For residential build, how much would be the difference in per square meter cost between:

Bungalow
2-storey
3-storey

This will help determine whether to get more land and build a bungalow or a 2-storey on a smaller lot ... say the difference is 10T per square meter ... so it would be better to get a 1000 square meter and build bungalow house rather than 2-storey on 500 square meter lot ...