As Alax Gardiner said to me, £1.00 a window, double it and cross your fingers and hope you DONT get it.
Hospitals can be a night mare, we do a small one and it is an health and safety nightmare, also you have to wait around a lot if you are doing inside as well, so that has to be factored in.
Also there is a lot of bugs in hospitals, so wear gloves if poss and wash before eating yuk !!!
As for documents you have to have very comprehensive risk assessments, a generic one is hardly any use at all.
£5 million minimum insurance
proof you can undertake such a big contract, ie references for other big jobs
Environmental policy statements etc ete etc.
Everything you need should be in the tender document.