160 Aldersgate Street
The newly completed 160 Aldersgate Street provides 266,000ft2 of extensively refurbished, high quality office space for the City of London market.
As designed by Fletcher Priest Architects, the project consisted of the full replacement to the existing façade, new open roof terraces and the inclusion of additional storeys.
We were appointed by Greyhound Investing Corp c/o Mercer Real Estate Partners to carry out full structural, M&E and fire engineering design duties. This included advising on the energy strategy and façade performance to meet Part L2A 2010 requirements.
The 1980’s office block, situated above the deepest car park in London, has gone through a dramatic reconfiguration of the existing atrium, main entrance and upper level floor space to maximise the use of the basement, ground floor and office areas.
Maximising sustainability through retention
From design to construction, a structural philosophy was established around the central principle to retain as much of the existing structure as possible, only providing new strengthening works where it would prove most beneficial. This approach endeavoured to maximise sustainability through retention, whilst also creating substantial cost and programme savings.
Our Structures team’s design strategy pursued superstructure modifications that left the substructure intact and worked within the existing grids, column and piled foundation capacities. These were determined on a load-balance concept, whereby column loadings largely remained within their current capacities.
There were a wide range of complex structural attributes to achieve the Architects’ vision. This included the construction of the lightweight steel-composite structure for the additional levels, significant reshaping of the large central atrium, wholesale façade extension and replacement to the front of the building, in addition to intensive fabric survey works and forensic calculations.
A large proportion of the building had been pre-let prior to the completion of the detailed design and our Building Services team were involved within the negotiations and inclusion of tenant requirements.
The mechanical and electrical services had to be designed and installed to fit within the existing basement due to the developments’ challenging location being above a large NCP car park. The creation of an additional office floor at roof level required the ventilation and heat rejection plant to be entirely replaced. This led to restrictions to the new roof plant space to not only keep within planning height limits, but also to facilitate the roof terraces and integration around the new atrium.
Our team designed a CHP plant and low energy cooling strategy incorporating DC motors on FCU’s, low energy lighting and high performance chillers in order to reduce the building’s carbon emissions, achieving a BREEAM 2014 – ‘Excellent’ rated office space.
Mark Terndrup, Director of Building Services, commented; “160 Aldersgate is a great example of how existing buildings can be totally transformed into Grade A office space. Our structural and M&E teams worked closely with Fletcher Priest Architects to improve the building efficiency and bring the building up to BCO standards.”
The project was completed in October 2017.