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Lakewood, WA Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Lakewood, WA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Max ADUs per lot: 2 (1 if critical area/buffer)
Max detached ADU size: 1,200 sq ft, excluding garage
Parking requirement: 1 off-street space, transit waiver available
Governing section: LMC 18A.40.110(B)(1)
Late/unpermitted penalty: Up to $500/day, LMC 1.44.040

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Washington under recent ADU streamlining laws. The Lakewood, WA rules below cover local size, height, and setback requirements.

Summary

Lakewood, Washington allows up to two accessory dwelling units on any lot with a detached single-family home, duplex, triplex or townhome under LMC 18A.40.110(B)(1). Detached and most attached ADUs are capped at 1,200 square feet excluding the garage, and each must meet the principal dwelling's setback, lot coverage and height standards.

1. Accessory dwelling units (ADUs) are permitted when added to, created within, or detached from a principal dwelling unit subject to the following restrictions: a. Up to two (2) ADUs shall be allowed as accessory uses in conjunction with any detached single-family structure, duplex, triplex, townhome, or other housing unit. ADUs shall not be included in the density calculations. A lot shall contain no more than two (2) ADUs. ... e. ... The maximum size of an attached ADU contained within or attached to an existing single-family structure shall be limited by the existing structure’s applicable zoning requirements. The maximum size of all other attached and all detached ADUs shall be no more than one thousand two hundred (1,200) square feet, excluding the garage. ... h. ... A minimum of one (1) off-street parking space shall be required for the ADU, in addition to the off-street parking required for the principal dwelling, pursuant to LMC 18A.80.030(F).

View official code

Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 852, passed June 15, 2026).

Full Breakdown

110(B)(1), an ADU can be built inside, added to, or fully detached from the main house, and a lot may hold no more than two. Lots carrying a critical area or its buffer, such as wetland or steep-slope property near American Lake or Gravelly Lake, are limited to one ADU. An attached ADU built into an existing single-family structure is sized by that structure's own zoning limits; every other attached or detached ADU tops out at 1,200 square feet, not counting the garage. The city requires a minimum size sufficient to meet Title 15's construction standards, and an attached unit's facade, roof pitch and siding must match the principal dwelling.

030(F), unless the lot sits within a quarter mile of a Pierce Transit route or a half mile of the Sound Transit Lakewood Station or another stop with 15-minute peak service, in which case the Director can waive that space if on-street capacity is adequate. 34 RCW. 681, and the city carries no civil liability for issuing an ADU permit that a private covenant purports to forbid.

Violations & Fines

Building or expanding an ADU outside these standards, without a permit, or beyond the 1,200-square-foot cap is a City Code violation. Absent a more specific penalty, LMC 1.44.040's general civil penalty applies: up to $500.00 for each day the violation continues, and the City Manager or designee can also issue a notice of violation or a stop-work order under Chapter 1.44 LMC before any fine is assessed.

Frequently Asked Questions

How many ADUs can I build on my Lakewood lot?

Up to two under LMC 18A.40.110(B)(1)(a), as long as your lot holds a detached single-family home, duplex, triplex, townhome or other housing unit. Neither ADU counts toward the lot's density calculation. If your lot includes a mapped critical area or its buffer, the limit drops to one ADU under subsection (b).

How big can a detached ADU be in Lakewood?

No more than 1,200 square feet, excluding the garage, per LMC 18A.40.110(B)(1)(e). An ADU built inside an existing single-family home is instead limited by that structure's own zoning envelope rather than the flat 1,200-square-foot cap.

Do I need extra parking for an ADU?

Yes, one off-street space in addition to what the main house requires, per LMC 18A.40.110(B)(1)(h) and LMC 18A.80.030(F). That requirement is waived if the lot is within a quarter mile of a Pierce Transit bus route or a half mile of a frequent Sound Transit stop and the Director finds on-street capacity is adequate.

Sources & Official References

[1]Lakewood Municipal Code, Title 18A

Other rules in Lakewood

Shed & Carport RulesSome Restrictions Garage ConversionsSome Restrictions Parking Rules: EV ChargingLight Restrictions Parking Rules: Loading ZonesSome Restrictions Animal Ordinances: Wildlife FeedingSome Restrictions Animal Ordinances: Mandatory Spay/NeuterSome Restrictions Animal Ordinances: Exotic PetsHeavy Restrictions Environmental Rules: Boat Dock PermitsSome Restrictions

All Lakewood rules

How Lakewood compares: Easiest Cities to Build an ADU·Compare Lakewood to another location·View the Washington accessory structures overview

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