Donald Qualls
Subscriber
I don't have an enlarger capable of supporting 4x5 and I don't think I currently have the room for one either.
Intrepid has both an enlarger kit for their 4x5 camera (a lightweight monorail, potentially a candidate for my own needs) and a dedicated 4x5 enlarger. Both use compact LED light sources with tunable color for contrast control, and are very small as these things go. You can't avoid the 16x20 baseboard if you want to print that large, but if you're willing to live with, say, 12x15 as a maximum print, you can fit that enlarger into a fairly small space.
I currently have two Omega D series enlargers I'm in process of combining into one with interchangeable color and condenser heads, so my enlarger needs are covered.