When it introduced its bill, the Scottish Executive said the cost of implementing an antisocial behaviour order would be between 500 and 6,500, but Cosla's corporate adviser, Margarita Morrison, said local authorities are actually paying between 5,000 and 20,000.
The figures were revealed at a meeting of the Scottish Parliament's Finance Committee, which is scrutinising the financial impact of the measures, and prompted MSPs to call for further information.
At the same meeting, the Scottish Children's Reporter Administration told MSPs the measures would increase costs by 200,000 and up the workload of the children's hearings system by one per cent.
The bill, which is largely the same as its English and Welsh equivalent, is expected to become law in June. YouthLink Scotland is planning to push for amendments in the New Year that would place a greater emphasis on the provision of preventive and support work for young offenders.
