How is a lift installed in an existing school or public building?

Adding vertical transport to a building that never had it is one of the more involved pieces of work that can be carried out in an occupied facility, because it affects the structure, the fire compartmentation and the circulation at the same time.

It is also one of the most common access upgrades on older school and council assets, since a single step or a single level change can exclude a whole floor.

Establishing what the building can take

The first question is structural rather than architectural.

A lift shaft is a vertical penetration through every floor it serves, and the floors have to be opened and trimmed. Which means establishing what the existing structure is, where the load paths run and whether the openings can be formed without transferring load somewhere that cannot take it.

On an older building that frequently means investigation before design: locating beams, confirming slab thickness and reinforcement, and in a heritage building establishing what can and cannot be altered. The same constraint governs the work described in [bridge repair and heritage stone](/answers/bridge-repair-and-heritage-stone).

The pit depth is the other structural item, and on a ground floor slab it means excavation below the existing level, with the services beneath it located first.

Choosing the right type

Three broad options, and the travel distance and the compliance requirements decide between them.

**A conventional passenger lift,** where the travel and the usage justify it. Requires a full shaft, a pit and overhead clearance, and it is the only option that suits a building with significant traffic.

**A vertical platform lift,** which travels a shorter distance, needs less overhead and pit depth, and suits a one or two level change. Slower, and adequate for the duty on most small public buildings.

**A low-rise platform lift or chair lift,** for a single level change where a ramp cannot be accommodated. The least intrusive and the most limited, and the option already covered in [accessible ramps and chair lifts](/answers/how-are-accessible-ramps-and-chair-lifts-installed-for-disability-acce).

The selection is made against the compliance requirement, not against cost alone, because the access provisions set what is acceptable for the building class and the circulation route.

Fire and compartmentation

A shaft through floors is a breach of every compartment it passes through.

Which means the shaft itself becomes a fire-rated enclosure, the landing doors have to achieve the rating, and the penetrations for the lift services have to be sealed to the same standard. Where the lift is in an egress path, the egress provision has to still work with the shaft in it.

That work interacts with the detection and alarm system, since the lift has to respond correctly on alarm, and the interface sits with the work described in [fire services and detection upgrades](/answers/fire-services-and-detection-upgrades).

Building it while the building operates

The shaft construction is noisy, dusty and involves cutting structure, which is incompatible with teaching or public use in the adjacent spaces.

The usual approach is to isolate the shaft footprint from the operating building with full-height hoarding, work from a separate access route, and programme the structural cutting into holiday periods or out of hours. The principles are the same as any work in a functioning facility, set out in [construction in live environments](/answers/construction-in-live-environments) and [noise and vibration near occupied buildings](/answers/noise-and-vibration-near-occupied-buildings).

The floor openings are a fall risk through the whole construction period, which means a designed edge protection and covering regime rather than ad hoc barriers, and the work above sits with [working at height on occupied buildings](/answers/working-at-height-on-occupied-buildings).

Power and machine space

A lift needs a dedicated supply, and on an older building the existing board frequently cannot provide it.

Which means the switchboard capacity is checked early, because an upgrade to the main switchboard is a separate piece of work with its own authority involvement, and it can be the longest lead item on the project. That work is covered in [electrical upgrades in occupied buildings](/answers/electrical-upgrades-in-occupied-buildings).

Machine-room-less lifts remove the need for a separate plant room, which on a constrained site is usually the deciding factor.

Commissioning, registration and handover

A lift is registered plant. It is commissioned by the supplier, inspected, registered, and handed over with its certification, its maintenance agreement and its emergency release procedures.

The handover documentation includes the items the asset owner needs to operate it: the service schedule, the emergency contact arrangements, and the procedures for a person trapped in the car. Those sit inside the pack described in [handover documentation and operation manuals](/answers/handover-documentation-and-operation-manuals).

Practical completion is not reached until the registration is in place, which is worth programming rather than assuming.