Hi, your budget for the renovations is how much? Im renovating my new 4 room flat too,yours is standard or premium flat?

You need to have patience to try around getting quotes. I suggest you can either take sample quotes from the forum here and list down what you want to be done then you give that list to the ID/Contractors eg wet works, hacking, hauling, carpentry. This way you can see if the quotation is cheap or expensive comparatively. Easier that way. There are plenty of sample quotes from others here. And in addition, if you want to do re-wiring I suggest you get a different electrician as those quotes from ID tend to be loads more ex.