A bathroom renovation is one of the most common home improvements on the Gold Coast, and it's also one of the most plumbing-intensive. Behind every new shower, bath, basin and toilet is a network of water supply, waste and waterproofing that must be installed correctly — and in most cases, that work must be carried out by a licensed plumber.
Before the renovation: planning and rough-in
The plumbing layout determines what's possible. Moving a toilet, repositioning a shower, or adding a second basin all depend on where the existing waste and water pipes run, and whether the floor structure allows changes. A plumber can assess feasibility before you commit to a design, and handle the "rough-in" — the concealed pipework installed before the wall and floor linings go on.
Getting the rough-in right is critical, because mistakes here are expensive to fix once the tiles are on. If you're planning a renovation, involve a plumber at the design stage rather than after the builder has started.
During the renovation: waterproofing and compliance
Waterproofing in wet areas is regulated for good reason — failed waterproofing is one of the most common and costly causes of bathroom water damage. In most cases, waterproofing in wet areas must be carried out by a licensed plumber or certified waterproofer and must meet Australian Standard AS3740.
A licensed plumber ensures the waterproofing, falls to drains, and pipe installations all comply, so your renovation passes inspection and doesn't leak into the structure over time.
After the renovation: fixtures and commissioning
Installing the final fixtures — tapware, shower heads, the toilet suite, the bath — requires connecting to the roughed-in pipework and testing for leaks. Pressure testing the water supply and checking the waste connections before the room is handed over catches any issues while access is still straightforward.
Common bathroom renovation plumbing mistakes
- Moving fixtures without checking waste pipe falls — toilets and showers need a minimum fall to the waste, and moving them too far can make the fall impossible.
- Inadequate waterproofing — skipping or under-specifying waterproofing leads to leaks into adjoining rooms and ceilings.
- Undersized hot water supply — adding a second shower or a larger bath can outstrip an older hot water system. See our hot water sizing guide
- Poor mixer placement — wall-mounted mixers need precise positioning before the tiles go on.
Why use a licensed Gold Coast plumber?
Bathroom plumbing work must be carried out (or supervised) by a licensed plumber, and the work must comply with Australian plumbing standards. Using a licensed plumber protects your warranty, ensures the work passes inspection, and prevents the water damage that DIY or unlicensed work so often causes.
If you're planning a bathroom renovation on the Gold Coast, contact our team to discuss the plumbing requirements before you start.
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