BG&E provided structural civil engineering, materials and durability, flooding and hydrology, and construction engineering services for the on expansion of the Castle Towers Shopping Centre and surrounding precinct in Sydney.

This project was highly complex, involving both significant technical capability along with an evolving scope of work.

BG&E was engaged in multiple packages of work for the Castle Towers project

• Castle Towers Site A Redevelopment – ongoing.
• Castle Towers Site B Subdivision – ongoing.
• Castle Towers Zone 3 Redevelopment – ongoing.
• Pennant Street Roadwork Widening – delivered for IFC.
• Woodward Building Development – ongoing.

Castle Towers Site B Subdivision

QIC subdivided the old Castle Hill Public School site located opposite the existing Castle Hills Shopping Centre on Pennant Street. The subdivision has created eight lots, all high- density mixed-use residential and commercial buildings, plus one park.

A key challenge of the Site B subdivision was the need to modify the original road designs to accommodate the proposed building from the Woodward Building Development that was relocated to within the subdivision site, before the roads in Site B were designed.

Castle Towers Zone 3 Redevelopment

Zone 3 of the Castle Towers Shopping Centre, originally opened in 1979, was redeveloped by QIC. The works involved partial demolition of the existing structure while maintaining other components of the building and ensuring key areas and tenant areas remained operational throughout construction.

All works were situated within the same structure, with the new structures extended above the existing retail sites and car park.

The redevelopment involved

• Upgrading existing retail spaces.
• Constructing a new, mixed-use building for commercial and retail use.
• Constructing a new hotel.

The civil team’s scope of services included stormwater design, onsite detention, water quality, overland flow, integration with the existing drainage system of the shopping centre, and design of public domain footpaths and driveways.

Significant challenges of the redevelopment included

• Coordination with three different architects, each responsible for various aspects of the development.
• Management of services and civil items traversing the site, which was still operational and accessible to the public.
• The placement of onsite detention tanks which was complicated by the existing Sydney Metro tunnels beneath the site that limited options for underground installation, requiring placement within the proposed building structure.