Eli5 why aren’t 2 story houses built with ramps instead of stairs?

Question

Are they just not practical? They seems cheaper to build instead of elevators for wheelchair bound people.

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Answer 1

For the slope to be gentle enough that you could climb it comfortably without rolling backwards or falling if it is slippery, it would have to occupy a large area. A maximum steepness ramp has a slope ratio of 1:12. To climb 3 meters you’d have to allocate 36 meters or 18 meters in a U shape of length. Public buildings could have a higher ceiling than 2.5 meters. Perhaps a shopping mall or a train station could have enough room for that, but not a house.