Can You DIY a Bathroom Renovation in Queensland?

• Electrical, plumbing, and waterproofing must be done by licensed trades in Queensland. This is not optional.
• DIY electrical work is illegal, with penalties up to $40,000 for an individual.
• Coordinating your own work over $11,000 makes you an owner-builder and needs a QBCC permit.
• Owner-builder work has no QBCC warranty insurance, and unlicensed work can void your home insurance.
• You can legally do the cosmetic parts: painting, non-structural demolition, and choosing fittings.
• The real DIY saving is modest, because the expensive work is the work you cannot legally do.

It is a fair question, and the honest answer is: partly. A bathroom renovation is not one job, it is a stack of trades, and in Queensland the law is clear about which of them a homeowner can touch and which they cannot. This guide sets out exactly what you are allowed to do yourself, what has to be licensed, what the owner-builder rules mean, and whether the money you save is worth the risk you take on.

Start here, because it is the part people get wrong, and it is the part with the highest stakes. Three trades are off-limits to a homeowner, and for good reason.

All electrical work in Queensland must be done by a licensed electrician. Full stop. Installing a power point, replacing a light fitting with an exhaust fan, or moving a switch all count as electrical work under the Electrical Safety Act, and doing it yourself is illegal. The Electrical Safety Office is blunt about it: DIY electrical work is unlicensed electrical work, with penalties of up to $40,000 for an individual, rising to $600,000 or five years imprisonment where the work exposes someone to a risk of death or serious injury. And if an electrical fault causes a fire, an insurer can refuse the claim if the work was illegal.

Bathroom plumbing is regulated work. Installing or moving fixtures, changing waste points, and altering drainage must be done by a licensed plumber, and in Brisbane and on the Gold Coast that work is notifiable and lodged with the council and QBCC (see Brisbane City Council). About the only plumbing task a homeowner can legally do is genuinely minor, unregulated work such as swapping a shower head. Anything connected to the water or waste system is a licensed job.

Waterproofing a wet area must comply with Australian Standard AS 3740, be done by a licensed waterproofer, and be certified (see the Housing Industry Association). It is the single most common and most expensive thing to get wrong, and DIY waterproofing is a leading cause of failure. Beyond the risk of a flooded home, uncertified waterproofing causes problems with approvals, insurance, and resale.

It is not nothing. There is a genuine DIY scope in a bathroom renovation, it just tends to be the cosmetic and preparatory work rather than the technical trades.

• Painting. Ceilings and any non-tiled walls are fair game once the room is ready.
• Non-structural demolition. Removing a vanity, an old shower screen, or fittings. Be careful, though: homes built before 1990 can contain asbestos, and if you disturb it you must stop and get it handled properly.
• Choosing and buying fittings. Tiles, tapware, the vanity, the mirror, accessories. This is where you shape the look, and it is entirely yours to do.
• Some finishing touches. Fitting a towel rail or a mirror to a wall, for example, as long as it is not electrical or plumbing.
• Coordinating the job. You can act as the owner-builder and manage the trades yourself, within the rules below.

What about tiling? You can physically lay tiles, and some homeowners tile a feature wall. But tiling in a wet area goes directly over the waterproofing, and getting the falls and the detailing right is exactly where DIY jobs fail. If you tile anything, do it away from the wet zone, and leave the shower and floor to someone who does it every day.

If you want to take on or coordinate the whole renovation yourself, you become an owner-builder, and there are rules. According to Master Builders Queensland:

• For domestic building work valued at $11,000 or more, you must obtain an owner-builder permit from QBCC. You have to be named on the title of the home.
• Any tradesperson you engage for work over $3,300 must be licensed.
• The owner-builder status stays on your home's title for six years.
• You are responsible for organising all building approvals, through your local council or a private certifier.
• You must complete a QBCC-recognised owner-builder course before the permit is issued.

The QBCC's owner-builder guidance sets out the full process. The key thing to understand is that being an owner-builder does not let you do the licensed trades yourself. You still have to use a licensed electrician, plumber, and waterproofer. What it lets you do is manage the project.

This is the part that turns a money-saving idea into an expensive one, and it is the reason we always raise it. Owner-builder work is not covered by QBCC home warranty insurance, so if something goes wrong, you carry it. Unlicensed work, whether electrical, plumbing, or waterproofing, can also void your home and contents insurance, so a leak or a fire traced back to DIY work may not be covered. And because the owner-builder status sits on your title for six years, you have to disclose it if you sell within that time, which can affect the sale. In short: the savings are visible up front, and the risks are the kind that only show up later, when they are expensive.

This is where the maths often disappoints. Labour makes up a large share of a renovation, so on paper DIY looks like a big saving. But the labour you can legally avoid is the cosmetic labour, painting and demolition, which is a small slice of the total. The expensive labour, plumbing, waterproofing, tiling, and electrical, is exactly the work you are not allowed to do. Add the cost of the owner-builder course and permit, the time you spend managing trades, and the risk of a costly mistake, and the realistic net saving from doing the DIY-able parts yourself is modest. For most people, the sensible saving is not doing the trades, it is making good choices and getting a fixed, itemised quote so the money goes where it should.

For most homeowners, the best answer is not fully DIY or fully hands-off. It is somewhere in between: do the parts you are allowed to and enjoy, painting, choosing the tiles and fittings, and keeping an eye on the project, and hand the licensed trades to the people who do them every day. You get some ownership and some saving, without taking on the parts that carry the real risk. If you want to go further and coordinate the whole thing, understand the owner-builder rules first, and go in with your eyes open about the insurance.

Simon Pintilie is a co-founder of xBathrooms, a QBCC licensed bathroom renovation company (licence 15482767) and Master Builders member working across Brisbane and the Gold Coast. Simon and the team have completed more than 50 bathroom renovations, designing, supplying, and installing each one under one roof.