18. Relaxation of building regulations.

If on an application for a direction1 the appropriate national authority2 considers that the operation of a requirement in building regulations3 would be unreasonable in relation to the particular case to which the application relates, it may, after consultation with the local authority4, give a direction dispensing with or relaxing that requirement5. If building regulations so provide as regards a requirement contained in the regulations, the power to dispense with or relax that requirement is exercisable by the local authority (instead of by the appropriate national authority after consultation with the local authority)6. If building regulations so provide as