UE 4.5 Taking Up Lot of HDD Space

Hi all,

My UE4.5 folder on Windows is taking up 35.3 GB of space on my hard drive! I had just built the Vehicle Game project and the Intermediate folder inside the Engine folder of UE itself is 15 GB. Before the build I probably had around 20-30 Gb free space in my hard disk but now I have only 8 GBs of space left, after deleting the Debug Intermediate build files. Is it ok if I delete the Development Files also? I already have all the binaries under Engine/Binaries. Thanks!

Never mind, I deleted it and nothing happened. But still, the UE folder takes about 20 GB space. Any tips on how to reduce that? I have both Engine binaries and source.