The Project

10 Lewis Cubitt Square forms part of the 67-acre King’s Cross Central Limited Partnership (KCCLP) redevelopment. It is a mixed-use 12 storey commercial development built to CAT A fit-out standard and offering nine floors of flexible office space. It also includes a large flexible retail unit at street level plus a 600-seat theatre.

Designed by Allford Hall Monaghan Morris Architects the 250,000 sq. ft building forms one of two new offices for high profile tech company Meta. The office floors are designed to promote health and wellbeing by offering generous spaces, large windows and terraces on every level (smaller terraces on levels 1-4 and a large garden terrace on level 5), and various breakout spaces. It also accommodates flexible working with the Kier Mechanical and Electrical services design allowing the floors to be adapted, utilising a four-pipe fan coil system.

Various forms of MMC and digital tools were incorporated on this project to save time on programme, ensure factory quality products, reduce waste on site and support various sustainability drivers. The logistics were complex due to its proximity to existing residents and retail areas. In some areas the final line of the building is only 3m from the edge of the hoarding making space on site very restricted.

The Approach

To provide programme certainty, the team accelerated the design and manufacturing of the complex twin layer façade elements, produced in Germany and Ireland, and rented storage areas in the UK to hold the material. To ensure buildability and to manage quality on site, the team invested in full scale façade and bathroom mock-ups which acted as benchmarking tools for the client and project teams.

Following the double basement bulk dig, 30,000 m3 of excavated material was diverted from landfill and reused as part of an earthworks construction project. During the in situ concrete basement construction digital probes were utilised to monitor the concrete curing process, enabling early striking of formwork. For the precast concrete façade layer, 1042 precast concrete polished panels were installed, covering an area of 10,000m2. Other MMC include the unitised glazed façade layer, precast hollowcore flooring, modular bathrooms and prefabbed MEP components including tanks, pipework and pump skids, air handling units, generators, security equipment and mechanical riser units.

Various digital tools were used throughout for planning, recording and reporting purposes; these included a BIM model, scanning and photo recording by Holobuilder, Multivista and Matterport; vibration, noise and dust monitoring; thermographic surveys for insulation / cold bridge checks; data analysis project dashboards; 4D Planning and full-time timelapse and CCTV cameras.

The Result

The use of MMC minimised the impact on the local area as it resulted in less people and deliveries on site. The project achieved over 1million RIDDOR free manhours, showcasing the health and safety benefits of MMC. The large slipform core, with footprint of approx. 26 x 17 meters, totalling c. 4000m3 of concrete, resulted in a 30-week saving on the programme, enabling an earlier steel frame erection. Compared to the traditional stick system, the unitised glazed façade enabled the follow-on trades to commence much earlier. This faster installation method resulted in up to 30 panels (or 90m) of façade being installed in a single day.

The use of 20,000m2 precast hollowcore flooring enabled a flat concrete soffit to be exposed from underneath and resulted in a two-week programme saving per floor, 50% faster in comparison to in situ concrete, reducing deliveries and providing thermal and long span benefits. The modular bathrooms resulted in a two-week programme saving per floor and the use of Knauf Dry Screed flooring systems avoided the requirement for a large screed pump on site and reduced screed drying times, enabling finishes to be applied earlier.

10 Lewis Cubitt Square
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" It was a really positive experience working with Kier; they clearly have fantastic construction expertise, we enjoyed the ease with which we were able to collaborate with them, and the result is just brilliant. The completion of 10 Lewis Cubitt Square is a major milestone in the development of King’s Cross. It not only reinforces our position as London’s destination for creative and innovative businesses and individuals, but also reflects our continued confidence in the importance of the workplace as a place to collaborate, connect and be inspired. Meta are very happy with their new offices and we look forward to welcoming more of their employees to the estate very soon. "
Tom Callaway Senior Development Manager Argent LLP

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