The cost of construction depends majorly on the following factors:

1.Architectural Design opted (like Open Top, Sloped Roofs, terraces with add-on features etc.,)
2.Structural Design (depends upon type of strata available for foundation and numbers of floors / configurations (basement, stilt,G+2 etc.)
3.Specification of Building materials selected (Quality/Brand of materials used for painting, flooring, woodwork, Bathroom, Electrical etc.)
4.Exterior Finish chosen (i.e. front elevation design, stone cladding, facade, etc.)
5.Peripheral external developments (such as compound wall, driveway, landscape, hardscape, Gate etc,).
The other minor cost head would be cost of liaison, charges for construction permits & building approvals.
The Construction cost can be broadly split into Labor and Material Cost.