Zoning laws are one of the most important — and often overlooked — factors which shape local real estate markets. Zoning determines what types of buildings can go where, how dense development can be, and what kinds of properties can be bought, sold, or built. To put it plainly, zoning regulations have a direct impact on home values, affordability, and availability.
For decades, most residential land in Snohomish County was zoned exclusively for single-family homes. This limited housing supply, and pushed prices upward, while restricting options for buyers and renters who may desire to live in a condominium, duplex, or townhouse. But in 2023, Washington State passed new legislation that is reshaping the real estate landscape. One major shift came with House Bill 1110, which now requires many cities to allow for “middle housing” (i.e., duplexes, triplexes, and fourplexes) on land that previously allowed only one home per lot. For real estate professionals, this will begin opening doors to new development opportunities, higher land use potential, and increased buyer interest in properties that now have more flexibility.
In larger cities, the impact of HB 1110 is even greater. Cities over 75,000 people must allow up to six units on a single lot near frequent transit or if affordability criteria are met. This not only increases density but could also unlock significant value for property owners who once had limited options for development or resale. Investors and developers are paying close attention to how each city implements these changes through local zoning updates.
Another key piece of legislation, House Bill 1337, directly affects how accessory dwelling units (ADUs) – also known as backyard cottages – are treated in local zoning codes. The new law removes many barriers that discouraged ADU construction, including off-street parking requirements and owner-occupancy rules. Once implemented, such changes will enhance the versatility and market appeal of single-family properties by allowing owners to add rental units or create multigenerational housing. From a real estate standpoint, homes that support ADUs often carry greater long-term value and offer more flexibility for both buyers and sellers.
Both HB 1110 and HB 1337 are currently being integrated into city codes in places like Everett, Monroe, Mountlake Terrace, and others. Real estate professionals who stay ahead of these changes can better advise clients on future growth areas, redevelopment potential, and shifting market dynamics.
For homeowners, investors, and REALTORS®, zoning laws are no longer just background policy, they’re a key driver of property value, development opportunity, and neighborhood change. A lot that once held only one home may now be eligible for multiple units.
As local governments implement these state mandates through zoning code changes and land use updates, the ripple effects will be felt across the real estate market. Understanding how zoning affects what you can do with a property — and what your neighbors can do — has never been more important. For anyone involved in real estate, from first-time buyers to seasoned investors, staying informed about zoning changes is not just helpful, it’s essential.
For more information about buying or selling a home, be sure to work with a REALTOR®, a member of the National Association of REALTORS®. Snohomish County Camano Association of REALTORS® is the voice for real estate in Snohomish County. If you have questions for The Expert about real estate email us at [email protected], or visit www.sccar.org for more information.
