Marysville ADU Requirements and Zoning Laws — Washington

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ADU Regulations in Marysville, Washington

Updated September 29, 2026

In Snohomish County north of Everett, Marysville permits ADUs under Washington's HB 1337 which limits local restrictions. The city's growing residential neighborhoods welcome accessory units by right.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Marysville as of 2026. Regulations are governed by Washington's HB 1337 (2023) which limits local ADU restrictions statewide.

Regulation	Requirement
Maximum Size	1,000 sq ft
Property Setbacks	5 ft rear, 5 ft side
Extra Parking Required	Not required (near transit)
Owner Occupancy	Not required

Additional Local Requirements for Marysville

ADU by right in residential zones
Minimum 200 sq ft
WA HB 1337 limits local restrictions

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Frequently Asked Questions About ADUs in Marysville

Can I build an ADU in Marysville?

This Washington city follows HB 1337 which limits local ADU restrictions. Parking may be waived near transit.

What is the maximum ADU size allowed in Marysville?

ADUs in Marysville can be up to 1,000 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Marysville planning department before designing your project.

What are the setback requirements for an ADU in Marysville?

ADUs in Marysville generally require setbacks of 5 ft rear, 5 ft side. Washington's HB 1337 (2023) limits how restrictive local ADU rules can be, but the exact setback figures come from Marysville's own land use code — confirm them with the city before you design.

Disclaimer: This guide summarises publicly available city zoning rules and is for general information only — it is not legal or architectural advice. Codes change; always confirm current requirements with the Marysville planning department before you design or build.

Marysville ADU Zoning Rules & Permit Guide