Yes it’s possible with Swarm Agent! I bought a 2nd pc to boost my lighting build times!
UE3 doc, because the one for UE4 isn’t there yet. Still valid informations
http://udn.epicgames.com/Three/Swarm.html
Setup tutorial for UE4 :
https://iamsparky.wordpress.com/2010/08/24/tutorial-setting-up-swarm-for-multiple-machines/