Zab

Thank you - can you tell me how I might be sure about that to put my mind at rest

Our three storey dwelling house (3 flats)has old metal exterior staircase that needs to come down. It’s less than 50m3 and not needed as we are fire compliant without it. Can’t find out if we need building control/planning permission . Don’t want to start down that route if unnecessary . Any help thank you