How is Snohomish County Implementing HB 1110 and 1337 before the 6/30/2025 deadline?...and Middle Housing Q and A

by Shauna Naf

Jun 07, 2025

JUNE 6, 2025

Issue 3

How is Snohomish County Implemeting HB 1110 and 1337?

Snohomish County updated their Comprehensive Plan in December of 2024 (you can review the full Comprehensive Plan and accompanying documents and maps here: https://www.snohomishcountywa.gov/5597/2024-Update). Cities in Snohomish County have until the end of June to implement the changes outlined in House Bill 1110 (middle housing) and House Bill 1337 (the ADU bill).

As a quick reminder, HB 1110 would apply to cities with a population over 25,000, allowing at least duplexes throughout, but HB 1337 allows for ADUs both within city limits as well as the urban growth area (which is generally in the county jurisdiction, not the city). There are also some cities that have fewer than 25,000 people but that are located in counties with a population of more than 275,000 and who also share an urban growth area with the largest city in the county to whom HB 1110 applies.

Snohomish County just updated their ADU FAQ for urban growth areas that are under their jurisdiction: https://snohomishcountywa.gov/DocumentCenter/View/8052/12---Accessory-Dwelling-Units-Detached-PDF

How are other Snohomish cities progressing in implementing HB 1110 and 1337? Read on!

Subscribe to keep reading this post

Already have an account? Log in

Black Friday Sale - ALL COURSES ON SALE NOW!

Issue 25 What do we want for Christmas? MORE HOUSING! Sorry - my magic wand is in the shop, but I HAVE created a special coupon code to help spread the word about middle housing. Take a look at my video below and use the code BLACKFRIDAY2025 by December 9th to get 50% off all courses INCLUDING FULL ACCESS! Have a wonderful Thanksgiving week, everyone! ...

The 7 Features We Expect Will Drive Home Search in The Future (it's not about starting with townhouses or condos anymore)

Issue 24 You may recall in last week's article, we took a look at supply and pricing trends in Seattle around single family detached homes and a new bucket of product that includes the following for-ownership product: Condoized detached ADUs and cottages Condoized attached ADUs and multi-family units (2-6 units) Condos (traditional condos in a building) Townhomes We had a great conversation...

How Will ADUs and Middle Housing Impact Future Appreciation For Smaller Product?

Issue 23 This week, Denise and I were sent a question about a specific project which has us thinking about a more-general question that should be on the minds of real estate agents far and wide. As more types of middle housing are built, how is that going to impact appreciation rates for smaller housing product in the future? We are actually already seeing the impact of this in Seattle. Let's...

ADUs and Middle Housing Report

Keeping real estate professionals up to date on Middle Housing news across Washington State far and wide! Includes news, middle housing Q and A, updates, resources, and more!