When considering adding a bathroom to your Australian home, it’s essential to weigh the costs and benefits, as well as potential challenges. Renovating your space to add a new bathroom can significantly increase the value and functionality of your home, but determining the specifics, such as the size, location, and budget, can be daunting.
As you plan your bathroom addition, pay attention to important aspects such as ventilation, plumbing, and lighting. Ensuring proper ventilation can help to prevent mould growth, so opt for an external wall with a window when possible or consider installing an extraction fan or dehumidifier. Additionally, think about the location of your existing plumbing system, as this will affect the overall access, cost, and timeline of your project. By thoroughly considering these elements, you’ll be well on your way to a successful bathroom addition.
Understanding the Basics of Adding a New Bathroom
Adding a Bathroom to an Existing House
Adding a bathroom to your house is a valuable investment, offering both convenience and increasing your home’s value. Budgeting for this type of project is essential, as prices for a new bathroom addition could start around $20,000 and increase depending on the size and materials.
Consider the available space in your house before starting the project. There is usually sufficient space for an extra bathroom, even if it may be smaller than your existing one. You can convert an existing walk-in closet or take a few feet from a larger room to create a new bathroom.
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Proper ventilation is essential in any bathroom, especially if you are unable to install a window. An extraction fan or dehumidifier can help prevent bathroom mould, ensuring your new bathroom remains comfortable and safe.
If you’re converting a dry area, make sure to hire a licensed waterproofer to install a waterproofing system behind your new tiles.
Adding an Ensuite to the Side of the House
An ensuite bathroom is an excellent addition to your bedroom, adding value and convenience to your home. When planning your ensuite design, consider the following:
- Size: Ensuite bathrooms can be smaller than a standard bathroom, often merely requiring a toilet, hand basin, and shower. Keep in mind the available space in your house when planning.
- Accessibility: Ensure the ensuite has easy access from your bedroom, without impacting the layout of other rooms in the house.
- Costs: A typical ensuite could cost between $24,000 and $34,000, depending on materials and labour choices. If you decide to undertake most of the work yourself, the costs may drop substantially, but be prepared for the effort involved.
- Storage: Incorporate storage solutions like built-in vanity cabinets and shelving units into the walls to maximise space without making the room feel cramped.
Remember that adding an ensuite to your home may require permission from your local council, so ensure you have the necessary permits before beginning your project.
It’s a good idea to hire licensed professionals, such as a plumber, tiler, and waterproofer, for the job. They not only provide quality services but also have insurance that protects your new bathroom project. Make sure to get copies of the compliance certificate and warranty certificate when the project is finished.
Bathroom Addition Costs and Budgeting
Cost of Adding a Bathroom in Australia
When considering adding a bathroom to your Australian home, it’s essential to be aware of the costs involved. The average bathroom renovation cost in Australia is around $17,522. However, the cost to add a bathroom can vary widely depending on the size, materials, and complexity of the project.
For a second bathroom that is 11 x 3 metres, the cost ranges between $24,000 and $34,000. In contrast, an 18 x 4-metre bathroom can cost between $42,000 and $56,000. If you plan to do most of the work yourself, expect to spend about $5,100 for the smaller bathroom and $8,200 for the larger one.
Factors Affecting the Cost
Several factors can influence the cost of adding a bathroom to your home:
- Size: The cost to add an ensuite or a second toilet varies depending on the size of the space. Smaller projects, such as adding a second toilet, will generally cost less than larger renovations.
- Materials: The materials you choose for your bathroom will significantly impact the overall cost. High-quality fittings and fixtures tend to cost more, but they may last longer and add value to your home.
- Labour: The cost of labour can range from $1,100 per square metre for a new home to $1,600 per square metre for a renovation. Labour includes tasks such as waterproofing, plumbing, tiling, electrical work, gyprocking, and painting.
- Location: Costs can vary based on your location in Australia. For instance, you may find differences in pricing for materials and labour between major cities like Adelaide and more regional areas.
- Complexity: The complexity of your bathroom addition, such as adding a bathroom on a concrete slab, may increase the overall cost. Some projects may require additional structural work or plumbing alterations, which will raise the price.
When planning and budgeting for your bathroom addition, it’s crucial to consider all of these factors. Remember to obtain quotes from multiple professionals and compare materials and fixtures to get the best value for your investment. And don’t forget to account for unexpected expenses, as any construction project may encounter surprises.
Necessary Permits and Regulations
Not all bathroom renovations need council approval in Australia, but it’s essential to research and understand your local council’s specific requirements. Generally, significant extensions, excavation, or new freestanding buildings tend to need council approval. Obtain a planning permit from your local council before commencement, if required. It’s essential to work closely with your contractor, architect, or engineer to ensure your bathroom addition complies with any necessary permits and regulations.
Here are some steps you can follow:
- Research local council requirements: Each council may have different regulations for adding a bathroom, so it’s essential to be informed about your local council’s specific requirements.
- Consult a professional: Engage with a qualified contractor, architect, or engineer to provide guidance on regulations and permits.
- Submit necessary paperwork: Complete and submit any required applications or documents to obtain necessary permits and approvals.
Understanding and adhering to your local council’s requirements is a crucial aspect of adding a bathroom to your home. It ensures that the final result is safe, compliant, and adds value to your property.
Adding and Installing Bathroom Fixtures
When adding a bathroom in Australia, it’s essential to consider the installation of various fixtures that will make your new space functional and comfortable. In this section, we’ll discuss how to install a bathroom exhaust fan, hand basin, heater, toilet, door, and window.
Installing a Bathroom Exhaust Fan
A proper ventilation system is critical to preventing mould and dampness in your bathroom. To install an exhaust fan, first, choose an appropriate location on the bathroom ceiling or wall. Ensure it’s close to the shower or bath, where the steam is generated. You may need to hire an electrician to connect the fan to your power supply, as well as a professional to cut holes in your walls or ceilings, if necessary.
Installing a Bathroom Hand Basin
Select a suitable hand basin that fits your bathroom design and dimensions. A plumber can help with the installation process, which involves connecting the sink to your home’s water supply and waste pipes. Ensure there’s adequate support to hold the weight of the sink, especially if you’ve chosen a wall-mounted option.
Installing a Bathroom Heater
For added comfort during colder months, a bathroom heater is a valuable addition. Your options include wall-mounted heated towel rail, ceiling-mounted fan or lamp heaters or radiant heaters that come in various forms and shapes, with varying wattages depending on the size of your space. Consider hiring a professional to ensure the heater is safely installed and complies with Australian safety regulations.
Adding a Toilet to Existing Plumbing
When adding a toilet to your bathroom, consult with a plumber to determine the best location based on your existing plumbing system. Access to sewer pipes is crucial, so keep this in mind when planning the layout. Don’t forget to check the National Construction Code of Australia for the minimum spacing requirements between fixtures.
Installing a Bathroom Door
Adding a bathroom door requires careful planning and measurement. Consider door styles and materials that provide privacy while optimising space. Once you’ve selected the appropriate door, hire a professional to install the door frame, and align the hinges and lock mechanism.
Installing a Bathroom Window
Bathroom windows provide natural light and ventilation, making them an essential aspect of your new space. Choose a style that suits your needs, such as frosted glass for privacy. Ensure the window is properly sealed and weatherproofed to prevent water damage.
Follow these guidelines, and you’ll be on track to add a functional and stylish bathroom to your Australian home.
Specialised Bathroom Additions
When considering adding an extra bathroom or enhancing your existing one in Australia, there are several unique options you can explore. In this section, we’ll discuss three specialised bathroom additions: adding a powder room, adding an outdoor bathroom to a shed, and adding an extra toilet to your laundry room.
Adding a Powder Room
A powder room is a small, half-bath that typically includes just a toilet and hand basin. Adding a powder room to your home can increase its functionality and value. To get started with your powder room addition, you’ll first need to choose the best location. Common choices include under the stairs, in a hallway or in a small corner space.
When adding a powder room, you should consider the costs involved. Expenses in Australia can range from $24,000 to $34,000, depending on the size and materials used. However, if you decide to tackle the project yourself, costs can be significantly reduced to approximately $5,100.
Adding an Outdoor Bathroom to a Shed
Another specialised bathroom addition is incorporating an outdoor bathroom into a shed or other outdoor structure. This type of project requires careful planning, including considerations like plumbing, electrical installation, and ventilation.
To add a toilet to a shed, you can explore using a traditional plumbing system, or opt for a more environmentally friendly option like a composting toilet. Additionally, you’ll need to ensure there’s a proper drainage system for the shower and sink in the outdoor bathroom. Costs for this type of project can vary widely depending on the complexity of the installation.
Adding an Extra Toilet to Laundry Room
Finally, an increasingly popular specialised bathroom addition in Australia is adding an extra toilet to your laundry room. This addition maximises space and boosts functionality in your home, especially if it lacks sufficient bathroom facilities.
To add a toilet to your laundry room, you’ll need to consider factors such as plumbing, ventilation, and the layout of the space. You might need to rearrange your laundry appliances, add a partition wall or do some minor construction to accommodate the new toilet. Costs for this project will depend on your specific situation, but be prepared to budget for materials and professional labour if needed.
What’s Next
Adding a bathroom to your Australian home can greatly enhance its functionality, comfort, and value. By carefully considering factors such as design, location, plumbing, and building regulations, you can create a beautiful and practical new space that meets your needs and preferences.
We hope this essential guide has provided you with valuable insights and tips to help you navigate the process of adding a bathroom to your home. If you have any further questions or need expert advice on your bathroom addition project, don’t hesitate to contact SQM Architects. Our team of experienced professionals is here to assist you in creating the perfect bathroom that complements your home and lifestyle.
How to gain professional insights for FREE, no strings attached
Unsure about your next building project? Get expert advice, no strings attached! Take advantage of our FREE consultation at SQM Architects. We’re here to answer your queries and bring clarity to your vision. With our transparent process and reputable track record, your project is in capable hands.

About the Author
Sammi Lian, the founder of SQM Architects, has dedicated over 15 years of her career to the architectural industry. She works diligently with property developers, builders, investors, and homeowners, using her skills and knowledge to facilitate their building design needs.