Whether it be to accommodate a growing family, visiting friends, or a vacation rental business, a modular guesthouse can be a time- and cost-effective alternative to more traditional builds or remodels. From the mountains of Spain to the backyards of Connecticut, we take a look at some prefabricated guesthouses that we can’t get enough of.

1. Cabana Beach by Cubicco

2. American House 08 by William Massie

3. Element House by MOS Architects

4. Shipping Container Retreat by Jim Poteet

5. Mono by DROP Structures

6. The Sturgis by Cubist Engineering

7. Modern Dwelling by Kanga Room Systems

8. Fish Camp by Rocio Romero

9. House Arc by Bellomo Architects

10. Shelter by Vipp

11. High-Tech Countryside Retreat by NOEM & Aitor Iturralde Martín

12. That Extra Bedroom by Sett Studios

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12 Prefab Guesthouses You’ll Want to Put in Your Own Backyard