My state does not require a door on a guest bathroom in a hotel. A bathroom serving employees and the public in a hotel is required to have a self-closing door, but the law does not say anything about doors on guest only bathrooms.

I couldn’t find anything in the International Building Code about bathroom doors aside from minimum opening width, but I don’t have access to the full code. I’d have to ask an architect or GC to verify.

> 4625.1200 TOILET REQUIREMENTS.

> Every hotel, motel, and lodging house shall be equipped with adequate and conveniently located water closets for the accommodation of its employees and guests. Water closets, lavatories, and bathtubs or showers shall be available on each floor when not provided in each individual room. Toilet, lavatory, and bath facilities shall be provided in the ratio of one toilet and one lavatory for every ten occupants, or fraction thereof, and one bathtub or shower for every 20 occupants, or fraction thereof. Toilet rooms shall be well ventilated by natural or mechanical methods. The doors of all toilet rooms serving the public and employees shall be self-closing. Toilets and bathrooms shall be kept clean and in good repair and shall be well lighted and ventilated. Hand-washing signs shall be posted in each toilet room used by employees. Every resort shall be equipped with adequate and convenient toilet facilities for its employees and guests. If privies are provided they shall be separate buildings and shall be constructed, equipped, and maintained in conformity with the standards of the commissioner and shall be kept clean.

> https://www.revisor.mn.gov/rules/4625.1200/

A water closet is just water shelving without a door.