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Bloom Clerkenwell

London, UK

º£½ÇÊÓƵ brought together structural and building services engineering, alongside energy consulting, to shape Bloom Clerkenwell into a high‑performing workplace that sets new standards for sustainability, wellbeing and commercial flexibility. 

Situated in the heart of London’s creative district, right next door to Farringdon Station, Bloom Clerkenwell offers 18,100m² of contemporary office accommodation over 10 floors. 

Facilities include a lively ground floor front retail offering, cycle storage for 243 bikes on the ground floor, a fitness studio, changing rooms and showers in the basement. Office space is located on levels one to seven, with floor four, six and seven equipped with terraces providing views out over London’s many landmarks, including St Paul’s Cathedral. 

º£½ÇÊÓƵ delivered structural and building services engineering (MEP), as well as energy efficiency consultancy for this prestigious project. We worked closely with our client and the wider project team to realise a development that showcases great design rooted in wellbeing, in which sustainability runs through every part. The project has achieved WELL Platinum certification, BREEAM Outstanding status and WiredScore Platinum for digital connectivity and innovation. 

Constructed over Farringdon Station, where three main Elizabeth Lines intersect, Bloom Clerkenwell is possibly the UK’s best connected office complex. 

Our structural and building services engineers collaborated to realise flexible modern contemporary office space across seven storeys designed to support wellbeing. 

We provided key structural and MEP engineering along with extensive environmental consultancy, incorporating innovative measures and SMART systems to create a comfortable, intuitive user experience. 

Bloom Clerkenwell has achieved WELL Platinum.

The project has achieved BREEAM Outstanding status and WiredScore Platinum for digital connectivity and innovation.

Challenge

Although the excellent transport links enjoyed by Bloom Clerkenwell will be an advantage for occupants, they imposed significant constraints on our team. The building was to be constructed on top of the proposed Elizabeth Farringdon West Crossrail station concourse, at the junction where three different lines intersect – the North-South Thameslink route, the East-West Crossrail and the London Underground. Complicating matters further was our involvement from scheme design RIBA stage 3, which meant we inherited unresolved issues from the concept design. 

To ensure the building is attractive to a variety of tenants, our client wanted to provide high flexibility of function and arrangement across the leasable area. Coupled with the building’s location, a lack of information on the existing substructure’s settlement and the need for construction work to begin prior to completion of the design in all disciplines, this put pressure on our structural team to develop an adaptable design that allowed for future changes. 

In parallel with these physical concerns, our engineers were striving to achieve exemplary environmental targets. Key to this was making good use of available water on site, but again this was compromised by the location itself. Water reservoirs would usually be located in the basement of a building, but as Bloom Clerkenwell stands above a station, the floor slab could not bear that amount of weight. 

Planning restrictions came into play when considering low energy services solutions. With a lack of consent for any mechanical devices, apart from photovoltaic panels, to protrude beyond the edge of the roof, we had to find a clever strategy for air distribution using units that did not exceed 3m in height. 

Alongside the structural and logistical constraints of building above one of London’s most complex transport interchanges, the project set out to achieve leading environmental performance and create a workplace centred on health and wellbeing. Early ambitions included delivering a net zero carbon-ready building in operation, achieving significant reductions in whole life carbon and water consumption, and meeting the highest standards of occupant comfort. A whole life carbon assessment established an ambitious benchmark of 597kgCO2/m², targeting a 36% reduction against UKGBC baselines and outperforming RIBA 2030 targets.  

At the same time, the building needed to provide enhanced indoor environmental quality, including increased fresh air provision and low pollutant materials, while maintaining flexibility for future occupiers. Balancing these performance targets with the physical limitations of the site, planning constraints and an evolving design presented a complex, multi-layered challenge for the project team.

Solution

Before commencing work on the structural design, our team undertook a detailed review of the Crossrail documentation, documentation from the consultant responsible for design development up to stage 2, and the site to ensure that our proposed solutions would be feasible and in line with all requirements. We then developed a superstructure for the building comprised of a steel frame with a reinforced concrete core to ensure stability. 

We adjusted the shape of the floor slabs on levels one to three to accommodate the existing structure of the Underground station below. To further ensure safety, we verified the forces acting on the structure with the designers of the station after each significant stage of construction. Introducing braces at critical locations to reduce movement across the main structural frame ensured stability despite the lack of information we had on the existing substructure. 

To ensure our structural design was adaptable, both during construction and to meet the requirements of tenants afterwards, we incorporated a range of openings within the steel beams to create various arrangements of lettable office space. Our structural and building services engineers also worked closely to coordinate the distribution of services, maintaining this flexibility of design while also providing optimum temperatures and fresh air to support user wellbeing. 

The º£½ÇÊÓƵ team identified a number of ineffective solutions from RIBA stages 1 and 2, and proposed several options for the client’s approval. These included optimising the plant rooms and vertical distribution of services, allowing for higher flexibility in services distribution, and achieving this through close coordination between our structural and services teams. 

To resolve the issue with the water reservoir, we developed a ‘blue roof’ system that is integrated into the roof to slow down rainwater runoff to the reservoir. This allows the amount of rainwater discharged to be controlled at all times so that it does not flood the reservoir or impose too much weight on the basement floor slab. 

We also undertook energy modelling to gauge the efficiency of our designs and the cost of the investment, and then assessed their value in terms of both functionality and flexibility. Energy efficient four-pipe fan coils will provide heating and cooling, while the SMART air distribution has been designed based on a system that adjusts the amount of fresh air supplied depending on the concentration of CO2 detected by sensors. 

A performance-led design approach was adopted from the outset, underpinned by detailed analysis and modelling to inform key decisions. Whole life carbon assessment and energy modelling guided material selection, systems design and operational strategy, enabling the team to reduce embodied carbon to 597kgCO2/m² and position the building to meet net zero carbon targets in operation. Energy use intensity was carefully managed, with an EPC rating of A and a design target aligned with UKGBC benchmarks.

The building is powered by REGO-certified renewable electricity and connected to the Citigen district trigeneration (heating and cooling) energy network, supporting a transition to lower and zero carbon heating and cooling. Photovoltaic panels further reduce operational emissions, displacing approximately 14 tonnes of CO2 annually, while water efficiency measures deliver a 55% reduction compared to a typical baseline.  

In parallel, a strong focus on user wellbeing shaped the building services strategy and internal environment. Demand-controlled ventilation provides a minimum of 14 litres per second of fresh air per person, exceeding typical standards, while high-performance filtration and low VOC materials (volatile organic compounds) support improved indoor air quality. Smart systems continuously monitor CO2 levels, air quality and occupancy to optimise conditions in real time, enhancing comfort while minimising energy use. Access to 15,400ft² of terraces, extensive cycle facilities and integrated wellness amenities encourages active lifestyles and support healthier patterns of work. Together, these measures create a responsive, high-performance workplace environment that prioritises both environmental responsibility and the experience of its users. 

Other efficient measures include SMART lighting controls, PV panels on the roof and a building management system that automatically monitors and optimises energy use across all installations.  

Value

Despite the unique constraints of the site and significant demands of this project, Bloom Clerkenwell achieves a very efficient use of space and excellent functionality. Our structural design realised open plan, flexible floorplates on every level of the building, supported by efficient services that can also be adapted according to tenant requirements. 

We made extensive use of BIM throughout this project to facilitate precise coordination across the project team – from initial structural modelling and layout adjustment, through to delivery of work and later building use. This allowed us to collaborate with the project team, integrating disciplines and solutions to realise attractive, flexible office accommodation above the UK’s busiest station. 

Bloom Clerkenwell stands not only as a new landmark for London, but also for positive working practices and sustainable design. The project has achieved WELL Platinum, WiredScore Platinum and and BREEAM Outstanding certification, proving that exceptional results can be achieved when fresh-thinking, growth and wellbeing are nurtured.