Lynnwood, WA Accessory Structures: ADU Impact Fees (2026)
Key Facts
- PIF rate for ADUs
- $5,007.62 per unit
- Classification
- Residential multifamily (Note 2)
- Single-family rate (comparison)
- $6,969.54 per unit
- Admin fee
- $300.00
- Rate period
- Jan 1, 2026-Dec 31, 2027
- Governing chapter
- LMC 3.107, Park Impact Fees
- Adjustment cycle
- Every two years
Summary
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.
| 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 impact fee assessment.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 3512, passed May 26, 2026).
Full Breakdown
070. 160. 62 per unit for two-bedroom and three-plus-bedroom units. 54 single-family rate or a separate ADU-specific figure. 00 fee for an independent fee calculation if the owner disputes the standard rate. These figures come from the city's park impact fee rate studies, and Washington's Growth Management Act framework requires the fees to be tied to a capital facilities plan; the fee is due, and collectable, at building permit issuance under the PIF chapter's development-approval trigger.
Violations & Fines
A permit applicant cannot obtain a building permit for an ADU without paying the assessed park impact fee, since the PIF is collected as a condition of development approval under LMC 3.107.050. An owner who disputes the standard multifamily rate may request an independent fee calculation for a $300.00 fee, or request a payment deferral for a $300.00 administrative fee, but cannot avoid the underlying $5,007.62 assessment by classifying the ADU as single-family.
Frequently Asked Questions
How much is Lynnwood's park impact fee for an accessory dwelling unit?
Why are ADUs charged the multifamily rate instead of the single-family rate?
Can I dispute Lynnwood's park impact fee amount for my ADU?
Sources & Official References
Other rules in Lynnwood
Compare Lynnwood to another location·View the Washington accessory structures overview
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ADU Impact Fees in Nearby Cities
How other cities in Snohomish County handle adu impact fees.