Walla Walla, WA, Municipal Code

Updated June 2021

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Accessory Dwelling Units

The city's zoning code permits one internal, attached, or detached accessory dwelling unit (ADU) by right for any legal single-family home or duplex (§20.118.030). Use-specific standards address maximum size, building permits, and entrances.

Residential Infill Development

The city's zoning code permits a wide range of "missing middle" housing types by right in its lowest density residential district (§20.100.040.F). These types include duplexes, triplexes, fourplexes, and cottage housing.


Walla Walla, WA

2010 Population: 31,731

2010 Population Density: 2,478.02/square mile