I built a house using geometry shapes, when I start adding my material, textures etc, etc. Would it be better to keep the geometry as BSP or make them into static meshes?
BSPs are procedural geometry and maybe a bit cheaper, but also very clunky. I don’t think that in your case there will be any performance difference, but if you keep them as BSPs you can of course still alter them later, whilst having static meshes forces you to edit them in some other 3D modelling software. 
Ah okay I understand, thank you:)