Legality of selling home 12x33 home? Under 400 sq ft

Hello,

I found some 12x33 ft homes for sale for $17,000. These are 396 sq feet and therefore titled as an RV.

They have 2 small bedrooms with a kitchen and bathroom.

Is it legal to sell these for year round living?

I would call your local building/zoning department, and if I didn’t like the answer would get a second opinion from an attorney.