One- or two storey is strictly an individual choice, and the difference in cost (if any) depends on the design. A one storey house is however mostly cheaper.
Two storey homes might be your only option when land costs are high. Another advantage of a 2-storey can be that you can have a panoramic view and of course more fresh air and privacy.
Senior citizen however find it hard to live on the 2nd floor. Stairs are also expensive and occupy some floor area. You might need a pump and tank to supply water to the upper floor. The weight of the second floor requires a bigger foundation and a more complicated 2nd floor structural framing system; hence higher cost. But on the other hand, the roof on a two storey home is relatively smaller so the overall price-difference between a similar 1 storey and 2 storey house depends on too many factors to tell without knowing the design-details.
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