Have a look at a Unity pack that will help you set up all sorts of country houses. 

The set will help you set up a clean bright house or an abandoned dirty one, providing the ability to adjust walls, roof, ceiling, floors, windows, doors, and different props such as sofa, chairs, kitchen set, beds, fireplace, bathtub, tables, and closets.

It is said to feature a custom modular system which speeds up the building process, saving you time on dragging and dropping module prefabs every single time. 

"All the stuff in this pack has been crafted with high attention to detail and industry standards, so your scenes will look full-fledged, artistic and optimized," states the developer. 

You can learn more and get the pack here.