How Much Does a Bathroom Renovation Cost?

"How much does a bathroom renovation cost?" is the first question almost every homeowner asks — and the honest answer is: it depends on the bathroom you have and the bathroom you want. This guide breaks down what actually drives the cost of a bathroom renovation in South East Queensland, so you can budget realistically before anyone lifts a tile.

The short answer: typical bathroom renovation cost ranges

Across Australia, industry surveys generally put bathroom renovations in these broad brackets:

• Budget refresh — new tapware, vanity, toilet and a repaint, keeping the existing layout: often in the low five figures.
• Mid-range renovation — full strip-out, new waterproofing, tiling, fixtures and fittings, same footprint: commonly somewhere in the middle five figures.
• High-end or structural renovation — moving walls, relocating plumbing, premium finishes, underfloor heating: can climb well beyond that.

Treat any figure you read online (including these) as a starting point only. Two bathrooms of the same size can land tens of thousands of dollars apart once layout changes, water damage and finish choices come into play. The only number that matters is a written quote for your bathroom.

What actually drives the cost

1. Whether the layout changes

Keeping the toilet, shower and vanity where they are is the single biggest money-saver. Once drainage and water points move, you're paying for new in-wall and under-floor plumbing, possible slab cutting, and extra waterproofing — and in Queensland all of that must be done by a licensed plumber.

2. Waterproofing and what's hiding under the old tiles

Waterproofing is a legal requirement, not a line item to trim. It's also where older bathrooms hide surprises: soft floors, leaking shower trays and water-damaged framing usually only reveal themselves at strip-out. A sensible renovation budget keeps a contingency of around 10–15% for exactly this.

3. Fixtures and finishes

A tap can cost less than a takeaway dinner or more than a weekend away. Tiles, vanities, screens and tapware are where identical layouts end up with wildly different totals — and where you have the most control over the final price.

4. Compliance and certification

In Queensland, plumbing and drainage work must be carried out by a QBCC-licensed plumber, and gas work (like moving a gas hot water unit) must be certified. It's not the place to cut corners: uncertified work can void insurance and cause real problems when you sell.

Where the money goes on a typical renovation

As a rough rule of thumb, expect the spend to split between trades and labour (plumbing, waterproofing, tiling, electrical), materials and fixtures, and then the strip-out, rubbish removal and small building works that tie it together. Plumbing is usually one of the larger trade components because it's involved at both ends — rough-in early, fit-off last.

How to keep your bathroom renovation on budget

• Keep the layout if the current one works — it's the biggest single saving.
• Get the plumbing inspected first. Knowing the state of your drainage and water lines before you commit avoids mid-project surprises.
• Choose fixtures early and have them on site before work starts, so trades aren't waiting on deliveries.
• Get itemised quotes so you can see labour, materials and PC (prime cost) items separately.
• Hold a contingency of 10–15% for what's behind the walls.

Talk to the plumbers first

C's Plumbing & Gas is a family-run, QBCC-licensed team based in Yatala, handling bathroom renovation plumbing across the Gold Coast, Logan and Brisbane's southside — from strip-out and rough-in through to fit-off and certification. We quote upfront, so you'll know the plumbing side of your renovation budget before work begins.

Planning a bathroom renovation? Call us on 0405 275 741 for an upfront quote on the plumbing — or read more about our bathroom renovation plumbing on the Gold Coast, in Brisbane or in Logan.