A machine-room-less lift puts a compact permanent-magnet gearless motor inside the shaft, usually at the top beside the guide rails. The room that used to sit above the shaft disappears, and with it a slab, a door, ventilation and a lot of arguments with the architect.
What you gain
- Roughly 8–12 square metres of floor area back on the top slab.
- Lower running cost — a gearless PM motor typically draws 30–40% less than an equivalent geared machine.
- Quieter travel, because there is no gearbox and no oil to heat.
- A shorter, cleaner building elevation with no machine room box on the roof.
What you give up
Servicing happens inside the shaft, so technicians need proper working platforms and the maintenance regime is stricter. Component replacement is also less improvisable — you are committed to the manufacturer for the drive.
For anything under about 20 floors, MRL is now the default. Above that, and for heavy goods duty, a geared machine in a proper room still earns its place.
The honest middle ground
Hydraulic lifts remain the cheapest option for two or three stops and heavy loads, at the cost of energy use and speed. If your building is short and the duty is occasional, do not let anyone talk you out of hydraulics on fashion grounds.
