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Structural Alterations

Temporary Works, Structural Steel and Foundations

J.A.C construction is the only company in London with a comprehensive and unique structural alteration service. When you combine the following:

Structural Alterations We specialise in forming structural openings in existing buildings. We will install temporary works, carry out controlled demolition, fabricate and install structural steel work and make good the existing structure once all the temporary works have been removed. +Enlarge image
  • design temporary works
  • controlled demolition
  • waste removal
  • structural steelwork
  • pad stones, excavation
  • underpinning
  • pad foundations
  • reinforced concrete beam oversites
  • basement construction
  • concrete and steel lintels
  • brick and blockwork alterations
  • dry packing, grouting
  • chemical fixing

All of the above offer a complete building package “Under One Roof”.

Call us on 020 8998 1616
Or email us at
Underpinning We can install underpinning to reduce the floor level of an existing basement or stabilise an existing structure. +Enlarge image
Ground Beams and Pad Foundations Once temporary works have been installed, we will excavate and form new foundations ready to take structural steel. +Enlarge image
Installation X Two storey openings can be daunting. +Enlarge image
Basement Construction We will construct your basement as a Main Contractor or specialist Sub-Contractor. We can provide the structural basement shell ready for fit-out. +Enlarge image