The Arc Infrastructure Asset Valuation project, carried out for GHD, applied the Depreciated Optimised Replacement Cost (DORC) methodology to establish regulatory-compliant values for Western Australia's 5,500-kilometre freight rail network. This comprehensive valuation addressed post-COVID cost pressures and regional delivery complexities, providing robust asset valuations, sensitivity analysis, and benchmarking.

The Bayswater Station and Turnback project, part of Western Australia's METRONET programme, involved TAG Advisory seconding Andrew Neale as Senior Project Manager to the Evolve Bayswater Alliance. This engagement focused on project completion and close-out management for critical rail infrastructure upgrades.

The iconic Boorloo Bridge project involved TAG Advisory providing commercial support during peak construction and managing critical Watermain Relocation Works procurement. This engagement successfully addressed contractor performance issues, implemented strategic procurement solutions, and prepared DCT adjustments for Board approval.

The Bunbury Faster Rail project provided comprehensive cost estimation for in excess of 40 route alignment options to improve Perth-South West regional connectivity. This engagement delivered high-level cost advice supporting Multi-Criteria Assessment and detailed Class 5 Cost Estimate for the preferred alignment. The project ensured compliance with both PTA and Federal Government standards, establishing robust financial foundations for Business Case development and funding applications.

The Canning Bridge Bus Interchange project involves preparing independent Class 5 Cost Estimates for this crucial multimodal transport hub enhancement. This engagement addresses evolving design scope and navigates constructability challenges and operational impact to the existing rail and road network.

The Chidlow - York Road project focused on resolving complex Contractor claims for this regional road upgrade. This engagement provided independent expert advice on time and quantum matters, conducting forensic analysis of extension of time claims and variations, enabling fair commercial outcomes through systematic assessment of contractual entitlements.

The City West Station project provided comprehensive cost estimation services from concept design through to Feasibility Design and support of Project Definition Plan submission. This engagement addressed funding constraints through innovative scope refinement, developing estimates from Class 5 to Class 3 as both design and scope progressed. The project seeks to enable critical safety improvements through phased delivery strategies, including underpass construction to eliminate at-grade pedestrian crossings and critical replacement of of the existing Sutherland Street Rail Bridge.

The Cost Estimating and Commercial Services Panel appointment to Main Roads Western Australia's Service Area 2 recognises TAG Advisory's expertise in specialist contract support and complex claims resolution. This strategic panel arrangement, running from August 2023 with extension options to 2028, provides forensic analysis, strategic negotiation support, and sophisticated commercial advice for high-value contractual matters. The ongoing engagement demonstrates Main Roads' confidence in TAG Advisory as their trusted commercial advisor across metropolitan and regional projects.

The Eastern Goldfields Regional Prison project delivered comprehensive replacement cost estimates for insurance valuation of this critical regional infrastructure asset. This engagement addressed the substantial impact of remote regional location and post-COVID market impost on construction costs. The outcome identified significantly increased replacement values, ensuring adequate insurance coverage through detailed analysis of benchmarked rates, current market conditions and increased regional cost factors and withstood external challenge from Department of Justice challenge.

The Future of Fremantle project provided Class 5 Cost Estimates for transforming port lands following Westport relocation. This visionary urban renewal initiative required sophisticated cost assessment for converting industrial and port infrastructure into mixed-use precincts. The project established robust financial parameters for strategic planning, addressing decommissioning, remediation, infrastructure upgrades, and heritage preservation requirements for Western Australia's most significant waterfront transformation opportunity.

The Great Eastern Highway Bypass Interchanges project involved TAG Advisory providing extensive cost management and Federal funding support. This engagement encompassed independent cost reviews, high-level estimating across multiple interchange packages, and strategic assistance for funding applications. The project ensured robust budget foundations for this significant metropolitan transport upgrade, enabling informed staging decisions and strengthening Federal funding submissions through comprehensive cost substantiation and risk articulation.

The High-Capacity Signalling project engages TAG Advisory as Independent Estimator for this transformational metropolitan rail network modernisation programme. This complex engagement establishes budgets for significant capital investment over the next decade and subsequent maintenance costs. The project addresses unprecedented technical complexities in replacing legacy signalling systems whilst maintaining operations, providing Treasury-approved estimates that will enable increased service frequency and network capacity for Perth's growing metropolitan rail system.

The Nangetty Walkaway Bridge Replacement project, delivered for the City of Greater Geraldton through WGA, provided comprehensive cost management for this $9 million regional infrastructure project. This engagement included progressive cost estimates, Bills of Quantities and tender evaluation services addressing significant regional delivery challenges. The project achieved successful delivery within original budget estimates through strategic value engineering, robust procurement processes, and effective management of regional market conditions and contractor capacity constraints.

The Northam - Pithara Road project involved TAG Advisory providing quantum assessment for Main Roads and expert witness services for the State Solicitor's Office regarding complex contractor claims. This dual engagement addressed Building and Construction Industry (Security of Payment) Act 2021 (WA) proceedings through forensic cost analysis and independent expert reporting. The project facilitated successful pre-determination, avoiding formal Adjudication that preserved relationships and enabled project completion.

The Passenger Rail Transport Planning project involves preparing Class 5 Cost Estimates for 12 new rail alignment options. This comprehensive engagement supports Perth's strategic network expansion through high-level cost estimates informing Multi-Criteria Assessment processes. The project addresses diverse corridor characteristics including at-grade, elevated, and underground configurations, providing robust financial parameters for long-term rail network development decisions scheduled for completion in early 2026.

The Quantity Surveying and Cost Estimating Services Panel appointment, secured in August 2025, formalises TAG Advisory's trusted advisory relationship across PTA's infrastructure programme. This strategic panel arrangement provides comprehensive quantity surveying and cost estimating services across estimation, commercial and related advisory streams. The appointment enables seamless engagement across multiple concurrent projects, ensuring consistent, high-quality cost advisory support for Western Australia's critical transport infrastructure development over the potential five-year term.

The Rail Maintenance Services project engaged TAG Advisory as Independent Estimator for PTA's critical procurement of comprehensive rail maintenance across Perth's metropolitan network. This engagement required rigorous analysis of complex pricing structures for routine maintenance, reactive repairs, capital renewals, and emergency response capabilities. The services delivered successful objective cost assessment, ensuring value for money and pricing sustainability for these essential services maintaining improved railway safety and reliability.

The Rail Revitalisation Program engages TAG Advisory as Independent Estimator for PTA's transformational 10-year infrastructure renewal initiative. This comprehensive programme addresses critical asset lifecycle requirements across track, signalling, overhead line equipment and associated systems.

The Road and Bridge Project Management Panel appointment with Main Roads, secured in March 2023, recognises TAG Advisory's project management expertise across road and bridge infrastructure. This strategic five-year panel arrangement enables seamless engagement for the planning and delivery of services across metropolitan and regional projects. The appointment facilitates rapid mobilisation of experienced project management resources, supporting Main Roads' extensive programme of works.

The Tonkin Highway Extension project engaged TAG Advisory as Commercial Advisors to Main Roads for Package 1 and Package 2 tender evaluation and ongoing delivery support. This transformative transport infrastructure programme required sophisticated commercial assessment of multiple proposals. The project established robust commercial frameworks through comprehensive tender evaluation, supporting successful contract awards and continuing delivery phase support to protect commercial interests whilst enabling efficient construction of this critical freight and regional connectivity improvement.

The Toodyay Road Upgrade project provided comprehensive cost management and procurement services for this critical Wheatbelt region infrastructure improvement. This engagement addressed significant regional delivery challenges including geological uncertainty through innovative Bills of Quantities and Schedule of Rates structuring. The project achieved compliant tenders within budget parameters through strategic procurement approaches, with TAG Advisory continuing support through construction commencing in early 2026 to ensure successful delivery.

The Westport programme engagement demonstrates TAG Advisory's strategic advisory capability across Western Australia's transformational port development and urban renewal initiative. This multi-faceted engagement has provided independent cost estimates, commercial advisory services, and tender evaluations across multiple projects including Future of Fremantle, Rail and Road IPT's, and RORO/Break Bulk relocation. The project leverages extensive maritime infrastructure expertise to support robust investment decisions for this multi-billion dollar programme shaping Western Australia's economic future.