What a General Contractor Does on a Building Project

On almost every building project there is one firm that turns drawings into a finished structure: the general contractor. It takes the design produced by architects and engineers, organises the labour, materials, plant and specialist trades needed to build it, and carries the contractual responsibility for delivering the work to the agreed quality, time and price. Owners often deal with it more than with anyone else on the team, yet its role is frequently misunderstood.

This article sets out what a general contractor does, how the role differs from the designers and from the specialist trades, how builders are licensed and graded in Singapore, and what an owner should look at before signing. It is written from the perspective of a practising structural engineer who works alongside contractors on site, not as a sales pitch for any particular procurement route.

The role of a general contractor in plain terms

A general contractor is the party that contracts directly with the owner (the employer) to carry out the construction works. In most traditional arrangements it does not design the building; it builds what the consultants have specified. Its core job is coordination: sequencing trades, managing the site, buying materials, hiring and supervising workers, and making sure each element is built in the right order and to the right standard.

In practice, much of the physical work is done by others. A general contractor will typically self-perform some trades, often the structural frame or general builders’ work, and engage subcontractors for piling, mechanical and electrical services, waterproofing, façades, finishes and so on. The difference between the head contract and these supporting contracts is explained in our guide to main contractors and subcontractors. The key point for an owner is that, under a conventional contract, the general contractor remains answerable to them for the whole of the works, including the parts it subcontracts.

Day-to-day responsibilities on site

The work a general contractor carries out falls into a few broad areas:

Planning and programming — preparing the construction programme, identifying the critical sequence of activities and updating it as the job progresses.
Procurement — buying materials, hiring plant and letting subcontract packages.
Site management — setting up hoarding, access, temporary works, welfare facilities and storage, and keeping the site organised.
Safety — planning safe methods of work, carrying out risk assessments and controlling hazards across all trades on site.
Quality control — checking that work matches the drawings and specification before it is covered up or inspected.
Commercial administration — submitting progress claims, pricing variations, and keeping records that support entitlement to time or money.

Good contractors make these activities visible. They produce a realistic programme, often built with the critical path method, submit method statements before risky operations, and keep a clean paper trail. Poor ones tend to fail quietly in exactly these areas, and the consequences surface later as delays, defects and disputes.

How general contractors are licensed in Singapore

In Singapore, builders carrying out building works that require approval under the Building Control Act must hold a builder’s licence issued by the Building and Construction Authority (BCA). The licensing scheme, set out in the Act and the Building Control (Licensing of Builders) Regulations 2008, has general builder licences in two classes and a separate specialist builder licence for defined specialist works such as piling, ground support and structural steelwork. A Class 1 general builder may undertake projects of any value, while a Class 2 general builder is limited to contracts below a value threshold that BCA publishes and may revise, so check the current figure on BCA’s site.

The licence requires the firm to appoint an Approved Person to direct the business and a Technical Controller with relevant qualifications and experience to supervise the building works. This is distinct from the Contractors Registration System, which grades firms by workhead and financial capacity for public sector tendering. Our article on the BCA contractor registry explains how to look a firm up. For most residential renovation that does not need building plan approval, the licensing requirement may not apply, which is why owners of small jobs should be particularly careful about who they appoint.

General contractor versus design-and-build contractor

Under the traditional route, the owner appoints consultants to complete the design, then tenders it to general contractors who price the drawings and specification. The owner keeps control of the design, and the general contractor’s risk is mainly about building it as drawn.

Under design and build, the contractor takes on design responsibility as well, usually by engaging its own architects and engineers. This gives the owner a single point of responsibility but less direct control over design decisions. A general contractor can operate in either mode; what changes is the scope of its obligations. Which route suits a project depends on how settled the design is, how much the owner wants to influence details, and how risk should be shared.

A third variant is the management-type arrangement, where a construction manager coordinates separately contracted trade packages on the owner’s behalf. That shifts more risk back to the owner and needs an experienced client team.

Risks a general contractor carries, and those it does not

Under a typical lump-sum contract, the general contractor takes the risk of its own productivity, pricing errors, subcontractor performance and the cost of materials within the price, subject to whatever adjustment mechanisms the contract contains. If it finishes late for reasons within its control, it may be liable for liquidated damages. If its work is defective, it must put it right during the defects liability period.

It generally does not carry the risk of design errors made by the owner’s consultants, instructed changes, or delays caused by the owner. These usually give rise to variations and extensions of time. Unforeseen ground conditions are a common grey area; the answer depends on the contract wording and on what site investigation information was provided at tender. This is a general description, not legal advice, and the actual allocation always turns on the specific contract.

Choosing a general contractor

Price matters, but the lowest bid is rarely the cheapest outcome. When comparing tenders, look at:

Licensing and registration appropriate to the size and type of work.
Track record on comparable projects, ideally with references you can call.
Financial standing, since a contractor that runs out of cash mid-job is a serious problem.
Who will actually run the site: the project manager and site supervisor matter more than the company brochure.
Clarity of the tender: exclusions, provisional sums and assumptions that could become claims later.

An engineer’s or quantity surveyor’s review of the tenders can catch qualifications that change the real price. For renovation-scale work, our guides to choosing a renovation contractor and reading quotations cover the same principles at a smaller scale.

Working well with your general contractor

The relationship works best when roles are clear. The owner, through its consultants, defines what is to be built and responds to queries promptly. The general contractor builds it, flags problems early and prices changes transparently. Most disputes trace back to incomplete design at tender, late information during construction, or verbal instructions that were never recorded.

From a structural standpoint, the contractor’s temporary works, sequencing and quality of concreting and reinforcement have a direct effect on the finished building. Regular inspections by the engineer, documented hold points before concrete pours, and an open channel for technical queries are worth far more than any clause in the contract.

Frequently asked questions

Is a general contractor the same as a main contractor?

In everyday use the terms are largely interchangeable: both describe the firm that holds the head contract with the owner and takes overall responsibility for the construction works. “Main contractor” emphasises its position in the contract chain above the subcontractors, while “general contractor” emphasises that it coordinates the general building work across many trades.

Does a general contractor need a BCA licence in Singapore?

Builders carrying out building works that require approval under the Building Control Act need a general builder or specialist builder licence from BCA, with the class depending on the type and value of work. Minor works that do not need building plan approval may fall outside the scheme, so for small jobs you should check what licences, registrations and track record a firm actually has.

Does a general contractor design the building?

Under a traditional contract, no: the owner’s architects and engineers design it and the general contractor builds it. Under design and build, the contractor takes on design responsibility, usually through consultants it appoints, and the owner then has a single party responsible for both design and construction.

Who supervises the general contractor?

The contractor supervises its own workers and subcontractors, while the owner’s consultants inspect and certify the work on the owner’s behalf. On projects under the Building Control Act, qualified persons appointed for supervision, supported by site supervisors, check that structural works follow the approved plans.

Need an independent structural view on a contractor’s proposals, temporary works or site quality? Talk to our consultancy or get in touch.