What are the smoke detector requirements?
In general, the requirements for smoke detectors vary depending on when the residence was constructed. For example, some residences may require battery-powered detectors, others might need interconnected hard-wired detectors only or a combination of both. Others might need interconnected hard-wired detectors with battery backup. On April 5, 2010, a significant change in the Massachusetts’ smoke detector requirements will become effective for all residences subject to MGL c. 148, s. 26F upon sale or transfer. Now, all smoke detectors installed within 20 feet of kitchens or bathrooms (containing a bathtub or shower) will be required to be photoelectric detectors. The risk of nuisance alarms from steam and cooking is lower with photoelectric only detectors. All installed smoke detectors outside of 20 feet of kitchens or bathrooms (containing a bathtub or shower) must utilize either:
  • A dual detector (containing both ionization and photoelectric technologies); or
  • Two separate detectors (one photoelectric and one ionization).
Note: In residences not subject to MGL c. 148, s. 26F (built after January 1975), the smoke detector upgrade is recommended, but is not required by law.

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1. What are the smoke detector requirements?
2. What is the difference between ionization and photoelectric technologies?
3. What are the carbon monoxide alarm requirements?
4. What is fossil fuel burning equipment?
5. How will I know what I need?
6. What are the requirements if your 1 or 2 family house was built before January 1, 1975?
7. What are the requirements if your 1 or 2 family house was built between 1975 and August 27, 1997?
8. What are the requirements if your 1 and 2 family house was built after August 27, 1997?
9. What are the requirements if your 1 and 2 family house was built on or after January 1, 2008?
10. How will I get a certificate of compliance?
11. How do I know which kind of smoke detector I have?
12. Can I still have ionization smoke detectors if I am not selling or transferring my home?
13. Are combination carbon monoxide smoke detectors permitted?
14. Are there other recommendations?