Accessory Structures in Lynnwood, WA (2026)
3 verified accessory structures rules for Lynnwood, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Lynnwood defines an accessory dwelling unit (ADU) as 1,000 square feet or less, either attached (AADU) or detached (DADU), under LMC 8.99.0250(A), and permits ADUs by right in the RN, RM-45, NC, and CDM zoning districts per the Title 8 use table.
Lynnwood Accessory Dwelling Unit Zoning Rules
Some RestrictionsLynnwood Municipal Code § 8.99.0250(A)
Accessory Dwelling Unit. A dwelling unit of 1,000 square feet or less located on the same lot as a single-family housing unit, duplex, triplex, townhome, or other housing unit. Often abbreviated as “ADU.” There are two common types of ADUs: a. Attached Accessory Dwelling Unit. An accessory dwelling unit located within or attached to one of the above housing units. Often abbreviated as “AADU.” b...
ADU Impact Fees
Lynnwood charges a park impact fee on every new accessory dwelling unit because the city's Table 3.104.030 fee schedule classifies ADUs as residential multifamily housing for PIF purposes, not as a free-standing single-family addition. Under the 2026-2027 rate table that classification currently sets the per-unit fee at $5,007.62, due before the city issues a building permit.
Lynnwood ADU Park Impact Fee: $5,007.62
Some RestrictionsLynnwood Municipal Code § 3.104.030, Table 3.104.030 (Park Impact Fee Schedule), Note 2
| Row | Type of Development | Unit of Development | Impact Fee per | | | | | Unit of Development | ... | 4 | Residential – Multifamily (2- Bedrooms) | dwelling unit | $5,007.62 | ... Note 2: Accessory dwelling units (ADUs) are classified as residential multifamily for purposes of park impa...
Shed & Carport Rules
Lynnwood splits residential accessory buildings into Type 1 (one per unit, 64 square feet, 8-foot height limit, 1-foot interior setback) and Type 2 (unlimited number, 480 square feet each, 15-foot height, 5-foot interior setback) under LMC 8.30.0810.
Lynnwood Accessory Building Size and Setbacks
Some RestrictionsLynnwood Municipal Code § 8.30.0810(A)(2)
2. Accessory Buildings and Structures. a. Accessory buildings do not include habitable dwelling units. b. Only one Type 1 building or structure is permitted per unit. c. All other accessory buildings and structures must meet Type 2 requirements. d. Any number of Type 2 buildings are allowed, provided the primary dwelling unit and all Type 2 buildings do not exceed relevant floor area ratio stan...
Looking for Snohomish County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Lynnwood city rules.
Accessory Structures in Snohomish County →