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29-33 King Street, London

Client : Cornerstone City Developments
Value : 15 M

Overview

29-33 King Street was a development by Cornerstone City Developments with Kier London as the Main contractor on the project.

The works comprised of asbestos removal, soft strip, piling works for the tower crane, facade retention, party wall shoring, basement propping, hard demolition to below basement slab and underpinning.

The scheme involved extensive archaeological investigations by MOLAS which was also facilitated under the demolition package. 

Scope of Works

  • The archaeological evaluation found that across the site there were Roman deposits in the form of pits, dumps, possible gravel surfaces and a fragment of 3rd century masonry wall that was in the corner of a room or building.
  • A tile floor was noted in the north-west corner of the site, as were rubbish pits that dated from the 10th to 13th centuries and two chalk foundations which were thought to be the remains of medieval buildings.
  • The works were undertaken in a sensitive location in the busy heart of London's City, therefore great emphasis was placed on neighbourhood relations with the community, adjacent banks, City of London and third parties.
  • Structurally 29-33 King Street comprised three different buildings with separate fronts of varying floor levels across the 3 buildings, which were rebuilt to create a new city centre office space now known as 30 King Street.
  • Due to the varying floor plates and nature of construction, the temporary works were designed by the John F Hunt engineering team to carry out both the facade retention and the party wall shoring using four temporary steel towers; allowing the phased demolition, enabling works and new construction to take place. 
  • John F Hunt designed and installed innovative protection that formed an integral part of the public protection/separation regime.
  • Party wall works to the adjacent building were carried out as an integral part of the scheme, allowing protection and temporary weatherproofing.
  • All demolition arisings were removed via a combination of craneage, with controlled vertical transport and debris ramp arrangement.
  • Due to the very tight layout of the site, the sequence of installation of temporary works and the subsequent demolition works became very technical and complicated. 
  • The Portland limestone of the façades, with a lower level of Angola black granite, was the work of stonemasons Putney & Wood who are part of John F Hunt Group.
  • Part of the façade was retained in-situ, where it was cleaned and restored by Putney & Wood, but around 33 tonnes of stone was removed on pallets and taken to Putney & Wood’s yard where it stayed for 18 months, before being re-used.
  • This was a £15 million project with the stone contract valued at £750,000.
  • Being just a few metres from the Guildhall and on the main route of the annual Lord Mayor’s procession, all the stonework on the seven storey facade was cleaned and restored and lead work to the cornices was replaced, ensuring the main elevation remained in-keeping with the historic surroundings of King Street. 

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