{"id":528044,"date":"2025-09-03T12:28:06","date_gmt":"2025-09-03T11:28:06","guid":{"rendered":"https:\/\/www.constructionnews.co.uk\/?p=528044"},"modified":"2025-09-03T12:28:06","modified_gmt":"2025-09-03T11:28:06","slug":"one-exchange-squares-heavy-touch-refurb","status":"publish","type":"post","link":"https:\/\/www.constructionnews.co.uk\/project-reports\/one-exchange-squares-heavy-touch-refurb-03-09-2025\/","title":{"rendered":"One Exchange Square\u2019s \u2018heavy touch\u2019 refurb"},"content":{"rendered":"
\n

Project name:<\/strong> One Exchange Square
\nClient:<\/strong> LaSalle\/PNB
\nArchitect:<\/strong> Fletcher Priest Architects
\nMain contractor:<\/strong> Multiplex
\nContract value:<\/strong> \u00a3235m
\nContract type:<\/strong> JCT 2015 Design & Build
\nStructural steel:<\/strong> Bourne Group
\nDemolition:<\/strong> John F Hunt
\nReinforced concrete:<\/strong> Amery Construction
\nStructural strengthening:<\/strong> Pacific Construction
\nUnitised facade:<\/strong> Staticus
\nRetained stone facade and landscaping:<\/strong> Associated Stone Group
\nRetained facade windows and ground-floor facade:<\/strong> OAG
\nScaffolding:<\/strong> GKR Scaffolding
\nWaterproofing and roof finishes:<\/strong> Richardson Roofing
\nMechanical and electrical:<\/strong> Briggs and Forrester
\nProject start date:<\/strong> June 2023
\nContract completion:<\/strong> February 2026<\/p>\n<\/div>\n

If attitudes towards working from home have changed over the past few years, you might
\nhave to look somewhere other than London\u2019s financial district for evidence.<\/p>\n

On a drizzly Wednesday morning in June, Liverpool Street station and its environs are bustling. City suits dash by, chatting noisily into mobiles about deals; middle managers
\nhost one-to-one meetings in coffee shops grasping matchas and mochas; tourists shuffle around gazing anywhere but at the traffic; and a forest of tower cranes hoist all manner of construction products skyward.<\/p>\n

One of those is servicing the Multiplex team working on One Exchange Square, just a few minutes\u2019 stroll from the station. Until a few months ago, two cranes fed this complex redevelopment scheme, but as work on site has progressed, the lifting requirement has reduced. Soon, even the one remaining crane will have fulfilled its purpose and been de-rigged.<\/p>\n

But that\u2019s not to say the work at One Exchange Square is on the home straight \u2013 rather, that the heavy structural work will have been finished, leaving the team with the onerous task of completing the \u201cheavy touch\u201d refurbishment, as Fletcher Priest Architects\u2019 senior project architect, Luca Tesio, puts it.<\/p>\n

In reality, it is far from a refurb project, heavy-touch or not. This is a complex regeneration scheme destined to breathe new life into a tired 1980s office block and provide city firms with the sort of high-end office space that is still so coveted in central London.<\/p>\n

One Exchange Square provides the perfect backdrop for a sophisticated \u2018cut and carve\u2019 scheme: in its previous life, as 175 Bishopsgate, it was until 2022, rather ironically, home to the European Bank for Reconstruction and Development.<\/p>\n

The building\u2019s steel frame and reinforced concrete cores are standard for the era in which it was built, and that robust \u2013 and relatively new \u2013 frame has helped make the new design structurally feasible.<\/p>\n

In effect, the 13-storey building is being extended out by 6 metres on its western elevation, all of which is cantilevered from the existing frame at level two. More than 90 per cent of the original steel frame is being retained. This meant the team had to prove the capacity of the existing structure and whether it was capable of being tailored to the new design \u2013 without carrying out any work below ground level.<\/p>\n

\u201cThere is no basement and no ground bearing loads, due to the close proximity of lines into Liverpool Street station,\u201d says Jamie Lewis, project director at main contractor Multiplex. \u201cThe structure is a very robust steel frame and concrete core, which has been fully assessed to ensure the new design will work. Once the full strip-out had been carried out, it felt more like a new build than a cut-and-carve project.\u201d<\/p>\n

The existing steel has been sandblasted back to bare metal, with 20 tonnes of sand used on each level. \u201cSand can be reused but its effectiveness reduces each time,\u201d notes Lewis, before explaining that \u201cthe bare steel is then intumescent-painted and left open\u201d.<\/p>\n

The new design features a 12-storey steel frame that springs from a V-shaped truss at level two and is tied back into the original steel, which is strengthened with the addition of 20mm-thick plates at the connection points. This V-truss is fabricated using 914x419x388mm universal beam sections bolted together along their length with a series of splice connections and fully welded at the corner junctions to form the rigid frame.<\/p>\n

Extra load<\/h3>\n

\u201cWe have had to increase the cross-sectional area of the existing steel at the connections to withstand the extra loading,\u201d Lewis explains. \u201cThe plates are welded onto both the underside of the webs and the flanges to create the additional stiffeners at the column connections.\u201d<\/p>\n

The increased cross-sectional area aside, there are rather more prosaic reasons the existing frame has proven robust enough for the new design. \u201cThe live loads in 1980s offices were very different to those we see today,\u201d Tesio says. \u201cThe loadings from office furniture and computers, for example, are much lower today. Finite element analysis is much more nuanced now too. We have been able to take the extra loading allowances these changes offer and use them to engineer the new design.\u201d<\/p>\n

Contractor Bourne Steel has been busy erecting 1,200 tonnes of steel to form the frame with the new floor plate stitched into each existing level. The former city-trading floors at levels one, two and three boast a generous floor-to-ceiling height of 4.6 metres. As the new steel frame progresses, each level has been preloaded using 1-tonne precast concrete Kentledge blocks, which are placed as the erection of the new steel frame continues. These replicate the facade panel weight and help ensure the new steel matches the level of the existing metal. In total, there are 200 tonnes of Kentledge, which is removed as the facade installation progresses.<\/p>\n

The facades themselves feature two different systems: the stone cladding reclaimed from the existing building (see box, right) and a unitised system, manufactured offsite and boasting triple-glazed windows with aluminium frames featuring 70 per cent recycled material in their manufacture.<\/p>\n

Access through the new building is provided through three cores. The north and south cores contain single goods lifts, stairs, small washrooms and toilets, while the main central core boasts 13 lifts, two stairways, the main washroom facilities for each floor, plus the service risers.<\/p>\n

The terraces at levels 12 and 13, as well as the roof level, feature \u2018blue roof\u2019 rainwater-management systems that retain water before slowly releasing it, reducing the impact of run-off on the surrounding urban drainage network. The roof also houses the air-source heat pumps that will help ensure the completed building is 100 per cent electric.<\/p>\n

With the Multiplex team set to hand the completed project over in February 2026, all eyes are now on getting the remaining facade sections lifted into position and the interior work complete. Mechanical and electrical commissioning work is due to start in earnest in September 2025.<\/p>\n

Cut and carve it may be, but One Exchange Square is more sophisticated than that.<\/p>\n

\n

Cut and carve key to new city development<\/h3>\n

The scarcity of vacant brownfield sites in our city centres, coupled with a growing insistence from planning authorities that new schemes should be as sustainable as possible, mean that the \u2018cut and carve\u2019 style of redevelopment could become the norm rather than the exception.<\/p>\n

In light of an abundance of aging office blocks and with demand for high-quality office space undiminished, planning authorities across the country are taking a keen interest in reuse over demolition-and-rebuild. At One Exchange Square, the City of London Corporation is no different.<\/p>\n

\u201cThey have been incredibly proactive and interested in what we are doing here,\u201d Lewis says.<\/p>\n

\u201cThey recognise that there are plenty of other, similar assets within their area and that this style of
\napproach will become increasingly commonplace.<\/p>\n

\u201cThese are the sorts of schemes that we want to be involved in.<\/p>\n

\u201cThey will become the norm in city centre locations and we want to be able to position ourselves as construction problem-solvers.\u201d<\/p>\n<\/div>\n

\n

Reclaimed facade helps set environmental standard<\/h3>\n

Part of the remit for Multiplex\u2019s One Exchange Square project team was to deliver a high-quality office building against the highest sustainability and environmental standards. Targeting BREEAM \u2018outstanding\u2019, WELL \u2018platinum\u2019 and NABERS UK\u00a0 Design for Performance five-star ratings, the building will be entirely powered by electricity, net-zero-carbon in operation, and have 50 per cent less embodied carbon than other similarly sized office buildings.<\/p>\n

Much of this carbon efficiency is thanks to the work the team is doing to retain as much of the existing structure as possible. With over 90 per cent of the steel frame remaining, they certainly seem to be delivering.<\/p>\n

But it\u2019s the work to retain, re-engineer and reuse the existing concrete facade systems that also catches the eye. Some 2,000 square metres of the existing facade is being reused in the final scheme, and both Lewis and Tesio underline the importance of having the client on board to make the retention of this amount viable.<\/p>\n

\u201cIt is very important that the client was able to be convinced that the highest levels of performance could be achieved by using the existing cladding,\u201d Tesio says. \u201cIn terms of both risk and warranty, we had serious discussions with the client, but they have always been willing and open to new ideas.\u201d<\/p>\n

The existing cladding panels have been refurbished and painted \u2013 rather than stained \u2013 with three coats of a charcoal grey hue that makes them look as good as new. Triple-glazed windows have been installed and the insulation enhanced.<\/p>\n

This approach has resulted in \u201cclear programme benefits\u201d, Lewis says: \u201cWe have surety of supply and there is less material to purchase.\u201d<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Project name: One Exchange Square Client: LaSalle\/PNB Architect: Fletcher Priest Architects Main contractor: Multiplex Contract value: \u00a3235m Contract type: JCT 2015 Design & Build Structural steel: Bourne Group Demolition: John F Hunt Reinforced concrete: Amery Construction Structural strengthening: Pacific Construction Unitised facade: Staticus Retained stone facade and landscaping: Associated Stone Group Retained facade windows and …<\/p>\n","protected":false},"author":82076,"featured_media":528052,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ep_exclude_from_search":false,"footnotes":""},"categories":[559,557],"tags":[],"class_list":["post-528044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-long-reads","category-project-reports"],"yoast_head":"\nOne Exchange Square\u2019s \u2018heavy touch\u2019 refurb | Construction News<\/title>\n<meta name=\"description\" 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