A Practical Guide for Architects
Introduction
Lifts, also known as elevators, are an essential part of vertical circulation in residential, commercial, institutional, healthcare, hospitality, and high-rise buildings. Their planning affects not only how people move between floors but also the building’s core layout, structural grid, circulation efficiency, accessibility, and service coordination.
For an architect, lift planning involves much more than selecting a passenger capacity and drawing a rectangular shaft. It requires understanding the relationship between the lift car, hoistway, landing doors, pit, overhead clearance, lobby, supporting structure, and the building’s intended use.
A lift that appears to fit on an architectural plan may still be unsuitable if its door opening is too narrow, its lobby obstructs circulation, its pit conflicts with foundations, or its equipment cannot be installed within the available overhead space.
This guide explains the essential principles of lift planning and dimensions, with particular attention to architectural practice in India. It also outlines how to coordinate lift requirements with structural engineers, building-services consultants, and the lift manufacturer.
Important: All dimensions presented as examples or historical guidance must be checked against the applicable building regulations, current standards, local lift rules, accessibility requirements, and the selected manufacturer’s approved drawings. This article is an educational planning reference, not a substitute for an approved lift design.
1. What Is Lift Planning?
Lift planning is the process of determining the appropriate number, capacity, type, location, arrangement, and dimensional requirements of lifts within a building.
It involves coordinating vertical transportation with the architectural layout, structural design, circulation system, accessibility provisions, and building services.
Main objectives of lift planning
- Provide convenient access between the floors served.
- Accommodate expected passenger or goods movement.
- Minimize unnecessary walking and waiting.
- Integrate the lift core efficiently with stairs and corridors.
- Provide appropriate access for wheelchair users and people with reduced mobility.
- Accommodate furniture, equipment, stretchers, beds, or goods where required.
- Coordinate shaft dimensions, pit depth, overhead clearance, and structural loads.
- Meet applicable safety, accessibility, fire-safety, and statutory requirements.
- Allow for installation, inspection, maintenance, and eventual equipment replacement.
What determines lift dimensions?
Lift dimensions depend on several interacting factors:
- Rated load and intended passenger capacity.
- Internal car width, depth, and height.
- Door type, position, and clear opening.
- Counterweight position and guide-rail arrangement.
- Lift speed and travel height.
- Drive system and equipment configuration.
- Required pit depth and overhead clearance.
- Number and orientation of entrances.
- Accessibility and building-use requirements.
- Manufacturer-specific design and applicable regulations.
Consequently, there is no single universal shaft dimension for every lift with the same passenger capacity.
2. Basic Components and Dimensions of a Lift
Understanding the terminology is the first step toward preparing accurate architectural drawings.
2.1 Lift car
The lift car is the enclosed space in which passengers or goods travel.
Its internal dimensions should suit the intended use. A residential passenger car, a public-building accessible car, and a hospital bed lift serve different requirements even when their rated loads are similar.
2.2 Lift shaft or hoistway
The lift shaft is the vertical enclosure through which the lift car travels. It accommodates equipment such as guide rails, the counterweight where applicable, landing entrances, and associated components.
The clear internal shaft dimensions must be distinguished from the overall dimensions of the surrounding reinforced-concrete or masonry enclosure.
2.3 Landing door
The landing door provides access to the lift car at each served floor.
Its clear opening, position, frame requirements, and sill arrangement must be coordinated with the car entrance and finished floor levels.
2.4 Lift pit
The pit is the space below the lowest landing level.
Its depth and arrangement depend on the selected equipment and safety provisions. Drainage, waterproofing, foundations, inspection access, and other services must be considered without compromising the lift installation.
2.5 Overhead clearance
Overhead clearance is the vertical space required above the uppermost landing for the lift car and associated equipment and safety clearances.
It is not simply the distance from the top-floor finish to the roof slab. The required measurement must be taken from the specific reference levels identified on the approved lift drawings.
2.6 Machine room
Some lift installations require a separate machine room, while machine-room-less (MRL) systems integrate the relevant equipment within the hoistway or designated equipment spaces.
The absence of a conventional machine room does not eliminate the need to provide equipment access, maintenance clearances, electrical provisions, or the manufacturer’s required structural arrangements.
2.7 Lift lobby
The lift lobby is the circulation and waiting space outside the landing doors. Its dimensions depend on the lift arrangement, expected traffic, building use, door operation, accessible circulation, and applicable requirements.
It should be planned as a usable circulation space rather than merely the residual area left between the lift doors and the opposite wall.
3. Lift Planning Dimensions: What Architects Must Measure
The following table identifies the key dimensions that should appear in the planning and coordination process.
| Dimension | Meaning | Architectural importance |
|---|---|---|
| Car width | Internal clear width of the lift car | Determines passenger movement and usable space |
| Car depth | Internal clear depth of the car | Affects wheelchair, trolley, stretcher, and goods accommodation |
| Shaft width | Clear internal width of the hoistway | Accommodates the car, rails, equipment, and required clearances |
| Shaft depth | Clear internal depth of the hoistway | Depends on car depth, counterweight, and equipment layout |
| Door clear opening | Usable opening when the door is open | Affects accessibility and movement of occupants or objects |
| Pit depth | Vertical distance below the designated lowest landing level | Affects foundations, waterproofing, and equipment installation |
| Overhead | Required vertical space above the uppermost landing | Affects roof, penthouse, and upper-floor planning |
| Floor-to-floor height | Vertical distance between consecutive finished floor levels | Affects lift travel, entrance levels, and installation coordination |
| Lobby width and depth | Clear circulation and waiting space outside lift doors | Affects queuing, turning, and passage through the building core |
| Structural opening | Opening and supporting construction around the shaft and entrances | Requires coordination with beams, slabs, walls, and lintels |
Drawing convention: Clearly identify whether a dimension refers to the finished internal clear size, the structural opening, or the overall enclosure. These measurements are not interchangeable.
4. Indicative Lift Dimensions and Accessibility
Architects often need preliminary dimensions before the lift supplier is appointed. These can be used to reserve space during concept design, but they should not be treated as final construction dimensions.
4.1 Accessibility reference dimensions
The Government of India’s 2016 Harmonised Guidelines and Space Standards for Barrier-Free Built Environment for Persons with Disabilities includes lift-planning guidance with a recommended minimum car size of 1,500 mm × 1,500 mm, a clear door opening of at least 900 mm, and associated accessibility provisions. The document is an important historical reference, but current project requirements must be checked against the applicable 2021 Harmonised Guidelines, adopted standards, building regulations, and local rules.
Central Public Works Department
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| Planning item | Reference value | Important qualification |
|---|---|---|
| Accessible lift car | 1,500 × 1,500 mm | Reference from the 2016 accessibility guidance, not a universal minimum for every current project |
| Door clear opening | At least 900 mm | Verify current applicable provisions and the selected lift configuration |
| Lift lobby | Project-specific | Check manoeuvring, approach, queuing, and circulation requirements |
| Call-button location and controls | Accessibility-dependent | Check reach ranges, visual contrast, tactile information, and current guidance |
| Pit and overhead | Manufacturer-specific | Obtain approved general arrangement drawings |
These figures are useful for early discussion, but they do not establish that every lift with those dimensions will satisfy every accessibility requirement.
4.2 Why passenger capacity is not enough
Passenger capacity is normally expressed as a rated load in kilograms and may also be described by the approximate number of passengers.
Two lifts with the same rated load may have different car proportions, entrance widths, shaft requirements, or equipment configurations.
For example, a car intended primarily for standing passengers may be unsuitable for a building that frequently moves wheelchairs, hospital beds, or large equipment. The design brief should therefore identify the intended users and objects, not just the passenger count.
4.3 How to obtain reliable shaft dimensions
Use the following sequence:
- Establish the lift’s intended use and required capacity.
- Determine preliminary car dimensions and entrance requirements.
- Consult the manufacturer’s planning data or elevator-planning tool.
- Check shaft width and depth, counterweight arrangement, and door configuration.
- Confirm pit, overhead, and any machine-room requirements.
- Coordinate the manufacturer’s drawings with the architect and structural engineer.
- Freeze the relevant dimensions only after the design team has reviewed the approved general arrangement drawing.
For preliminary design, tools such as the KONE Elevator Planner can help architects explore initial configurations and dimensional requirements. Final project dimensions must still be confirmed by the selected supplier.
KONE Elevator Planner
5. Types of Lifts and Their Planning Requirements
5.1 Passenger lifts
Used in apartments, offices, hotels, educational institutions, and commercial buildings.
Planning priorities include passenger capacity, traffic demand, car size, entrance arrangement, lobby circulation, and the number of floors served.
5.2 Hospital bed and stretcher lifts
Designed for moving patients on beds or stretchers, along with accompanying staff and equipment.
Planning must consider the actual bed or stretcher dimensions, approach route, turning space, door clear opening, and manoeuvring inside the car.
5.3 Goods and service lifts
Used in warehouses, factories, hotels, hospitals, retail buildings, and service areas.
Dimensions should reflect the largest loads, trolley or pallet geometry, loading method, floor loading conditions, and operational workflow.
5.4 Residential and domestic lifts
Used in private houses, villas, and low-rise residential projects.
Space constraints may influence the drive system, shaft arrangement, car dimensions, landing configuration, and maintenance access.
5.5 Machine-room-less lifts
MRL lifts eliminate the need for a conventional separate machine room in many configurations.
The architect must still accommodate the required overhead, pit, equipment access, electrical provisions, and installation clearances.
Lift type comparison
| Lift type | Primary design concern | Typical application |
|---|---|---|
| Passenger | Traffic handling and user comfort | Residential and commercial buildings |
| Accessible passenger | Independent access and usable car geometry | Public and accessible buildings |
| Hospital bed | Bed or stretcher movement and patient transfer | Hospitals and healthcare facilities |
| Goods | Load, dimensions of goods, and loading operations | Industrial and commercial buildings |
| Service | Operational circulation and separation from public movement where needed | Hotels, hospitals, and large facilities |
| Residential | Limited footprint and domestic usability | Houses and low-rise residences |
The categories can overlap. For example, a passenger lift may also need to be accessible, while a service lift may be designed to transport bulky goods.
6. Lift Arrangement in Building Planning
Lift arrangement determines how people reach the lifts, wait for them, enter the cars, and continue to other parts of the building.
The best arrangement depends on the floor plan, expected traffic, number of lifts, building function, and relationship between public and service circulation.
6.1 Single-lift arrangement
A single lift is commonly placed close to a staircase and the principal circulation route.
It can suit smaller buildings with relatively modest vertical transportation demand, subject to the applicable requirements and operational brief.
The architect should also consider the consequences of a single lift being unavailable for maintenance or breakdown.
6.2 Side-by-side arrangement
In this configuration, two or more lifts are positioned adjacent to each other.
Advantages:
- A compact and legible lift core.
- Convenient wayfinding.
- Potentially efficient use of a shared lobby.
- Straightforward coordination of adjacent lift entrances.
Planning concern: The lobby must provide sufficient space for queues without obstructing the main corridor, stair access, or accessible routes.
6.3 Opposite arrangement
Lifts are positioned on opposing sides of a lobby or corridor.
This arrangement may provide convenient access from different sides of a circulation space, but the clear distance between entrances must be carefully planned.
A lobby that is too narrow can create congestion, interfere with door approaches, and make wheelchair manoeuvring difficult.
6.4 Grouped or bank arrangement
Several lifts are grouped into a common bank, often in offices, hotels, hospitals, and large residential buildings.
Lift banks should be evaluated with traffic analysis rather than simply counting the number of cars. For larger systems, destination control or other group-control strategies may affect how passengers distribute themselves across the bank.
6.5 Service lift separation
Where operational requirements justify it, service lifts can be placed near loading, housekeeping, storage, or back-of-house circulation.
This can reduce conflicts between public movement and service activities. In healthcare and hospitality projects, the arrangement should respond to the actual operational brief and applicable hygiene, fire-safety, and circulation requirements.
7. Lift Lobby Dimensions and Circulation
The lobby is one of the most easily underestimated parts of a lift core.
A successful lift lobby must support three activities: approaching the lift, waiting for it, and leaving it without blocking other users.
Key planning considerations
- Maintain a clear approach to every landing door.
- Provide sufficient room for waiting passengers.
- Check wheelchair turning and manoeuvring space against applicable accessibility guidance.
- Avoid placing furniture, display units, or door swings in required circulation areas.
- Coordinate the lobby with the staircase, corridor, entrance, and refuge or fire-safety provisions where applicable.
- Consider whether the lobby is also used as a major pedestrian route.
- Check door positions, landing indicators, signage, and visibility.
- Account for peak periods such as office arrival, lunch breaks, hospital visiting hours, or hotel check-in.
How should lobby width be determined?
Lobby width should not be determined using a single multiplier alone. A preliminary geometric relationship can be useful, but it does not replace a circulation and traffic assessment.
The design team should consider:
- The number and arrangement of lift entrances.
- The depth of the lift cars and the position of their doors.
- The expected number of waiting passengers.
- The movement of people passing through the lobby.
- Wheelchair, trolley, stretcher, or luggage manoeuvring.
- Applicable accessibility and fire-safety requirements.
For a high-traffic building, the final arrangement should be checked against a lift traffic analysis or supplier’s design recommendation.
8. Lift Planning for Different Building Types
| Building type | Important planning considerations |
|---|---|
| Apartments | Resident demand, visitor movement, accessible access, service and maintenance requirements |
| Offices | Peak-hour traffic, destination control where appropriate, lobby queuing, passenger distribution |
| Hotels | Guest luggage, housekeeping movement, service routes, separation of guest and back-of-house circulation where appropriate |
| Hospitals | Patient transfer, bed and stretcher geometry, clinical access, service circulation, operational continuity |
| Shopping centres | Public access, goods handling, trolley movement, integration with escalators and major pedestrian routes |
| Educational buildings | Class-change peaks, accessible movement, student circulation, evacuation and fire-safety planning |
| Industrial buildings | Load dimensions, loading platforms, material handling, durability, operational workflow |
| Parking structures | Connection to pedestrian entrances, accessible parking, wayfinding, and secure circulation |
Example: Lift planning in an office building
Consider an office building with a central core, multiple occupied floors, and concentrated arrival during morning hours.
A reasonable planning process would be to:
- Estimate the population served by each lift group.
- Assess peak arrival and departure patterns.
- Determine the required handling capacity and acceptable waiting performance.
- Select a preliminary number and type of lifts.
- Compare side-by-side and grouped arrangements.
- Reserve space for the shafts, lobby, and associated equipment.
- Validate the proposal through a traffic analysis and manufacturer coordination.
This process is more reliable than selecting the number of lifts solely from the building’s floor count.
9. Structural Coordination of Lift Shafts
Lift shafts must be coordinated with the structural system before the architectural plans are frozen.
Changes to shaft size or position can affect beams, slabs, columns, retaining walls, foundations, and the arrangement of services around the core.
9.1 Coordinate the shaft with the structural grid
The architect should review the proposed shaft location against:
- Column positions and structural grid lines.
- Beam locations and soffit levels.
- Slab openings and edge reinforcement requirements.
- Core walls and supporting elements.
- Basement retaining walls and foundations.
- Roof structure and overhead clearances.
- Any proposed transfer structures or irregular framing conditions.
Do not assume that beams can be cut or displaced to accommodate a lift. Any structural modification must be designed and approved by the responsible structural engineer.
9.2 Confirm structural loads
The lift supplier should provide the applicable loads and support requirements for the selected equipment. These may include loads transferred through guide-rail brackets, machine supports, buffers, and other components.
The structural engineer should use the supplier’s verified information to design the supporting elements.
9.3 Coordinate the pit
The pit can conflict with foundation elements, basement waterproofing, drainage, or underground services.
Review the pit in section and in relation to the foundation plan. Confirm the required depth, waterproofing approach, access and maintenance requirements, and any permitted drainage arrangements with the relevant specialists.
9.4 Coordinate landing entrances
The door opening, sill support, lintel or supporting construction, finished floor level, and entrance recess must match the approved lift drawings.
A small mismatch between the architectural opening and the manufacturer’s frame dimensions can lead to avoidable construction changes.
10. General Arrangement (GA) Drawings for Lifts
The lift manufacturer’s general arrangement drawing is one of the most important documents in the coordination process.
It translates the selected lift system into the dimensional and technical information needed by the architect, structural engineer, and building-services team.
Information to check on a lift GA drawing
- Lift identification and rated load.
- Car dimensions and entrance arrangement.
- Clear shaft width and depth.
- Landing-door sizes and locations.
- Pit depth and relevant reference levels.
- Overhead clearance and top-floor requirements.
- Machine-room requirements, if any.
- Guide-rail and equipment support positions.
- Loads acting on the building structure.
- Electrical and other service requirements.
- Maintenance and installation access.
- Required openings, recesses, and builder’s work.
Coordination workflow
1. Architectural concept
Define building use, circulation, preliminary lift location and capacity.
2. Preliminary lift selection
Consult the lift supplier and reserve preliminary shaft, pit and overhead space.
3. Manufacturer’s GA drawing
Confirm equipment dimensions, clearances, openings and structural loads.
4. Multidisciplinary coordination
Coordinate architecture, structure, electrical services, fire safety and accessibility.
5. Approved construction drawings
Issue coordinated drawings after the responsible teams have resolved dimensional conflicts.
The architect should not issue final shaft dimensions for construction based only on a generic reference table or preliminary sales brochure.
11. Accessibility and Safety Considerations
Accessible lift planning should be addressed from the beginning of the design process rather than added after the core has been finalized.
In India, the Harmonised Guidelines and Standards for Universal Accessibility in India 2021 is an important government reference. The National Building Code of India 2016 also provides a national framework covering building services, fire and life safety, and accessibility-related provisions. The applicable rules and adopted requirements must be confirmed for the specific project.
India
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Accessible design checklist
- Provide an accessible route to the lift from the relevant building entrance and occupied floors.
- Verify the car dimensions and clear entrance opening against the applicable requirements.
- Ensure that the landing provides adequate approach and manoeuvring space.
- Coordinate controls and call buttons for reach and usability.
- Include appropriate tactile, visual, and audible information as required.
- Review level differences and gaps at the landing threshold.
- Provide clear signage and wayfinding.
- Consider users with wheelchairs, mobility aids, visual impairments, and hearing impairments.
- Confirm emergency communication and safety provisions with the relevant specialists.
Fire safety is a separate design consideration
An ordinary passenger lift should not automatically be treated as an evacuation lift or firefighting lift. Such functions require appropriate design, equipment, protection, power provisions, and compliance with the applicable regulations.
Coordinate lift requirements with the fire strategy, building classification, height, occupancy, and local authority requirements. The lift design must not obstruct required exit routes or compromise the intended operation of protected stairs and other life-safety systems.
12. Common Lift Planning Mistakes
| Mistake | Possible consequence | Better practice |
|---|---|---|
| Fixing the shaft before consulting a supplier | Insufficient clearance or major redesign | Reserve preliminary space, then verify against the selected lift |
| Treating car size as shaft size | Equipment cannot fit | Show car, shaft, and structural enclosure as separate dimensions |
| Ignoring pit depth | Foundation or basement conflicts | Coordinate pit and foundation sections early |
| Underestimating overhead | Roof-level or equipment conflicts | Check the manufacturer’s required overhead and reference levels |
| Planning only for passenger capacity | Poor usability for wheelchairs, beds, or goods | Define the intended users and objects |
| Making the lobby too narrow | Congestion and inaccessible approaches | Check queuing, turning, and through-circulation |
| Ignoring structural loads | Unsuitable supports or late structural changes | Obtain equipment loads and support details from the supplier |
| Omitting service coordination | Conflicts with ducts, conduits, or other services | Coordinate all relevant drawings before construction |
| Assuming MRL means no special space is needed | Inadequate access or clearances | Follow the exact selected system’s requirements |
| Treating a generic dimension as a statutory minimum | Non-compliant or unbuildable design | Verify the current standard, regulations, and approved GA |
13. Practical Lift Planning Checklist for Architects
Use this checklist during preliminary design and multidisciplinary coordination.
[ ] Confirm the building use and intended lift functions.
[ ] Estimate the population served and assess lift traffic.
[ ] Establish preliminary car capacity and entrance requirements.
[ ] Reserve a preliminary shaft location and footprint.
[ ] Check the relationship between lifts, stairs and corridors.
[ ] Review accessibility, stretcher or goods movement where applicable.
[ ] Obtain preliminary planning information from the lift supplier.
[ ] Confirm shaft dimensions, pit depth and overhead clearance.
[ ] Coordinate shaft position with columns, beams, slabs and foundations.
[ ] Confirm equipment loads and supporting requirements with the structural engineer.
[ ] Coordinate electrical supply, controls and other required services.
[ ] Check landing levels, door openings, sills and finished floor levels.
[ ] Review applicable building, accessibility and fire-safety requirements.
[ ] Obtain and coordinate the manufacturer’s GA drawings.
[ ] Resolve discrepancies before issuing construction drawings.
14. Frequently Asked Questions
1. What is lift planning in architecture?
Lift planning is the process of selecting and locating lifts while coordinating their capacity, dimensions, entrances, shaft, pit, overhead, lobby, structure, accessibility, and building services. The objective is to provide safe and convenient vertical circulation that meets the building’s operational and regulatory requirements.
2. What are the standard dimensions of a lift shaft?
There is no single universal shaft size. Dimensions depend on the lift capacity, car geometry, door arrangement, counterweight, drive system, speed, and manufacturer. Use preliminary planning dimensions only to reserve space, then confirm the exact requirements using the selected manufacturer’s approved general arrangement drawing.
3. What is the difference between lift car size and shaft size?
Lift car size refers to the internal usable dimensions of the passenger or goods compartment. Shaft size refers to the clear internal dimensions of the vertical enclosure that accommodates the car and its associated equipment. The shaft is not simply the car’s width and depth plus a fixed allowance.
4. How deep should a lift pit be?
Pit depth varies according to the lift system, rated speed, equipment, safety clearances, and applicable standards. It must be obtained from the selected manufacturer’s planning drawings. The architect and structural engineer should coordinate the pit with foundations, waterproofing, and underground services before construction.
5. What is lift overhead clearance?
Lift overhead clearance is the required vertical space above the uppermost landing for the car and its associated equipment and safety provisions. The exact requirement depends on the equipment and should be measured using the manufacturer’s specified reference levels.
6. How wide should a lift lobby be?
Lobby width depends on the arrangement and number of lifts, passenger traffic, waiting space, circulation, accessibility, and applicable fire-safety requirements. It should not be based solely on a generic width multiplier. High-traffic buildings may require lift traffic analysis.
7. What is a machine-room-less lift?
A machine-room-less lift is a system that does not require a conventional separate machine room. Its equipment is accommodated within the lift installation or designated spaces. Shaft, pit, overhead, access, electrical, and maintenance requirements still depend on the chosen manufacturer and system.
8. Which Indian standards and regulations should architects check?
The National Building Code of India 2016, including Part 8, Section 5A on lifts, is an important national reference, along with applicable Indian Standards, state lift legislation and rules, accessibility guidance, and local building and fire-safety requirements. The responsible design team should verify the current editions, amendments, and statutory applicability for each project.
9. Can lift shaft dimensions be changed after structural drawings are issued?
They can sometimes be changed, but the change requires coordinated review. It may affect the shaft enclosure, beams, slabs, foundations, equipment clearances, landing doors, and approvals. The lift supplier and structural engineer must confirm that the revised design is feasible before the change is implemented.
10. What is a lift GA drawing?
A lift general arrangement drawing is a manufacturer-prepared technical drawing showing the principal dimensions, car and shaft layout, entrance configuration, pit, overhead, equipment arrangement, and relevant building interfaces. It provides essential information for architectural and structural coordination before construction.
Conclusion
Lift planning is a multidisciplinary architectural task that connects vertical circulation, building-core design, accessibility, structure, and building services. A well-planned lift system is not simply one that fits inside a shaft; it must also work effectively within the building’s circulation and operational requirements.
Architects should begin by defining the building’s intended use and traffic needs, reserve appropriate preliminary space, and coordinate with the lift manufacturer and structural engineer early. Final dimensions for the car, shaft, pit, overhead, and entrances should be based on approved equipment drawings and verified against the applicable standards and regulations.
For architecture students, understanding these relationships provides a stronger foundation for working drawings. For practicing professionals, early coordination helps reduce redesign, construction conflicts, and avoidable delays.