The statement said that Woolley would be available to "advise local government and the property sector clients on all aspects of CIL, its governance arrangements, and the wider implications of CIL on the practical delivery of development and infrastructure".
Woolley has been the Department for Communities and Local Government’s CIL team leader for the last four years.
Planning revealed in January that Woolley was to leave the DCLG as part of a restructure of its CIL team. At the time a spokeswoman for the department said that a "small team" would remain in place at the DCLG "to support implementation".
Roger Tym & Partners chairman Keith Mitchell said: "Steve reinforces the firm’s leading advisory role on CIL and we are really pleased that he is adding his skills and experience to our team.
"We believe that it will not be very long before the current rush to set up CIL charges will be followed by the need to show real delivery of development and infrastructure."
Roger Tym & Partners is part of Peter Brett Associates.