Syon House was acquired by the 9th Earl of Northumberland in 1594 it has remained in the family ever since. In 1827 Charles Fowler was commissioned to design and construct The Great Conservatory. It has a total frontage of 230ft and the central dome on the tropical house has a diameter of 125ft. This was extensively restored in 1986/7. The Conservatory is now used as a Wedding Venue.

Between January and March 2015 Dorothea Restorations and the design team have developed cleaning and re-glazing methods to ensure any repairs and  restoration works are carried out efficiently to the cast iron columns, pilasters and clerestorey cills preventing water ingress through the fine brass glazing bars. Quite a challenge 40ft in the air.

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