Depending on the amount of time and the number of projects and UE versions, you will get also an increased consumption of space for the shaders being compiled (called DerivedDataCache). Last time I have checked I got 100GB just for these and they are located usually at: “c: \users\your user\AppData\Local\UnrealEngine\Common\DerivedDataCache” but you can configure it to be somewhere else.
PS: Note that this depends on how long your are using the engine and the amount of materials compiled, it only grows.