Onboarding subcontractors under WHS: the principal contractor's checklist

Every time a subcontractor joins your site, their compliance becomes part of your risk. Under the model WHS laws, duty holders who share a workplace must consult, cooperate and coordinate, and more than one PCBU can owe a duty to the same worker at the same time. In practice that means you need to know, before a subbie starts, that they can do the work safely and are properly covered. This guide sets out what to collect, why collecting is not the same as checking, and how to keep the picture live as insurances lapse and tickets expire mid-project. Requirements are administered by each state and territory regulator, so check the rules where you work.

Why a subcontractor's compliance is your risk

The WHS laws deliberately spread duties across everyone who influences a workplace. When you engage a subcontractor, you do not hand off your safety duty to them, you both hold duties, and you must coordinate. If a subbie works unsafely, uninsured or unlicensed on your site, that is not only their problem: it can be your breach, your incident and your liability. That is why onboarding is a safety control, not an administrative formality.

What to collect

At a minimum, before a subcontractor starts, collect: their SWMS for any high-risk construction work they will do; their public liability insurance and workers' compensation (or a personal accident policy for a genuine sole trader); the relevant licences and White Cards for the workers they are bringing; and any plant registration and pre-start records for equipment they will operate on site. For a construction project, this feeds directly into the principal contractor's WHS management plan and the obligation to obtain each SWMS before the high-risk work begins.

Collecting is not checking

This is where onboarding usually falls down: documents are gathered but never actually verified. A folder full of PDFs is not compliance. You have to check that each document fits: that the insurance is current and the cover amount and scope actually match the work being done; that each licence is the right class and in date for the equipment and the task; and, most commonly missed, that the SWMS is specific to this job, not a generic template with the subbie's logo on it. A current certificate of the wrong type, or a SWMS that describes a different job, is no protection at all. Verification is the step that turns collected paper into an actual control.

Keep it live through the project

The picture is not static. Insurances expire, workers' compensation renews annually, licences and White Cards lapse, and crews change part-way through a project, so a pack that was complete and correct on the day the subbie started can quietly go out of date weeks later, while they are still on your site. The goal is a live picture of your supply chain, with anything missing, mismatched or expiring flagged automatically, rather than a one-time check at mobilisation. That means re-checking currency on renewal dates, not just at the start.

Make it fast for everyone

Onboarding that is slow or chaotic costs both sides: subbies wait to start, and your team chases documents by email. A consistent request-and-verify process, the same checklist every time, documents submitted once and reused, expiry tracked automatically, gets compliant subcontractors on site faster and keeps the non-compliant ones out. Keeping every subcontractor's SWMS, insurances, licences and plant records against the job, with automatic flags before anything lapses, is exactly what contractor management software is built to do.

Subcontractor onboarding quick reference

• Shared workplaces mean shared duties, a subbie's compliance is your risk
• Collect SWMS, public liability and workers' compensation, licences and White Cards, and plant records
• Verify, don't just collect: cover current and matched, licences the right class and in date, SWMS job-specific
• Keep it live, re-check on renewal dates as insurances and tickets lapse mid-project
• A consistent request-and-verify process gets compliant subbies on site faster

Related reading: our SWMS guide, WHS management plans, and contractor management software. You can onboard subcontractors and keep their documents verified and current in Complys, free for 30 days.