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

We provide strategic advice to ensure the right balance between conservation of heritage materials, structure and functionality, whilst employing the latest technology. We work with high performance materials to increase longevity and lower maintenance costs.

We are specialists in; Historical materials, construction methods, engineering conservation, reuse and adaptation of existing structures, and structural and façade diagnostics and repair.

Expertise + Added Value

Inspections + Reports

  • Dilapidation Reports
  • Condition Assessment
  • Due Diligence
  • Feasibility Reports
  • Heritage Structural Reports
  • Statements of Heritage Impact
  • Structural Management Plans
  • Maintenance Work Plans
  • Peer Reviews
  • Land and Environment Court Expert Witness


  • Rising and falling damp
  • Flashings and capping
  • Gutters and downpipes
  • Roof membranes

Façade & Windows

  • 19th and 20th century construction
  • Materials: sandstone, brick, faience, reinforced concrete, wrought iron, cast iron, steel and timber
  • Window frames assessment: steel, cast iron, bronze and timber
  • Façade retention, remediation and repairs
  • Glazing upgrades of heritage windows to satisfy acoustic or ESD Requirements or full window replacement and replication


  • Diagnostic engineering
  • Structural strengthening
  • Seismic strengthening
  • Adaptive reuse
  • Alterations and additions to heritage structures
  • Protection

Project Experience

Campbell’s Stores & Campbell’s Promenade

This prominent heritage structure refurbishment encountered complex challenges demanding expert civil, flood, traffic, structural and heritage engineering. One of our primary focuses was the overriding requirement for conservation of Campbell’s Stores, an existing State Heritage Register-listed building. This involved input and design considerations from many stakeholders, design and heritage professionals and builders. The existing structure…

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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 prominent, Government owned sandstone buildings in Sydney’s “Sandstone Precinct” on Bridge Street; the Lands and Education Department Buildings. Constructed between c1876-1892 and c1912-1930 respectively, both buildings are listed…

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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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Hyde Park Barracks Passenger Lift Enclosure

The UNESCO World Heritage- Listed Hyde Park Barracks underwent a major $18 million revamp. TTW heritage team was engaged to engineer the installation of a new glazed lift structure, providing equal access to all three levels of the museum, previously accessible by stairs only. Given the constraints of the World Heritage-listed building, Sydney Living Museums…

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Shell House

Located in the heart of the Sydney CBD, Brookfield Place Sydney (formerly known as Wynyard Place) development consists of three projects: The Tower, a full demolition and rebuild of a new 27-storey tower and the restoration of two adjacent heritage-listed buildings, Shell House and Beneficial House. Engineered by TTW, the project is designed by Make…

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