I think you would need to identify if the corridor needs to be fire resisting. what make you say that it isn't as most building are divided with plasterboard so long as thew wall has plasterboard each side then it is fire resisting. The fire doors may be older and not up to current standards you need to make a decision if smoke seals and intumescent seals are required. if they have fire detection in the corridors then possible not. if it is sleeping premises then i would look for smoke and intumescent seals as well. these can be retro fitted to doors so no major issue. It would be expensive to replace fire doors every time the standards change so you need to decide if they are suitable and sufficient in context of the use and layout of the premises. Phil

This is what fire risk assessment is all about - nothing standard but it all depends on your assessment. Are you saying the doors are fire doors but fitted in a non fire resisting compartment? If the ceiling is not fire resisting can you look above to the wall over the doors to see if it does form a compartment? If the doors are not fitted in a fire compartment they will not need to be fire doors as in fire resisting.

This issue is frequently the bain of my life! In a lot of situations I have found that fire doors have been used (but not fitted to spec) purely because they are substantial doors.