Restoration of Tower to Grade I Listed Historic Castle

The tower of this Grade I castle is believed to have sunk into the ground after prolonged rain and a lack of drainage, the tower itself had rotated and sheared away from the main structure, splitting the stone wall and making the building unsafe. A complex scaffold had been established as an emergency method to support the tower; this provided the working platforms to fit the internal structural metal band restraints and the helifix bed joint reinforcement.

Mini helipiles were installed at the base of the tower and needle beam apertures were core drilled through the masonry to minimise vibration and any further damage to the tower before steel supporting beams were threaded through these holes and propped from new foundations inside and outside the structure. Finally the steel needles, pile caps and reinforcing were encased in concrete to homogenise the supporting structure and prevent any further movement.

The original mortar mixes were carefully analysed and new mortars were matched for both colour and sand and aggregate type and sample panels of various mixes were allowed to dry to ensure a perfect match was achieved with the original materials.

On completion of the structural work further restoration works were needed to replace and repair the damaged flagstone roof and floor and to carefully repoint the external stonework once the helifix ties had been embedded into the masonry joints to ensure continuity was maintained with the original castle structure.


  • Preserving what had become a dangerous structure with the possibility of collapse
  • Maintaining the integrity of the building during the structural works


  • Installing low vibration mini helipiles to underpin the building
  • Achieving a near seamless integration with the surrounding castle building


Site manager: Dan Durant

External Architect: Sands Consultants

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