It's all about small changes. Getting a whole prefabbed house is a thing, but not the nicest. But pre-fabbed roof trusses are very common now. It's more work to

It's all about small changes. Getting a whole prefabbed house is a thing, but not the nicest. But pre-fabbed roof trusses are very common now. It's more work to ship those than the pieces, but on-site labor savings and consistency make it valuable. Pre-hung doors with doorframes are also the norm. I'm not in the industry, but I could imagine there's some possibility for pre-fabbed wall panels, but I don't know how much that really saves, because I wouldn't think you want to pre-hang the drywall, it'll get damaged in shipping. Maybe you could prehang exterior sheathing. But it's a big increasing in shipping volume to save only a little bit of time and have a much less flexible layout.