Fire Doors for Lift Landings in High-Rise Buildings — UK Requirements

Approved Document B and BS 9999 introduce height-based thresholds that determine the minimum fire resistance rating of doors protecting vertical circulation in taller buildings. For architects and building services consultants working on towers, the provisions governing lift lobby and firefighting shaft doors are among the most consequential in the entire document — they directly govern door specification at every landing, on every floor, for the life of the building.

Why Height Changes the Requirement

As a building gets taller, conventional fire and rescue service ladder access becomes impractical, shifting reliance onto the building's own vertical circulation for both evacuation and firefighting access. Above the height thresholds set out in Approved Document B, a firefighting shaft — a protected stair and lobby arrangement, often paired with a firefighting lift — becomes a mandatory feature, and the doors that form its enclosure are held to a materially higher standard than typical internal doors.

What This Means in Practice

In practical specification terms, every lift lobby door forming part of a firefighting shaft or a protected stairway must be a tested, certified fire door — not a standard commercial doorset with an assumed rating. Firefighting shaft and lobby doors are typically specified to EI 120, reflecting their role in maintaining a protected environment for firefighting and rescue operations during an active fire event. BÖLDT's hollow metal shaft door system, built with 0.8–1.6mm shutter and 1.2–1.8mm frame steel with honeycomb infill, is tested to EN 1634-1 and classified to EN 13501-2 up to 120 minutes to meet this requirement.

It is worth noting that the rating applies to the complete door assembly — leaf, frame, hardware, glazing if present, and the seals — not the leaf alone. A door leaf rated for 120 minutes installed in an unrated frame, or fitted with non-rated hardware, does not meet the requirement. This is why BÖLDT manufactures shutter, frame and hardware coordination in-house, so the assembly arrives as a tested system rather than a collection of parts assembled on site.

Compartmentation Beyond the Lift Lobby

Firefighting shaft and lift lobby door provisions do not operate in isolation. Approved Document B requires that every vertical opening — stairs, lifts, or service shafts — be enclosed or protected, with openings in fire-resistant walls protected by self-closing fire doors having a fire resistance rating equal to that of the wall. For a high-rise tower, this means the lift shaft enclosure wall rating and the lift lobby door rating must be read together — a wall rated well above the door creates a weak point in the compartment line that building control will not accept.

What Architects Must Specify

• —Confirm building height against the Approved Document B thresholds at concept stage — this determines whether a firefighting shaft is required and the door ratings across the vertical circulation core.
• —Specify complete tested door assemblies (leaf, frame, hardware, glazing) rather than individually rated components.
• —Match lift lobby door ratings to the fire-resistance rating of the surrounding shaft wall.
• —For taller buildings, plan for EI 120 rated firefighting shaft enclosures with self-closing doors at every landing.
• —Coordinate door swing and clear width with evacuation modelling — a compliant door that obstructs egress flow creates a secondary code issue.

BÖLDT manufactures hollow metal shaft doors and steel fire door systems to these exact specifications, tested to EN 1634-1 and classified to EN 13501-2. For project-specific compliance documentation, our technical team can provide a specification sheet mapped against Approved Document B and BS 9999 for your drawings.