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Commercial office clean - London

Stratford’s Gredley House in north east London is a five-storey detached office building on the busy Broadway road.

The building’s managers asked OneFifty to clean 400 square metres of the light lower stonework on the building that had become stained and dirty by carbon and algae. We also cleaned the stone arch that opens into a central courtyard so visitors and office workers would be greeted by a bright, clean entrance way.

Tackling lintel algae

Gredley House has four metres of light coloured concrete wall beneath the rest of the building’s red brickwork. Algae was growing on the concrete lintels and areas below the lintels had also become marked with algae that had formed on rain runoff. This, plus general atmospheric pollution, was making the building look grubby and uncared for.

Lintels offer an ideal environment for algae to grow as they stay damp due to the water that accumulates on them.

We used our state-of-the-art SteamPLUS cleaning technology to clean the lintels and walls, and applied a biocide to help inhibit algae regrowth and keep the surfaces cleaner for longer.

Out-of-hours working

As Gredley House is a dedicated office building we carried out the work over the weekend in order to minimise disruption to the building’s users.

Our team arrived on Friday night to assess what needed to be done and formulate a plan of action. Armed with a plan and a good night’s sleep they started work at 6:30am on Saturday morning to clean the area around the bank ATMs before the Saturday morning rush – thus minimising any inconvenience to the bank’s customers.

They then worked on the areas within the Gredley House courtyard, transforming the look of the building as well as protecting surfaces from future algae regrowth.

The management company was so impressed by our flexible approach to working and the results that we achieved that they have asked us to clean the upper levels of the building.  

For more information about exterior surface cleaning contact Max or Andy Morris on 0333 234 1445 or email your enquiry and we will get back to you as quickly as possible.




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Wendy Tomlinson, Senior Conservation Officer for Cheltenham Borough Council

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Tom Brady - MD Building Services

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Daniel Boyle - MD of Relyon Services

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Jason Husk - RelyOn Services

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Robbie Irens - Gordon and Co

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Will Mellor - Knight Frank

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