New South Wales Premier Barry O'Farrell has proposed new laws which will give police greater powers to search people for guns without a warrant.

The changes are to be introduced to Parliament this week and mean police would not need a warrant to search people who have been banned from owning weapons.

Their cars, homes and outlaw motorcycle gang club houses will also be able to be searched without a warrant.

Mr O'Farrell also plans to increase the prison term for anyone convicted of possessing or supplying guns to try to crack down on crime in Sydney.

The jail term will increase from 10 to 14 years.

The Government says there are about 60 people who have been issued with firearm bans and he predicts the number will rise as police place a greater focus on gun crime.

"Police will be able to stop and search them in their cars, in their homes, in their workplace, frankly there'll be no place for them to hide," he said.

"Clearly these laws are about dealing with gun crime across Sydney, police are concerned about the activities of outlaw motor cycle gangs and others and these laws will ensure that disorderly houses or crime dens can also be searched."

Labor has put forward similar proposals in the past, which suggests there could bipartisan support for the changes.

But civil libertarians have condemned the idea, arguing it erodes police accountability.

New South Wales Council for Civil Liberties president Cameron Murphy says a warrant provides legitimacy.

"What a search warrant does is confines the police's activities, so we know why they're searching, and ensures there's a legitimate reason for them to do so," he said.

"By removing that level of accountability, all we do is set up the scene in the future for perhaps police corruption, because there's no accountability over their actions."