Cricklewood Glass - Quality Products & Services Since 1986

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Secondary Glazing – Listed Sash Windows



Secondary Glazing for Heat & Energy Insulation - A Case Study

The Whitechapel Bell Foundry - London E1

The Whitechapel Bell Foundry Heritage Secondary Glazing for Listed Building Sash Windows Secondary Glazing East London Secondary Glazing for Sash Windows Stock White Frames Provide a Good Match Secondary Glazing East London

Originally operating from buildings destroyed in The Great Fire of London (1666) the present premises were built in 1670 and are Grade 2 Listed.

The Whitechapel Bell Foundry has the distinction of being the longest running manufacturer in Great Britain (Guinness Book of Records) established in 1570 during the reign of the Queen Elizabeth I and trading continuously for over 400 years up to the present day, during the reign of Queen Elizabeth II.

Famous Whitechapel bells include Big Ben and the famous American symbol of independence, the Liberty Bell. The Company has been exporting since 1747, when a set of bells was sent to St. Petersburg, Russia.

Because of the premises listed building status, replacing the sash windows was not a practical option and indeed they were still in good, serviceable condition.

However, a modern standard of heat insulation for the windows had become essential for both the comfort of employees and to combat ever increasing energy costs.

During 2008, the contract for secondary glazing the East London buildings’ vertically sliding sash windows was awarded.

This was achieved using the Legacy ® secondary glazing heritage range of Counter-Balanced Vertical Sliding Windows fitted with Tilt-In facility which allow easy cleaning of the reverse side of the glazing and are approved for secondary glazing grade 2 listed.

The Tilt-In facility is a unique feature essential for most London sash windows because of the lack of reveal depth to facilitate cleaning between the inner and outer panes of glass.

The Foundry’s sash windows are a mix of white painted finish and light oak finish. Our stock white and stock brown frame finishes provided a good match in both cases.

Windows fronting onto the busy Whitechapel Road at ground floor level have sandblasted glass vanity screens fitted between the sash windows and the secondary glazing.

As an added bonus, although this work was carried out primarily for heat insulation to create energy efficient windows, there has been a noticeable decrease in noise from outside.

Further information:

Download our Secondary Glazing Brochure pdf

Secondary Glazing for East London Grade 2 Listed Building Sash Windows


This gallery features the Legacy ® secondary glazing heritage range of Tilt-In Easy Clean ® Counter Balanced Vertical Sliding Windows, installed over original Listed Sash Windows.

Secondary Glazing Listed Building Secondary Glazing Sash Windows for Heat Insulation Secondary Glazing East London
Secondary Glazing for Grade 2 Listed Building Secondary Glazing Vertical Sliding Windows Heritage Secondary Glazing London
Secondary Glazing Grade 2 Listed, Stock Brown Frames Provide a Good Match, Secondary Glazing East London

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