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Building Requirements for Overhead Cranes: What You Need to Know

Author:
Granada Cranes
Specialist Installation: 5 Ton Overhead Gantry Crane Inside a Soundproof Cell

What you need to know before specifying a crane – from small workshops to large industrial facilities

What This Guide Covers


Structural capacity

Headroom & lifting height

Power supply

New build vs existing

Whether you’re planning a crane for a small engineering workshop or a large aerospace facility, getting the building requirements right from the start is essential. The wrong assumptions can lead to costly modifications, reduced capacity, or discovering the crane you need simply won’t fit.

Why Building Requirements Matter

An overhead crane transfers significant loads through your building every time it lifts, travels, and brakes. Understanding your building’s capabilities early helps you:

Specify the right crane for your environment

Avoid expensive structural modifications

Maximise lifting height and coverage

Plan realistic budgets and timescales

Structural Capacity: Can Your Building Take the Load?

This is the most fundamental question. Your building structure needs to handle multiple force types:

Dead Load
Weight of crane bridge, end carriages, and hoist
Live Load
Maximum lifted load (Safe Working Load)
Horizontal Forces
From travel, trolley movement, and braking
Dynamic Forces
Impact and vibration during operation

Requirements by Crane Capacity



Small Workshops

Up to 3 Tonnes

Lighter structural requirements, but still need proper assessment.

  • Standard portal frame may be adequate
  • Check column strength and connections
  • Verify foundation adequacy
  • Consider free-standing if building can’t support
Typical: Engineering shops, maintenance bays, small fabricators



Medium Facilities

3–20 Tonnes

Buildings typically purpose-designed or require structural assessment.

  • Structural engineer assessment required
  • Crane load data from supplier essential
  • Runway beams sized for specific loads
  • Foundation design or verification needed
Typical: Fabrication shops, manufacturing, warehousing



Heavy Industrial

20+ Tonnes

Buildings specifically designed around crane requirements.

  • Building designed around the crane
  • Independent crane columns common
  • Heavy-duty runway beams (plate girders)
  • Specific foundation design required

Headroom and Lifting Height

The available height in your building directly affects useful lift. Understanding the relationship between building height and hook height is crucial.

Key Vertical Dimensions

Crane headroom dimensions diagram

1

Height to underside of roof
Clear height before obstructions

2

Runway beam depth
Varies by span and load

3

Crane bridge height
Vertical space the crane occupies

4

Hoist headroom
Rail to hook at highest position

5

Useful hook height
Actual lift available above floor

Limited Headroom? Here Are Your Options

Low headroom hoistsMinimise distance between rail and hook

Single girder cranesHoist runs on bottom flange, uses less vertical space

Underslung cranesCrane runs beneath runway beams

Optimised runway positioningBalance hook height with clearance above crane

Read more: Overhead crane installations with low headroom challenges

Span and Coverage

The span (distance between runway rails) determines width of coverage and needs to work with your building’s column layout.

Small to Medium Spans

Up to 15m

Typical of workshops, maintenance facilities, smaller manufacturing. Single girder cranes often most cost-effective for capacities up to 10 tonnes.

Large Spans

15m – 30m+

Common in larger facilities, warehouses, aerospace hangars. Double girder designs typically required. For very large spans, consider Goliath cranes.

When to Consider Free-Standing Systems

Not every building can support an overhead crane from its structure. Free-standing systems transfer loads directly to the floor instead.

Consider Free-Standing When:


Existing structure can’t support crane loads

Structural reinforcement cost is prohibitive

Crane needed in only part of the building

Building is leased – modifications not permitted

Future relocation anticipated

Recent Project

Free-Standing Solution in Stockport

We recently installed a bespoke 5-tonne free-standing gantry system for a plastic injection moulding manufacturer, where the crane needed to serve a specific machine without requiring building modifications.

View case study

Important: Free-standing systems transfer concentrated loads through their legs into the floor slab. A structural assessment of the floor is essential – just as a building assessment is needed for a structure-mounted crane.

Power Supply Requirements

Overhead cranes require electrical power for hoist, bridge travel, and trolley motors. Your building needs adequate supply at the right location.

Crane Type Typical Supply Notes
Light duty
Up to 3 tonnes		 415V 3-phase
16–32A		 Standard industrial supply often sufficient
Medium duty
3–20 tonnes		 415V 3-phase
32–63A		 Dedicated supply usually required
Heavy duty
20+ tonnes		 415V 3-phase
63A+		 May require supply upgrade

Power Distribution Methods

Festoon CableCables suspended from trolley system – common for shorter travel distances

Conductor BarEnclosed rails with sliding collectors – higher duty, longer travel

Cable ReelsMotorised drums that pay out and retract – specific applications

New Build vs Existing Building

New Build

Design Around the Crane

You have the opportunity to optimise everything:

  • Column spacing matched to crane span
  • Building height designed for desired hook height
  • Structural design incorporates crane loads
  • Foundations designed for crane loads
  • Power supply specified correctly
  • Services routed to avoid conflicts
Tip: Involve your crane supplier early – we provide load data and guidance to architects and structural engineers during design.

Existing Building

Work With What You Have

Requires careful assessment of what’s already there:

  • Structural survey to determine capacity
  • Identify modifications needed
  • Work within fixed dimensions
  • Coordinate with existing services
  • May need to accept compromises
  • Free-standing may be the solution
Tip: Sometimes an existing building can’t accommodate your ideal crane. A free-standing system or alternative solution may be the answer.

Industry-Specific Considerations

Aerospace

Large spans for airframe handling, high bays, precision control, anti-collision systems, multiple cranes in same facility.

Automotive

High duty cycles, production line coordination, fast travel speeds, tandem lifting for vehicle bodies.

Steel Fabrication

Heavy lifting, demanding duty cycles, combined with manipulators and welding, magnetic/vacuum attachments.

Warehousing

Long spans for storage areas, clear height for racking, lower duty cycles but full building coverage needed.

Food & Pharma

Hygiene requirements, stainless steel construction, sealed components, washdown capability, cleanroom specs.

Timber & Sawmill

Outdoor or semi-enclosed environments, long loads, robust construction, weather protection for components.

Often Overlooked: Access Requirements

Installation Access

  • Will bridge beams fit through doors?
  • Space for mobile cranes outside?
  • Overhead obstructions to work around?
  • Can crane erect itself in sections?

Maintenance Access

  • Safe access to runway level
  • Walkways for larger installations
  • Access to bridge and hoist
  • Space to isolate and work safely

Throughout the crane’s life, engineers need access for servicing, LOLER inspections, and repairs. Plan for this from the start.

What We Provide

At Granada Cranes, we support you through the entire process:

Site Surveys
Assess existing buildings

Load Data
For structural engineers

CAD Drawings
Coordination with building design

Guidance
Best crane for your building

Full Service
Design, manufacture, install

Quick Summary

1

Structural capacity is fundamental – your building must handle dead loads, live loads, and dynamic forces.

2

Requirements scale significantly from small workshops (up to 3t) through to heavy industrial (20t+).

3

Headroom matters – understand the relationship between building height and useful hook height.

4

Free-standing systems are the solution when buildings can’t support structure-mounted cranes.

5

Involve your crane supplier early – whether new build or existing, we can help get it right.

Planning a Crane Installation?

Whether you’re working with an existing building or designing a new facility, our team can advise on the right crane solution for your requirements.

Discuss Your Project

Or call us: 0800 376 27 27

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