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Expert Witness

Qualified quantum expertise for claims, disputes, and litigation and arbitration support.

Expert Witness
and Dispute Resolution Services

Construction disputes typically require a qualified quantity surveyor to provide expert evidence on quantum: the value of amounts claimed or in dispute.

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We are experienced across a range of dispute resolution and determination processes - from negotiation and mediation to arbitration and litigation - for dispute matters on major projects (infrastructure and energy projects) and building and property development projects. 

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We also provide dispute management, commercial and technical support, and independent assessment of quantum for matters which are not subject of legal proceedings.​

Our Dispute Experience

BMD Consult has provided dispute services for a range of matters, including:

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  • Quantum expert for litigation matter related to disputed costs for landslide rectification works at a property in New South Wales

  • Quantification reports, technical particulars, and commercial and technical advisory through dispute process for matter in arbitration related to design services provided to an infrastructure project.

  • Commercial and technical advisory through dispute process for arbitration matter concerning the capital cost of civil and structural design on a major infrastructure project.

  • Quantification report, technical particulars, and commercial and technical advisory through dispute process for litigation matter concerning mitigation under project professional indemnity on a major infrastructure project.

  • Quantification report, technical particulars, and commercial and technical advisory through dispute process for arbitration matter related to shared joint venture costs on an infrastructure project. 

  • Quantification report and submissions for arbitration matter concerning delay, disruption and scope change impacts on a major road infrastructure project.  

  • Technical particulars for utilities scope change impacts on a major infrastructure project.

  • Submissions with technical substantiation and particulars of delays and disruption on several renewable energy projects. 

  • Quantification, submissions and responses for payment claim adjudication under security of payment legislation for various matters in New South Wales, Victoria, Queensland, Western Australia, and New Zealand.  

  • Quantum reports for defect rectifications for New South Wales Civil and Administrative Tribunal.

Combined Major Projects and Independent QS Capability

We are very experienced providing services in dispute matters for both major projects (infrastructure and energy) and building projects. 


Major projects, with high-value commercial disputes, typically require a quantum expert to further assess and verify quantum calculations prepared by the claimants or counterclaimants. Substantial quantum on major projects usually relates to delay and prolongation claims, for which a quantum expert verifies project running and overhead costs as an average daily rate for delay and prolongation compensation. 


Building and property development project disputes are likely to require a quantum expert with quantity surveying and independent estimation capabilities, familiar with quantification, estimation, construction costs, metrics, and unit rates. 


Our practical experience preparing quantum and articulating impacts with technical particulars has improved clarity and efficiency and substantially reduced costs for dispute proceedings, including when a separate quantum expert witness, specialising in major projects and high-value commercial disputes, is also engaged.

Credentials

BRENDAN MCDERMOTT | Registered Expert Witness

BA (Hons) | BSc (Hons) | LL.M | MRICS | MAIQS | CQS

 

Our expert witness services are provided by a Registered Expert Witness, Australian Institute of Quantity Surveyors (AIQS) Certified Quantity Surveyor, and chartered Member of the Royal Institution of Chartered Surveyors (RICS) with testifying experience.

Services

Quantum Expert Witness

Expert Reports & Evidence

Quantum expert witness reports and testimony for dispute and legal proceedings, provided as a ‘clean’ expert engaged and instructed by a party’s legal representatives.

Quantum Expert Witness

Dispute Support

Support and management services, working closely with a party to dispute proceedings to  prepare and assess quantum and provide commercial and technical clarity to legal representatives and appointed expert witnesses.

Construction Dispute Management and Support

Commercial Resolution
Support

Commercial and advisory services to a contracting party to support resolution of matters of commercial difference which are not subject to legal proceedings.

Quantum Expert Witness

Independent Assessment

Independent valuation and assessment of matters of dispute to support  resolution and negotiated outcomes.

Who We Work With

Courtroom Argument Scene

Law firms

Law firms seeking a registered Quantum Expert (‘clean’ expert) to provide expert reports and testimony in legal dispute determination proceedings.

Close-up of someone with a construction drawing

Contract Party

A party to a construction contract requiring quantum and technical support to manage or resolve disputes and commercial differences.

Quantity Surveyor

Acknowledgement of Country

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BMD Consult acknowledges the Traditional Owners of the lands on which we work on, and pay our respects to Elders past, present, and emerging.

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We acknowledge the stories, traditions, and living cultures of Aboriginal and Torres Strait Islander peoples on this land and commit to building a brighter future together.

+61 469 625 530

Phone.

Email.

BMD Commercial Pty Ltd (Est. 2019)

All rights reserved © 2026

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