Do Maryland short-term rentals need interconnected smoke and CO alarms?
Quick answer
Yes, if more than one smoke alarm is required. Since October 1, 2026, Maryland short-term rentals must have working smoke and carbon monoxide alarms; multiple smoke alarms must be interconnected so one sets off all (or meet a State Fire Marshal alternative), must be audible in all sleeping rooms with doors closed, and must be replaced if they stop working, are over 10 years old, or have no production date (Public Safety 9-1103(b)).
Key facts and official sources
| Item | What the law says | Source |
|---|---|---|
| Law | Md. Code, Public Safety 9-1103(a)(4) and (b) | Official source |
| Effective | October 1, 2026 | Official source |
| Installation | Installed and maintained under State, county and municipal fire codes | Official source |
| Interconnection | If multiple smoke alarms are required, activation of one must activate all, or meet a State Fire Marshal alternative | Official source |
| Audibility | Clearly audible in all sleeping rooms and areas, over background noise, with doors closed | Official source |
| Replacement | Replace if not working, more than 10 years old by the production date on the back, or no production date | Official source |
| Last verified | October 17, 2026 | Astor Ventures |
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FAQ
How many smoke alarms does a Maryland short-term rental need?
The number comes from State, county and municipal fire codes, not from 9-1103 itself. The law says alarms must be installed and maintained under those codes.
Does the 10-year rule apply to carbon monoxide alarms too?
Yes. 9-1103(b)(4) applies the replacement rule to smoke alarms and carbon monoxide alarms.
What else must a Maryland host provide?
A posted evacuation diagram, posted emergency telephone numbers for police and fire rescue, and a working fire extinguisher (9-1103(a)).
Is this legal advice?
No. General information only.
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