Managing noise from intruder alarms

Under the Protection of the Environment Operations (Noise Control) Regulation 2026 (the Regulation), it is an offence for an intruder alarm to sound for more than:

• 45 seconds for cars manufactured on or after 1 September 1997 
• 90 seconds for older cars.

Owners of vehicles manufactured before 1 March 2009 can claim a defence if:

• a vehicle window or windscreen was broken or removed
• the motor vehicle was involved in an accident
• the motor vehicle was broken into or an attempt was made to break into it.

It is an offence for a building alarm to be audible in any neighbouring residence when it sounds for more than:

• 5 minutes if installed on or after 1 December 1997
• 10 minutes if installed before 1 December 1997.

It does not matter if:

• the alarm sounds because of a break-in or because it is faulty
• the alarm sounds continuously or intermittently, for the purpose of measuring the time during which it sounds.

The owner or operator of a vehicle or the occupier of a building is responsible for the alarm system and could be fined if it sounds for longer than the allowed time.

When a child presence detection (CPD) alarm is sounded

The Regulation exempts noise triggered by the CPD alarm. A child presence detection alarm is ‘a sound emitted from a device, that is attached to or forms part of a motor vehicle, when a child or animal has been left inside the motor vehicle while the motor vehicle is not in use’. CPD systems are an important safety device and are predicted to be increasingly fitted to Australian motor vehicles as the technology improves.

• Purchase a good quality alarm.
• Ensure that detailed instructions are provided about operation and maintenance of the alarm system.
• Test the alarm soon after purchase to ensure that it complies with the specified time limits.
• Check that the system and installation are covered by warranty.
• Follow the instructions about proper system maintenance, ensuring that the alarm is properly maintained. This is particularly important when the vehicle or building is left unattended for long periods.
• Check the proper procedures for disarming and setting the alarm so that it does not sound unnecessarily.

The alarm system should be installed according to the relevant Australian Standard.

Building intruder alarms​ should be installed in accordance with AS2201.1 – 2007, Intruder Alarm Systems – Client’s Premises-Design, Installation, Commissioning and Maintenance. Ask to see the installer’s security licence to ensure they are experienced in installing your type of system. For more information about security licences, see the NSW Police Force's security industry register or contact the Police Assistance Line on 131 444.

Vehicle intruder alarms​ should be installed in accordance with AS/NZS 3749.2-1997: Intruder Alarm Systems - Road Vehicles - Installation and Maintenance. Check that the installer is experienced in installing your type of system. This information should be available on the installer's website.

Once the alarm system is properly installed, to keep it working properly:

• use and maintain the alarm in accordance with the instructions
• avoid altering any adjustments or sensitivity settings
• for 'back to base' systems, arrange with the alarm company to control extended sounding
• if possible, advise the council and the police of a contact person who can enter the premises to turn off a faulty alarm when you are absent.

The National Motor Vehicle Theft Reduction Council and the NRMA recommend an electronic engine immobiliser​ as the best deterrent against car thieves. Immobilisers are not noisy, and are standard equipment on all passenger vehicles manufactured since July 2001.

Satellite tracking systems​ are also available.

For buildings, continuously monitored 'back to base' alarm systems​ have features such as:

• an alarm that sounds in the house to deter intruders without disturbing the neighbourhood
• a telephone connection to a customer care centre to ensure a prompt response to an emergency.

Your insurance or security contractor can provide more information about systems not based on audible alarms and the best solution for vehicles and homes.

Contact the police to find out if theft is the cause of the alarm. Phone the Police Assistance Line on 131 444 or your local police station. Police officers are not authorised to enter unoccupied premises to stop faulty alarms sounding or enter vehicles to disable car alarms, but they can accompany authorised council officers. Council officers can enter an unoccupied business premises but require a warrant to enter an unoccupied residential building.

Check with your local police or council about any established response procedures they have to address the prolonged sounding of alarms.