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Smoke & Carbon Monoxide Detector Installation in Quantico & Northern Virginia
We replace old hardwired smoke alarms and add smoke and carbon monoxide (CO) alarms where your home needs them, linked so one alarm sets off all of them. Replacing alarms on existing wiring usually takes one visit of a few hours for a whole house.
- Expert electrician
- 20+ years of experience in the industry
- Emergency calls 24/7
When to call
- Your smoke alarms are 10 years old or older (check the date on the back)
- An alarm chirps even after a new battery
- You have gas heat, a gas stove, a fireplace or an attached garage, and no CO alarm
- Your alarms are not linked, so one alarm does not set off the others
- You finished a basement or added a bedroom
Step by step
- We check the alarms you have, their age and how they are wired.
- We plan where each smoke and CO alarm should go.
- We agree on the price and a time.
- We replace or add the alarms, link them, and set the backup batteries.
- We test every alarm so you hear them all sound together.
What it costs
Typical Northern Virginia market range (not a quote)
| Job | Market range |
|---|---|
| Hardwired smoke or combo smoke/CO detector, replace existing (unit included) | $100 to $200 per detector |
Market data for Northern Virginia, not a quote from Electric Sandro. Checked November 2026. Sources: Angi, HomeGuide, Fixr, and prices published by one Northern Virginia electrician. Your price depends on your home, the parts and the permit fee.
Done to code
Check the rule for your town in our Northern Virginia electrical permit checker.
Smoke & CO Detectors: our work and ideas
Photos marked "by Electric Sandro" are real jobs. Others show the kind of work we do.
Smoke & CO Detectors questions
Straight answers to what Northern Virginia homeowners ask most.
How often should smoke detectors be replaced?
The National Fire Protection Association says to replace smoke alarms when they are 10 years old. The date is printed on the back of the alarm.
Where should smoke alarms go in a house?
The NFPA recommends one inside each bedroom, one outside each sleeping area, and one on every level of the home, including the basement.
Where should a carbon monoxide detector go?
Put CO alarms outside each sleeping area and on every level of the home, as the alarm maker directs. Homes with gas appliances, a fireplace or an attached garage need them most.
Why is my hardwired smoke detector chirping?
A single chirp every minute or so usually means the backup battery is low. If it keeps chirping with a new battery, the alarm may be at the end of its life and needs replacing.
Do hardwired smoke detectors have batteries?
Most have a backup battery, so they still work during a power outage. Some newer models have a sealed 10-year battery.
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Need an electrician you can trust?
Tell us about the job. We call you back, explain the work in plain words and set a time.