Project managers regularly face this decision: do we need a boom lift or a crane? The two machines serve different purposes, but there is a grey zone where either could work. Choosing wrong in that grey zone costs real money in wasted hire fees, lost time, and project delays.
This guide draws a clear line between boom lift territory and crane territory, and covers the scenarios where neither machine is the right answer.
What Each Machine Does Best
A boom lift positions people at height. The platform carries workers, tools, and light materials to an elevated work area. The operator controls the platform position and performs the work at height. The machine stays on site for the duration of the task, moving between work positions as needed.
A crane lifts and moves heavy loads. The hook carries steel, precast panels, mechanical plant, and other heavy items from ground level to an elevated position. A rigger or dogman guides the load, and the crane operator controls the lift from the cabin. Once the load is placed, the crane moves to the next lift.
The core difference: boom lifts carry people to the work. Cranes carry materials to the placement point. When people confuse these functions, projects get expensive.
When a Boom Lift Is the Right Choice
Personnel Positioning for Extended Work
Any task where a worker needs to spend minutes or hours at an elevated position is boom lift work. Welding steel connections, bolting structural members, installing cladding, running cables, painting, inspecting, and repairing are all tasks where the worker stays at height and needs a stable platform with guardrails, tool storage, and controlled positioning.
A crane cannot do this. Suspending a worker in a man-cage from a crane hook is legally restricted in Australia to situations where no other means of access exists. It requires specific risk assessments, engineering certification of the cage, and approval from the site safety manager. It is a last resort, not a standard access method.
For routine height access, a boom lift is the compliant, practical, and cost-effective option.
Multi-Position Work Across a Structure
When the work involves accessing multiple points across a building facade, roof edge, or structural frame, a boom lift provides mobile access. The operator repositions the machine between work points without any rigging, setup, or waiting for a crane crew.
A crane serving the same function would need to slew to each position, a rigger would need to attach and detach a man-cage at each point, and the work pace would slow dramatically. For multi-position access work, boom lifts are faster by a factor of three to five times.
Jobs Under 500kg Platform Load
Boom lift platform capacities typically range from 230kg to 450kg. That covers two workers with full PPE and a reasonable toolkit. If the total load at height stays within this range, a boom lift handles it.
Once the load requirement exceeds what a boom lift platform can carry, you are moving into crane territory.
When a Crane Is the Right Choice
Heavy Material Placement
Steel beams, precast concrete panels, mechanical plant (HVAC units, generators, cooling towers), and other heavy components need a crane. These items weigh hundreds or thousands of kilograms and cannot be carried on a boom lift platform.
A standard mobile crane in the 20-tonne to 50-tonne class handles most commercial construction lifts. Larger projects with heavier components may require 100-tonne or 200-tonne cranes. The crane places the load at the designated position, the rigging crew detaches, and the crane moves to the next lift.
Single-Point Lifts With Precise Placement
Cranes excel at picking up a load from one location and placing it precisely at another. Setting structural steel on columns, positioning rooftop plant on plinths, or lowering equipment into excavations are all single-point lift tasks that require the load control and capacity of a crane.
Working Over Extended Distances
Large tower cranes and mobile cranes with long booms can reach across entire building footprints. A boom lift, even a large telescopic boom, has a maximum horizontal outreach of around 20m to 25m. A crane can reach 50m or more, depending on the configuration.
For lifts that require coverage across a large site from a single setup position, a crane is the only option.
The Grey Zone: Where Either Could Work
Some tasks sit between boom lift and crane territory. Getting this decision right saves thousands.
Lifting Light Materials to Roof Level
Boxes of fixings, bundles of conduit, stacks of flashing, and other light materials sometimes need to go from ground level to a roof or upper floor. A crane can do this, but mobilising a crane for a few hundred kilograms of materials is expensive overkill.
A boom lift with sufficient platform capacity can carry light loads to height. The operator loads the materials onto the platform at ground level, elevates, and passes them to the crew at the work level. For loads under 200kg, this is faster and cheaper than a crane lift.
The limit is the platform capacity. If the materials plus the operator exceed the boom lift rated load, you need a crane or a material hoist.
Installing Signage, Antennas, or Small Plant
Rooftop antenna installations, building signage, and small mechanical units (split system condensers, exhaust fans) often weigh 50kg to 150kg. A boom lift can carry these items on the platform if the total load stays within capacity.
The advantage of using a boom lift for this work is that the installer rides up with the item, positions it, and fixes it in place without needing a separate rigging crew. With a crane, you need the crane operator, a rigger, a dogman, and often a spotter. The labour cost alone makes the crane option two to three times more expensive for small installations.
Steel Connection Work
After a crane places a steel beam on its columns, someone needs to bolt or weld the connection. This is boom lift work. But on small steel erection jobs, some builders try to use the crane to position the ironworker in a man-cage for the connection work, avoiding the cost of a separate boom lift.
This approach is slower (the crane is tied up holding the man-cage instead of making lifts), riskier (man-cage operations have strict regulatory requirements), and often more expensive overall. Booking a boom lift for connection work frees the crane to keep making lifts, which keeps the project on schedule.
The Cost Comparison
Hire rates vary by machine size and duration, but here is a general comparison for typical Sydney projects:
| Item | Boom Lift | Mobile Crane (20T) |
|---|---|---|
| Daily hire rate | 00 to 00 | ,500 to ,000 |
| Operator (if required) | Often self-operated | Mandatory (crane operator) |
| Rigging crew | Not required | 1 to 2 riggers required |
| Setup time | 15 to 30 minutes | 30 minutes to 2 hours |
| Mobilisation/demobilisation | 00 to 00 | 00 to ,500 |
| Minimum hire | Half day | Half day to full day |
For personnel access work, a boom lift costs roughly one-quarter to one-third of a crane on a daily basis. The savings compound over multi-day hires.
For heavy lifting, the crane cost is justified because no other machine can do the job. But if you are hiring a crane purely for personnel access because “we already have it on site,” you are paying crane rates for boom lift work.
When Neither Machine Is Right
Sustained Facade Work Over Weeks or Months
Long-duration facade work (cladding, rendering, painting, waterproofing) across a large building face is neither boom lift nor crane territory. Both machines would need to be on site for weeks, and a boom lift can only access one position at a time.
For this work, a mast climber or scaffold system provides a continuous working platform across the building face. Multiple workers can operate simultaneously across the platform, and the system stays in place for the full project duration. The setup cost is higher than a boom lift, but the productivity gain over a multi-week project makes it the cheaper option overall.
Indoor Overhead Work at Moderate Heights
For indoor ceiling work at 4m to 12m, neither a boom lift nor a crane is the most cost-effective option. A scissor lift provides vertical access at a lower hire cost, with a smaller footprint and simpler operation. Boom lifts are only needed indoors when the work position is offset from where the machine can be placed.
Repetitive Material Lifts to the Same Level
If you need to move materials from ground level to the same floor or roof level repeatedly throughout the day, a material hoist or construction elevator is more efficient than either a boom lift or a crane. Both machines tie up an operator and an expensive piece of equipment for what is essentially a vertical transport task.
Making the Right Call
Before booking either machine, answer these questions:
- What is the primary task? Positioning people at height = boom lift. Lifting heavy materials = crane. Both = you may need both.
- What is the load weight? Under 300kg including the operator = boom lift. Over 500kg = crane. Between 300kg and 500kg = check the specific boom lift platform capacity.
- How long will the machine be needed at each position? Minutes to hours of sustained work = boom lift. Single lifts measured in minutes = crane.
- Is the work at multiple positions or one location? Multiple positions across the structure = boom lift (mobile). Single fixed position = either could work, compare costs.
If your next project involves height access and you are not sure whether a boom lift or crane is the right call, contact Power Access. We can assess your job requirements and recommend the right boom lift configuration, or let you know when a different solution makes more sense.