AQS, QS, SQS & MQS – Roles & Responsibilities Explained

As with most professions, Quantity Surveying has a clear career ladder based on competency and experience. From entry-level to senior leadership, each stage comes with its own responsibilities and expectations. In this article, we’ll break down the key roles: Assistant Quantity Surveyor, Quantity Surveyor, Senior Quantity Surveyor, and Managing Quantity Surveyor.

Keep in mind that responsibilities may vary between companies—what follows is a broad overview of what to expect at each level.

Assistant Quantity Surveyor

Often the entry point into the profession, an Assistant Quantity Surveyor (AQS) supports more senior staff. Key responsibilities typically include:

  • Gathering and organising cost data
  • Assisting with cost estimates and budgets
  • Helping assess supply chain accounts
  • Assisting with Applications for Payment and invoices
  • On-site measurement of works
  • Attending meetings with contractors and suppliers

This role is about building foundational knowledge and gaining exposure to live projects.

Quantity Surveyor

A step up in responsibility, a Quantity Surveyor (QS) takes on a wider range of duties while often managing smaller projects independently. In addition to the above, tasks may include:

  • Preparing detailed cost estimates, BoQs, budgets, and prices
  • Negotiating contracts and agreements
  • Managing supply chain accounts
  • Preparing Applications for Payment and invoices
  • Monitoring and reporting on financial performance of projects

At this stage, autonomy increases and the QS becomes more client-facing.

Senior Quantity Surveyor

The Senior Quantity Surveyor (SQS) role involves a higher degree of leadership and technical expertise. Responsibilities typically include:

  • Managing and mentoring junior surveyors
  • Leading on complex commercial disputes, including valuations, change management, and final accounts
  • Representing the company in client and stakeholder meetings
  • Taking responsibility for major projects or packages of work

Senior QSs act as trusted advisors within the project team and play a crucial role in safeguarding project profitability.

Managing Quantity Surveyor

At the top of the commercial ladder is the Managing Quantity Surveyor (MQS). This position combines technical knowledge with strategic leadership. Typical responsibilities include:

  • Setting the overall strategy and direction for the QS team
  • Overseeing the financial performance of all projects within the business unit
  • Representing the company to clients, stakeholders, and external partners
  • Driving consistency and high standards across all commercial activities

The MQS balances commercial oversight with team leadership, ensuring projects deliver both profit and client satisfaction.

Conclusion

The Quantity Surveying career path offers a clear progression from entry-level assistant roles through to senior management. While responsibilities evolve at each stage, the core focus remains the same: managing costs, contracts, and value within construction projects.

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