This is an example of an animation movie in ue4 made by students in the city where I live.
Miss Daisy on Vimeo
If you go for a very stylized look maybe you could avoid lightmaps at all and go dynamic. You really don’t need the level of photorealism as you’d need for archviz!
Everything shot outside can be made with dynamic light/movable objects (no build time required). You could only bake the shots are that made inside of buildings for more accurate shadows. With a cartoony look (if it’s what you want to achieve) you probably won’t have very long light build times anyway since you probably won’t need to have high res lightmaps.
Good luck
I think your right. I’m going for a cell shaded minimalist approach. And yes a cartoony approach will be what I’m going for so I’m going to follow your advice. But I still have to finish this **** Arch Vis project.