Enabling works carried out in advance of the main construction phase may themselves impact on archaeological remains and this impact should be considered during the design stage of the development. This may include the demolition of existing structures, removal of existing foundations and other below ground obstructions, ground reduction, construction of haul roads or ramps and site drainage works. Decision making authorities will require that the impact on archaeology from enabling works is assessed, reduced as far as possible and that, where unavoidable, the impact is mitigated by excavation or archaeological watching brief.
Archaeological work may take place before or during demolition or enabling works, and in most cases it is desirable for archaeological work to be carried out in advance of the main construction phase.
For details of health and safety requirements see Handbook.