Getting a modular structure that comes as a kit is the cheapest option for a backyard guest house—some products cost just under $6,000—but that price tag rarely reflects the final cost.

The home was smaller than a parking space—but it's fairly cheap to build and could quickly add new housing options in cities ...

like the Generic Luxury Mobile Prefab House. It’s a house on wheels so you can park it in your backyard as a bonus space or officially be the most glam guest at the RV park. Constructed with eco ...