Lobbies & Atria

Lobbies and atria are the large internal volumes that organise a building: ground floor lobbies leading to lifts, and multi-storey atria that bring daylight into deep plans and connect floors visually. They combine architectural finishes, high-level glazing and lighting, open edges at upper levels, and in atria, smoke control systems that make the open volume safe in a fire. Functionally they must be safe to stand under and beside, comfortable, maintainable at height, and controllable in a fire.

What shortens fitness for purpose:

• Maintenance access that was never designed, so high-level items are neglected.
• Solar gain and stratification that make atria hot at upper levels.
• Alterations that enclose or infill the volume and undermine smoke control.
• Acoustic problems as hard finishes reflect noise.

Atria are often the oldest-looking part of a refurbished building, because their height makes them the hardest and most expensive area to refresh.

Overhead glass and falling objects

Atrium roofs and high glazing overhang occupied floors. Overhead glass must hold together when broken; older monolithic toughened or wired glass can fall. High-level fittings, signs and decorations can also fall if fixings corrode or are disturbed.

Falls from upper levels

Atria create open edges on every upper floor. Balustrades below current heights, with climbable rails or furniture placed against them, and glass panels that can break and fall, create fall risks to people above and impact risks to people below. Some buildings have needed screens to prevent deliberate falls.

Smoke control failure

An atrium connects floors that would otherwise be separate compartments. In a fire, smoke rises into the atrium and must be exhausted fast enough to stay above people. Failed fans, blocked make-up air, enclosed floors and untested systems turn the atrium into a smoke chimney.

Comfort and condensation

Atria stratify: hot air collects at the top, making upper walkways uncomfortable, while the ground floor is cold and draughty. Glazed roofs gain heat in summer and lose it in winter, and condensation drips from cold glass and frames.

Acoustics

Large volumes with hard finishes echo, making announcements unintelligible and lobbies noisy.

Inaccessible maintenance

Lights, detectors, speakers and glazing at height that can only be reached by scaffold or large lifts go unmaintained, and failed lights and detectors are left in place.

On site

• Balustrade heights and climbability at upper levels; furniture or planters against them.
• Glass type markings in atrium roofs and balustrades; cracked panes.
• Leak staining on atrium floors and walls; condensation marks.
• Failed high-level lights and fittings left in place.
• Upper walkways noticeably hotter than the ground floor.
• Smoke curtains, vents and fans present; obstructions around them.
• Infilled floors or new enclosures within the atrium.

In the records

• Fire engineering report and atrium smoke control design.
• Integrated smoke control test reports.
• Glass schedules for roof and balustrades.
• Maintenance access strategy.
• Leak history.

• Furniture, planters or display stands placed against upper-level balustrades.
• Echo making announcements hard to understand.

Problems in atria are usually of three kinds: safety at the edges and overhead, smoke behaviour in a fire, and comfort and maintenance. Each needs its own specialist, and the smoke question is the one most often left untested after alterations.

Findings are graded by what they demand: safety (can hurt someone now), failure (failed and damaging the building), condition (distress present and progressing), lifecycle (renewal due on age and exposure), deadline (a regulator or ordinance sets the date), check (investigate before sizing works) and nil (cosmetic or stable).

A building surveyor or façade engineer with a fire engineer and services engineer.

• Overhead glazing survey: glass types, seals, gutters, cracked or loose panes, from access equipment.
• Edge survey: balustrade heights, openings, climbability, glass type and fixings at every upper level.
• Smoke control review against the fire engineering report, with integrated testing.
• Comfort survey: temperature profile by level, draughts, solar gain, condensation.
• Acoustic assessment where announcements or noise are a problem.
• Maintenance access review: how every high-level item is reached.
• Alteration review: changes to the volume since design.

The report should state safety items, smoke control status, comfort and acoustic issues, and a maintenance access and refurbishment plan.

Inspection of high-level elements is best combined with scheduled glazing cleaning or smoke testing, when access equipment is already in place.

• Overhead glass: replace with laminated glass or add protective screens; renew seals and gutters.
• Balustrades: raise heights, close climbable rails, replace monolithic glass, add screens where risk warrants.
• Smoke control: repair fans and dampers, restore make-up air, redesign after alterations.
• Comfort: high-level exhaust or destratification fans, solar control glazing or films, draught lobbies at entries.
• Acoustic treatment: absorptive panels, baffles and finishes.
• Maintenance access: gantries, monorails, winches for lights, or relocation of equipment to reachable positions.
• Refurbishment of finishes and lighting.

• Edge management: rules and fixings that keep furniture, planters and display items away from balustrades so they cannot be climbed.
• Condensation control: thermally broken frames, warm air washes over glazing, or humidity control where drips recur.

High-level work in atria is dominated by access: scaffolds over occupied floors, specialist lifts and out-of-hours work. Glazing and balustrade works are per pane or per metre plus access. Smoke control works and redesign are lump sums. Maintenance access installations are lump sums that reduce future costs. Refurbishment is a lump sum.

Safety items are immediate or code compliance; smoke testing recurs; refurbishment is lifecycle; access installations are improvements with operating savings.

Because access is the main cost, inspection, cleaning, lamp replacement and glazing repairs should be bundled into a single high-level campaign every few years rather than done piecemeal.

• Australia. The National Construction Code treats atria as a special case, with smoke hazard management, sprinklers and separation requirements; AS 1288 governs overhead and barrier glass and AS 1668.1 smoke control; changes to an atrium generally need fire engineering review and building approval.
• United Kingdom. Approved Document B and BS 9999 cover atria, including when they may connect floors and what smoke control they need, with smoke control components to the BS EN 12101 series; Approved Document K covers guarding and glazing; higher-risk residential atria fall under the Building Safety Act 2022.
• United States. International Building Code Section 404 governs atriums, requiring sprinklers and smoke control designed and tested under Section 909 and NFPA 92; guards follow Section 1015 and overhead glazing Chapter 24; alterations need fire department review.

• Fire engineering report and atrium smoke design.
• Integrated smoke control test reports.
• Glass schedules for roof and balustrades.
• Maintenance access strategy and equipment certification.
• Leak and condensation history.
• Records of alterations within the atrium.

• Balustrade and edge protection certificates.
• Comfort and condensation complaints by level.
• High-level lighting and detector maintenance records.