As per Vastu, Extension in the SE side of plot may bring legal problems, loss of wealth and mental tension in life
As per vastu, Plot's which have extended corner in the south east direction, brings legal litigation, fire accident and theft.
Extension in South side of South East side plot brings legal litigations and monetary loss.
Any extension other than north east corner will bring you some sort of problems. If no other way, we can correct with vaasthu energy materials to compensate the same.