law: RCW 36.70A.681.
Building an ADU without a permit is a violation of KCC Title 15 and the adopted building code. Civil penalties are assessed under KCC Title 1.04 (Code Enforcement) and can include stop-work orders, daily fines, double permit fees on retroactive legalization, and refusal of final occupancy. Occupying an ADU without final inspection sign-off is a separate violation.
ADU Rental Restrictions
Kent allows long-term rental of ADUs without restriction. Short-term rentals (under 30 days) must comply with Washington's statewide short-term rental act (RCW 64.37), including the $1 million liability insurance requirement, and operators must register for Kent business and utility taxes. Both the primary dwelling and the ADU may be rented under long-term leases simultaneously.
Key details: Long-Term Rental: Unrestricted. Short-Term Rental Law: RCW 64.37. STR Insurance: $1M minimum. Rent Control: Preempted (RCW 35.21.830). Landlord-Tenant: RCW 59.18.
Operating an STR without RCW 64.37 insurance and posted safety information is a state-law violation enforceable through civil penalties and platform delisting. Failure to register for Kent B&O tax exposes the operator to back-tax assessment plus penalties and interest by the Kent Finance Department and the Washington Department of Revenue. Long-term rental disputes are handled under RCW 59.18 in King County District Court. Renting an ADU that lacks a final occupancy sign-off is a separate KCC Title 1.04 violation.
Garage Conversions
Kent garage conversions need building permits and must meet habitable-space standards for egress, insulation, heat, and alarms. Converting to an ADU is allowed under HB 1337 with zoning review.
Key details: Permits required: Building, plumbing, mechanical, electrical. Egress: Window in any sleeping room. Heat and alarms: Permanent heat, hardwired alarms. ADU path: Kitchen triggers ADU review. Floodplain: Flood-resistant standards.
Contact your local code enforcement office for specific penalty information.
Shed Rules
Kent allows residential sheds without a building permit when 200 square feet or less, under 12 feet tall, and not used for habitation. Larger sheds or any shed with utilities need a permit and must meet zoning setbacks.
Key details: Permit threshold: Over 200 square feet. Setback: Typically 5 feet side and rear. Height: About 12 to 15 feet max. Utilities: Always need trade permits. Habitation: Only as permitted ADU.
Contact your local code enforcement office for specific penalty information.
Kent is more permissive than most cities when it comes to shed rules. That said, there are still limits.
ADU Rules
Kent allows accessory dwelling units on single-family lots under Title 15 and implements WA HB 1337, which requires cities to allow up to two ADUs per lot. Detached and attached ADUs are both allowed.
Key details: Maximum per lot: Up to 2 ADUs under HB 1337. Typical size cap: About 1,000 square feet. Owner occupancy: Not required statewide. Parking: Reduced near transit. Permits: Building, plumbing, mechanical, electrical.
Contact your local code enforcement office for specific penalty information.
If you are coming from a city with tighter rules, you will find Kent gives residents more flexibility on adu rules.
The Bottom Line
Compared to many U.S. cities, Kent gives residents more room on accessory structures. 4 of the 9 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.
Keep in mind that Kent can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.