London’s permit scheme, which covers roads managed by Transport for London and the boroughs, allows conditions to be set on when and how works can be carried out in order to reduce disruption to road users.
Firms who carry out work without a permit face a maximum penalty of £500 while those who breach the terms of their permit can be fined up to £120.
Responding to a question from London Assembly member Caroline Pidgeon, Mr Johnson said the current penalties are “too low” to deter bad behaviour.
The Mayor added that he’s raised concerns over the level of the fines with the Secretary of State for Transport whose backing would be needed to increase the sums charged.
His office declined to say how much the Mayor thought the fines should increase by.
