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Mid-rise residential without a rooftop room
Mid-rise apartments when shaft and overhead allow — drive in the shaft, no rooftop machine room.
Machine-room layout
MRL elevator
An MRL elevator has no separate rooftop machine room. The drive usually sits in the hoistway on a support beam; the controller is often a cabinet at the top landing. It is common in Iran for mid-rise apartments and retrofits with a tight roof. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
- No rooftop room
- Drive sits in the shaft
- Mid-rise
- When shaft and overhead allow
- Service access
- Planned from day one
System anatomy
What is an MRL elevator and how does it work?
MRL means Machine Room Less: no separate machine room. The drive — usually a compact gearless motor — sits in the hoistway, typically at the top on a support beam. The controller is often a cabinet at the top landing, opened from the corridor. The roof stays free for plant; no rooftop machine room is built.
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In-shaft gearless drive
A compact motor usually mounts at the top of the hoistway on a support beam. MRL is a layout; gearless is a motor type.
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Sheave and ropes
The car still moves on a sheave and ropes — like classic traction; there is simply no separate machine room.
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Counterweight
Offsets part of the car weight. A hydraulic lift does not use this part.
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Controller at the landing
Usually a cabinet at the top landing, reached from the corridor — not inside a rooftop machine room.
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Cabin
The passenger car. Finish and size come from catalog or custom specs — independent of the machine layout.
MRL is a layout name, not a motor name. In Iran most MRLs use gearless motors because they are compact enough for the shaft. Gearless can still have a machine room. Check the motor separately from the MRL label.
You pick the cabin separately from the layout — catalog or custom. The quote comes after the site visit; stops, motor and controller brands, cabin finish, overhead, and service-access design move the number.
Use cases
Which projects suit MRL elevators?
MRL fits a building that cannot spare a rooftop machine room and stays in the mid-rise range. An apartment with no roof room, an old-building retrofit, a roof you want back — those are usually the jobs.
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Retrofit of an older building
When a new rooftop machine room is hard to build, in-shaft MRL is a practical retrofit path — if overhead and service access exist.
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Recovered rooftop space
Removing the rooftop room leaves space for plant or other use — it does not remove overhead inside the shaft.
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In-shaft gearless drive and landing controller
Compact motor on a beam in the shaft; the controller is usually a cabinet at the top landing, opened from the corridor.
If the shaft and overhead do not fit, MRL alone does not solve it. Do not push this layout on a tower, or where the lift must run nonstop at peak hours — a classic machine room is the better fit. Hydraulic is a different story: villas and low-rise.
An honest picture
MRL elevator advantages and limits
MRL does a few things well: no rooftop machine room, a cleaner roof, and a common mid-rise layout when shaft and overhead fit. Those points hold when the service path is in the design from the first meeting.
Advantages
No rooftop machine room
No separate rooftop machine room is built. The roof stays free for plant, storage, or usable space.
Architectural flexibility
The roof line stays cleaner. When a rooftop room would crowd the elevation or the structure, an in-shaft layout eases the job.
Compact, usually quiet drive
Most Iranian MRLs use a compact gearless motor. At typical mid-rise speeds you avoid the noise of a classic rooftop machine room.
Practical for mid-rise
When shaft and overhead allow, it is a common layout for apartments of about 5–12 stops — not for every tower, and not without a survey.
Limits
Harder service access
Technicians usually reach the drive from the car top and access panels, not from a rooftop room. That path must be in the drawings from day one; it needs trained service.
Shaft overhead is still required
Dropping the rooftop room does not mean “no overhead.” Travel still needs headroom at the top of the shaft. We give that figure after measuring — not from a brochure table.
Not automatically cheaper over life
A compact gearless motor and a specialist controller can raise first cost. Service is more specialised too. Losing the rooftop room alone does not cut lifetime cost.
Heavy traffic and high-rise
For a tower, very heavy traffic, or 24-hour uptime, a classic machine room usually gives easier service and more stable operation. MRL is for mid-rise and tight roof space.
Better to name the limits in the first meeting. Car-top service is harder than a rooftop room. Overhead does not disappear. Do not judge lifetime cost by the “no machine room” label. If the lift must run fast and nonstop at peak hours, switch to a classic machine room from here.
Choosing a drive
MRL or classic machine room — which fits your project?
If the building is mid-rise, the roof is tight, or a retrofit makes a rooftop room hard to build, MRL is a serious option. If traffic is very heavy, the building is a tower, or service should come from a machine room, classic MR leads.
Machine room
MRL
Drive in the shaft; no separate rooftop room
Classic machine room (MR)
Separate room above the shaft or on the roof
Overhead and roof
MRL
Shaft overhead still required; roof stays free
Classic machine room (MR)
Overhead plus machine-room volume
Service access
MRL
Car top and panels; must be designed in
Classic machine room (MR)
Walk-in machine room is simpler
Height and traffic
MRL
Mid-rise when shaft and overhead allow
Classic machine room (MR)
Better for towers and heavy traffic
Read the table against your building, not against which system looks more “modern.” An eight-stop apartment with a roof full of plant is often MRL — if overhead and service access fit. The same site as a busy tower with 24-hour uptime tips toward classic MR. Do not confuse MRL with hydraulic; hydraulic is a different drive.
Project path
From survey to MRL elevator handover
An MRL install does not start with picking a cabin finish. First we see the shaft, overhead, service-access path, and where the controller can sit. Without those measurements, two quotes cannot be compared.
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Survey and layout check
Shaft survey, overhead check, service path to the drive, and controller location at the landing.
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Design and quote
Execution drawings, cabin and in-shaft equipment selection, and a transparent phased quote.
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Supply and installation
In-shaft machine, rails, doors, and cabin; controller cabinet at the landing per approved drawings.
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Testing and handover
Safety tests, speed and leveling adjustment, inspection prep, and owner handover briefing.
After the survey, drawings and a phased quote follow: design, supply, install, handover. Exact timing depends on shaft readiness and equipment lead time. After testing we also coordinate the technical inspection. Handover means the lift works and inspection paperwork is moving — not just a cabin on rails.
How quotes are built
How is MRL elevator pricing calculated?
There is no fixed MRL price. Two eight-stop apartments can get very different quotes; usually one has easier overhead and a simpler cabin, the other a tighter shaft, a dearer motor, or a harder service path.
- Stops and travel
- Stop count and travel height drive the motor, ropes, and install time.
- Capacity
- Passenger or freight load drives motor, rails, and shaft structure choices.
- Motor and controller brands
- Gearless-motor and controller brands are a large share of cost and the inspection path.
- Cabin and doors
- Cabin materials, size, and landing-door type change the quote directly.
- Shaft, overhead, and service access
- Shaft size, overhead, controller location, and the designed path to the drive sit on both price and serviceability.
- Site access
- Existing vs new shaft, equipment delivery, and site access move the number. Accurate quotes only after a survey.
We write the number after the survey. Stops and capacity sit on the motor; controller and cabin are chosen separately and move the figure there. If you only heard a lump sum, ask whether shaft steelwork, landing doors, controller location, and service access are inside it.
Project proof
Projects with MRL systems
A few projects where an MRL layout is in place — mostly mid-rise and retrofit. Open a card for the details of each job.
Common MRL elevator questions
Before a site visit the same questions come back: what MRL is, whether a machine room is needed, whether it must be gearless, how many floors, whether service is harder, where price starts, whether it is hydraulic. Short answers are here; numbers and drawings come after the shaft is measured.
What is an MRL elevator?
MRL means Machine Room Less: no separate machine room. The drive and related gear usually sit in the hoistway — typically at the top on a beam — and the controller is often at the top landing. It still uses ropes and a counterweight like classic traction; the difference is where the machine lives.
Does an MRL elevator need a machine room?
A separate rooftop machine room is not required. The drive sits in the shaft and the controller is usually a landing cabinet. Overhead at the top of travel is still required; “no machine room” does not mean no headroom.
Must an MRL elevator be gearless?
No. MRL is a layout; gearless is a motor type. In Iran most MRLs use gearless motors because they are compact enough for the shaft. Gearless can still have a machine room. Write the motor brand and type separately on the quote.
How many floors suit an MRL elevator?
It is a common mid-rise layout when shaft and overhead allow — in practice often around 5–12 stops. There is no fixed floor-count law; the survey decides. For towers and very heavy traffic a classic machine room is usually the better fit.
Is MRL elevator service harder?
Usually yes, compared with a rooftop machine room. Access is from the car top and panels and needs a trained technician. Put that path in the drawings from day one. Do not assume MRL service is cheaper or simpler than a machine-room lift.
How much does an MRL elevator cost?
There is no fixed price. It depends on stops, capacity, motor and controller brands, cabin and doors, shaft and overhead, and service-access design. Atlas Asanbar Arsh provides a transparent quote after survey — residential projects often start in the hundreds of millions of tomans and rise with stops and capacity.
Is an MRL elevator the same as hydraulic?
No. MRL is a traction layout without a separate machine room: motor, sheave, ropes, and counterweight. Hydraulic uses a jack and a power unit beside the shaft and suits villas and low-rise. Both may skip a rooftop room; they are not the same drive.
Related types
If an MRL elevator is not the right fit
If MRL does not fit the height, traffic, or service access of your project, look at the other types here. Traction with a machine room is for towers and heavy traffic; gearless is a motor type, not a layout; hydraulic is for villas and low-rise.
Traction elevator
A traction elevator moves the cabin with steel ropes over a motor-driven sheave and a counterweight. It is the usual choice for mid-rise and high-rise buildings with heavier traffic. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
Gearless elevator
A gearless elevator uses a motor without a gearbox — usually a permanent-magnet synchronous machine coupled straight to the traction sheave. It is common on mid- and high-rise work, but it is not the same as MRL: it runs with a machine room or without one. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
Hydraulic elevator
A hydraulic elevator uses a jack and power unit to move the cabin. It suits villas and 2–6 stop buildings that cannot put a machine room on the roof. Atlas Asanbar Arsh designs and installs in Tehran, Karaj, and cities across northern Iran.
Related resources
MRL elevator services and related reading
Once the layout is clear, continue from here to installation, the MRL guide, or the gearless-motor catalog.
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