Building Commission Industry Bulletin 86 - Smoke alarms installed in additions or alterations to existing dwellings

Scheduled system outage

AssociationsOnline, BondsOnline and Licence renewals will be unavailable from 5pm on Friday, 23 February until 8am on Monday, 26 February to allow for scheduled system improvements. We apologise for any inconvenience this may cause.

Information status

All documents issued prior to 1 July 2017 were issued by the former Department of Commerce. Documents listed here are the latest versions available, but may be subject to review. For more information on this document, please contact

This Industry Bulletin outlines interconnection requirements for mains-powered smoke alarms installed as part of new building work, such as an addition or alteration, to existing dwellings. This information applies to the following residential dwellings as classified under the Building Code of Australia (BCA):
  • a Class 1a building (e.g. house, town house, villa etc);
  • a Class 1b building (e.g. small guest house, boarding house – less than 12 residents. Can also be four or more single dwellings, such as chalets, located on one allotment for short term holiday accommodation);
  • a sole-occupancy unit in a Class 2 or 3 building; (e.g. apartment, flat or unit); and
  • a Class 4 part of a building (e.g. a caretaker’s residence).
The requirements will depend on whether the original dwelling had its building permit application submitted before 1 May 2015 or on or after 1 May 2015.
Building Commission
Last updated 12 May 2017

Share this page:

Last modified: