Our Capabilities

Civils for energy infrastructure · Pacific Green

Keltbray delivered the full Balance of Plant package for a new battery storage facility, designing and constructing all civil and electrical infrastructure required to bring the site into operation. This included foundations, drainage, access roads, extensive cabling networks, earthworks, and the creation of seven specialist equipment islands with reinforced bases, complex ducting and bespoke containment systems for long term reliability.

Keltbray also delivered the complete electrical scope, from substation works and internal cabling to security systems and final National Grid connection, securing the necessary Environment Agency approvals to build the drainage outfall beside a tidal river.

One of the project's key challenges — installing 30 tonne PCS and BESS units within a tightly constrained site — was overcome through a bespoke lifting solution engineered by Keltbray Lifting, enabling safe, efficient installation without disrupting ongoing works.

Commercial and mixed use · AXA Investment Managers / Yard Nine

Keltbray is delivering a full package of enabling works, demolition, piling, excavation, basement construction, substructure and concrete core works on a highly constrained City of London site bordered by two protected historic structures.

The project involves the safe removal of existing buildings with zero waste to landfill, followed by the excavation of an 81,000m³, 17 metre deep basement just metres from a 400 year old Grade I listed tower — completed without any movement to the heritage asset thanks to advanced modelling and real time monitoring.

Our in house engineering team designed bespoke temporary works to maintain stability throughout demolition and excavation, while heritage elements such as the crypt were carefully removed for restoration and the tower was fully supported to allow construction beneath and around it.

Commercial and mixed use · Mitsubishi Estate Property London and Stanhope PLC

1 Victoria Street was ready for renewal, and Keltbray approached its remodelling with a clear focus: retain value, minimise waste and give the building a responsible second life. Guided by circular economy principles, we looked for reuse opportunities at every turn — recovering thousands of floor tiles, dismantling nearly 2,000 windows and diverting more than 110 tonnes of glass into high quality recycling streams.

The structural transformation was carried out with the same care: lifts removed, floors taken down in sequence and the building sensitively opened for its next purpose.

More than 50,000 items — from furniture to fixtures — were donated to local community groups, creating direct social value. Partnerships like our closed loop recycling initiative with Saint Gobain ensured reclaimed materials were not only diverted from waste, but turned into new products.

Commercial and mixed use · City of London Corporation

Keltbray delivered one of its largest schemes to date at Salisbury Square — the new headquarters for the City of London Police and a landmark £600 million development in the heart of the Square Mile. The project spans an area four times the size of St Paul's Cathedral and includes an 18 metre deep basement designed to accommodate specialist policing facilities.

The scale and complexity of the works demanded tight coordination and a fully integrated delivery approach. By combining our in house structural, temporary works, concrete, and logistics capabilities, we maintained programme certainty while embedding circular economy principles throughout delivery.

Key achievements included installing 9,000 tonnes of reinforcement, placing 40,000 m³ of concrete, and achieving major carbon savings through the reuse of 785 tonnes of steel. Scheduled for completion in early 2027, Salisbury Square will play a significant role in the future of policing and public service in the City of London.

Aviation · Heathrow

Keltbray has delivered a series of essential infrastructure packages at Heathrow Airport, supporting the operation of one of the world's busiest aviation hubs. Working across airside and landside environments, we completed pavement renewals, drainage upgrades, stand enhancements, and key enabling works that maintain airport resilience and capacity.

Operating within a live, high security environment required disciplined planning and precise execution. Our teams delivered the works within tight night time possession windows, coordinating closely with operational teams to ensure zero disruption to aircraft movements or passenger services.

Our work has helped enhance the reliability, safety and long term performance of Heathrow's critical infrastructure.

Nuclear · Sellafield Ltd

Keltbray delivered the Phase 1 enabling works within the ILW East Zone, laying the groundwork for major future developments including LSS1 and BEPPS2. The scope covered extensive excavation to formation level, installation of drainage, roads and ducting, temporary surface-water management, and associated supporting infrastructure.

A defining challenge was operating within a high-security nuclear environment. Working inside the secure perimeter of the Sellafield site meant every activity required meticulous planning, rigorous risk assessment, and authorisation to meet stringent nuclear safety and security protocols.

To meet these demands, the team embedded security considerations into every stage of delivery, from early planning and induction through to execution. Daily coordination with the client's security and health-physics teams ensured that plant, personnel, and deliveries complied with access controls, virtual lane systems, and radiological-clearance requirements.

Civils for energy infrastructure · Bucks DC Limited

Keltbray delivered the full enabling and foundation package for a new data centre on a complex brownfield site. Works included a 250 metre contiguous piled wall cantilevering to 12 metres and a 70 metre sheet piled perimeter, both completed with reinforced capping beams.

The team undertook 80,000m³ of bulk excavation, followed by a combined temporary and permanent propping solution using MGF props, RC beams and CFA piles. Keltbray installed 1,200 CFA bearing piles, constructed around 150 pile caps and two tower crane bases, and delivered all permanent drainage, ducting and underground tanks.

These works provided a fully prepared, structurally robust platform for the data centre, delivered safely and to programme.

Transport · HS2

Keltbray is delivering the enabling, groundworks and piling package for the new HS2 Curzon Street Station for Mace Dragados JV. Early works include a full site strip, haul road construction, berm removal and reduced level excavation, along with extensive utilities investigations, diversions, drainage installations and protection of live services.

Keltbray constructed the piling mat and installed 86 m of contiguous rotary bored piles adjacent to live Network Rail assets, followed by the RC capping beam and bulk excavation.

Across the wider 100,000 m² site, Keltbray is preparing the platform for future station foundations, including remediation and service diversions. The team is also installing 2,000 piles to support the station building, platforms and the interlocking piled walls forming the station basement.

Commercial and mixed use · Mitsubishi Estate Property London and Stanhope PLC

Keltbray delivered the full demolition, enabling works, piling, basement excavation and reinforced concrete construction for the redevelopment of 6–8 Bishopsgate and 150 Leadenhall, clearing the site for the new 50 storey 8 Bishopsgate tower.

The works included asbestos removal, soft strip, full structural demolition to B1, complex temporary works design by Wentworth, and extensive pile probing and backfilling. Following demolition, Keltbray executed the piling strategy, secant wall installation, excavation, propping and construction of the new B2 slab, while maintaining the stability of neighbouring assets including 22 Bishopsgate.

Operating within a highly constrained City of London site, Keltbray managed significant logistical and stakeholder challenges — from shared access routes and heritage constraints to TfL interfaces, party wall agreements, live utility protection and archaeological findings.

Commercial and mixed use · Stanhope

Keltbray delivered the complex enabling, temporary works, substructure and superstructure phases for the redevelopment of the Grade II listed 76–78 Upper Ground building on London's South Bank. The scheme expanded the former IBM headquarters from 200,000 sq ft to around 300,000 sq ft, requiring major demolition works, removal of existing slabs and full deconstruction of the original structural cores.

Our in house engineering consultancy, Wentworth, designed extensive temporary works to maintain stability while protecting exposed heritage elements. Working in a constrained, highly sensitive location adjacent to the National Theatre, we managed strict logistics, community liaison and performance based noise constraints throughout delivery.

A major circular economy strategy saw significant materials — including listed granite panels, brickwork, paving blocks and raised access flooring — carefully salvaged and reused, preventing substantial carbon emissions.

Industrial and nuclear decommissioning · SSE Renewable Energy

Keltbray delivered the decommissioning and controlled demolition of Ferrybridge Power Station in West Yorkshire, acting as Principal Contractor and Principal Designer across a highly complex, multi hazard site.

The works involved large scale asbestos removal, mechanical and explosive demolition of the main steel boiler house structures, the controlled collapse of eight reinforced concrete cooling towers, and the demolition of two 198 metre chimneys, along with extensive ancillary structures including the original coal barge unloader on the River Aire.

Operating in close proximity to a live National Grid substation, overhead HV lines, adjacent energy from waste facilities, major highways and neighbouring communities, Keltbray implemented rigorous environmental controls, continuous air and vibration monitoring, and best available technology dust and waste management systems. More than 250,000 tonnes of concrete and brick were processed and reused on site, with over 100,000 tonnes of scrap metal recycled.

Commercial and mixed use · London Museum

Keltbray delivered the complex transformation of the historic Smithfield Market buildings into the new London Museum, working alongside Wentworth to combine structural redevelopment with sensitive heritage preservation. The scheme revitalised two Grade II listed market halls — the General Market and the Poultry Market — and required extensive temporary works, structural alterations and careful conservation of original façades and historic features.

Our integrated delivery model, covering demolition, groundworks, engineering solutions and temporary works, enabled the team to respond quickly to discoveries typical of buildings of this age, including hidden vaults and historic infrastructure. Operating within a constrained Central London location, we managed significant logistical challenges while prioritising the sustainable reuse of materials.

Transport · Balfour Beatty Vinci

Keltbray is delivering a portfolio of major viaduct structures as part of the HS2 Sublot 2B scheme, including Balsall Common Viaduct, Marsh Farm Viaduct and River Blythe Viaduct. Collectively, these structures form a critical section of the HS2 route, carrying two high speed rail tracks across watercourses, flood plains and local transport corridors.

The viaducts are predominantly constructed using precast concrete beam solutions with in situ reinforced concrete decks, supported on reinforced concrete piers and abutments founded on deep piled foundations. Beam spans typically range from approximately 20m to 25m, with structures configured as continuous bridge units separated by expansion joints.

A key delivery challenge is the integration of multiple structural interfaces, including piled foundations installed by others, bearings, precast superstructure elements and extensive in situ concrete works. Each structure requires precise setting out and tolerance control to meet the demanding standards associated with high speed rail infrastructure.

Transport · Align JV

Keltbray delivered the reinforced concrete works for five HS2 C1 ventilation and access shafts in Buckinghamshire, overcoming the significant challenge of constructing complex structures up to 65 metres below ground in tightly constrained conditions.

The project required the installation of deep base plugs and large scale tunnel interface collars that stabilised diaphragm walls and enabled TBMs to safely pass through the shafts, while allowing for future tunnel breakthrough.

To manage programme and logistical risk, Keltbray deployed slipform construction for the main shafts, operating 24/7 to maintain momentum and certainty. This approach, combined with careful coordination with tunnelling teams and a phased transition from deep below ground works to above ground construction, ensured safe, efficient delivery of a technically demanding scope.