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Interconnected smoke alarms in homes
New Zealand’s domestic smoke alarm rules
As of 2 November 2024, all building consent applications for new houses, sleepouts, and major alterations to existing houses must include interconnected smoke alarms installed in accordance with NZS 4514:2021.
What are they?
These alarms are linked so that if one detects smoke or fire, all alarms in the home will sound, providing early warning throughout the house.
Where must they be installed?
- In all bedrooms, living areas, hallways, and landings
- Multi-level homes require at least one smoke alarm on each level
- Where kitchens are separated by closable doors, a heat alarm (suitable for kitchens) must be installed
- Alarms must be placed within 10m of each other in any direction, and within 5m of any wall
What types can be used?
- Interconnected alarms that are either:
- Battery powered (minimum 10-year, non-removable, sealed battery), or
- Hard-wired via mains power
- All alarms must include:
- A test function
- A hush feature to silence nuisance alarms
Note: Hard-wired alarm installation or replacement must be carried out by a licensed electrician.
Heat Alarms & Heat Detectors
Heat alarms can be used in areas where smoke alarms are prone to false alerts—such as enclosed kitchens, laundries, or garages. They should not replace smoke alarms, as they do not detect smoke, but can be interconnected with smoke alarms to ensure the alarm is heard throughout the home.
Maintenance Tips
- Vacuum regularly to reduce dust build-up
- Test monthly using the test button
- Use an incense stick annually to check smoke detection
- Replace battery-powered smoke alarms every 10 years