​Writing a risk assessment

​You are to create a risk assessment for the installation of a first floor bathroom in a domestic house.
The job entails the removal of the existing bathroom comprising of a bath, wash hand basin and W.C, and all related hot and cold pipework and waste pipework. The existing hot and cold pipework is copper and the waste pipework is lead. The existing pipework is installed below the floorboards and must be renewed from where it enters the room, the waste pipework is installed again under the floorboards and exits the building through the outside wall where it is connected to an external soil and vent pipe. You are to re-install the pipework (Materials of your choice) and new appliances (Bath, wash hand basin & W.C.)