Researching Setting

I've been doing some research for buildings that would work for my game. I found a few images of Victorian buildings that could be repeated with minor changes without the player noticing. This would allow me to randomise which buildings are chosen to make the setting look believable.
My plan for creating these buildings is to model the individual parts, such as the windows and shop signs so that I can piece together the buildings in Unreal using the different parts and create different buildings without having to create each building from scratch. I believe this is called Modular Building.