I have been working with the NEC3 for about 7 years now and only now am I working on my first project where a Working Area Overhead percentage is being used. There seems to be remarkably few posts on this topic and I wonder if someone has some advice or knows of a reputable publication which clarifies what items of cost should be included within the percentage. The Schedule of Cost Components states:
"The charge includes provision and use of equipment, supplies and services, but excludes accommodation, for
Catering, medical facilities and first aid, recreation, sanitation, security, copying, telephone etc, surveying and setting out. computing and hand tools not powered by compressed air"
On first read this seems quite straight forward but when I consider such things as fencing, engineers, cleaning, water, sewage disposal etc it becomes more complicated.
Is site fencing classed as security if it protects only against theft?
Does the regular emptying of a cess pit constitute a charge under ‘Charges’ or does it fall under sanitation?
While surveying and setting out are Engineers providing services or are they paid for under People (time spent working on site)?
Are cleaners considered under people or WAO percentage?
Your assistance would be appreciated.