Detector chirps intermittently even after changing the battery
Electrical · Greater Seattle
Smoke Detector Installation in Greater Seattle
Smoke detector installation typically runs $120 to $300 depending on the number of units and whether they're hardwired or battery-powered. SPS Pro Services installs interconnected smoke alarms that meet Washington state fire code across King and Snohomish counties, from older Seattle bungalows to newer Everett and Lynnwood construction, ensuring every bedroom and hallway is properly covered.
Licensed, bonded & insured in WashingtonMon–Fri 8am–6pm · 24/7 emergencies
Smoke detector installation covers mounting new alarms, wiring interconnected units so every detector sounds together, testing existing circuits, and replacing outdated units past their 10-year service life. Homeowners typically need this service when buying an older home without hardwired alarms, finishing a remodel that adds bedrooms, or when detectors start chirping and won't stop. Washington fire code requires a working smoke alarm in every bedroom, outside sleeping areas, and on each level of the home.
Symptoms we see daily
Signs you need smoke detector installation
Alarm is more than 10 years old, check the manufacture date printed on the back
A remodel or addition created a bedroom without its own smoke alarm
A home inspection flagged missing or non-interconnected detectors
Pressing the test button doesn't trigger the alarm to sound
No surprises
How a smoke detector installation visit works
1
Phone consultation
We ask about your home's layout, number of bedrooms and levels, and whether existing alarms are hardwired or battery-only so we can quote accurately before arrival.
2
On-site assessment
An electrician checks current alarm placement against Washington fire code, tests existing units, and identifies any wiring already in place behind walls or ceilings.
3
Installation
We mount and wire hardwired units where wiring exists, run new circuits when needed, and interconnect alarms so every unit sounds together during an alert.
4
Testing
Every alarm is tested individually and as an interconnected system to confirm each unit triggers the others and sounds at proper volume.
5
Walkthrough
We show you battery backup locations, explain the 10-year replacement timeline, and answer questions about maintenance before we leave.
Why quotes range from $120 to $300
These factors decide where your job lands in the range — and we walk you through each one on the written quote.
- Number of bedrooms and floors that need coverage under Washington fire code
- Hardwired, interconnected systems cost more upfront than battery-only units
- Older homes, especially pre-1980s construction with plaster or lath walls, often need new wiring runs
- Access difficulty in vaulted ceilings, finished basements, or additions without existing electrical access
Flat-rate pricing
Smoke Detector Installation — what it costs
Conservative ranges for the Seattle metro. Your written quote is exact before work begins.
| Job | Typical price |
|---|---|
| Diagnostic / service callCredited toward the work we do | $120 |
| Minor smoke detector installationSingle small component or adjustment | $120–$180 |
| Typical smoke detector installationThe most common jobs we see | $180–$240 |
| Major smoke detector installationBig-ticket parts and labor | $240–$300 |
Prices reviewed by Sergei Petrov · July 2026. Parts availability can shift ranges — the quote you sign is final.
24/7 Emergency Line
Emergency dispatchNo power at 11pm? We pick up.
Office hours are Mon–Fri, but the emergency line never closes. Call any hour and we dispatch a licensed tech across Greater Seattle.
Straight answers
Smoke Detector Installation questions we hear most
Does Washington state require hardwired smoke detectors?
Washington fire code requires smoke alarms in every bedroom, outside each sleeping area, and on every level of the home. New construction and major remodels need hardwired, interconnected alarms with battery backup. Older homes being resold often need upgrades if existing detectors are battery-only or not interconnected, especially during real estate transactions in King and Snohomish counties.
How long do smoke detectors last?
Most smoke detectors last about 10 years from the manufacture date printed on the back of the unit, not the installation date. After that, the sensor degrades and won't reliably detect smoke even with fresh batteries. If you're unsure of the age, our electricians check it during the assessment and recommend replacement if it's expired.
What's the difference between hardwired and battery smoke detectors?
Hardwired detectors connect to your home's electrical system and interconnect so every alarm sounds when one detects smoke, with battery backup for power outages. Battery-only units are simpler to install but don't communicate with each other. Most homes built after the 1990s in Western Washington already have wiring in place, which lowers installation cost.
Can I install smoke detectors myself instead of hiring an electrician?
Battery-only detectors are simple DIY swaps, but hardwired interconnected systems involve working on home electrical circuits and sometimes local permitting. Licensed electricians make sure placement meets Washington fire code, wiring is done safely, and interconnection works correctly across every unit, which matters most during home sales and inspections.
Senior Electrician, SPS Pro Services
Washington 01 Journey Level Electrician12+ years in the trade
Reviews the pricing and service guidance on this page against SPS Pro Services's actual job records across King and Snohomish counties.
Prices reviewed July 2026
Need smoke detector installation? Get a straight answer today.
Call (206) 427-8907 to schedule smoke detector installation or an upgrade, serving King and Snohomish counties Monday through Friday, 8am to 6pm.