# Smoke and CO Detectors in Cherry Hill, VA | Electric Sandro

Page: https://electricsandro.com/areas/cherry-hill/smoke-and-co-detectors/
Business: Electric Sandro | (571) 402-2540 | Quantico, VA
Updated: 2026-11-10

[Home](/) / [Cherry Hill, VA](/areas/cherry-hill/) / Smoke & CO Detectors

# Smoke and CO Detector Installation in Cherry Hill, VA

About 2 in 3 Cherry Hill homes were built before 2010, so any smoke alarm still there from the build is past the 10-year replacement date NFPA sets. Prince William County Fire and Rescue says every home needs a working alarm on each level and in or near each bedroom, and in rentals, which are about 38% of Cherry Hill homes, the landlord provides them.

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## Smoke & CO Detectors in Cherry Hill: the facts

Replacement rule

[Replace smoke alarms 10 years after the date on the back (NFPA)](https://nfpa.org/education-and-research/home-fire-safety/smoke-alarms)

Homes built before 2010

[About 68% of Cherry Hill homes (5,778 of 8,531, Census ACS 2020-2024)](https://censusreporter.org/profiles/16000US5115176-cherry-hill-va/)

County smoke alarm placement

[On each level of the home and in or near each bedroom; landlords provide alarms in rentals](https://www.pwcva.gov/department/fire-rescue/community-safety-programs)

County CO alarm placement

[Central spot outside each sleeping area and on every level; test monthly](https://www.pwcva.gov/department/fire-rescue/carbon-monoxide-poisoning)

Gas utility

[Washington Gas or Columbia Gas: Washington Gas says some Prince William County areas are served by Columbia Gas](https://www.washingtongas.com/services/contractors/service-territory)

Permit to replace alarms

[Unconfirmed: no county page names it; call Building Development at 703-792-6930](https://law.lis.virginia.gov/admincode/title13/agency5/chapter63/section80/)

Drive from our base

About 17 minutes (8.3 miles) from our base in Quantico, without traffic

## Are the smoke alarms in my Cherry Hill home past due?

Probably, unless someone already changed them. The [NFPA](https://nfpa.org/education-and-research/home-fire-safety/smoke-alarms) says to replace smoke alarms 10 years after the date printed on the back. Census data shows about 68% of Cherry Hill homes were built before 2010 ([Census ACS](https://censusreporter.org/profiles/16000US5115176-cherry-hill-va/)). That covers most of Southbridge and River Oaks, built from the mid 1990s to the mid 2000s, and Eagle Pointe from the late 2000s ([Wikipedia](https://en.wikipedia.org/wiki/Cherry_Hill,_Prince_William_County,_Virginia)).

Homes built from 2010 to about 2016 are reaching that date now. Pull one alarm down and read the date. If it is more than 10 years old, the whole linked set should be changed together, so they match and talk to each other.

Prince William County Fire and Rescue says each home should have a working alarm on each level and in or near each bedroom ([county safety programs](https://www.pwcva.gov/department/fire-rescue/community-safety-programs)). In a three-level townhouse, that is three alarms before you count the bedrooms.

## CO alarms, gas service and attached garages

Carbon monoxide comes from things that burn fuel. The county's [carbon monoxide page](https://www.pwcva.gov/department/fire-rescue/carbon-monoxide-poisoning) names natural gas, propane and oil equipment, and warns about running a car or generator in an attached garage, even with the door open. It says CO alarms go in a central spot outside each sleeping area and on every level, linked so that when one sounds, all sound. Test them each month.

If your home has gas service, check which company sends the bill. Washington Gas says some Prince William County areas are served by Columbia Gas instead ([Washington Gas](https://www.washingtongas.com/services/contractors/service-territory)). Either way, a home with any gas appliance or an attached garage should have CO alarms.

After a storm, run a portable generator outdoors only, away from doors, windows and vents, the county's [outage page](https://www.pwcva.gov/department/office-emergency-management/power-outages) says. Never in the garage.

## Renting in Cherry Hill, and the permit question

About 38% of occupied Cherry Hill homes are rented ([Census ACS](https://censusreporter.org/profiles/16000US5115176-cherry-hill-va/)). The county says landlords are responsible for providing smoke alarms in rental units. Renters with questions can call the county's fire and life safety outreach line at 703-792-7736. If you own a rental here, we can replace the full set between tenants.

Is a permit needed to replace hardwired alarms? No county page says, and smoke alarms are not on the state's list of exempt swaps in [USBC 108.2](https://law.lis.virginia.gov/admincode/title13/agency5/chapter63/section80/). Call Building Development at 703-792-6930 to confirm. Adding an alarm in a new spot means new wiring, which the county treats as new electrical work.

## 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](https://www.angi.com/articles/smoke-detector-installation-cost.htm), [HomeGuide](https://homeguide.com/costs/electrical-work-pricing-guide), [Fixr](https://www.fixr.com/costs/smoke-detector-installation), and prices published by one Northern Virginia electrician. Your price depends on your home, the parts and the permit fee.

[Try the Smoke and CO Detector Calculator](/tools/smoke-detector-calculator/)

## Permit rule here

Prince William County, checked 2026-11-07

Replace a smoke alarm

[Unconfirmed: call the office](https://law.lis.virginia.gov/admincode/title13/agency5/chapter63/section80/)

[All rules for Prince William County](/electrical-permit-checker/#prince-william-county)

## Smoke & CO Detectors questions in Cherry Hill

What Cherry Hill homeowners ask about smoke & co detectors.

![Zappy holding a smoke detector and a carbon monoxide detector](/brand/zappy/zappy-electric-sandro-mascot-smoke-co-detectors-300.webp)

How old are the smoke detectors in my Cherry Hill home?

Read the date on the back of one alarm. About 2 in 3 Cherry Hill homes were built before 2010, so original alarms are past NFPA's 10-year limit. Replace the full linked set at once.

Who replaces smoke alarms in a rented Cherry Hill townhouse?

The landlord. Prince William County Fire and Rescue says landlords provide smoke alarms in rental units. Renters can call the county outreach line at 703-792-7736 with questions.

Where do CO detectors go in a Prince William County home?

The county says in a central spot outside each sleeping area and on every level, linked so all sound together. Add them if you have gas, oil or propane appliances or an attached garage.

Do I need a permit to replace hardwired smoke detectors in Cherry Hill?

It is not confirmed. No county page names it, and the state's exempt list does not include smoke alarms. Call Building Development at 703-792-6930. New alarm locations need new wiring and are new electrical work.

[All electrical services in Cherry Hill](/areas/cherry-hill/) · [About our smoke & co detectors service](/services/smoke-and-co-detectors/)

## More in Cherry Hill

-   [Ceiling Fan Installation](/areas/cherry-hill/ceiling-fan-installation/)
-   [Commercial Electrical](/areas/cherry-hill/commercial-electrical/)
-   [EV Charger Installation](/areas/cherry-hill/ev-charger-installation/)
-   [Electrical Troubleshooting & Repair](/areas/cherry-hill/electrical-troubleshooting/)
-   [Outlets, Switches & GFCI](/areas/cherry-hill/outlets-and-switches/)
-   [Lighting Installation](/areas/cherry-hill/lighting-installation/)
-   [Electrical Panel Upgrades](/areas/cherry-hill/panel-upgrade/)
-   [Remodel Wiring & Rewiring](/areas/cherry-hill/remodel-and-rewiring/)
-   [Whole-House Surge Protection](/areas/cherry-hill/whole-house-surge-protection/)

## Smoke & CO Detectors nearby

-   [Dumfries](/areas/dumfries/smoke-and-co-detectors/)
-   [Leesylvania](/areas/leesylvania/smoke-and-co-detectors/)
-   [Montclair](/areas/montclair/smoke-and-co-detectors/)
-   [Potomac Mills](/areas/potomac-mills/smoke-and-co-detectors/)
-   [Triangle](/areas/triangle/smoke-and-co-detectors/)

**Sources** (checked 2026-11-07): [NFPA: Smoke alarms](https://nfpa.org/education-and-research/home-fire-safety/smoke-alarms) · [Prince William County Fire and Rescue: Community safety programs](https://www.pwcva.gov/department/fire-rescue/community-safety-programs) · [Prince William County Fire and Rescue: Carbon monoxide poisoning](https://www.pwcva.gov/department/fire-rescue/carbon-monoxide-poisoning) · [Prince William County: Power outages](https://www.pwcva.gov/department/office-emergency-management/power-outages) · [Washington Gas: Service territory](https://www.washingtongas.com/services/contractors/service-territory) · [Virginia USBC 13VAC5-63-80 (permits and exemptions)](https://law.lis.virginia.gov/admincode/title13/agency5/chapter63/section80/) · [Census Reporter: Cherry Hill CDP (ACS 2020-2024)](https://censusreporter.org/profiles/16000US5115176-cherry-hill-va/) · [Wikipedia: Cherry Hill, Prince William County, Virginia](https://en.wikipedia.org/wiki/Cherry_Hill,_Prince_William_County,_Virginia).

![Zappy, the Electric Sandro mascot, in a round badge](/brand/zappy/zappy-electric-sandro-mascot-icon-300.webp)

## About Electric Sandro

Electric Sandro is an expert electrician business with 20+ years of experience in the industry, based in Quantico, VA and serving homes and businesses across Northern Virginia. Mon-Fri 7:00 am - 5:00 pm. Emergency calls 24/7.

[About Sandro](/about/) · [Photos of our work](/our-work/) · [(571) 402-2540](tel:+15714022540)

Last updated November 7, 2026.

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## Smoke & CO Detectors in Cherry Hill?

Tell us about the job. We call you back, explain the work in plain words and set a time.

[Get a quote](/contact/#quote) [Call now](tel:+15714022540)

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