July/August 2021 - 93

Whitfield Street early in development, with demolition at 80 Charlotte Street, at left
FEATURE ARTICLE
Foundation Reuse at Historic London Buildings
Reusing foundations not only can
provide cost savings, but also reduces
projects' carbon footprints when
compared to demolition and rebuild. As
a result, foundation reuse was the focus
for a complex process of investigation,
discovery and outside-the-box thinking
on a project in the Charlotte Street
Conservation area of London. The project
involved revitalizing 65 Whitfield Street
(65 WS) and 67-69 Whitfield Street (No.
67-69), which are cherished buildings in
the local community. No. 65 is a 1950s
building that was constructed on piled
foundations, whilst No. 67-69 is a 1930s
building on deep pad foundations. The
buildings had been used for light
industrial, followed by more recent
office, use. They were to be redeveloped
into residential accommodations. Both
buildings were to be extended by two
new stories as part of this reuse, with the
existing structural frame remaining for
both, but being required to carry
additional load.
Part of the scheme included developing
an area (80 Charlotte Street)
adjacent to No. 67-69 into commercial
space. The adjacent commercial area
was originally intended for reuse, but
the scheme was ultimately changed to a
new build, though with some façade
retention (at No. 71-81 Whitfield Street).
Initial Reuse Plan
A cost-value analysis in 2011 identified
transform and reuse as the most costeffective
strategy for both the resiAUTHORS
Hilary Shields and Jo Sainsbury, Arup
DEEP FOUNDATIONS * JULY/AUG 2021 * 93
dential developments. A planning
application was granted on this basis.
At the time, there was limited information
available to Arup as the engineering
firm for the project about the
two buildings' existing structures and
foundations, so a load-balancing
approach was applied, with lightweight
construction proposed for the new
additional floors.
Possible column strengthening was
included in the cost estimate for the
65 WS foundation. However, strengthening
was considered a risk that was
unlikely to be required based on the
load-balancing approach. The stability
systems for the original building were
unclear, and the existing core arrangement
deemed inappropriate for

July/August 2021

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