Our bid will be based on square footage, the pitch of roof (The higher the inclination is, the more it will cost), the height of the house (The higher the house is, the more it will cost) and the complicated conditions of the roof etc. (such as the alteration of the direction of skylights, chimneys or the whole roof) In simple terms, the simpler the roof is, the lower the price will be. The price also varies according to different types of roofing material opted for.