Smoke Detectors: Redmond vs Seattle
How do smoke detectors rules compare between Redmond, WA and Seattle, WA?
Redmond and Seattle have similar restriction levels.
Redmond, WA
King County
Smoke alarms are required in every sleeping room, outside sleeping areas, and on every floor of Redmond homes per IRC R314 as adopted by RMC 15.04, with CO alarms required under RCW 19.27.530.
View full Redmond 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 | Redmond | Seattle |
|---|---|---|
| Required Locations | Every bedroom, outside bedrooms, each floor | - |
| CO Alarm Law | RCW 19.27.530 | - |
| Code | IRC R314 via RMC 15.04 | RCW 19.27 IRC R314 |
| Rental Rule | Required before occupancy | - |
| Free Checks | Redmond Fire Dept | - |
| Every Sleep Room | - | Required |
| New Construction | - | Hardwired + interconnected |
| CO Alarms | - | Required RCW 19.27.530 |
| 10-year Battery | - | Allowed existing homes |
Highlighted rows indicate differences between cities.
Redmond FAQ
How many smoke alarms does my Redmond home need?
One in every bedroom, one outside each sleeping area, and one on every floor including the basement per IRC R314.
Are carbon monoxide alarms required?
Yes. Washington RCW 19.27.530 requires CO alarms outside each sleeping area in homes with attached garages or fuel appliances.
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.
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