London By-law CP-24, s. 4.8.5.1 — Headroom – Height exceptions Minimum floor to ceiling headroom for habitable space shall follow provisions in 4.8.5, with the following exceptions

Headroom – Height exceptions Minimum floor to ceiling headroom for habitable space shall follow provisions in 4.8.5, with the following exceptions:

• a) except as required in section 4.8.5(a), headroom may have a lower requirement if serving only service rooms and service spaces. This includes service rooms and service spaces/areas that have laundry amenities.
• b) not be less than 1800 mm (5' 11") over stairs and landing. This also includes unfinished spaces/areas with laundry amenities.
• c) except as required in section 4.8.5(a), headroom may have a height of 1.92m (6’3”) only where a door frame is located under a structural load bearing element.