Choosing between a mobile crane and a tower crane is one of the most consequential decisions in planning the lifting strategy for a construction project. Get it right and you have an efficient, cost-effective lifting operation that supports your programme. Get it wrong and you are either paying for a machine that is significantly over-engineered for the work, or you are struggling with a crane that cannot service the full site and forces you to reorganise the construction sequence around its limitations.
This guide is written for project managers, site managers and commercial managers on London construction projects who need to make this decision with real data. It covers the fundamental differences between the two crane types, the cost implications of each, and a structured way to think through which is right for each common project scenario.
What a Mobile Crane Does Well
A mobile crane arrives on a low-loader, sets up in a defined position, completes its lifts and leaves. The setup and strike process for a mid-size mobile crane typically takes one to two hours each way, meaning the crane can be on site, productive and gone within a single working day for many applications. This flexibility is the mobile crane's defining advantage.
Mobile cranes also cover a wider operating radius from a single position than a tower crane. A 200-tonne all-terrain crane can work at radii of 30 metres or more at meaningful capacities, whereas most tower cranes are sized to cover a specific building footprint and cannot economically cover a wider area without repositioning the base.
The financial model for mobile crane hire is straightforward: you pay for the days you use it. There is no erection cost, no planned maintenance cost over the hire period, no dismantling cost and no long-term commitment. For jobs that are genuinely short-duration, this simplicity is a significant advantage.
What a Tower Crane Does Well
A tower crane is permanently in position above the site. Once erected, it is available for every shift, every day, for the full duration of the hire period. On a high-rise construction programme where the crane is doing 50 to 100 lifts per day, this constant availability is worth more than the erection and hire cost many times over.
Tower cranes also provide lifting coverage over the entire footprint of a building under construction, including the internal areas that are inaccessible to a mobile crane working from the perimeter. When concreting a floor plate or installing internal partitions on upper floors, only a tower crane can deliver materials directly to the point of use without manual handling across the slab.
At height, tower cranes are more productive than mobile cranes. A 200-metre-tall building requires a crane hook height of well over 200 metres. A mobile crane capable of reaching this height is enormous, expensive and requires an outrigger footprint that would occupy a significant portion of a typical London construction site. A tower crane achieves this height through its mast, which occupies a fraction of the space.
Cost Comparison
Mobile Crane Costs
Mobile crane hire costs are built up from a day rate for the machine and operator, a delivery and collection charge, and any additional costs for road closures, fuel and accessories. Day rates for mid-size mobile cranes (40 to 100 tonnes) range broadly depending on specification and availability. There are no upfront capital costs and the cost commitment is limited to the booked hire period.
The main hidden cost in mobile crane hire is programme time. If the mobile crane is needed for five days in a month rather than one continuous week, the mobilisation and demobilisation cost is incurred five times. Programme management to consolidate crane work into continuous run periods reduces overall mobile crane cost significantly.
Tower Crane Costs
Tower crane hire costs are structured differently. The erection cost is a significant upfront charge covering the mobile crane required for erection, the erection crew, the foundation preparation and the first thorough examination. Monthly hire rates then run for the duration of the programme, with an additional dismantling charge at the end.
The monthly hire rate for a tower crane covers the machine, planned maintenance visits and the LOLER inspections required during the hire period. Operator costs are separate and are typically billed weekly or monthly based on the number of shifts worked.
Tower cranes become cost-effective relative to mobile cranes when the programme duration exceeds a threshold that depends on the specific cranes and the frequency of lifts required. On most London high-rise projects of six months or longer with daily lifting requirements, a tower crane is the lower-cost option over the programme period when all crane costs are properly accounted for.
Site Constraints and Access
Site constraints frequently determine crane selection before commercial considerations come into play. In dense urban London, there are many sites where one crane type is simply not practical regardless of its theoretical advantages.
When Site Constraints Favour Mobile Cranes
Sites with poor ground conditions that cannot accept the base load of a tower crane foundation, sites where programme duration is uncertain and committing to a long-term tower crane hire is commercially risky, and sites where the crane will only be needed intermittently for a series of discrete lifts are all cases where a mobile crane is the practical choice.
Retrofit, refurbishment and fit-out projects in existing buildings almost always use mobile cranes because tower crane erection in an occupied or constrained urban environment is rarely practical. Plant replacement, facade replacement and roof installations on existing buildings are mobile crane territory.
When Site Constraints Favour Tower Cranes
High-rise new-build construction is the primary tower crane domain. Once the building exceeds four or five storeys, the operational efficiency of a permanently available overhead crane outweighs the erection and dismantling costs on any programme of significant duration. Sites where multiple lifts per day are required consistently across the programme, where materials need to be placed at height or within the building footprint, and where the construction sequence depends on reliable daily crane availability are all tower crane scenarios.
Sites where a mobile crane would require multiple large road closures for every use, adding time and cost to each deployment, also favour tower cranes. A single tower crane erection road closure is a one-time cost; repeated mobile crane road closures for each delivery accumulate quickly.
Luffing Jib Tower Cranes: A London-Specific Solution
London's density creates a category of site that neither a standard mobile crane nor a conventional tower crane can serve effectively: the highly constrained urban infill plot surrounded by existing buildings. A conventional tower crane's rotating jib would swing over neighbouring properties, requiring expensive and time-consuming oversailing licences or agreements from every affected neighbour. A mobile crane might not have sufficient height reach or might require road closures that are not achievable on that particular street.
The luffing jib tower crane solves this problem. By raising the jib angle rather than rotating at a fixed height, a luffing jib crane can operate within a defined airspace envelope, avoiding the neighbouring properties entirely. This is why luffing jib cranes are the dominant tower crane type on Central London construction sites and on the increasingly common tight infill developments across the inner London boroughs.
Programme Duration: The Deciding Factor
When no site constraints definitively favour one crane type, programme duration is usually the deciding factor. As a broad guide, the crossover point where a tower crane becomes more cost-effective than a mobile crane used on an intermittent basis is typically around four to six months for mid-size construction programmes with regular daily crane use. Below that duration, particularly where crane use is not daily, mobile cranes offer better value. Above that duration with consistent daily crane requirements, tower cranes are almost always the lower total cost solution once erection and dismantling are amortised across the programme.
This analysis changes with project specifics. If the mobile crane requires repeated expensive road closures, the tower crane crossover point comes earlier. If the site is in an outer borough with easy access for mobile cranes and limited programme, mobile crane will remain the better option for longer.
Summary: Choosing the Right Crane for Your Project
Use a mobile crane when: the programme is short or the crane is needed intermittently; the lift is at low to mid height; the site has adequate access and ground conditions; or the work is refurbishment or fit-out in an existing building. Use a tower crane when: the programme is long and crane use is daily; the building is high-rise; materials must be placed within the building footprint; or a mobile crane road closure requirement would be impractical to repeat. Consider a luffing jib tower crane when: the site is surrounded by existing buildings that prevent conventional tower crane operation; airspace constraints restrict the jib rotation arc; or planning conditions make oversailing agreements commercially impractical.
For advice on the right crane for your specific London project, call London Crane Hire for advice from our team or request a free site survey. Our lifting engineers will assess your site and programme and recommend the most practical and cost-effective solution.