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All ADU Regulations

Redmond, Washington

Redmond is a perfect place to build an ADU. Here are its up-to-date ADU rules.
Updated Jul 21, 2023


Redmond, Washington is a lively city on the northern edge of Lake Sammamish, located 16 miles northeast of Seattle. Redmond features plenty of natural scapes and views, boasting over 1,358 acres of parks and open space, as well as 39 miles of developed trails furnished throughout the city. The city is a center for technology and is home to several high-tech companies, making Redmond a bustling place to work, visit, and relax!


Accessory Dwelling Unit (ADU) projects must meet all of Redmond’s Zoning Code requirements, specifically Chapter 21.08.220. A property's zone is available on Redmond's Zoning Map or within the City's property database.

Number of units

A property can have one ADU on each residential lot in addition to any new or existing detached single-family dwelling unit.

Building size

The maximum size of an ADU in Redmond is 50% of the primary dwelling unit size, no greater than 1,500 square feet.


The setback for ADUs in Redmond is 5 feet from any interior side or rear property line. May not be located within the front yard setback.


One (1) off-street paved parking stall is required. Excess existing parking space may be utilized.


Either the primary dwelling unit or the ADU must be occupied by an owner of the property.
Cottage is here to help you navigate the process. Reach out to us and we’ll help you build a custom ADU to fit your unique property characteristics and local regulations!

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