Extension and addition to plots

It is good to expand on an existing plot towards its northern side. However it should cover the entire north or north-east portion and not just the north-west only.

Addition to north-west is bad
Addition to north-east is very good
Addition to north is good
Addition to south-east is bad
Addition to east is good
Addition to south-west is very bad
Addition to north-west is bad
Addition to west is bad
Addition to south-east is bad
Addition to south-west is very bad
Addition to south is bad

Extension to south east corner is bad
Extension to south west is very bad
Extension to north west is bad
Extension to North east is very good.

rahu-ketu