Consultation on the revisions to the CDM regulations ends on 29 July, with implementation pencilled in for October 2006.
But HSE head of construction policy Stephen Wright said that the vast majority of contributors to the HSE's website discussion forum were planning supervisors.
'Positions are very entrenched, and it will be difficult to move forward with a consensus view unless we get more input from contractors, ' Wright added.
Much of the controversy centres on proposals to replace the established role of planning supervisor with new 'co-ordinators'. These would work directly for the client with the client's authority behind them. They would be responsible for checking buildability and maintainability as well as health and safety proposals, all before work starts on site.
'There are acknowledged limitations to the planning supervisor role, and we believe good planning supervisors would find the proposed co-ordinator role more fulfilling, ' Wright said.