A quantity surveyor manages the costs and contractual aspects of construction projects. They estimate budgets, measure construction work, prepare tender documents, assess payments and track changes to project costs.

Their work helps clients and contractors understand what a project should cost, how money is being spent and what financial risks need attention. In South Africa, quantity surveyors work alongside architects, engineers and contractors on building and infrastructure projects.

What Are a Quantity Surveyor’s Main Responsibilities?

A quantity surveyor’s duties depend on the project, their appointment and whether they work for the client or contractor. Their involvement can extend from early planning to the final financial settlement.

1. Estimate Construction Costs

Before construction begins, a quantity surveyor estimates the likely cost of the proposed work. They consider drawings, specifications, quantities and available cost information to help establish a realistic budget. As the design develops, they update estimates and explain how design decisions affect affordability.

2. Measure Work and Prepare Bills of Quantities

Quantity surveyors measure construction work from drawings and specifications. This process, often called taking off quantities, can be used to prepare a bill of quantities (BOQ).

A BOQ describes and quantifies work so contractors can price it on a consistent basis. It also supports the financial administration of the construction contract.

3. Help Prepare and Evaluate Tenders

Quantity surveyors contribute to tender and contract documentation. They assess pricing and help clients understand the financial implications of competing offers. For example, a low tender price may need closer examination if important work has been excluded or allowances appear insufficient.

4. Monitor Costs During Construction

Once work starts, quantity surveyors track expenditure and report on the expected final cost. They assess the financial effect of changes and help the project team make informed decisions.

5. Value Completed Work and Changes

Quantity surveyors measure and value work in progress to support payment assessments. They also evaluate variations, changes to the originally agreed work and their effect on costs.

6. Agree the Final Account

Towards completion, quantity surveyors work through the final financial position, including agreed changes and outstanding amounts. Their role is to help reach a settlement in accordance with the contract.

A Practical Example of Quantity Surveying

Imagine a company planning a new office building. Before construction, the quantity surveyor helps estimate the budget and assess whether the proposed design is affordable. They contribute to documents used to obtain contractor prices.

During construction, the client requests a larger reception area. The quantity surveyor assesses the additional cost and updates the financial forecast. They also value completed work as the project progresses.

At completion, they help establish the final amount payable. This illustrates why quantity surveying involves more than calculating material costs: it connects measurement, financial planning and contract administration throughout a project.

What Skills Does a Quantity Surveyor Need?

The work calls for a combination of technical knowledge and clear communication. Useful skills include:

• Numerical accuracy: checking measurements, quantities and calculations.

• Analytical thinking: comparing costs and investigating discrepancies.

• Construction knowledge: understanding drawings, materials and building processes.

• Contract knowledge: interpreting payment terms and contractual responsibilities.

• Communication and negotiation: explaining financial information and resolving disagreements.

• Digital skills: using spreadsheets and relevant measurement or cost-management software.

Attention to detail matters because small errors in quantities or pricing can affect the project’s financial position.

Quantity Surveyor vs Project Manager: What Is the Difference?

A quantity surveyor focuses on construction costs and commercial matters. A project manager coordinates the wider delivery of a project, including schedules, resources, communication and progress.

For example, if a design change is proposed, the quantity surveyor may assess its cost while the project manager coordinates its effect on the programme and team. The roles overlap in budgeting and risk management, but they require different specialist knowledge.

How Do You Become a Quantity Surveyor in South Africa?

If your goal is to become a Professional Quantity Surveyor (PrQS), check the requirements of the South African Council for the Quantity Surveying Profession (SACQSP) before choosing a qualification.

The route generally involves:

• Completing an accredited or recognised qualification that meets the relevant academic requirements.

• Registering in the appropriate candidate category.

• Completing the required supervised professional experience.

• Meeting the applicable Assessment of Professional Competence requirements.

The route depends on your qualification and circumstances. Consult the SACQSP’s registration guidance rather than assuming that any construction-related qualification leads to professional registration.

Can Project Management Training Help?

Project management training can develop complementary skills in planning, budgeting, team coordination and stakeholder communication. These skills can be useful for people already working in construction or exploring broader project roles.

A project management qualification does not replace the quantity surveying education and professional registration requirements. If you are interested in developing project coordination skills, explore iFundi’s programme range and enquire about suitable training options.