Yes Jumping from the ground to a roof can be but 1. I didn't say you should be able to. 2. That is completely dependent on the the height of the roof. Ex. a shack?. That is a good point, I didn't even remember there is going to be sprint. Though if the rumors about attributes not being implemented turns out true, what would then govern your speed? (Though it is just rumor or hear-say at this-point-in-time). I myself don't really care either way. Would you oblige that if it is, that athletics would probably govern your speed?
True, if Attributes are out (I hope not), then Athletics could somehow govern run speed. Maybe just make sprint speed directly dependent on movement speed and make so movement speed and sprint duration are governed by Athletics. And although jumping onto a building would be determined by roof height if you can enter it without ducking you probably wouldn't be able to jump on it lol. I'm no professional athlete but on doing a regular jump (not any of the Olympic high jump nonsense where it is ok to land on your spine because there is a big fluffy pad) I can get anywhere from 3 feet to just under 4 feet if I get lucky.
Fun fact, the record for the highest jump kick is 9 ft, 3 inches according to my research (comprised of a quick google search lol). But that jump involved running, a back hand spring and was actually a backflip kick. This means that his head still only got about 4 feet off the ground.
In my opinion, there should be a realistic cap on jump height up through level 100, maybe something like 5-6 feet. After that (when you need to use potions and spells to surpass human limits) it can go crazy high.