How would you define good Architectural Planning based on cultural context in mega cities which space costs are so high?

Rapid urbanisation and mega cities are demanding the need for spatial information management. Due to high rise in land properties, architectural planning play an important role in developing a home fulfilling the family requirement in a much efficient and economical way. A way defined architectural plan would not only eradicate additional costing for rework but also give a satisfaction to the buyer in a great sense.