Green Building Code: Bellevue vs Seattle
How do green building code rules compare between Bellevue, WA and Seattle, WA?
Bellevue and Seattle have similar restriction levels.
Bellevue, WA
King County
King County buildings must meet the Washington State Energy Code under RCW 19.27A, one of the strictest in the nation; the county's Strategic Climate Action Plan also drives green-building incentives toward carbon neutrality by 2050.
View full Bellevue rules →Seattle, WA
King County
Seattle's Energy Code SMC 22.901 is among the strictest in the U.S., paired with the Living Building Pilot SMC 23.40.060 offering zoning incentives for ultra-green projects. Building Emissions Performance Standard SMC 22.925 covers existing buildings.
View full Seattle rules →Key Facts Comparison
| Fact | Bellevue | Seattle |
|---|---|---|
| Energy code | RCW 19.27A / WSEC | - |
| Update cycle | Every 3 years | - |
| County plan | SCAP carbon-neutral 2050 | - |
| Incentives | Green Building Program | - |
| Energy Code | - | SMC 22.901 |
| Living Building | - | SMC 23.40.060 |
| BEPS | - | SMC 22.925 |
| Net zero | - | By 2050 |
Highlighted rows indicate differences between cities.
Bellevue FAQ
Does King County require all-electric new construction?
The 2021 Washington State Energy Code under RCW 19.27A heavily restricts natural-gas heating in new commercial and large multifamily, effectively requiring electrification.
Are there incentives for green building in King County?
Yes, the King County Green Building Program offers technical help and incentives aligned with the Strategic Climate Action Plan's 2050 carbon-neutral goal.
Seattle FAQ
What is the Living Building Pilot?
A program offering up to 25% extra floor area or height for projects certified under the Living Building Challenge or meeting equivalent net-zero water, energy, and waste targets.
Does BEPS apply to my apartment building?
Only if the building is over 20,000 sq ft. Smaller multifamily and most homes are exempt; affordable housing has additional exemption pathways.
Compare other topics
See how Bellevue and Seattle compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool