the impian houses experienced the sinking problem is true. it happened since day 1 and it is improving right now. i guess the soil settlement is going to reach its steady state. i did check and look at the underneath foundation of the house, so basically the house structure is OK, but you can easily see cracks at the car pouch and backyard (5ft area). this is due to they just built on the earth itself and no foundation to support.
and this can be fixed by having the piling works done before renovation and extension. i get a quote early this year that piling+ backyard extension (2 floors) = rm20000

however this plan might stop for my impian house due to I just got an new unit from BRR...