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all questions you asked can be answered by an architect. how much it will cost for site visit I don't know. you will have to do some cold calls to architect firms to find out. floor plan is needed if you need to do the works. it can be bought from BCA. my house plans were from 1958 and are old hand drawn plans which BCA scan into pdf format. just pay $ can buy. but only owner or owner's authorised person can buy from BCA. if you already have a ramp, why don't keep it. it would be better than having to walk up steps especially if you are planning to stay in there till you get old. I think what you have is a single storey house with an attic instead of a 2 storey house. if the existing house is declared as a single storey with attic, then you will need to do a reconstruction to add a full level. but I may be wrong on this so get an architect to advise you on this. if you want, share the location of the house and can see more from google street view of the house.

Go to URA Site, scroll to click on "Launch" beside "URA Space" In "URA Space" go to "Control Plan" menu to check" 1) "Landed Housing Area Plan" to see your estate area's maximum building storey & type. 2) "Building Height Plan" which shows AMSL (short for Above Mean Sea Level) There are also other infor that you can check