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Machine-room-less (MRL)
Building Supported


Building supported MRLs are a more robust product with a wider range of applications.


They require a pit, hoistway, overtravel, and in most U.S. jurisdictions, a control space.  In many locations outside of the U.S. the controller is placed within an entrance jamb, eliminating the need for a separate control space.


This product has greater design flexibility.  Building Supported MRLs can accommodate additional interior weight for custom cab finishes, and can be provided with destination dispatching. 


The product is ideal for:

  • Low to Mid-rise Office Buildings (<300' of travel, 28 stops)

  • Hotels

  • Residential Buildings

  • Retail

  • Parking Zones or stand alone structures

  • Low rise zone of a multi-zoned building




Anchor 3

Below are general planning dimensions for the hoistway, pit and overhead for Building Supported MRL products.  The dimensions accommodate a minimum of four manufacturers for each Capacity. 


The planning dimensions are intended to offer assistance in early core space planning.  As a design develops, designers should verify the dimensions for all desired manufacturers.  


To use the table, Search by entering the desired capacity or speed.  For multi-car groups, the structural engineer should confirm the separator beam widths.

Plan View

If the project is in a seismic area, add 4" to Shaft Width "A".


If the project has occupied space below the elevator pit, the elevator will requires a counterweight safety.  This adds +5" to Shaft Depth "B".


Note, the dimensions are for front opening only applications.  If the elevator has rear openings, the counterweight will be located on the side, which will change the Shaft Width "A" and Shaft Depth "B" dimensions.

Several manufacturers will require structural support in the Overhead to mount the machine.  Others support the machine on the back of the guide rail.  Initial planning should accommodate all products until such time the elevator contractor is selected.


If the project is in a seismic area, add 4" to Overhead "OH".


The Overhead "OH" dimensions are for standard 8'-0" tall cabs, and allow for an 8" hoisting beam; 5000lbs capacity.  If tall cabs (9'-0" or 10'-0") are desired, add 1' to 2' to the Overhead, respectively.


We have provided this planning information to save our clients time comparing various product offerings during initial planning of a project.  The information is not intended to replace the necessary diligent planning required for development of construction documents.  Local code variations may affect dimensions. 

Section View
Control Room

The ideal location for the controller room is adjacent the elevator hoistway, at the top landing.  This location avoids remote conduit and wiring runs, and result in the most economical elevator installation.


The control room can be located remote from the hoistway; as a general guideline, we suggest no more than 150' linear separation between hoistway and control room.


A 6'-0" x 6'-0" room is sufficient for a single control room.  Control rooms for multi-car groups will vary depending on the number of elevators in the group. 

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