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Smoke Alarms in NZ: What the Rules Require

Smoke alarms are the cheapest life-saving thing in your home — and there are rules about them, especially for rentals. Here's what you need and where.

Published 2026-06-01 · Whakatāne Electricians

Where smoke alarms are required

The healthy-homes and building rules require working smoke alarms within 3 metres of every bedroom door (or in each room where someone sleeps), and on each level of a multi-storey home. For rentals, landlords must provide compliant alarms and tenants must keep them working.

Photoelectric and long-life

Current standards call for photoelectric smoke alarms (better at detecting smouldering fires) with either a long-life 10-year battery or hard-wired. The old 9-volt-battery ionisation alarms are out of step with the rules.

Hard-wired vs battery

Long-life battery photoelectric alarms meet the rules and are easy to fit. Hard-wired interconnected alarms (where one alarm triggers them all) are the gold standard — when smoke is detected anywhere, every alarm sounds, giving everyone more time. We install and interconnect hard-wired alarms as part of wiring and renovation work.

How we can help

FAQ

Quick answers

How many smoke alarms do I legally need?

At least one working alarm within 3m of each bedroom door (or in each sleeping room) and on every level. Rentals must have compliant photoelectric alarms.

Should I get hard-wired or battery alarms?

Long-life battery photoelectric alarms meet the rules. Hard-wired interconnected alarms are safer because they all sound together — ideal during a build or rewire.

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