We understand the appeal completely. The video makes it look simple, the parts are cheap, and paying a tradesperson for something that appears to be four turns of a spanner feels unnecessary. And for a small, defined set of tasks, the DIY instinct is fine. But plumbing punishes overreach in a way few home projects do, and after decades of being called to the aftermath, we can give you the four honest reasons the ambitious version rarely pays, along with a clear picture of what remains legitimately yours to do.
Reason one, in WA most of it is illegal
This is the reason that surprises people most. Western Australia has among the strictest plumbing regulations in the country, and the overwhelming majority of plumbing work, anything involving the water supply, drainage, sewerage or gas, must legally be performed by a licensed plumber. The homeowner’s lane is genuinely narrow, replacing tap washers and cartridges, swapping like for like parts inside a toilet cistern, changing a shower head, clearing accessible blockages by mechanical means. Beyond that lane, the work is unlawful regardless of how well it is done, and the penalties are real. The licensing regime exists because plumbing failures contaminate water, flood homes and, on the gas side, endanger lives, and the rules do not care how confident the video made you feel.
Reason two, your insurance is watching
The financial exposure is larger than the fine. Home insurance policies respond poorly to damage flowing from unlicensed work, and a claim traced to a DIY connection, a hose fitted without compliance, a waste assembled wrong inside a wall, can be reduced or declined outright. Consider the arithmetic honestly, the licensed connection you avoided might have cost a modest amount, while the slow leak it would have prevented can quietly write off cabinetry, flooring and walls before anyone notices, and if the insurer walks away, the whole number is yours. DIY plumbing does not just risk the repair, it risks the safety net underneath it.
Reason three, the complexity is hidden on purpose
Plumbing looks simple because the hard parts are buried. What the video does not show is the system behind the fitting, water pressure that batters an imperfect joint, the venting that lets drainage flow and traps hold their seals, falls measured in millimetres per metre, backflow rules protecting the drinking supply, and material compatibilities that decide whether a connection lasts decades or months. The classic DIY failures we attend, the trap that weeps into a cabinet for a year, the dishwasher hose without a high loop siphoning waste water backward, the flexi hose overtightened into a countdown, all share one feature, they worked on day one. Plumbing’s cruelty is the delay between the mistake and the invoice.
Reason four, the maths rarely works even when nothing goes wrong
Strip out risk entirely and the economics still disappoint. The licensed plumber arrives with the parts, the specialty tools, and the pattern recognition of thousands of identical jobs, and finishes in an hour what consumes a weekend, two hardware trips and a compromise. On drainage the gap widens further, because household tools relocate blockages while jetting and camera equipment actually resolve them, and the DIY hours spent losing to a root mass were never going to succeed at any level of effort. Your time has a value, and on most plumbing jobs, spending it elsewhere and buying the hour of expertise is simply the better trade.
What you absolutely should do yourself
None of this argues for helplessness, the opposite. The best household plumbing skills are the legal ones, know your mains shut off valve and test it yearly, change washers and cartridges, keep strainers in plugholes and fat out of sinks, run the monthly maintenance flush, glance at flexi hoses and the water meter, and act on early warnings while they are cheap. A household that does all of that will need us rarely, and when it does, will hand over a well kept system and a precise description of the problem, which is the DIY that actually saves money.
The partnership that works
The winning model is not DIY versus tradesperson, it is a division of labour, you on maintenance, observation and the legal small stuff, licensed professionals on everything touching supply, drainage and gas. That split keeps you legal, keeps your insurance intact, and keeps the hidden complexity with the people trained for it. When your side of the arrangement finds something, Drains Plus covers the other side across Perth, 24 hours, with fixed pricing and a free plumbing health check on every job. Call us for the parts the video glossed over.
If part of the DIY urge is simply wanting to understand your own home, that instinct deserves better than a spanner, and there is a version worth feeding. Ask questions while a licensed plumber works, request the camera footage of your drains, keep the compliance paperwork, and learn your system’s layout and history. An informed owner who knows what is behind the walls, and leaves it to licensed hands, gets all of the satisfaction with none of the exposure, and makes every future job faster and cheaper into the bargain.
