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Modular homes are often placed on basements or crawlspaces primarily because a significant number of mechanical systems, such as plumbing, heating, and electrical systems, are installed in these areas. This design choice offers practical benefits, as it provides easy access for maintenance and repairs, which is vital for the longevity and functionality of the home.

Basements or crawlspaces also facilitate proper drainage and can contribute to energy efficiency by allowing the systems to be protected from extreme weather conditions. Additionally, situating modular homes in this way can help to elevate them above potential flooding levels in certain regions, further enhancing their resilience.

While other factors, such as aesthetics and zoning regulations, may also play a role in where modular homes are placed, the integration of mechanical systems into basements or crawlspaces directly contributes to overall home functionality and operational efficiency.