Thomann-Hanry®’s cleaning and restoration teams have worked intensively on the massive Portland stone elevations at Devonshire House, a landmark building located on Piccadilly.


1 Mayfair Pl, Mayfair, London W1J 8SB


Grade II listed building


Portland stone

Surface area

10,000 sq. m.

Project duration

8 weeks

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Specialist Portland stone cleaning

Devonshire House is a Grade II listed mammoth Portland stone island office block designed in 1924-26 by the American practice of Carrere and Hastings with Professor Reilly.

The Portland stone building design falls under Glasgow-American classicism with sparing but lively Graeco-Roman details and has relief plaques, with flanking pavilions fully rusticated.

Portland stone cleaning was completed to all elevations using Thomann-Hanry®’s non-scaffold, dry and non-abrasive façade gommage®. Works took place separately to each elevation, all according to client’s convenience with minimal disruption to passers-by and the building’s occupants. Cleaning works were followed by stonework restoration.




For more facade cleaning and restoration projects in St James’s, click here.

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