What makes a space 'permit-required' under OSHA?
Four conditions per 1926.1202: (1) large enough to enter and perform work, (2) limited means of entry/egress, (3) not designed for continuous occupancy, AND (4) contains one or more of: hazardous atmosphere, engulfment hazard, internal configuration trap, or any other recognized serious safety/health hazard. The fourth criterion is the one that catches teams off-guard — a non-permit space becomes permit-required when work introduces a hazard, like welding or solvents.