In recent years the Museum has benefitted from a major renovation programme. The latest phase involved the demolition of the old Boiler House Yard buildings to make way for new facilities. Acoustic consultants Bickerdike Allen Partners conducted a study on the noise and vibration impact of the works to the Grade I and Grade II* Listed offices and galleries bordering the site, which were to remain fully operational throughout the entire build period. The study concluded that, prior to commencement of these works, it was essential to install acoustic secondary glazing to affected windows in order to provide acceptable working conditions. The specification required the secondary glazing to: 'Allow access to the primary windows for general maintenance and ventilation; glazing to be at least 6.4mm clear laminated glass' and for the secondary glazing to 'achieve a minimum window noise reduction of 10dB - over and above the noise reduction provided by the existing windows'. Based on this brief, Selectaglaze built over 60 window frames, in a range of styles. The largest in the Henry Cole Wing were 3.5m high and nearly 2m wide including arched heads. These were treated with heavy duty sash windows coupled to a slim high level, arched fixed panel to ensure a sympathetic match.