Smoke Detector Installation in Sammamish WA

Smoke Detector Installation in Sammamish, WA

Most Sammamish homes were built between 1995 and 2015 — which means a large number of original hardwired smoke detectors are now at or past their 10-year expiration date. Washington State requires hardwired, interconnected detectors in all bedrooms, outside each sleeping area, and on every level. Replacement cost: $100–$175 per unit installed, with a typical Sammamish home running $300–$650 total.

10-Year Rule — Is Your Home Due?

Smoke detectors manufactured before 2014 or 2015 are past or approaching end-of-life. If your Sammamish home was built between 1995 and 2010 and the detectors have never been replaced, they're overdue. Expired detectors may fail to sound in an actual fire even if they chirp when you test them. This is one of the most important — and most overlooked — safety items in any home.

Combination Smoke + CO Detectors

Washington code requires CO detectors on each level of homes with attached garages or gas appliances — standard features in most Sammamish homes. Combination smoke/CO units eliminate the need for separate CO-only devices. We install Kidde and First Alert combination units. Cost: $125–$175 per unit installed.

Full Home Replacement

Replacing all detectors in one visit is the cleanest approach — they'll all expire around the same time anyway, and doing them together keeps the interconnected system on the same generation of hardware for maximum compatibility. We'll map every required location, replace all units, test the interconnect, and confirm everything sounds together. A typical 4-bedroom Sammamish home: $450–$700 total.

Cost Summary — Sammamish WA

• Replace single hardwired detector: $100–$150 per unit
• Smoke + CO combination unit: $125–$175 per unit
• Whole-home replacement (4 bed): $450–$700 total
• New location (new wiring): $175–$300

Our house was built in 2001 and still had the original detectors. They replaced six units with combination smoke/CO detectors, tested everything, and were done in under two hours.

- Sammamish homeowner, June 2026

Book Smoke Detector Service in Sammamish

Call 425-210-4791 or request a free estimate online. We also serve Bellevue, Issaquah, Redmond, and Newcastle.