Can I Build a Granny Flat on My Property in Perth? Facts (and Myths) Explained

Building a granny flat on your property might seem like a dream come true, but navigating the rules and regulations can feel like wandering through a maze. 

With the demand for affordable housing options and multi-generational living on the rise, granny flats have become a popular solution for many homeowners.

Not only do they provide additional living space, but they also have the potential to add significant value to your property.

However, before you jump into the exciting process of designing and building, it’s crucial to understand the local guidelines and requirements.

Perth, like many cities, has specific zoning laws and building codes that dictate whether you can build a granny flat on your property. Understanding these rules will save you time, money, and a lot of headaches down the road.

In this article, we’ll explore everything you need to know about building a granny flat in Perth. From zoning requirements and permits to the benefits of adding this versatile space to your home, we’ve got you covered.

Let’s get right into it.

Types of Granny Flats

1. Attached: These are extensions or modifications made to the existing home. They share at least one wall with the main house but have separate entrances and utilities, giving occupants privacy while remaining close.
2. Detached: These are standalone structures built separately from the main house, often in the backyard. They provide the most privacy and can be designed to the homeowner’s specifications.
3. Converted Spaces: Sometimes, homeowners convert garages, basements, or other existing spaces into granny flats. This can be a cost-effective option as it makes use of existing structures.

Advantages

• Additional Income: Renting out a granny flat can provide a steady stream of extra income. This can be especially beneficial in Perth’s competitive rental market.
• Increased Property Value: A well-built granny flat can significantly boost your property’s market value, making it a sound investment for the future.
• Multi-Generational Living: They are perfect for accommodating elderly parents or adult children, offering them independence while keeping them close.
• Flexible Living Arrangements: Whether you need a home office, guest house, or a space for a growing family, they offer endless possibilities.

Challenges

• Zoning and Building Regulations: Perth has specific zoning laws and building codes that can affect your ability to construct a granny flat. Navigating these can be challenging and often requires consultation with professionals.
• Cost: Costs can vary widely depending on the type, size, and materials used. Additionally, council fees, permits, and connections to utilities can add up quickly.
• Impact on Outdoor Space: Depending on the size of your property, it could significantly reduce your outdoor space, which might be a drawback for some homeowners.
• Maintenance: Just like any other building, it requires upkeep. This includes everything from regular cleaning to more significant repairs, which can add to your responsibilities.

The short answer is: yes, you can build a granny flat on your property in Perth, but there are a few essential guidelines and regulations you’ll need to follow.

Understanding these rules is crucial to ensure a smooth construction process and avoid any legal hiccups down the line. Let’s break down what you need to know to get started.

Understanding Zoning Laws

In Perth, properties are subject to local council zoning laws that determine what can and cannot be built.

Generally, most residential zones allow for the construction of a granny flat, but the specifics can vary.

For example, if your property is zoned R20 or higher, you’re typically allowed to build a granny flat without requiring additional approval, provided you meet certain criteria.

Lower-density zones might have more restrictive rules, so it’s always best to check with your local council to confirm what’s permissible on your land.

Minimum Lot Size Requirements

Another key factor is the size of your lot. In Perth, most councils require a minimum lot size of 450 square metres to build a granny flat. Some councils might have different requirements, so it’s important to verify with your specific local council.

Even if your lot meets the minimum size, there are additional considerations, such as ensuring there’s enough space for setbacks from the property boundaries and adequate outdoor areas for both dwellings.

Maximum Floor Area

In Perth, granny flats are usually limited to a maximum floor area of 70 square metres. This doesn’t include outdoor spaces like verandas or carports, but the internal living area must adhere to this limit.

The goal is to ensure the secondary dwelling remains modest in size and doesn’t overshadow the primary residence.

Compliance with Building Codes

Building a granny flat isn’t just about size and location; it must also comply with the Building Code of Australia (BCA). This includes meeting all structural requirements, fire safety standards, and accessibility provisions.

You’ll need to obtain a building permit from your local council before construction begins, and this process typically involves submitting detailed plans and specifications for approval.

Parking and Access

In most cases, you’ll need to provide an additional parking space for the granny flat, separate from the main residence.

This is to ensure that the secondary dwelling doesn’t create parking issues for neighbours or contribute to street congestion.

Utility Connections

Finally, consider how you’ll connect the granny flat to utilities like water, electricity, and sewage. Some councils require separate metres for the secondary dwelling, especially if it’s intended for rental purposes.

Ensuring you have a clear plan for connecting to existing services will save time and prevent any surprises during construction.

RECOMMENDED: How to Choose the Best Granny Flat Builder in Perth

At Portable Buildings WA, we pride ourselves on being the industry leader in granny flat construction across Perth.

With years of experience and a strong commitment to excellence, we ensure that every project is completed to the highest standards, helping you avoid costly mistakes and unnecessary delays.

Contact us today for tailored advice, a detailed quote, or to learn more about how we can bring your vision to life.