Schools inspectorate Estyn is urging local authorities to cut the number of empty places in classrooms, saying that money is being wasted.
It says no local authority is achieving the government's targets of no more than 10% surplus and the number of unfilled places has gone up in the last five years
Despite the removal of some surplus places, local authorities have been slow to identify and complete projects which could lead to significant savings.
More work needs to be carried out by local authorities and the Welsh Government to assess the financial and education impact of previous school rationalisation schemes .
More top news
Western areas will see the wet and windy stuff continue overnight! And then tomorrow - i'm very sorry to say - there is more of it to come!
Dolaucothi Gold Mines is among five locations battling it out to be crowned Wales' best place in this year's Special Places competition.
It's the latest in a series of incidents, despite safety measures being put in place after the death of an off-duty police officer in March.