Planning a bathroom renovation without the blowout

What a bathroom renovation actually involves

A full renovation runs through a fixed sequence: strip-out, any plumbing and electrical rough-in, waterproofing, tiling, then fit-off — vanity, toilet, tapware, shower screen, mirrors and accessories. Each stage depends on the one before it, and the waterproofing stage in particular can't be rushed because membranes need curing time before tiles go on.

Some renovators run the whole job with their own team; others coordinate separate trades. Either can work, but one person needs to own the schedule, because a bathroom with the tiler booked before the waterproofer has finished is a bathroom that stalls for a fortnight.

A cosmetic refresh is a different, smaller job: same layout, new vanity, toilet, tapware and tiles. If your existing waterproofing is sound and nothing moves, you're replacing the room's jewellery rather than rebuilding it — and the price reflects that.

Where the money goes

Budget refreshes that keep the existing layout sit toward the lower end of the range — often less than half the cost of a full renovation. A standard full strip-out and rebuild lands in the low-to-mid twenties of thousands for most homes, while premium ensuites with relocated plumbing, freestanding baths and floor-to-ceiling tiles push well beyond that. These are indicative bands only; your fittings and your home decide the real number.

The single biggest cost lever is whether plumbing moves. Keeping the toilet, shower and vanity where they are avoids extra plumber time and extra waterproofing. The second lever is tiling: tile prices span a wide range per square metre, and tiling floor to ceiling roughly doubles the tiled area.

Choosing the right renovator

The plumbing and electrical work inside your renovation must be done by licensed tradespeople — that's non-negotiable Australia-wide. Waterproofing is licensed as its own trade in several states, and wherever you live, you should ask who is doing it and insist on a certificate for it. Waterproofing failure is the most expensive mistake a bathroom can make, and it's invisible until it isn't.

Beyond licences, look for a renovator who talks you through the sequence unprompted, shows photos of recent bathrooms (not just glamour shots — ask to see a niche detail or a floor waste), and quotes with a clear list of inclusions. A good bathroom quote names the fixtures or carries allowances you can sanity-check against what you actually plan to buy.

Mistakes to avoid

Most bathroom regrets come from decisions made too quickly or savings made in the wrong places. The room is too expensive to redo, so slow down at the points below.

• Moving plumbing for a marginal layout gain — it's one of the biggest single cost jumps you can make
• Skipping the waterproofing certificate, or not asking who's doing the waterproofing at all
• Choosing tiles by photo alone — see a full tile in daylight before committing
• Leaving no contingency; 10 to 15 per cent covers the surprises old walls hide
• Booking trades yourself around a renovator's schedule without one person owning the sequence
• Paying a large deposit before demolition has even started