IN Brief:
- Wolffkran tower cranes are supporting the redevelopment of 1 Victoria Street in Westminster.
- The scheme will retain 52% of the original 1960s structure and reuse existing foundations.
- The crane strategy uses adaptable cross-frame bases, irregular leg lengths, and planned basement dismantling methods.
Wolffkran is supporting the redevelopment of 1 Victoria Street in Westminster with a tower crane strategy designed around retained structure, reused foundations, and restricted central London working conditions.
The project is transforming a former 1960s office block into a modern low-carbon workplace close to the Palace of Westminster and Westminster Abbey. When complete, the scheme will provide office accommodation and active ground-floor retail, with occupation planned for early 2028.
The development is retaining 52% of the original structure and reusing the existing foundations, reducing the need for new piling and helping lower embodied carbon. That retention-led strategy has also created a demanding crane planning exercise, with tower positions shaped by legacy bearing points, basement constraints, retained structural elements, and the sequence of demolition and new construction.
Wolffkran has deployed its WOLFF cross-frame system to accommodate irregular support conditions. The system allows each of the four legs to be extended to different lengths, ranging between six and ten metres. On one crane base, four different leg lengths were required to align with available support points.
The crane tower was also rotated to suit the existing foundations below. This kind of adjustment is increasingly important on retrofit schemes, where the structure beneath the crane is not being designed from scratch and the lifting strategy has to adapt to inherited conditions.
The dismantling sequence will be unusually constrained. Basement slabs are being cast close to the crane tower, enclosing the cruciform and ballast in a way that prevents conventional removal by mobile crane. Wolffkran plans to use ceiling hoists, low-level forklifts, and skating systems to remove central ballast blocks and cross-frame components within limited headroom.
As more commercial developments prioritise structural retention, tower crane planning is becoming more closely tied to carbon strategy. Retaining frames and foundations can reduce embodied carbon, shorten some approval routes, and preserve parts of an existing asset, but the construction phase often becomes more complicated than a cleared-site new build.
Older buildings were not designed around modern crane bases, façade replacement, high-capacity building services, new cores, current fire strategies, or low-carbon refurbishment standards. Existing foundations may not align with crane loading requirements, basements may restrict access, and retained structures may need strengthening before temporary works loads can be accepted.
Central London adds a further layer of constraint. Crane positions must be planned around highways, neighbouring buildings, underground assets, party walls, protected views, pedestrian routes, delivery access, oversailing restrictions, and emergency arrangements. A tower crane is not simply plant on site; it becomes part of the engineering, logistics, and risk strategy for the whole development.
The 1 Victoria Street scheme sits within a wider movement toward retrofit-led commercial redevelopment. Developers are under pressure to improve energy performance and workplace quality while reducing the carbon associated with demolition and replacement. That often means retaining a meaningful proportion of the original building while replacing façades, services, entrances, roof plant, cores, and public-facing areas.
Specialist plant suppliers are being drawn earlier into these projects because crane decisions influence the feasibility of the construction sequence. The crane must be erectable, climbable, operational, serviceable, and removable within the changing geometry of the site. If removal has not been considered from the start, a successful lift strategy can still leave a late-stage problem in the basement.
Equipment support is also moving into a more digital, planned environment. Recent developments such as AI-supported parts identification for cranes and foundation machines show how uptime, service response, and technical support are becoming more closely linked to site productivity.
For 1 Victoria Street, the crane package supports the central delivery challenge: keeping enough of the existing building to achieve the carbon and planning benefits while still creating a buildable sequence for demolition, new structure, façade work, services installation, and fit-out.
The project demonstrates how tower crane engineering has moved beyond standard capacity and reach calculations on constrained retrofit schemes. In dense urban redevelopment, the crane strategy can determine whether structural retention remains practical once design intent meets basement geometry, foundation limits, and the physical realities of site delivery.
