Why Convert a Garage to a Granny Flat?
Converting Your Garage into a Granny Flat
These days, more and more homeowners are looking at their garages and thinking, "What else can I do with this space?" and choosing to convert the garage to a granny flat. It’s easy to see why!
With property prices on the rise and a growing need for functional living spaces, people are getting creative with how they use their existing homes. Turning an underutilised garage into a granny flat offers a practical solution that doesn’t require adding a whole new extension to the house. It’s a smart way to make better use of what you already have, especially if the garage is just gathering dust or clutter.
With the right planning and a few creative design choices, that dusty garage can become a vibrant and practical space, fitting seamlessly into the rest of your home and offering lasting benefits for your family.
Why Would I Want to Convert My Garage into a Granny Flat?
Here’s why making this change could be one of the best decisions you ever make.
Additional Income
Transforming your garage into a granny flat can provide a steady source of extra income. Renting it out, especially on platforms like Airbnb, can help cover mortgage payments or bills.
Accommodation for Family
A granny flat is perfect for housing the elderly, young adults, or extended family while maintaining privacy. Family members can enjoy their independence nearby and save on rent without feeling cramped.
Increase Property Value
When you convert garage into a granny flat, it can significantly boost your property’s overall value. A well-designed granny flat appeals to buyers, making your home more competitive in the market.
Maximising Space
How often does your garage sit unused? Converting it maximises that wasted space into a stylish, functional living area. This transformation leads to a more organised and pleasant home environment.
Flexible Living Arrangements
Granny flats offer versatile solutions for guests or family members needing temporary or long-term accommodation. Whether hosting friends for a weekend or providing space for a relative, a granny flat adapts to your changing circumstances without sacrificing your living space.
Basic Requirements to Convert Garage into Granny Flat
Before diving into this exciting project, it’s crucial to understand that each council, including those in Perth WA, has its own set of regulations for converting a garage into a granny flat.
Here are some minimum requirements you’ll need to consider:
- Your property must be 450sqm or bigger.
- There must be no other granny flat on your block.
- Your property must be in a residential zone.
- Any fascia or eaves must be fire-rated.
- The garage must be less than 60sqm and meet the following conditions:
- Located more than 3m away from trees and the rear property line.
- Positioned at least 0.9m away from side boundaries.
If the garage does not meet boundary distance requirements, fire-rated walls may be required for council approval. Understanding these regulations will set you on the right path to a successful transformation!
Factors That Affect the Cost When You Convert Garage to Granny Flat
So, what about the costs? These are some of the key “convert garage to granny flat” factors that will influence your budget when converting your garage:
Heating and Cooling
Adding HVAC systems or insulation is essential for comfort. However, these can add up to the overall cost.
Design
Custom design elements or open floor plans may affect the total expense. It’s great to have your dream layout, but be mindful of your budget.
Plumbing and Sewerage
Installing plumbing lines and sewerage can significantly impact the total cost of your convert garage to granny flat project.
Electrical Work
Upgrading electrical systems to meet residential standards will also influence costs.
Cabinets for Storage
The inclusion of custom cabinetry or built-in storage will also add to the final budget.
Dry Wall
Installing drywall is a necessary expense, helping to create those cosy interiors.
Paint
The cost of painting both interior and exterior spaces adds to overall expenses.
Fixtures and Appliances
Installing modern fixtures and essential appliances, such as stoves or fridges can also increase your garage conversion expenses. Think about what you’ll need for everyday living.
Landscaping
Landscaping for the area around your granny flat can enhance the overall look and function of your property. However, it can also affect the overall cost of your project.
Are the Rules the Same Whether It Is a Detached or Attached Garage?
No! Building rules and requirements differ depending on whether you're converting an attached or a detached garage. While both options have their perks, there are key differences to keep in mind when planning your granny flat conversion in WA.
Attached Garage
- When converting an attached garage, it’s essential to create a separate entrance for the granny flat. This type must have a separate entrance, meaning no interior access to the main home.
- Depending on your design, it can be easier to link utilities like plumbing and electricity to the existing house, but you’ll need to meet specific fire and safety regulations.
Detached Garage
- Offers more privacy and flexibility but may require more extensive plumbing and electrical work.
- Since it’s physically separated from the main house, additional work might be required for plumbing and electrical connections. You’ll likely need to dig trenches to run new lines.
Does Council Need to Be Involved for a Legal Conversion?
When it comes to council involvement, each council has its own rules regarding granny flat conversions. As long as your property meets the necessary requirements, you may not need council approval.
If your convert garage to granny flat project meets all required regulations, you can apply for a Complying Development Certificate (CDC), meaning no council approval is necessary. This can make the process a lot smoother and quicker!
But always double-check with your local council to ensure you’re following the right path. It’s better to be safe than sorry!

Build Your Granny Flat with Prestige Renovations
Turning your garage into a granny flat isn’t just practical—it’s a great way to make your home work harder for you. Whether it’s for family, guests, or extra income, you’re creating a valuable space that adds real benefit to your property.
At Prestige Renovations, we’re a reliable partner when it comes to converting a garage into granny flat projects and custom home builds. Our team will be with you from start to finish, turning your garage into the stylish, functional space you’ve been dreaming of— exactly just the way you imagined.
Ready to get started? Reach out for personalised consultation and top-notch service.