Quantity Surveying Services International (QSSi) is a full-service quantity surveying firm based in Calgary, Alberta. The company specializes in providing comprehensive cost analysis and advice to enhance project profitability and support successful outcomes in legal cases. QSSi adopts a direct approach, helping clients manage risks and achieve their project goals.

QSSi offers a variety of services tailored to the construction industry, including conceptual estimating, mortgage monitoring, cost planning, project financing, and insurance appraisals. They also provide expert testimony in legal disputes, oversee construction loan compliance, conduct reserve fund studies, and assist with risk mitigation and contract formation. The firm is dedicated to delivering high-quality analyses and strategic planning to support both large-scale projects and individual clients.