Battersea Power Station:
A Three-Phase
Substructure Journey

Battersea Power Station is not a single project — it is a multi-phase urban regeneration programme spanning the best part of a decade, involving multiple contractors, multiple phases, and multiple concrete packages. Delivering on it required something that is rarer in construction than it should be: consistency across time.

The Challenge: A Decade-Long Programme

One of the most challenging aspects of a project as long-running as Battersea Power Station is maintaining quality and consistency across phases that may be separated by years. The concrete team working on Phase 1 in 2013 was not necessarily the same team working on Phase 3 in 2019. The specifications may have been updated. The concrete supply partner may have changed. The main contractor's site management team certainly would have rotated multiple times.

What Prop Builders brought to the Battersea programme was a consistent methodology — a set of standards for supervision, placement, and finishing that did not vary from phase to phase. When our team walked onto Phase 3, they brought the same approach that had delivered Phase 1. That consistency is what the main contractor's programme team valued most.

Phase 1: The Underground Car Park Structure

The first phase of the Battersea Power Station concrete package involved the primary underground car park structure — a multi-level reinforced concrete frame that occupied the footprint of the development's central basement area. This phase presented the specific challenges of urban basement construction: working in close proximity to the listed power station buildings, managing groundwater from the Thames terrace Gravels, and coordinating with the extensive MEP substructure that ran through the slab.

The concrete specification for the basement was a C40/50 watertight concrete, with a Type B (structurally integral) waterproofing strategy using a permeability-reducing crystalline admixture. The construction joints were detailed with PVC waterstops, and the interface between the waterproofing specialist's membrane application and our concrete placing was managed through a joint inspection protocol agreed at the pre-construction stage.

For the placing crew, the principal challenge was access — the car park levels were accessed via temporary ramps that limited the size of the concrete pump that could operate in the basement. We used a boom pump positioned from the perimeter, with flexible hose extensions to reach the pour locations. This required careful positioning of the pump to avoid the temporary propping that occupied much of the basement slab area.

Phase 2: The Chimney Baselines and Turbine Hall Substructures

The second phase extended the concrete package to the areas surrounding the iconic boiler house structures — including the substructures for the new residential towers that would eventually rise above the turbine halls. The turbine hall concrete works demanded particular care: the structures we were building adjacent to were Grade II* listed, and any vibration or ground movement from our operations had to be carefully monitored and controlled.

The concrete specification for the turbine hall zones used a low heat of hydration mix to minimise thermal cracking — a consideration that becomes more important when building next to sensitive historic structures, where differential settlement can have consequences beyond the structural.

The chimney baselines — the reinforced concrete bases for the new structures that would replace the original turbines — required high-volume pours of 300–400m³ per element. We coordinated these pours as separate events, with full road traffic management arrangements and dedicated concrete supply that was pre-positioned before the pour commenced.

Phase 3: High-Rise Residential Towers

The third and final phase of our involvement at Battersea brought jump-form core construction for the new residential towers — a different forming system and a different pace from the basement works of Phases 1 and 2. The towers required jump-form because the programme demanded faster floor-to-floor cycles, and the concrete specification varied with height (lower-strength mixes at upper levels where loads were reduced).

Managing the jump-form cycle against the programme required close daily coordination with the main contractor's site management. Each pour event was a significant operation — typically 180–250m³, requiring the pump, the placing crew, the supervisor, and the PT crew all on site simultaneously. The coordination was managed through a weekly pour programme agreed in advance, with a 48-hour escalation process for any changes.

What Made It Work

The Battersea programme was a study in what long-term relationship contracting can achieve. We were not tendering every phase independently — our performance on Phase 1 generated the trust that secured Phase 2, and Phase 2's delivery of consistent quality without incident secured Phase 3 without competition.

That model — where a specialist concrete contractor is valued not just for the price of the concrete package but for the certainty of the delivery — is something we take into every project. The certainty that your concrete gang will turn up on time, work to the specification, and hand over a structurally sound, well-finished pour on schedule is worth more than the lowest price.

Coordination: The Hidden Skill

On a project the size of Battersea, the concrete works do not happen in isolation. The concrete team is coordinating with reinforcement fixing, PT installation, waterproofing, M&E penetrations, fire stopping, and a dozen other specialist trades in the same space. The supervisor's job is not just managing the pour — it is managing the pour's interface with all of those other activities.

Our supervisors on the Battersea programme were empowered to challenge the programme when other trades were occupying the space required for a safe pour operation. This is not always welcomed by main contractors — it requires a level of commercial confidence to say "we will pour tomorrow, not today, because the space is not safe" — but it is the only way to maintain quality and safety standards on a complex programme. And it is the reason we have never had a structural non-conformance on a Battersea Power Station pour.

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