Smoke alarms are one of the cheapest items on any pre-sale checklist, and one of the easiest for a buyer’s inspector to flag. Maryland has specific rules about the type and age of alarms, and the state’s property disclosure form asks about them directly. A few inexpensive replacements can take an item off the inspection report and, more importantly, make the house safer for whoever lives there next.
I’m Evan Weissman. I buy houses across Maryland and see a lot of yellowed, 20-year-old alarms hanging from ceilings, or missing entirely. Here’s a plain summary of the rules from official sources and how they connect to selling.
The smoke alarm basics
Maryland’s smoke alarm requirements are in Title 9 of the Public Safety Article. The State Fire Marshal summarizes the key points for homes (Office of the State Fire Marshal):
- Alarms must be on every level of the home and in every sleeping area.
- Any alarm, hard-wired or battery-only, must be replaced 10 years after its manufacture date.
- Battery-only alarms must be replaced with units that have 10-year, sealed, non-removable batteries.
Baltimore County’s fire marshal page adds that the law took effect January 1, 2018, that a hard-wired alarm must be replaced with another hard-wired alarm, and that if you can’t find a manufacture date on the back of an alarm, it needs to be replaced (Baltimore County smoke alarm law). If the house is in 21222 or 21219 and you’re dealing with smoke and CO alarm rules, see how I buy houses in Dundalk.
How the age of the house matters
Under Public Safety section 9-104, the type of alarm required depends partly on when the house was built. Homes constructed before July 1, 1975 may use battery-operated alarms. Newer homes generally need alarms powered by household current with battery backup. Where battery-only alarms are allowed, they must be sealed, tamper-resistant units with a hush button and long-life batteries.
If you’re not sure what your house needs, call your local fire marshal’s office. Many will explain the rules over the phone.
Carbon monoxide alarms
Carbon monoxide rules are in Title 12, Subtitle 11 of the Public Safety Article. Under section 12-1102, the state requirement applies to:
- Newly constructed dwellings that burn fossil fuel for heat, ventilation, hot water, or a clothes dryer, where the building permit was issued on or after January 1, 2008.
- Hotels, rooming houses, and rental dwelling units.
For covered homes, section 12-1104 requires a carbon monoxide alarm in a central location outside each sleeping area. Rental units need one outside each sleeping area and on every level, including the basement.
Even if your older owner-occupied house isn’t covered by the state requirement, a CO alarm near bedrooms is cheap protection if you have gas heat, a gas water heater, a fireplace, or an attached garage. Some counties have their own rules, so check locally.
Where alarms show up on the disclosure form
Maryland’s property disclosure and disclaimer form asks about alarms in two places. One question asks whether the smoke alarms comply with Title 9 of the Public Safety Article, whether they’ll sound during a power outage, whether any are more than 10 years old, and whether battery-operated units are the sealed, tamper-resistant, long-life type with a hush button. Another asks whether a carbon monoxide alarm is installed if the property relies on fossil fuel for heat, ventilation, hot water, a clothes dryer, or other purposes.
Answer from what you know. If you’ve just replaced the alarms, say so and keep the receipt.
Selling a rental
Landlords have additional obligations. Under section 9-104, alarm placement may need to be upgraded when there’s a change of tenant and the unit hasn’t been equipped with qualifying sealed long-life battery alarms within the previous 10 years. Rental units also fall under the CO alarm requirement. If you’re selling a rental, my landlord guide to selling with tenants covers other compliance items buyers will ask about.
A simple pre-sale alarm check
- Walk every level, including the basement, and every bedroom.
- Look at the back of each alarm for the manufacture date.
- Replace anything older than 10 years or without a date.
- Replace battery-only alarms with sealed 10-year units.
- Replace hard-wired alarms only with hard-wired units.
- Add CO alarms outside sleeping areas if you have fuel-burning appliances or an attached garage.
- Test everything.
Most homeowners can do this in an afternoon. If the wiring is old or alarms are interconnected, an electrician can help.
Help for those who need it
The State Fire Marshal’s Get Alarmed Maryland program offers one free smoke alarm and one free CO alarm to qualifying homes that don’t already have them. Details and the request form are on the fire marshal’s site.
When you’re selling as is
If you’re selling to a cash buyer, outdated alarms usually won’t change the offer much, but disclose them honestly. Many buyers replace all alarms as part of their work anyway. My as-is selling page explains how I handle repairs like these.
Do I have to replace smoke alarms before selling my Maryland house?
Maryland’s law requires replacing alarms at 10 years and using sealed long-life batteries for battery-only units. Bringing alarms up to date before a sale is inexpensive and avoids an inspection item.
Are carbon monoxide alarms required in every Maryland home?
The state requirement covers newer fossil-fuel homes permitted on or after January 1, 2008, plus rentals and lodging. Local rules may add more. A CO alarm is sensible in any home with fuel-burning appliances.
Does the disclosure form ask about smoke alarms?
Yes. It asks whether the smoke alarms comply with state law, whether any are over 10 years old, and whether battery-only units are the sealed long-life type. A separate question asks about carbon monoxide alarms in homes that burn fossil fuel.
Can I replace a hard-wired smoke alarm with a battery one?
No. Under the 2018 rules, hard-wired alarms must be replaced with hard-wired alarms.
Talk through your situation
If you’re preparing a house for sale and want to know which small fixes are worth doing, call or text me at (410) 498-7473. I’m happy to share what I see buyers care about.