Metropolitan Fire Brigade administration staff involved in one of 2013's more novel industrial actions - which included working with the caps lock on, parking in managers' car spots, and eating lunch in managers' offices - have won pay rises averaging 21 per cent over the next three years.

The pay deal was signed off by outgoing fire chief Nick Easy and came into effect on Christmas Day.

It will see office staff at the fire brigade paid the same as their Country Fire Authority counterparts for the first time.

Along with the pay rises and back pay from the time their last workplace agreement ran out, staff will also get a $1500 sign-on bonus.

The pay rises far exceed the Napthine government's decree that no public sector workers be granted an increase in excess of 2.5 per cent a year unless productivity measures are delivered.