Smoke Detectors: Bellevue vs Seattle
How do smoke detectors rules compare between Bellevue, WA and Seattle, WA?
Bellevue and Seattle have similar restriction levels.
Bellevue, WA
King County
Bellevue follows Washington State Building Code requiring smoke alarms in every bedroom, outside sleeping areas, and on every level, plus CO alarms under RCW 19.27.530.
View full Bellevue rules →Seattle, WA
King County
Smoke alarms required in all King County dwellings per WA Building Code (RCW 19.27, IRC R314). New construction needs hardwired interconnected alarms with battery backup; battery-only allowed in existing homes.
View full Seattle rules →Key Facts Comparison
| Fact | Bellevue | Seattle |
|---|---|---|
| - | - | |
| Every Sleep Room | - | Required |
| New Construction | - | Hardwired + interconnected |
| CO Alarms | - | Required RCW 19.27.530 |
| 10-year Battery | - | Allowed existing homes |
| Code | - | RCW 19.27 IRC R314 |
Highlighted rows indicate differences between cities.
Bellevue FAQ
Seattle FAQ
Can I use battery-only smoke alarms in my older home?
Yes, battery-only alarms are legal in existing homes not undergoing permitted remodel. 10-year sealed-battery units are recommended and meet the state standard.
Do I need a carbon monoxide alarm?
Yes if your home has any fuel-burning appliance (gas furnace, gas stove, gas water heater, gas fireplace, or wood stove) or an attached garage. Required statewide since 2013.
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