Everybody plans a bathroom renovation from the tiles up. Vanity, tapware, the colour of the grout, whether the niche goes in the shower wall. Nobody plans it from the roof down, and that is how you end up with a brand new ceiling that has a brown stain on it eight months later.
I work around roofs and home energy upgrades in Sydney, Australia, and I see the same five things skipped over and over. None of them are glamorous. All of them are cheaper to fix before the new tiles go in than after.
1. Find Out Why the Ceiling Has a Stain
A faint yellow ring on the bathroom ceiling is the single most ignored warning sign in a house. Most people paint over it during the renovation and move on. The stain is the end of a journey that started somewhere above it, usually a cracked tile, a lifted flashing or a rusted valley on the roof, and the water has travelled along the timbers before it showed up inside. Painting the stain does nothing to the source.
Get it looked at properly. A roofer who does roof leak repairs in Sydney will trace the stain back to the actual entry point and photograph it, and it is usually a few hundred dollars to fix. Compare that with re-plastering a new ceiling.
2. Check the Exhaust Fan Actually Goes Somewhere
Pull the cover off the ceiling exhaust fan and look. In an alarming number of older houses the duct just ends in the roof cavity, which means every shower has been pumping warm wet air onto the underside of the roof for years. That is where the mould on the rafters and the swollen plaster come from. While the ceiling is open for the renovation, run the duct to a proper roof or eave vent. It is an hour of work with the ceiling exposed and a nightmare afterwards.
3. Replace the Hot Water System Before the Walls Close Up
This is the one people regret most. The hot water unit is usually 10 to 15 years old by the time a bathroom gets renovated, and the new rain shower head pulls more water than the old one ever did. Six months after the renovation the tank dies and the plumber has to cut into a finished wall to get to the pipework.
Do it in the same job. If you are in New South Wales there is a government incentive that takes a large part of the cost off a heat pump hot water system when it replaces an old electric tank, and it comes off the installed price on the day rather than being claimed afterwards. You can see what applies to your postcode through the NSW hot water rebate guide, which is an independent service rather than a government site. Other Australian states have their own versions, and plenty of countries run similar programs, so wherever you are it is worth a search before you buy a like-for-like tank.
4. Look at the Waterproofing, Not Just the Tiles
The membrane under the tiles is what keeps the shower water out of the floor and the room next door. It is the cheapest material in the bathroom and the most expensive thing to get wrong. Ask the tiler or builder to show you the membrane cured and tested before the first tile goes down, and take a photo of it. If a leak shows up in two years, that photo is the difference between a warranty claim and an argument.
5. Fix the Gutter Above the Bathroom
Bathrooms sit on external walls more often than not, and the gutter directly above is where overflow runs down the wall in a storm. Blocked or sagging gutters put water behind the brickwork and into the exact wall you are about to tile. Clean them, check the fall, and replace the section if it is rusted. Ten minutes on a ladder.
The Order to Do It In
- Roof and gutter check first, with photos of anything found.
- Hot water system replaced or booked.
- Exhaust fan ducted to the outside.
- Waterproofing done and photographed.
- Then the pretty part.
A bathroom renovation is one of the few times the ceiling, the wall cavities and the plumbing are all open at once. Use it. Everything on this list costs a fraction of the tiles and is the reason the tiles still look good in ten years.
©2026 The Dedicated House. All rights reserved. No part of this blog post may be used or reproduced without the written consent of the copyright owner.
Click the links below for any posts you have missed:
Bathroom Design Trends to Elevate Your Home
Which Michigan Plumbing Problems Need Immediate Attention?
How to Transition Your Front Porch From Halloween to Thanksgiving
The Ultimate Guide to a Clutter-Free Home
The Future of Turnkey Property Staging and Fast Logistics
A Season-Based Guide to Yacht Maintenance Planning
I’d love for you to join my email list! You’ll receive a notification straight to your inbox which will include links to my latest home project posts! Simply enter your address below.
Thanks for stopping by! Have a wonderful day/night depending on where you are in the world! Go with God and remember to be kind to one another!
Toodles,
Leave a Reply