New property owners will pay 25 per cent extra for application fees to register land and property as the NSW government prepares the public asset for sale.

NSW Labor said the price increase would provide a windfall of up to $27 million to whoever buys the Land and Property Information Service which generates more than $60 million in a year.

The new application fees for title registrations and the determination of title boundaries will rise from $109.50 to $136.30.

Treasurer Gladys Berejiklian recently confirmed the government's in-house land agency would be privatised.

Labor's spokesman for Finance, Services and Property Clayton Barr said new application fees for title registrations and the determination of title boundaries will rise from $109.50 to $136.30 for each transaction – an increase of almost $27. He said the price increase was released in a government circular but not highlighted by the government.