West Virginia builds modular to the State Building Code; much of the state has little or no zoning, which can make adding a unit simpler — the work is snow and steep-lot foundations.
Building approval
WV State Fire Commission / State Fire Marshal
Program
WV State Building Code (2018 I-codes) — Home rule — national code, locally enforced
ADU law
Local (much of WV has no zoning)
ADU summary
No statewide ADU law; much of rural WV has little/no zoning (often simpler).
Site / structural drivers
Mountain snow + steep lots
Verdict
Light zoning; ADUs local
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Through the West Virginia State Fire Commission, which adopts and maintains the State Building Code (WV adopted the 2018 I-codes and 2020 NEC effective August 1, 2022). Modular units are built to that code and factory-inspected before delivery; your local authority handles the on-site permit (foundation, utilities) and, where zoning exists, land use. In areas without local building enforcement, the State Fire Marshal's office is the point of contact.
Often, yes. Large parts of rural West Virginia have little or no zoning, so adding an accessory unit can be more straightforward than in heavily-zoned states — you focus on the building code, septic/water, and the foundation rather than a zoning approval. But where a municipality has zoning (like Morgantown), you must follow its ADU standards and rental-registration requirements. Always confirm whether your parcel is in a zoned jurisdiction.
No. ADUs are governed locally, and because zoning coverage is uneven, the experience varies widely. Where rules exist, the minimum ADU size referenced is around 150 sq ft, with local size, setback, and parking standards. Confirm your specific city or county.
General information, current as of 2026 — not legal advice. Confirm specifics with your local jurisdiction.
Mountain snow and cold. The higher elevations carry heavy ground-snow loads that drive roof and structural design, and a high-performance thermal envelope matters for the winters. Steep, hard-to-access lots are common, so foundation design (often helical piles) matters too. Seismic risk is low. PSL Modular sets the snow load and foundation from your site.
Yes. Light zoning plus strong cabin and energy-sector workforce demand make modular attractive — finished units arrive and set quickly, even on remote mountain sites. The building is code-inspected at the factory; your work is the site (access, foundation, septic) and, where applicable, local zoning.