Issue 46 April 25 web - Flipbook - Page 18
Conservation Area, disrupting the characteristic terraces
of stuccoed townhouses with a 68-metre frontage of
horizontally-expressed brick and concrete.
first floor planters that continue the line of balcony
gardens that run along Belgrave Road.
Behind the pre-cast façade, a high-performance curtain
wall system constructed using engineered oak wraps
around the main structure. This timber is expressed
internally, benefitting the office spaces with the tactile,
acoustic and aesthetic properties of the oak. The facades
have been designed for future disassembly, to accommodate easy refurbishment and recycling, allowing the
sustainability and retention strategy to exceed the
building’s lifetime.
The project to renew 11 Belgrave Road retained and
repurposed an ambitious 35% of total built fabric already
on site – including a large section of the concrete structure
and foundations. This substantially reduces the lifetime
embodied carbon emissions of the project, which has been
designed to exceed the RIBA 2030 Climate Challenge
embodied carbon target by 38%. Predicted whole-life
embodied carbon emissions for the project are 466 kg
CO2e/m², with the upfront embodied carbon achieving
a LETI A performance of 324 kg CO2 per m². The base
build of 11 Belgrave is designed to achieve Net Zero Carbon in both Construction and Operational energy in line
with the UKGBC Framework. The operational energy of
the base building is estimated to be 37.4kWh/m2 (NLA),
which is below the RIBA 2030 targets for base building
energy consumption and achieves a NABERS rating of
5.5 star.
A new penthouse office floor has been added, constructed
in steel and cross laminated timber, increasing the overall
floor space by 31%, from 110,800 sq ft to 150,000 sq ft.
The additional floor is set back to create generous garden
terraces with a spiral stair leading to a new roof level
offering expansive views of the city of London.
The renewal optimised the retained existing structure,
and the large openable windows throughout frame key
landmarks of the city. These provide excellent levels of
natural light, a key principle of the wellbeing design.
Complementing the flexible floorplates, smart technology
and building management systems have been installed
throughout the building to guide occupants and control
optimal working conditions and a healthy working
environment.
While working sensitively with the existing structure, the
new design has radically transformed the building visually,
ensuring that it sits harmoniously within the conservation
area. Eric Parry Architects’ new self-supporting precast
stone façade to Belgrave Road echoes the rhythm of the
adjacent terraces and adopts a modern take on the traditional entrance porticos. This is further reinforced by the
Above, 11 Belgrave Road (C) Dirk Lindner
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Conservation & Heritage Journal
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