Posted By William O'Donnell
I assume from the phrase 'substantial rebuilding' that the project falls within the CDM Regulations.
The Planning Superviser is responsible for preparing the pre-tender Health & Safety Plan, which is essentially a collection of information about the significant health and safety risks of the construction project which the Principal Contractor will have to manage during the construction phase.
The contents of the pre-tender Health & Safety Plan will depend on the nature of the project, however the following ares should be considered:
Nature of the project
The existing environment
Existing drawings
The design
Construction materials
Positioning of site access/egress, location of unloading, layout and storage areas, traffic routes, etc.
Overlap with the clients undertaking
Site rules, emergency procedures, permit to work, etc.

Further guidance is available, from the HSE, on the roles and duties under the CDM Regulations. Hope this helps.

Posted By Ken Taylor
In addition to your existing work, you will also have an interest in how the construction works will affect the health and safety of your undertaking and how the new buildings will affect it - particularly with regard to future cleaning and maintenance. In your position, I would: liaise with the appointed Planning Supervisor; get consulted in the preparation of the Pre-tender Health and Safety Plan; attend related meetings; exchange H&S information as needed; advise the employer on design issues affecting H&S; monitor the Principal Contractor's performance as it may affect the undertaking; etc. What you actually do will depend upon: your job description; what your employer asks you to do; what happens during the works; whether areas are ring-fenced to the Principal Contractor; whether there are shared working areas; etc. It can all help to make the job even more interesting.