I'm working on a big building, mostly office but not exclusively, in Stockholm, Sweden. I'm currently working on a restaurant on the ground floor with an entrance from outside. I'ts larger then 3000 square feet but it's not the buildings main entrance. The reason I'm not sure if this entrance needs a vestibule is exception b "Doors not intended to be used as a building entrance" and I found:

"Interpretation: A door that is not a main public entrance to the building is not required to have a vestibule. A controlled access door that opens to a patio which does not have egress from the building’s exterior would not be considered a building entrance door and therefore would not require a vestibule".

This question has probably been discussed earlier but I can't find it and hope someone can help me. Do I need a vestibule on my entrance door for the restaurant?

Thanks