How many smoke detectors should a home have?

Author: Milton McDermott  |  Last update: Thursday, February 12, 2026

Today's new homes require by code a hardwired detector on each floor in addition to a detector in each bedroom. Older Homes do still need at least one smoke detector on each floor, including the basement. For maximum protection in these occupancies, we highly recommend one in each bedroom too.

Should you have a smoke detector in every room?

How many do I need? Smoke detectors should be placed outside each sleeping area and on every level of the home, including the basement. On floors without bedrooms, detectors should be installed in or near living areas such as dens, living rooms, or family rooms.

How many smoke detectors are required in a house?

How Many Smoke Detectors Do I Need? According to the United States Department of Homeland Security, and the California Building Code, at least one smoke detector needs to be placed in each of the following areas of your home: On Every Floor Level. In Every Bedroom.

Do you need CO detectors in every room?

Carbon monoxide alarms should be installed on every level of your house so all family members can hear the detectors and be alerted to the emergency. You should also have carbon monoxide detectors in every bedroom, sleeping area, and common room for extra safety while you and your family are sleeping.

How do you calculate the number of smoke detectors I need?

Calculating the Number of Detectors per Area
  1. Per Square Footage: Generally, one smoke detector is recommended for every 500-1,000 square feet of floor space. ...
  2. Per Floor: As a minimum standard, ensure at least one smoke detector per floor, including basements and attics, if they are used or accessible.

What Most Homeowners Don’t Know About Carbon Monoxide Detectors

What is the code for smoke detector locations?

For many years NFPA 72, National Fire Alarm and Signaling Code, has required as a minimum that smoke alarms be installed inside every sleep room (even for existing homes) in addition to requiring them outside each sleeping area and on every level of the home. (Additional smoke alarms are required for larger homes.)

How many carbon monoxide alarms do I need in a 3 bedroom house?

The International Association of Fire Chiefs recommends a carbon monoxide detector on every floor of your home, including the basement. A detector should be located within 10 feet of each bedroom door and there should be one near or over any attached garage. Each detector should be replaced every five to six years.

Where to put a carbon monoxide detector high or low?

Carbon monoxide is lighter than air. It also rises with warm air, so the United States Environmental Protection Agency (EPA) recommends placing a carbon monoxide detector on a wall about five feet above the floor or about eye level. You can put them on the ceiling, too.

How many smoke alarms do I need?

We recommend you have one smoke alarm in your hallway and one at the top of your stairs. You could also have smoke alarms in your bedrooms. In smoky or steamy rooms like your kitchen or bathroom, a heat alarm is more suitable.

What states require CO detectors?

Twenty-seven states and the District of Columbia require carbon monoxide detectors in private dwellings with a state statute: Alaska, California, Colorado, Connecticut, District of Columbia, Florida, Georgia (with adoption of the International Residential Code), Illinois, Iowa, Maine, Maryland, Massachusetts, Michigan, ...

Where should smoke alarms not be placed?

Avoid near fresh air vents, ceiling fans or very drafty areas (drafts can blow the smoke away from the detector/alarm). Avoid installing closer than 4 inches from the wall or corners.

Do first alert smoke detectors detect carbon monoxide?

First Alert's Precision Detection Advanced Sensing Technology. Voice & Location Alerts for Danger and Helps Escape Safely. Provides Reliable 2-in-1 Protection Against Both Smoke and Carbon Monoxide.

What to do if you have more than 12 smoke detectors?

Essentially, any hardwired alarm installation that requires more than 12 smoke alarms needs to have a complete residential fire system installed.

Should smoke detectors be on wall or ceiling?

Smoke, Fire & Gas Detection FAQs

The best location to install your smoke alarm is in the centre of the ceiling rather than on the wall. During a fire, smoke initially rises and then spreads horizontally. Placing the smoke alarm in the centre of your ceiling means that it is closest to all four points of your room.

How much does it cost to install a smoke detector?

Smoke detector installation costs $70 to $150 for most homeowners, and the average cost is $115. A pro can give you more specifics based on the number of smoke detectors you need, their quality, and where they're at in your home.

Can you sue a landlord for no smoke alarms?

In addition, California has laws requiring smoke detectors in certain residential facilities. If a landlord fails to follow the law, and a tenant is harmed, the tenant can sue for damages.

Can I install smoke alarms myself?

Yes, you can replace your fire alarm yourself if your existing alarm has an easi-fit base, which means there is no need to remove or re-wire the baseplate. Replacing fire alarms is an easy process that is safe to carry out by yourself.

Is covering a smoke detector illegal?

(WITHOUT TAMPERING WITH THEM OR COVERING THEM UP, which is illegal and could open you up to criminal liability should a fire occur, and we definitely don't want that)! So...

Do I need a carbon monoxide detector in every room?

Carbon monoxide detectors should be installed on every level of your home so all family members can hear the alarms and be alerted to the emergency. You should also have carbon monoxide detectors in every bedroom and outside each sleeping area.

What is the best carbon monoxide detector to buy?

Our Picks
  • Best carbon monoxide detector overall. First Alert CO615. View details. $36 at Amazon. View details.
  • Best carbon monoxide detector on a budget. First Alert CO400. View details. $14 at Amazon. View details.
  • Best smoke and carbon monoxide combo detector. First Alert Onelink 1042136. View details. $198 at Amazon. View details.

Are plug-in CO detectors effective?

Are Plug-in Carbon Monoxide Detectors Effective? Yes, plug-in monitors work just as well as battery-powered devices. The best plug-in carbon monoxide detector for your home is one with a battery backup. That way, you know your monitor will also work in case of a power outage.

How many smoke alarms should a house have?

In Bedrooms: Each bedroom should have its own detector to ensure that sleeping occupants can hear the fire alarm and respond quickly. Outside Sleeping Areas: Install detectors in hallways or common areas adjacent to bedrooms.

Do I need a carbon monoxide detector if there is no gas?

Do I need a carbon monoxide detector? Unless your house is all-electric (no gas appliances), the answer is yes. Carbon monoxide poisoning is often lethal and most homes have the potential for this tragedy.

Where is the best place to put a carbon monoxide detector?

The best place for a CO detector is on a wall roughly five feet from the floor, where it can measure the air at a height that people in the house are breathing it. A reasonable alternative is placing the detector on the ceiling and six inches from the wall.

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