Detailed Case Study

Scope of Works and Services:

The project at 3 Knox Street, Double Bay, involved a design and construct fixed lump sum subcontract for aluminum window and door works. The scope was extensive, covering all phases from documentation and design to installation and final certification.

• Documentation and Design: The subcontractor was responsible for ensuring all work was in accordance with a comprehensive list of project documents, including architectural, structural, and engineering plans, as well as fire engineering reports, BASIX reports, and the construction program. This was a design-and-construct contract, meaning the subcontractor was also responsible for designing the systems and producing shop drawings for review and approval.

• Work Description: The project involved demolishing an existing residential unit and constructing two new two-story residential units. The subcontractor’s work was to provide all labor, materials, and equipment for the design, supply, delivery, installation, testing, and commissioning of the aluminum window and door systems.

• Specific Works by Level: The scope of work was detailed by floor:

  • Ground Floor: D01 Hinged Doors and Fixed Windows, and a frame only for D02 Hinged Doors.

  • Second Floor: A variety of fixed, awning, sliding, and hinged windows and doors (D01, W01, W02, W03, W04, W05, D02, W06, W07). This included automated awning windows.

  • Third Floor: An array of fixed, automated awning, bi-fold, and sliding windows and doors (W01, D01, W02, W03, W04, D02, W05, TFW06).

  • Roof: Fixed and automated awning windows (W01, W02).

• Additional Components: The subcontractor was also tasked with the supply and installation of powder-coated Capral EN3529 Aluminium Extrusions in various locations to form awnings. This included all necessary fixings, flashings, weather bars, and sealants to ensure a watertight barrier. The scope also explicitly included hardware, keying, and automation provisions.

• Site and Logistics: The subcontractor was required to familiarize themselves with site conditions and was responsible for all transport, storage, and security of their materials. They had to coordinate with Ultra's site management for all deliveries, including vertical lifting with the tower crane. The contractor also had to provide a full-time supervisor for site liaison and was required to make unlimited site visits to complete the work.

• Quality and Certification: The subcontractor was responsible for providing a 10-year warranty and ensuring the work met all relevant Australian Standards, BCA requirements, and authority satisfaction. This included testing, such as an on-site hose test, and providing all necessary certification and documentation. The subcontractor was also responsible for trade cleaning and applying a surface treatment to the glass to protect it from construction damage. The quote specified a retention period of 12 months after the builder's practical completion.

• Documentation: The subcontractor was required to submit key documents including a site-specific Safe Work Method Statement (SWMS), a Quality Plan, Materials Safety Data Sheets (MSDS), and Inspection Test Plans (ITPs) upon contract award.