Edmonds offers homeowners one of the Puget Sound region's most flexible opportunities to build an Accessory Dwelling Unit (ADU). Whether you're planning a backyard cottage for rental income, creating a home for family members, or increasing the long-term value of your property, understanding Edmonds' development standards before beginning design can save time, reduce costs, and prevent unexpected surprises during permitting.

Recent updates to the City's ADU regulations have expanded housing opportunities while preserving the character of Edmonds' residential neighborhoods. Homeowners now have greater flexibility in how they develop their property, but every lot remains unique. Zoning, setbacks, utilities, drainage, trees, and site conditions continue to influence what can ultimately be built.

Many qualifying residential properties can now accommodate up to two ADUs, allowing homeowners to build an attached ADU, a detached backyard cottage, or a combination of both where permitted.

Edmonds now allows detached ADUs up to 1,200 square feet, providing homeowners with greater flexibility to create comfortable living spaces while maintaining neighborhood character. Whether you're planning a one-bedroom guest cottage or a larger two-bedroom home, understanding the City's size limits early helps ensure your project aligns with current development standards.

One of the most significant changes to Edmonds' ADU regulations is the removal of the owner-occupancy requirement. Homeowners now have greater flexibility in how they use their property, making ADUs an attractive option for long-term rental income, multigenerational living, or future retirement planning.

Edmonds now allows ADUs to be sold separately as condominiums when all applicable legal requirements are satisfied. While this option is not appropriate for every project, it creates additional flexibility for homeowners considering long-term investment strategies or future property ownership arrangements.

The City has updated several development standards to make ADU projects more practical while maintaining neighborhood compatibility.

Homeowners benefit from improvements such as:

• Detached ADUs up to 24 feet in height
• Reduced rear setback requirements
• No additional off-street parking requirement
• Greater flexibility for garage conversions
• Opportunities for attached or detached ADUs

These changes make it easier for many properties to accommodate an ADU than in previous years.

Although Edmonds has modernized its ADU regulations, every property presents its own opportunities and constraints.

Some of the most common factors affecting ADU feasibility include:

• Lot size and configuration
• Existing utilities
• Trees and landscaping
• Drainage
• Easements
• Slopes
• Critical areas
• Building placement
• Neighborhood zoning

These property-specific conditions often influence project cost more than the zoning regulations themselves.

One of the biggest mistakes homeowners make is investing in architectural plans before understanding what their property can realistically support.

Our feasibility study evaluates zoning, setbacks, utilities, drainage, easements, trees, access, and anticipated construction considerations before design begins. This process provides a clear understanding of your property's development potential while helping avoid costly redesigns later in the project.

At DADU Solutions, we believe every successful ADU project begins with understanding the property before designing the building.

Our feasibility-first approach helps homeowners identify opportunities, understand development standards, and make informed decisions before investing in architectural plans. By evaluating your property early, we help create a smoother path from concept to permitting—and ultimately to a successful ADU project.

Know Before You Build.