Victoria has excluded builders LU Simon and Hickory Group from a new fast-track cladding rectification scheme, in a move that creates confusion about which companies can tender for work under the $600 million spend.

State Planning Minister Richard Wynne this week said the government would speed up the program initially slated to rectify combustible panels on 100 buildings a year, setting the new target of starting work on 400 buildings by the end of next year, the program's second year.