We are skilled in the protective care, conservation and adaptive re-use of heritage buildings and structures. Working closely with owners, architects, heritage consultants and builders, we develop structural and façade solutions that enable the continued use and appreciation of places of cultural significance.
Paul Connett, Heritage Principal - TTW

Our heritage engineers provide strategic advice to ensure the right balance between conservation of heritage materials, structure and functionality. They employ the latest technology and work with high-performance materials to increase longevity and lower maintenance costs.

We recognise the importance of preserving the past for future communities and are committed to protecting the integrity of heritage structures.


We are specialists in:

  • Historical materials
  • Construction methods
  • Engineering conservation
  • Reuse and adaptation of existing structures
  • Structural and façade diagnostics and repair


  • Diagnostic engineering
  • Timber, steel, wrought iron, cast iron, concrete, brick and stone
  • Seismic strengthening
  • Historic masonry
  • Remedial repairs
  • Adaptive reuse
  • Floors + walls + parapet strengthening
  • Alterations and additions to heritage structures
  • Protection


  • Waterproofing
  • Damp proofing
  • Assessment of rising and falling damp
  • Flashing and capping’s
  • Gutters and downpipes
  • Roof membrane

Inspections & Reports

  • Dilapidation reports
  • Condition assessment
  • Heritage structural reports
  • Structural management plans
  • Feasibility reports
  • Maintenance work plans
  • Land and Environment Court expert witness
  • Statements of heritage impact
  • Due diligence
  • Peer reviews
  • Expert witness

Façade & Windows

  • Façade remediation and repairs
  • In-depth experience in materials: sandstone and brick remediation, faïence, stone masonry, reinforced concrete and steel
  • 19th and 20th Century construction
  • Remediation of window frames: steel, cast iron, bronze and timber
  • Full window replacement – replication
  • Glazing: Upgrade of heritage windows to satisfy acoustic and ESD requirements

Project Experience

Campbell’s Stores

The refurbishment of this prominent heritage structure encountered complex challenges demanding expert heritage engineering. Our primary focus was the overriding concern for the conservation of an existing State Heritage Register listed building. This involved input and design considerations from many stakeholders, design and heritage professionals and builders. Collaboration and constant communication is key to the…

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50 Martin Place

The redevelopment of a neglected bank building at 50 Martin Place required attention to heritage requirements to deliver a sympathetic, yet contemporary and stylish new global financial headquarters for the Macquarie Group. The unique, ambitious structural design involved close collaboration between engineers, architects and the construction team to address heritage requirements; geometry of existing building;…

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The Revy, Darling Island

The conversion of a heritage-listed federation building into 44 luxury apartments meant that TTW needed to collaborate closely with both Architects and Heritage Consultants in order to achieve design outcomes while maintaining the heritage aspects of this unique building. Located on Darling Island, the original building sat on an area of reclaimed land adjacent to…

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The Mint

The Mint project involved a significant refurbishment and extension to the existing historic mint building.  Located in the heart of the city between the Barracks and Sydney Hospital on Macquarie Street, the once vacant coining factory was transformed into a campus-like headquarters for the Historic Houses Trust. Facilities include a grand exhibition space, flexible theatre/function…

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The Sandstone Precinct

TTW’s expertise in both structural and heritage engineering was a critical consideration for the developers of an exciting new luxury hotel, which involves the adaptation of two existing heritage buildings in Sydney’s “Sandstone Precinct” on Bridge Street. The Education Building will involve the addition of four levels above the existing seven storeys, and the excavation…

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Anzac Memorial Centenary Project

The Anzac War Memorial is a landmark building located at the southern end of Hyde Park, Sydney. The original building completed in 1934, is a concrete structure, clad in stone, designed by Charles Bruce Dellit. As part of the NSW Centenary of Anzac, the redevelopment intent was to construct new education and interpretation facilities, including…

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