I don't think most couples can pay off the mortgage for a 3 room
flat in 2 years or even 5 years and if they intend to upgrade when
children come into the picture, they might as well get a bigger
flat. I don't think they will save much on utilities rebates and
SC&C charges when they cost in the moving cost, renovations,
time invested (opportunity costs) etc when you shift into a new
flat.
The trend I see from my friends is that they get a 4 room or 5 room
flat. One room is converted into a study and an empty spare room
for future use when they have kids. This is what I did as well.
Anyway in my opinion a 3 room flat is way too small
Not enough space for me 