Who Does What on a Construction Project

A construction project runs on clearly defined roles. Understanding what a head contractor does, and how that differs from a project manager, a site manager and a contract administrator, helps developers know who is accountable for what at every stage. Confusion over responsibility is a common source of delay. The titles below appear on most multi-residential, commercial and industrial projects across Greater Sydney. The exact structure varies with project size, but the functions remain consistent.

The Head Contractor
The head contractor holds overall responsibility for delivering the project. This is the party the client contracts with to construct the building, and the party accountable for programme, cost, quality, safety and compliance across every trade on site. A head contractor engages and manages subcontractors, coordinates the construction programme, controls procurement and reports to the client throughout the build. When something goes wrong on site, the head contractor owns the resolution. Buildland operates as head contractor, which means single point accountability from establishment through to handover.

The Project Manager
The project manager runs the project from a planning and coordination standpoint. Where the head contractor is the delivering party, the project manager drives the programme, budget and stakeholder coordination that keep delivery on track. Responsibilities typically include programme management, cost tracking, procurement planning, consultant coordination and client reporting. The project manager works across the whole project rather than a single site, holding the commercial and programme view while the site team manages construction on the ground. It is worth noting that on some projects a client engages a separate project manager to act on their behalf. The head contractor’s project manager and the client’s project manager are different roles, and clear terms of reference between them prevent duplicated instruction.

The Site Manager
The site manager runs the physical site day to day. This is the person responsible for what actually happens on the ground, coordinating trades, managing sequencing, enforcing safety and maintaining quality as the building goes up. The site manager controls the daily programme, runs site inductions, manages subcontractor coordination and holds the line on workmanship. Strong site management is where programme discipline becomes visible. A well-run site is quiet, ordered and moving, and that is largely the site manager’s work.

The Contract Administrator
The contract administrator manages the commercial and contractual side of the build. This covers the paperwork that governs cost and scope, and it protects both the client and the builder when circumstances change. Core responsibilities include processing progress claims, administering variations, managing subcontractor agreements and maintaining the contractual record. When a variation arises, the contract administrator documents it properly so that cost and scope stay transparent. Disciplined contract administration is what keeps a project’s commercial position clear at every stage.

The Consultants and the Certifier
A construction project also relies on external parties the head contractor coordinates with rather than employs. Architects and engineers hold the design intent. Specialist consultants advise on services, fire, acoustics and facades. The certifier is independent of the builder and verifies that construction complies with the approved documentation and the relevant codes. The head contractor coordinates access and information for all of these parties, but the certifier’s independence is deliberate and important.

How the Roles Work Together
On a well-run project these roles interlock rather than overlap. The head contractor carries accountability. The project manager holds the programme and commercial view. The site manager delivers on the ground. The contract administrator keeps the commercial record clean. The consultants and certifier hold design and compliance. Problems tend to arise when responsibility is unclear rather than when it is divided. A capable builder makes the lines of accountability obvious from the outset.

Planning your next project?
Buildland works as head contractor for developers across Greater Sydney, delivering multi-residential, commercial and industrial projects. If you have a project in the pipeline and want to discuss delivery, our team is available. Contact us today on 02 7966 0200 or email info@buildland.au.