Daylight saving will officially end at 3am Sunday meaning clocks should be put back an hour.

Coinciding with the time change the Orange branch of Fire and Rescue NSW is urging people to also check their smoke alarms and change smoke alarm batteries.

Orange station commander, station officer Dane Philippe said the weekend is a good opportunity to ensure smoke alarms are working and replace those which are older than 10 years old.

"As smoke alarms can be affected by dust, insects, humidity and age, they need to be replaced every 10 years," Mr Philippe said.

"Fire and Rescue NSW also recommends that you replace lead or alkaline batteries in smoke alarms every 12 months and test your smoke alarm batteries every month by pressing and holding the test button for at least five seconds until you hear the beeps."

In NSW, at least one working smoke alarm must be installed on each level of a home. This includes rental properties, relocatable homes, caravans and camper-vans or any other residential building where people sleep.

Station officer Philippe said in addition to the minimum legal requirement of one smoke alarm per level, Fire and Rescue NSW strongly recommends installing smoke alarms in all rooms where people sleep and the hallways leading to sleeping areas.

"Ideally you should have the smoke alarms hard wired (connected to the electrical wiring) and interconnected, so that if one activates they will all sound an alarm," he said.

"Having working smoke alarms installed on every level of your home dramatically increases your chances of survival in the event of a fire.

"A fire can take hold in just three minutes, filling your home with deadly smoke. A working smoke alarm gives you vital seconds to get out before you're overcome."