Standard modular meshes?

Hi everyone. I’m new here. I’m not sure if this has been asked (I haven’t been able to find much info on this). Is there any type of base modular static mesh set available for UE4? If anyone has ever created maps for Killing Floor 2, you’ll know what I mean. The KF2 creators designed a whole set of premade; but without materials, modular static meshes.
I’ve got a lot of experience in the Killing Floor 2 sdk; which was the UDK3, and I want to create a first person game. Is standard UE4 development done with bsp, or is there some type of standard modular static mesh set?
Thanks a bunch for any help!