Can I run Romex under my house, yes, you can run Romex under your house in crawl space or basement, as long as installed per electrical code with proper protection and support, with Romex allowed in crawl spaces that are not considered wet or damp locations with excessive moisture, with requirements for securing and protection from damage. In crawl space, Romex can be run through joists or stapled to joists, but must be protected from physical damage, with code requiring protection where subject to damage, such as using conduit or guard strips where necessary, and must be supported every 4.5 feet and within 12 inches of boxes. If crawl space is damp or wet, Romex may not be allowed as it is not rated for wet locations, and you may need UF cable or THWN in conduit. Under house in basement, Romex can be run exposed on joists in unfinished basement with protection. So can I run Romex under my house, yes, allowed in crawl space and basement if dry and installed per NEC with proper support and protection from damage, not in direct contact with ground, and not in wet locations, with local code may require additional protection, with best practice to keep Romex away from water and protect where it passes through or near access openings, with electrician ensuring code compliance for under house installation.
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