please i need serious assistance i have a project going on right now three bedroom flat i am presently building and the person in charge of the building just gave me a quotation of 946,876 naira for the roofing, and i have already done with the parapet only the roofing remaining and i have already sent him 600k from the amount and instructed him not to spend a dam from the money until i give the balance just want to be sure if the guy is not ripping me off because from his list,he quoted 75k only for workmanship and i have read from many post on nairaland that is something like 60k for workmanship.do you think 946,876k is fair enough to roof a 3bedroom flat with four toilets,one kitchen and dining? any useful info will be highly appreciated.

what type of materials is he using? what is the total area of the roof? what is the height of the roof? these are factors that will contribute to cost of the roof.