Density Bonus Law: Kent vs Seattle
How do density bonus law rules compare between Kent, WA and Seattle, WA?
Kent and Seattle have similar restriction levels.
Kent, WA
King County
KCC Title 21A grants density bonuses, height increases, and reduced parking when projects in unincorporated King County provide deed-restricted affordable housing or other public benefits.
View full Kent rules →Seattle, WA
King County
Seattle's Mandatory Housing Affordability program (SMC 23.58B-C) grants extra height and FAR in upzoned areas in exchange for on-site affordable units or in-lieu fees. MHA evolved from the 2015 HALA framework.
View full Seattle rules →Key Facts Comparison
| Fact | Kent | Seattle |
|---|---|---|
| Key code | KCC 21A.34 | - |
| Affordability term | At least 50 years | - |
| State authority | RCW 36.70A.540 | - |
| Bonus targets | Urban growth areas | - |
| Code | - | SMC 23.58B-C |
| On-site share | - | 5-11% |
| Fee range | - | $7-$32/sq ft |
| AMI cap | - | 60% rent / 80% own |
Highlighted rows indicate differences between cities.
Kent FAQ
Do single-family lots get density bonuses?
Density bonuses primarily apply to multifamily, mixed-use, and ADU rules. Single-family lots benefit through ADU and detached ADU allowances under separate code sections.
Are bonus units rent-restricted forever?
Restrictions usually run 50 to 99 years. The exact term and AMI limits appear in the recorded covenant required at permit issuance.
Seattle FAQ
Does MHA apply to small additions?
No. MHA triggers on projects of three or more residential units or significant commercial floor area in MHA-zoned districts; small remodels and ADUs are exempt.
Can I pay a fee instead of building affordable units?
Yes. The in-lieu payment goes to the Office of Housing's affordable housing fund. Many developers choose the fee, especially in high-cost neighborhoods.
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