For what reason are construction costs typically lower for outdoor housing?

Outdoor housing often has lower construction costs primarily because it typically requires less material compared to traditional indoor housing structures. In many cases, outdoor housing can be designed to utilize lighter materials or fewer building components while still providing adequate shelter. This reduction in material needs directly impacts overall costs, making construction more affordable.

The other options, while valid in certain contexts, do not universally apply to all forms of outdoor housing. For instance, while some outdoor structures might not require a foundation or might utilize natural materials, this is not a consistent factor across all designs. Additionally, although temporary structures can sometimes be less costly, this does not encapsulate the full range of outdoor housing options, which can also include permanent installations. Thus, the idea that outdoor housing generally requires less material stands out as the most critical factor for lower construction costs.