The Baird government is facing growing resistance to its land titles registry privatisation plans, with historians and journalists expressing fear that higher costs will reduce their access to public information.

Already, because of recent fee hikes, it's estimated the NSW Police Force will have to pay $100,000 more this year to access Land and Property Information's (LPI) records.

Shadow Finance Minister Clayton Barr said based on LPI fee increases ahead of the lease, "there will be an increase from $30,000 to more than $130,000, just for LPI searches so the police can go about their job of catching criminals".

He said Independent Commission Against Corruption (ICAC) investigators will also face higher costs, with profits going to the private operator, not public services.