House exteriors are done by FCs in the workshop.

It would be a nice solo crafting task if there were optional crafted insides - pillars, ceiling, stairs - that were made by solo crafters. Not easy crafts, but something to be unlocked, something that doesn't need a house to make, something that needs some rare gathered materials.

Want candy pillars inside? A solo crafter could make them with something as hard to get as the Balsamic clay needed for the exterior.