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Case Study

Norman Shaw North Building

Westminster, London
TRC were appointed by the Wates Group to refurbish the windows on the Norman Shaw North building, a Grade 1 listed structure which overlooks the Thames in Westminster.

Designed in 1887, the North Building, along with the South Building, was originally the location of New Scotland Yard. Since 1967 it has been used as parliamentary offices.
Services provided
TRC were appointed by the Wates Group to refurbish the windows on the Norman Shaw North building, a Grade 1 listed structure which overlooks the Thames in Westminster.

Designed in 1887, the North Building, along with the South Building, was originally the location of New Scotland Yard. Since 1967 it has been used as parliamentary offices.

This project incorporated the repair, refurbishment and modification of timber windows and the supply of equivalent replacement windows where restoration of existing windows was not reasonable.

In addition, we were asked to prepare a survey report for almost 500 timber windows of several types at various locations and to develop and propose a methodology for timber window refurbishment within the building.

As a leading provider of window refurbishment services in the UK, TRC has a long history of working on historic buildings and a reputation for quality workmanship. We were proud to preserve and add value to such a majestic building.

 

Big Ben stands prominently against a clear sky, with surrounding buildings partly obscured by scaffolding, amidst an urban riverside setting with lush trees.

Process

Work included producing control samples and benchmarking windows under vigorous quality inspection, baseline overhaul involving removal of built up debris to frames and glazing (completed with installation of Draftfix draught exclusion system), removal of excess paint and plastic film from glass surfaces, replacement of missing/broken historical glass or redundant fans with approved matching glass alternative, size and shape restoration of sashes by packing or shooting, sash cord replacement, and mechanical check/action facilitating correct operation of windows.

Timber repairs were carried out using our proven RepairCare methods in combination with modern timber splicing techniques and bespoke timber parts replacement with resembling timber species which aim for minimal removal of original material.

Improved resistance to window timber decay was achieved by using conservation joints and replacing old weathered putty with modern alternatives.

All bare timber repair surfaces were made ready and primed using more user/environment friendly water-based dual-purpose Dulux Wood Primer.

Project value £500K
Client House of Commons
Main contractor Wates
Date 2023 - ongoing

Any window ironmongery items including fanlight actuators were carefully removed, bagged up and an inventory record kept. These items were then sent to a specialist restoration firm for cleaning and refurbishment following heritage ironmongery repair methods. Any ironmongery defective or beyond repair was noted and alternatives offered. Special attention was required for old existing fanlight actuators due to their size and casted iron fragility. The finishes and base material of replacement ironmongery were matched to originals. After restoration, the ironmongery was carefully installed back on to the windows in original locations.

Prior to manufacture, new bespoke replacement windows required detailed design to match existing windows. The removal of existing windows and installation of new windows was performed in a focused manner. Reusable parts of existing windows were kept and used for repairs of other windows in the building.

Challenges

  • The Norman Shaw North Building is a Grade I listed structure so the refurbishment had to be carried out in a sensitive manner
  • The windows were located at high levels (some were very big and located in staircases) so access was challenging
  • The project took place on a high security site which necessitated specific management and work procedures

Solutions

  • We used a variety of techniques to minimise the impact of the refurbishment on the building’s historic fabric
  • We employed highly skilled labour and expert management
  • We worked closely with the client and the parliamentary conservation architect to ensure refurbishment met required standards
  • We developed a detailed plan to manage the project effectively

Results

The window refurbishment of the Norman Shaw North Building was a complex project successfully completed by TRC Windows. The new windows are a valuable addition to the building and will help preserve it for future generations.

  • The refurbishment of windows has enhanced the building’s appearance
  • The new windows are a faithful reproduction of the originals
  • The project has improved the building’s energy efficiency and accessibility
  • The project was completed on time and within budget

 

History

Other than the Palace, the Norman Shaw North Building is the only other Grade I Listed building on the Parliamentary Estate. Both buildings were listed on the same day in February 1970, which means the structure is of exceptional architectural or historic interest.

The building was originally built in 1888-90 as the headquarters of the Metropolitan Police. When the Metropolitan Police moved to new premises in nearby Broadway in 1967, the Norman Shaw buildings were acquired for incorporation into the Parliamentary Estate in the early 1970s.

The windows in the Norman Shaw North building are a significant part of the building’s character. The original windows were made of timber and leaded lights. The refurbished windows are existing originals and all new windows are a trusty reproduction of the originals which also incorporate modern features such as draught exclusion.

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