Bringing Cost Certainty and Commercial Control to Construction Projects
Chartered Quantity Surveyors providing Cost Planning, Contract Advice, and Expert Witness Services across Australia — helping developers, builders, and legal teams reduce risk and deliver successful outcomes.
Accurate Cost Planning & Estimating
Contract Administration & Claims Management
Independent Expert Witness & Dispute Support
Trusted by Developers, Builders & Legal Professionals
Years of Professional Excellence
Estimations&
Cost Plans Delivered
Major Infrastructure
& Commercial Projects
Client Retention
& Satisfaction Rate
Independent Construction Cost Experts delivering clarity, control, and confidence across every stage of your project.
For reliable, accurate quantity surveying and cost consultancy, speak with QCost Consultants today.
Supporting projects across Sydney, Brisbane, and Australia-wide.
Cost Certainty and Commercial Control for Every Project
At QCost Consultants, we provide expert quantity surveying and construction cost consultancy services to help clients control costs, reduce financial risk, and deliver successful projects.
We support developers, builders, architects, and legal professionals with accurate cost planning, contract advice, and independent expert services at every stage of the project lifecycle
How We Add Value
Why Choose QCost Consultants?
Accurate Cost Planning & Estimating
Clear, reliable cost forecasts to support better decisions and protect your project budget.
Construction Cost & Commercial Advisory
Practical advice to help you maintain financial control and manage project risk.
Contract Administration & Claims Support
Expert guidance on variations, progress claims, and contractual matters.
Independent Expert Witness Services
Trusted by legal teams to provide objective reports and dispute resolution support.
With a commitment to professional excellence and independent advice, we deliver timely, practical, and commercially focused solutions that help you reduce costs, strengthen project outcomes, and minimise risk.
- Certified Quantity Surveyors
- Accurate Cost Estimation
- Independent Advice
Objective, unbiased cost advice
Trusted for decisions and disputes
- Commercial realism
Advice grounded in real market conditions
Practical, financially sound outcomes
- Clear communication
Complex matters, clearly explained
So you can decide with confidence
- Accountability
Reliable, professional delivery
Advice you can depend on
Construction Cost, Commercial & Dispute Advisory Services
We provide independent construction cost and commercial advice to help clients control costs, manage risk, and deliver successful project outcomes.
Cost Planning & Estimating
Accurate cost plans and estimates to support feasibility, design decisions, and budget control.
Helping you avoid cost overruns from day one
Quantity Surveying & Commercial Management
End-to-end commercial support including valuations, variations, contract administration, and cost control.
Protecting your position through the construction phase
Expert Witness & Dispute Services
Independent, court-ready reports and advice to support construction disputes, claims, and resolution proceedings.
Supporting NCAT, court proceedings, and expert reports.
Independent Advice. Commercial Insight. Proven Outcomes Delivering clarity, control, and confidence across every stage of your project.
Choosing the right cost consultant can significantly impact your project’s financial outcome.
At QCost Consultants, we combine independent advice, real-world commercial experience, and technical expertise to help clients control costs, manage risk, and achieve successful outcomes.
Independent, Defensible Advice
Clear, objective cost advice that stands up to scrutiny in projects, funding reviews, and dispute proceedings.
Commercially Realistic Cost Planning
Cost advice grounded in real project constraints and market conditions, ensuring practical and achievable budgets.
Commercial Control Throughout Delivery
Ongoing support to manage valuations, variations, and claims, helping you maintain control as projects evolve.
A Practical, Commercial Approach to Cost and Project Control
Early engagement to define project scope, risks, and objectives, ensuring a clear and effective role within the project team.
Cost advice tailored to project complexity, delivering clear, decision-ready insights — not unnecessary detail.
Continued involvement through delivery, providing timely advice on valuations, variations, and emerging commercial issues.
At QCost Consultants, our team comprises professionally qualified Chartered Quantity Surveyors with deep industry experience across Australia and internationally.
We provide independent, commercially focused advice supported by the highest standards of professional accreditation, technical expertise, and integrity.
Meet the Team
Buddhika Jayatillake (Jay)
Director & Principal Consultant
MBA BSc(Hons QS) FRICS FCIOB FAIQS (CQS)
Buddhika Jayatillake (Jay) is the Founder and Managing Director of QCost Consultants, with over 30 years’ experience in quantity surveying, construction cost management, and commercial advisory across Australia and internationally.
Jay provides independent, commercially focused advice on complex projects including cost planning, contract management, and dispute resolution, supporting developers, builders, and legal professionals.
A Chartered Quantity Surveyor and Chartered Construction Manager, Jay is recognised for delivering clear, defensible, and commercially sound advice.
- Master of Business Administration (MBA), University of Durham, UK
- Bachelor of Science (Honours), Quantity Surveying
- Fellow of the Royal Institution of Chartered Surveyors (FRICS)
- Fellow of the Chartered Institute of Building (FCIOB)
- Fellow of the Australian Institute of Quantity Surveyors (FAIQS)
- Certified Quantity Surveyor (CQS)
Independent Cost Advice You Can Rely On
Whether you are planning a project, managing delivery, or dealing with a complex commercial issue, QCost Consultants provide independent, commercially focused advice to help you make informed decisions and protect your financial outcomes.
Speak with a senior consultant to discuss your project and explore how we can support you.
Speak with a senior cost consultant to discuss your project.