By Greg Allan, tradesman and creator of Data First Coaching
Why do window and door installers carry more health and safety risk than other PCBUs?
Most window and door installers assume health and safety is the builder's problem, especially when the job is on someone else's renovation. Under the Health and Safety at Work Act 2015, that assumption does not hold. WorkSafe's Introduction to the Health and Safety at Work Act 2015 explains that all work and workplaces are covered unless specifically excluded, and that a PCBU, a person conducting a business or undertaking, can be an individual tradesperson or a company. A window and door installer who runs their own business, even as a sole operator with a couple of subbies, is a PCBU in their own right.
That matters because a typical job is rarely a ground floor swap. A measure for a sliding door or bifold set on an aluminium or timber frame often leads to a replacement window on an upper storey, a heavy glazed unit carried up a ladder or through a tight scaffold access point, on a site the installer does not control. The duty to manage that risk sits with the window and door business itself, not just with the head contractor.
Why does working at height and handling glass make this more than a paperwork exercise?
A sliding door track at the back of a house, a bifold opening across an upper level deck, a second storey gable window: all of that is working at height, and the Working at height in New Zealand guidance is clear that there is no minimum height threshold that excludes the work from needing to be managed. The same page names tradespeople who regularly access roofs and high points among those most exposed, and sets out that the first move should always be to find a way to eliminate the risk, for example doing as much frame and flashing preparation as possible at ground level before the unit goes in.
Where scaffolding is part of the job, whether the window and door installer's own crew erects it or a scaffolding subbie does, WorkSafe's Scaffolding in New Zealand guidance says work carrying a real risk of a fall must be notified to WorkSafe before it starts, and that everyone involved needs the training and certification the work calls for, not just years on the tools.
What must you do as the PCBU running your own window and door business?
As the owner, your starting point is what WorkSafe calls the primary duty of care: you must ensure, so far as is reasonably practicable, the health and safety of your crew, and make sure your work does not put anyone else, a builder's site team, a homeowner, a passer by, at risk. Appendix C: Health and Safety at Work Act duties sets out that you must try to eliminate a risk first, and only move to minimising it if elimination is not reasonably practicable, the same order of thinking as prepping a frame on the ground before it goes up a ladder.
That same page sets out two duties that often get missed on a renovation site. First, where you share duties with another PCBU, the builder managing the site, a scaffolding subbie, a glazing supplier delivering direct, you must consult, cooperate and coordinate with them, not assume their safety plan covers your crew. Second, you must give your own workers a genuine say in health and safety, not hand them a form to sign and move on. The Health and Safety at Work Act confirms that even a self-employed PCBU, an installer with no employees at all, must ensure their own health and safety so far as is reasonably practicable.
What extra duties apply when you install, manage or alter a structure?
Beyond the general PCBU duties, installing windows and doors puts you inside two more specific parts of the Act. If you manage or control a site, your own showroom, a storage yard, or a job you are running rather than subcontracting into, the Health and Safety at Work Act 2015 says you must ensure the site itself, and the way people get in and out of it, is without risk so far as is reasonably practicable. The same Act sets a duty on any PCBU who installs, constructs or commissions plant or structures, which covers a window and door installer fitting a new frame, to ensure the way it goes in does not create a risk.
There is a further duty that catches installers out: if you alter part of an existing structure, say reworking a header, changing a flashing detail, or enlarging an opening for a bigger sliding door, WorkSafe's guidance on upstream PCBU duties says that change makes you a designer for that part of the work, carrying the same duties a designer carries. And if something serious does happen on a job, WorkSafe's notifiable events guide says the site should be left undisturbed until an inspector allows work to resume, with records of the event kept for a set period afterwards.
This is general information, not legal, tax or employment advice. Check your own situation with the body named here or a qualified adviser.
How do you keep on top of all this without losing a day to paperwork?
The honest answer sits in your own job records, not in memory. Which jobs this quarter involved scaffold access. Which subbies' certifications are current. Which sites had another PCBU running the show, so there was an actual coordination conversation on record rather than an assumption. That is a data first way of working: the real picture comes from what happened on each job, not from what the owner thinks happened at the end of a busy month juggling measures, installs and supplier lead times.
This is where AI agents earn their place in a window and door business. An AI agent is software that does a job the way you would do it, using your own prices, your own wording and your own rules, so it is not a generic form, it is your process running itself. One agent can hold the safety and coordination record against each job file as a quote turns into a measure and then an install. Another can flag, before a crew heads out, that a scaffold job needs a current certification on file, the same habit as scanning a site for safety issues as part of showing a customer what you know, which doubles as a signal to the builder deciding whether to keep handing your business the next renovation. That is what AI agents are for in a trade business: not a theory of what the crew does, but a working record of it, ready whether the question comes from a builder, a WorkSafe inspector or your own foreman.
Where can you check the current rules?
- Introduction to the Health and Safety at Work Act 2015, WorkSafe's plain English explanation of who a PCBU is and the primary duty of care.
- Appendix C: Health and Safety at Work Act duties, the duty to eliminate or minimise risk and to coordinate with other PCBUs on a shared site.
- Working at height in New Zealand, managing fall risk for any height, relevant to upper storey window and door work.
- Scaffolding in New Zealand, notification and training requirements for erecting and dismantling scaffold.
- Health and Safety at Work Act 2015, Subpart 2, the duties of PCBUs, including self-employed installers.
- Health and Safety at Work Act 2015, duties of a PCBU who manages a workplace or installs plant or structures.
- WorkSafe position on upstream PCBUs, when altering part of a structure makes an installer a designer with extra duties.
- What events need to be notified, notifiable events, site preservation and recordkeeping.
How does Data First Coaching approach this?
Data First Coaching does not start by treating health and safety as a form filled in once a year. It starts with the owner's own job data inside the Trade Business Intelligence, looking at which jobs carried height risk, which sites had another PCBU running the show, and where the safety conversation with a builder actually happened versus where it was assumed. That is usually where the real exposure sits, not in a missing policy document but in a gap between what the business does on site and what its records show. Greg Allan built his own trade business before building this method, and teaches installers to run a site safety scan as a way of “looking for opportunities to provide value to the customer because you know what you're looking at and the customer doesn't.” The how, built from each owner's own data, is worked through inside the Academy, among members who are open minded, innovative and willing to share, because the Trade Business Intelligence is powered by every member.
