Washington State’s New Housing Laws: What Kitsap Owners and Investors Need to Know
Here’s what I know: the rules around what you can build, how many units you can add, and how much parking you have to provide have been changing fast in Washington — and a lot of property owners and investors in Kitsap are still operating on yesterday’s assumptions.
The Legislature has been pushing pro-housing bills hard. Some of this is background noise. Some of it is genuinely significant for anyone with a piece of land, an existing rental, or a development plan that made sense two years ago. Here’s what changed and what it means on the ground.
More units, simpler lot splits
What changed
HB 1096 expanded middle-housing rules statewide and made lot splits simpler — owners can now divide lots via an administrative process with no appeal window. That’s a meaningful shift from the public-hearing gauntlet that previously slowed or killed small infill projects.
What it means for you
If you own a lot that you’ve assumed could never be split, or a property where an ADU felt too complicated to pursue, that calculation may have changed. The state is actively pushing local jurisdictions to open up to more units and new formats — which means “my city would never allow that” is a less reliable assumption than it used to be.
“If you’re thinking about adding an ADU, splitting a lot, or doing a small infill project, verify current state-driven rules — not what your neighbor did five years ago and not last year’s city handout.”
Parking minimums are shrinking
What changed
SB 5184 rolled back parking minimums for many small homes, ADUs, and multifamily buildings — especially near transit or for smaller units. If your project penciled out before but got killed by required parking, it’s worth re-running the math.
What it means for you
The risk here runs both directions. Investors who haven’t updated their assumptions may be over-building costly parking that’s no longer required — that’s money and square footage going to a requirement that no longer exists. Buyers evaluating sites need to check what today’s standard actually is, not what it was when the last comparable project was built.
“If a parking requirement was the reason your infill project didn’t work before, that math may look different now. Check the current standard before you walk away.”
The builder’s remedy: what it means if a city falls behind
What changed
SB 5148 introduced a builder’s remedy concept: if a city or county’s housing plan isn’t compliant with state law, the state can force approval of residential projects that meet certain affordability standards — even if the local jurisdiction would normally say no.
What it means for you
This one is mostly background pressure for now, but it signals something important: cities and counties that drag their feet on housing plan compliance are increasingly exposed to projects being approved over their objections. For investors watching specific jurisdictions, it’s worth knowing whether a given city is in compliance — and what changes if it isn’t.
“If a city falls out of compliance with its housing plan, are you positioned to benefit from more flexible entitlements — or would more competition catch you off guard?”
Co-living and missing-middle: new formats cities must allow
What changed
New rules require cities and counties to adopt co-living and missing-middle housing formats — things like duplexes, triplexes, courtyard housing, and rooming houses in areas that previously only allowed single-family. Most jurisdictions had until late 2025 to get their codes in line.
What it means for you
The practical implication: properties that used to be single-family-only may now have more options than the listing assumes. That’s relevant whether you’re buying, selling, or evaluating what a property is actually worth in its current regulatory environment. The failure risk is assuming the old single-family designation is still the whole story.
“If a property’s zoning has been updated to allow middle housing, is that reflected in how it’s being marketed — and in how you’re underwriting it?”
The pattern in all of it
Washington is systematically loosening the restrictions that kept density low and permitting slow. That’s mostly good news for owners who want to add units, split lots, or build more flexibly. The risk is assuming the old rules still apply and building plans — or making purchase decisions — based on expired facts.
The state’s direction of travel is clear. The details still vary by jurisdiction, and implementation is uneven. That makes checking current local codes more important, not less — because the gap between what state law allows and what your city has actually adopted can still trip up a project.