There's something satisfying about fixing a problem yourself. And for some minor plumbing jobs around the house, a little DIY is perfectly fine. But for others, attempting to fix it yourself can turn a small problem into a much bigger — and more expensive — one.
As a Craigieburn plumber who gets called in to fix botched DIY attempts on a regular basis — from Epping to Doncaster, Eltham to Essendon — I've put together this guide to help Melbourne homeowners know exactly when to grab a spanner and when to pick up the phone.
Plumbing Jobs You Can Safely DIY
Let's start with the good news. There are a handful of simple plumbing tasks that most homeowners can handle without a licensed plumber — as long as they're comfortable with basic tools and don't involve the main water supply or drainage system.
Replacing a Tap Washer
A dripping tap is one of the most common household plumbing issues. In most cases, the culprit is a worn tap washer — a small rubber seal that costs under $2 at any hardware store. Replacing it requires turning off the water at the isolator valve under the sink, removing the tap handle, swapping the washer, and reassembling. It's a straightforward job for most homeowners — just make sure you know where your water shutoff is before you start.
Unblocking a Slow Sink Drain
If a bathroom or kitchen sink is draining slowly, a basic blockage near the surface is usually to blame — hair, soap scum, or food residue caught in the drain trap. A drain strainer, a hand-held plunger, or a small drain snake from the hardware store can often clear these without the need for a plumber. Avoid using harsh liquid chemical drain cleaners — they can corrode pipe joints over time, particularly in older Melbourne homes.
Replacing a Toilet Cistern Mechanism
If your toilet keeps running after flushing or takes a long time to refill, the internal cistern mechanism may need replacing. Replacement kits are available at hardware stores and the job involves turning off the water supply, draining the cistern, and swapping the valve assembly. It's manageable for a confident DIYer — just follow the kit instructions carefully.
Replacing a Showerhead
Swapping a showerhead is one of the easiest plumbing jobs there is. Turn off the water, unscrew the old head, wrap the thread with plumber's tape, and attach the new one. No tools beyond a shifting spanner required.
💡 The Golden DIY Rule
If the job involves cutting into walls, connecting to main drainage lines, working on gas fittings, or requires a permit under Victorian plumbing regulations — it's not DIY territory. Always check before you start.
When You Should Always Call a Licensed Plumber
The following jobs are not DIY territory — full stop. Attempting these without a licence can void your home insurance, damage your property, create a safety risk, and in some cases is illegal under Victorian law.
Burst or Leaking Pipes
A burst pipe can release hundreds of litres of water in minutes, causing serious structural damage to walls, floors, and foundations. If you have a burst pipe, turn off your main water supply immediately and call a plumber as an emergency. Do not attempt to repair the pipe yourself with tape or sealant — these are temporary measures at best and can make the repair harder and more expensive.
Blocked Drains That Keep Coming Back
If a drain keeps blocking despite being cleared, there's an underlying cause — tree root infiltration, a cracked pipe, offset joints, or a collapsed section of the drainage system. This is a common issue across Melbourne's established suburbs like Heidelberg, Ivanhoe, Doncaster, and Thomastown, where older pipe systems are more susceptible to root intrusion. A plunger won't fix any of these. A licensed plumber with a CCTV drain camera will identify exactly what's happening inside your pipes and fix the root cause, not just the symptom.
Any Gas Fitting Work
Gas plumbing is strictly regulated in Victoria and must be carried out by a licensed gas fitter. This includes connecting gas appliances, replacing gas pipes, and any work on your hot water system's gas supply. If you smell gas in your home, leave the property immediately, do not use any electrical switches, and call your gas supplier's emergency line.
Hot Water System Installation or Replacement
Installing or replacing a hot water system — whether gas, electric, heat pump, or solar — requires a licensed plumber. Incorrect installation can create gas leaks, electrical hazards, or carbon monoxide risks. It also voids most manufacturer warranties. This is not a job for YouTube tutorials.
Sewage Backups
If sewage is backing up into your home through floor drains, showers, or toilets — call a plumber immediately. A sewage backup is both a health hazard and a sign of a serious blockage in your main sewer line. It will not resolve itself and every hour you wait makes the damage worse.
Any Leak You Can't See
Hidden water leaks — inside walls, under floors, or beneath a concrete slab — require professional leak detection equipment to locate. If you have unexplained wet patches, rising water bills, or the sound of running water when everything is turned off, call a plumber rather than starting to open walls. This is particularly common in homes across Eltham, Bundoora, and Pascoe Vale where older pipe systems can develop concealed leaks over time.
⚠️ Check Your Home Insurance
Many home insurance policies require plumbing repairs to be carried out by a licensed tradesperson. DIY plumbing that causes water damage may not be covered if the work wasn't done by a professional. Check your policy before picking up the tools.
The Grey Area — Jobs That Depend on Your Confidence Level
Some plumbing tasks sit in the middle — doable for an experienced DIYer, but risky for someone less familiar with plumbing systems. These include:
The honest rule: if you're not confident about any step of the process, or if a mistake would cause water damage or a safety hazard, call a plumber. The cost of a plumber is almost always less than the cost of fixing water damage.
When In Doubt, Call Us First
Not sure whether your plumbing issue needs a professional? Give Momentum Plumbing a call on 0400 362 044. We're happy to answer a quick question over the phone and let you know whether it's something you can handle yourself or whether we need to come out.
We're based in Craigieburn and service suburbs across northern and greater Melbourne — including Epping, Mickleham, Lalor, Thomastown, Bundoora, Doncaster, Heidelberg, Eltham, Ivanhoe, Pascoe Vale, Glenroy, Hadfield, and Essendon. Same-day and next-day appointments are available for most jobs, and we offer 24/7 emergency response when you need it most.
