Building construction means any physical activity on the site involved in the erection of a structure, cladding, external finish, form work, fixture, fitting of service installation and the unloading of plant, machinery, materials.

Cost Estimation is a statement that gives the value of the cost incurred in the manufacturing of finished goods. Cost estimation helps in fixing the selling price of the final product after charging appropriate overheads and allowing a certain margin for profits. 

Plans and elevations are a way of representing a 3-dimensional object. We have three views of the 3D shape: From the front of the shape, called the front elevation. From the side of the shape, called side elevation. From above looking down on the shape, called the plan view.