MRL vs Machine Room Elevator in Nigeria: Which Is Better for Your Building?
Choosing an elevator is not only about passenger capacity, number of floors or cabin design.
One of the most important decisions developers, architects and building owners need to make is whether to install a Machine Room-Less (MRL) elevator or a traditional machine-room elevator.
Both systems can provide reliable vertical transportation, but they have different requirements when it comes to building space, shaft design, maintenance access, installation and project planning.
For a building project in Nigeria, making this decision early is particularly important. Changing from one elevator configuration to another after the shaft and roof structure have already been completed can result in additional construction work, delays and unnecessary cost.
This guide explains the difference between MRL and machine-room elevators, their advantages and disadvantages, and how to determine which solution is better for your project.
What Is an MRL Elevator?
MRL stands for Machine Room-Less.
In a conventional traction elevator, the traction machine and related equipment are normally located in a dedicated machine room, often above the elevator shaft.
An MRL elevator uses a more compact arrangement that allows the traction machine and major components to be installed within the elevator shaft itself. This removes the need for a conventional separate machine room.
Machine-room-less technology has been commercially established for decades. KONE introduced its MonoSpace machine-room-less elevator in the 1990s, using a compact traction machine located within the shaft.
The major advantage is straightforward:
The building does not need to sacrifice a separate room solely for the elevator machinery.
This is one reason MRL elevators have become common in modern residential apartments, hotels, offices and other developments.
What Is a Machine-Room Elevator?
A machine-room elevator uses a dedicated equipment room separate from the lift shaft.
Depending on the design, this room is commonly positioned above the elevator shaft, although the exact arrangement depends on the elevator system.
The machine room normally provides dedicated space for equipment such as:
Traction machine
Controller
Governor
Electrical isolation equipment
Other elevator control and drive components
Traditional machine rooms therefore require additional building space, structural coordination, safe access, lighting and ventilation.
Otis describes conventional lift machine rooms as restricted equipment areas normally housing machinery and control components used to operate the elevator.
MRL vs Machine Room Elevator: Quick Comparison
| Feature | MRL Elevator | Machine-Room Elevator |
|---|---|---|
| Separate machine room | Not normally required | Required |
| Building space | Saves space | Requires additional space |
| Machinery location | Mainly within shaft | Dedicated machine room |
| Modern residential buildings | Very suitable | Suitable |
| Hotels & offices | Very suitable | Suitable |
| Maintenance access | More compact | More dedicated working space |
| Architectural flexibility | High | Requires machine-room planning |
| Installation planning | Shaft requirements are critical | Shaft + machine room must be coordinated |
| High-speed/special applications | Depends on system | Often advantageous |
| Equipment accessibility | More confined | Generally easier |
Neither system is automatically better in every situation.
The correct choice depends on the building.
1. Building Space
For many projects, this is the biggest difference.
An MRL elevator eliminates the need for a conventional machine room, allowing the architect to use that space for something else.
Manufacturers specifically identify improved use of building space as one of the major benefits of modern machine-room-less layouts.
This can be particularly valuable in:
Residential apartment developments
Hotels
Office buildings
Smaller commercial developments
Buildings with restricted roof space
Existing buildings being converted to accommodate an elevator
Every square metre matters in a commercial building.
If a dedicated machine room can be eliminated without compromising the project's technical requirements, the recovered space may be used for building services, storage or other purposes.
Winner for space: MRL
2. Shaft and Headroom Requirements
A common misunderstanding is that an MRL elevator requires almost no space above the highest floor.
That is incorrect.
Machine Room-Less does not mean Machine-Space-Less.
The elevator still requires sufficient space for the traction machine, pulleys, car-top equipment, safety clearances and maintenance access.
These components are simply arranged differently.
This means the following must still be confirmed before construction:
Shaft width
Shaft depth
Pit depth
Headroom
Landing opening dimensions
Guide-rail arrangement
Structural support points
Equipment access
Never construct the elevator shaft based only on a generic online dimension.
The correct dimensions depend on the specific elevator capacity, speed, door configuration and equipment selected for the project.
For more information, read our guide on Elevator Installation Requirements: Shaft Size, Pit Depth, Headroom and Power Supply.
3. Construction Requirements
A machine-room elevator requires the building contractor to provide both:
The elevator shaft
The machine room
The machine room may require additional structural work, access arrangements, electrical installations and ventilation.
With an MRL elevator, the dedicated machine room is removed from the design.
That can simplify some elements of the building structure, but it makes accurate shaft construction even more important because major elevator components must fit within the designed hoistway.
The decision should therefore be made before the structural design is finalised.
Changing the elevator type after the roof slab, headroom or shaft dimensions have already been completed can create avoidable problems.
4. Maintenance and Accessibility
Machine-room elevators have one traditional advantage:
Technicians normally have a dedicated area in which to access major equipment.
A well-designed machine room provides working space around the traction machine, controller and other components.
With an MRL elevator, some equipment is located within or around the shaft, so maintenance procedures and access arrangements are different.
This does not mean that MRL elevators are inherently difficult to maintain.
Modern MRL elevators are designed specifically with service access in mind and have now been in commercial service for decades.
However, proper technical knowledge, compatible spare parts and technicians familiar with the particular control and traction system remain extremely important.
When buying an elevator, therefore, don't ask only:
“What is the purchase price?”
Also ask:
“Who will maintain this elevator five or ten years from now, and will the spare parts be available?”
That question can be much more important over the life of the building.
5. Power Consumption
You may hear claims that every MRL elevator automatically consumes less power than every machine-room elevator.
The comparison is not that simple.
Energy consumption depends heavily on:
Traction-machine technology
Motor efficiency
Elevator capacity
Number of floors
Travel height
Number of trips
Counterweight configuration
Control system
VVVF drive technology
Standby consumption
Regenerative technology where installed
Many modern MRL elevators use compact permanent-magnet gearless traction machines and variable-frequency drives, technologies associated with improved efficiency.
Current manufacturers continue to promote MRL systems as part of their space- and energy-efficient elevator ranges.
But you should compare the actual technical specifications of the elevators being offered, rather than choosing purely because one quotation says “MRL.”
6. Generator and Backup Power in Nigeria
Power planning is especially important when selecting elevators for Nigerian buildings.
The building's generator, transformer, automatic changeover system and elevator must be considered together.
The electrical engineer should confirm:
Elevator connected load
Required voltage and phase
Running current
Starting characteristics
Generator capacity
Other loads operating simultaneously
Voltage stability
Protection and earthing
Automatic Rescue Device requirements
Do not select a generator simply by looking at the motor's kW rating.
The entire electrical arrangement needs to be coordinated with the elevator manufacturer or supplier.
An Automatic Rescue Device (ARD) should also not be confused with a generator.
An ARD is primarily designed to rescue trapped passengers during a power failure by moving the elevator to an appropriate landing and opening the doors. It is not intended to operate the elevator normally throughout a prolonged power outage.
7. Noise and Passenger Comfort
The machine arrangement alone does not determine whether an elevator will be quiet.
Ride quality and noise depend on the complete system, including:
Traction machine
Guide rails
Guide shoes
Rail alignment
Cabin construction
Door operator
Controller tuning
Installation quality
Building structure
A properly selected and installed gearless MRL elevator can provide excellent ride comfort.
Likewise, a correctly engineered machine-room elevator can provide extremely smooth and quiet operation.
Installation quality matters just as much as equipment specification.
8. Which Is Better for Residential Apartments?
For many modern apartment buildings, an MRL passenger elevator is often a very practical choice.
The main reasons are:
No dedicated conventional machine room
Efficient use of building space
Compact traction equipment
Modern gearless configurations
Suitable options across common residential capacities
For developers trying to maximise usable building space, this can be especially attractive.
However, the elevator must be selected before the architectural and structural drawings are finalised.
9. Which Is Better for Hotels?
Both configurations can work very well in hotels.
The decision should consider:
Number of guestrooms
Number of floors
Expected passenger traffic
Service elevator requirements
Desired speed
Number of elevators
Peak check-in/check-out traffic
Restaurant or conference facilities
Maintenance strategy
A small hotel and a large multi-storey hotel can have completely different elevator traffic requirements.
For larger projects, traffic calculations may show that two elevators with the correct capacity and speed perform better than one larger elevator.
The number of passengers printed on the elevator specification alone does not determine whether the system can efficiently serve the building.
10. Which Is Better for Hospitals?
Hospital elevators require additional consideration.
A hospital lift may need to accommodate:
Hospital beds
Stretchers
Medical equipment
Staff
Patients
Wheelchairs
Emergency movement
Car dimensions, door width and loading requirements therefore become extremely important.
The choice between MRL and machine-room configuration should come after defining the operational requirements of the hospital elevator, rather than before them.
11. Which Is Better for High-Rise Buildings?
As buildings become taller, elevator selection becomes more complex.
Factors such as:
Travel height
Speed
Passenger traffic
Number of elevators
Motor capacity
Rope arrangement
Shaft efficiency
Emergency operation
Traffic-control strategy
become increasingly important.
Although MRL technology is no longer limited only to very small buildings—manufacturer offerings now extend machine-room-less configurations into significant travel heights and capacities—special applications may still favour a dedicated machine-room arrangement.
The system should therefore be engineered around the project rather than chosen simply because MRL technology is newer.
12. Don't Choose an Elevator Based Only on “MRL”
This is one of the most important points.
Two quotations may both say:
“8 Passenger, 1.0 m/s, MRL Passenger Elevator.”
Yet the actual systems could be very different.
Compare:
Traction machine
Control system
Door operator
Safety gear
Governor
Guide rails
Cabin construction
COP and LOP
Door sensors
Automatic Rescue Device
Electrical components
Spare-parts availability
Warranty
Technical support
Installation quality
The words “MRL elevator” describe the equipment arrangement.
They do not describe the overall quality of the elevator.
MRL or Machine Room: Which One Should You Choose?
For many new residential, hotel and commercial developments in Nigeria, MRL elevators offer an excellent combination of modern technology and efficient use of building space.
However, machine-room elevators continue to be appropriate for many applications, particularly when the project has sufficient space and the design benefits from dedicated machinery access or has specialised speed, capacity or operational requirements.
A simple way to think about it is:
Consider an MRL elevator when:
Building space is valuable
You want to avoid a conventional machine room
The project is residential or commercial
The selected capacity and travel are suitable
The building is still at the design stage
Consider a machine-room elevator when:
A machine room already exists
Dedicated equipment access is preferred
The project has specialised requirements
The elevator has demanding capacity or performance requirements
The building was originally designed for a machine-room system
The final decision should always follow the project's actual technical requirements.
Questions to Ask Before Selecting Either System
Before ordering an elevator, ask your supplier:
What capacity should the elevator have?
What speed is appropriate for the number of floors?
What clear shaft size is required?
What pit depth is required?
What headroom is required?
Is a machine room necessary?
What electrical power is required?
Can the building generator operate the elevator?
What control system and traction machine are being supplied?
Are critical spare parts readily available?
Who will provide maintenance after installation?
What warranty is included?
These questions often reveal more about an elevator quotation than the price alone.
Plan the Elevator Before Building the Shaft
Whether you choose an MRL elevator or machine-room elevator, the most important decision is to involve the elevator supplier early.
Elevator capacity, shaft dimensions, door openings, pit depth, headroom, structural requirements and electrical supply should all be coordinated before construction reaches an advanced stage.
At J & P Global Lifts & Elevators, we support developers, contractors, architects and elevator professionals with complete elevator systems, components and technical guidance for projects across Nigeria.
If you're planning an elevator project, send us your:
Architectural drawing
Number of floors
Required passenger capacity
Proposed shaft dimensions
Building type
Our team can help determine the appropriate elevator configuration before expensive structural decisions are made.
Planning a new elevator project? Contact J & P Global Lifts & Elevators for technical guidance and a project-specific quotation.
Frequently Asked Questions
What does MRL mean in elevators?
MRL means Machine Room-Less. The elevator is designed so that the main traction equipment can be accommodated without a traditional separate machine room.
Does an MRL elevator still have a motor?
Yes. An MRL elevator still requires a traction machine or other drive equipment. The difference is primarily where the machinery is installed.
Is an MRL elevator better than a machine-room elevator?
Not automatically. MRL elevators are especially attractive where space saving is important, while machine-room elevators remain appropriate for many projects. Capacity, travel height, speed, maintenance requirements and building design should determine the choice.
Do MRL elevators require headroom?
Yes. MRL elevators still require sufficient headroom for machinery, car-top equipment, clearances and safety requirements.
Are MRL elevators suitable for residential buildings?
Yes. Modern MRL passenger elevators are commonly designed for residential and commercial applications where efficient use of space is important.
Can an MRL elevator run on a generator?
Potentially, yes, but the generator must be correctly sized for the specific elevator and the other connected building loads. The elevator supplier and electrical engineer should verify the generator capacity before installation.
Which elevator is best for a building in Nigeria?
There is no single best elevator for every building. The correct solution depends on the number of floors, passenger traffic, capacity, shaft dimensions, available headroom, power supply, building use and maintenance requirements.