My issue is quite complicated. I bought a resale flat and the living room was tiled while the bedrooms were screeded originally. So the ID hack the living room and screeded it but they din do a good job as the floor was uneven.
The flooring supplier installed a rigid kind of flooring similar to laminate and SPC over the living rooms and bedrooms but turns out their flooring was defective as the joints would break after some time. So they offered to change all the flooring and top up some low points with a compound. I did not want to do self level as it will raise the height of the flooring, causing it to be slightly higher den the kitchen which is tiled. So they process fo remove the old flooring, and manage to remove flooring under the cabinets without damage also and put in new flooring.
However after the new flooring was put in, I still can feel the unevenness of the floor though it was better so I am really thinking of self levelling and change to vinyl as vinyl is thinner and the difference in thickness of vinyl and my current flooring can be covered by the self levelling.
So far I spoke to a reputable vinyl supplier, can self level 1 to 3mm for around $500 for living room and once sub floor is flat, can install vinyl of around 4.5 mm or 5mm without a underlay. It will take 2 days as need to wait one day for the self levelling compound to dry and check the moisture content before laying the new vinyl.