Noise source Time restrictions for using noisy equipment at a residential premises where they can be heard in the living area of neighbouring properties
Power tools, swimming pool pumps, lawn mowers, leaf blowers and chain saws 8pm to 7am Monday to Saturday. 8pm to 8am Sundays and public holidays.
Musical instruments, radios, sound systems, and public address systems 10pm to 8am Sunday to Thursday. 12 midnight to 8am Friday, Saturday and any day immediately before a public holiday.
Air-conditioners and hot water heaters 10pm until 7am Monday to Friday. 10pm until 8am Saturday, Sunday and public holidays.
Motor vehicles (except when entering or leaving premises) 8pm to 7am Monday to Friday. 8pm to 8am Saturday, Sunday and public holidays.
Refrigeration units fitted to motor vehicles 8pm to 7am Monday to Friday. 8pm to 8am Saturday, Sunday and public holidays.

Source https://www.cityofsydney.nsw.gov.au/report-issue/resolve-neighbourhood-noise-issues