Plumbing Mistakes to Avoid During a Bathroom Renovation

Luke Williams

Oct 7

5 min read

Renovating a bathroom can completely transform your home, but it is also one of those projects where a few poor decisions early on can lead to expensive problems later.

From moving fixtures without considering the plumbing to choosing products that are not suitable for the existing setup, there is a lot more happening behind the walls and under the floor than most homeowners realise.

If you are planning a bathroom renovation in Adelaide’s southern suburbs, involving a licensed plumber early can help you avoid unnecessary costs, delays and changes once work is already underway.

Here are some of the most common plumbing mistakes to avoid during a bathroom renovation.

1. Waiting Too Long to Involve a Plumber

One of the biggest mistakes homeowners can make is planning the entire bathroom layout before speaking with a plumber.

You may have already chosen where you want the shower, vanity, bath and toilet to go, only to discover that moving the existing plumbing is more complicated or expensive than expected.

Getting your plumber involved early means they can assess the existing pipework, drainage and water supply before the design is finalised.

This can help you work out what is practical, what may add significantly to the renovation cost and whether there are more efficient ways to achieve the result you want.

2. Moving Fixtures Without Understanding the Cost

Changing the location of a vanity may be relatively straightforward in some bathrooms, while relocating a toilet or shower can involve much more work.

Moving fixtures can require changes to:

water supply pipes
waste pipes
drainage
floor penetrations
wall framing
waterproofing
concrete slabs or flooring

This does not mean you should never change your bathroom layout. Sometimes moving fixtures makes a huge difference to the functionality of the room.

The important thing is to understand the plumbing implications before committing to the new design.

A plumber can help you compare different layout options and explain where additional plumbing work may be required.

3. Choosing Fixtures Before Checking Compatibility

It is easy to fall in love with a particular tap, shower, toilet or vanity without checking whether it will work with your existing plumbing.

Different products can have different installation requirements, connection points and water-pressure requirements.

Before ordering expensive fixtures, it is worth checking with your plumber to make sure they are suitable for the space and plumbing configuration.

Doing this early can help prevent delays, product exchanges or costly modifications during installation.

4. Ignoring Existing Plumbing Problems

A renovation is the perfect opportunity to deal with plumbing issues that may otherwise remain hidden.

Once walls, flooring and fixtures are removed, your plumber may identify ageing pipework, corrosion, leaks, poor drainage or previous plumbing work that should be addressed before the new bathroom goes in.

It can be tempting to focus entirely on what the finished bathroom will look like, but fixing underlying issues during the renovation may save you from having to disturb your new tiles, cabinetry or fittings later.

5. Forgetting About Drainage

Good drainage is essential in any bathroom.

Showers, basins, baths and toilets all need to drain correctly, and the location and condition of the existing waste pipes can affect how easily your new bathroom layout can be achieved.

Drainage problems can cause:

slow-draining showers or basins
unpleasant smells
recurring blockages
water backing up
leaks and water damage

Your plumber can assess the drainage as part of the renovation planning process and identify anything that should be repaired or upgraded.

6. Not Considering Water Pressure

That large rain shower may look fantastic, but it will only perform properly if your plumbing system can supply it with adequate water pressure and flow.

If you are upgrading showers, installing additional outlets or changing tapware, it is worth discussing water pressure with your plumber.

They can advise whether the products you are considering are suitable for your home and whether any plumbing changes may be required.

7. Trying to DIY Licensed Plumbing Work

There are plenty of parts of a renovation that homeowners may choose to tackle themselves, but plumbing work needs to be carried out correctly and in accordance with Australian requirements.

Poorly installed plumbing can result in leaks, water damage, drainage problems and expensive repairs.

Using a licensed plumber also helps ensure the work is completed properly and that you have the appropriate documentation for work that requires it.

8. Poor Coordination Between Trades

Bathroom renovations usually involve several different trades, including plumbers, electricians, tilers, waterproofers, cabinetmakers and sometimes builders.

The order in which these trades work matters.

For example, plumbing may need to be positioned before walls are closed, cabinetry installed or waterproofing completed.

Bringing your plumber into the project early makes it easier to coordinate the plumbing requirements with the rest of the renovation and reduces the chance of something needing to be removed or redone later.

If you’re planning a renovation, our plumbing services can help from the initial layout and rough-in through to final fixture installation.

9. Forgetting About Future Maintenance

A beautifully finished bathroom is great, but it also needs to remain practical to maintain.

Where possible, plumbing should be installed with future servicing and repairs in mind.

Your plumber can help consider things such as isolation points, access to connections and the position of fixtures so that routine maintenance does not become unnecessarily difficult later.

10. Focusing Only on the Finish

Tiles, tapware, mirrors and cabinetry naturally get a lot of attention during a bathroom renovation, but what is happening behind the finished surfaces is just as important.

Quality plumbing provides the foundation for a bathroom that works properly for years to come.

Taking the time to plan the plumbing correctly can help protect the investment you are making in the renovation.

Planning a Bathroom Renovation?

The earlier you involve your plumber, the easier it is to make informed decisions about your layout, fixtures and plumbing requirements.

Whether you are giving an existing bathroom a simple update or completely changing the layout, Onboard Plumbing & Gas can assist with the plumbing side of your renovation from the initial planning stages through to installation.

Getting the plumbing sorted early can help reduce unexpected costs, avoid delays and make the overall renovation process much smoother.

If you are planning a bathroom renovation in Seaford or anywhere across Adelaide’s southern suburbs, get in touch with Luke on 0403 513 795 or visit www.onboardplumbingandgas.com.au to discuss your project.