Can I Build a Granny Flat on My Brisbane Block? Here Is How to Find Out
- Jun 4
- 5 min read
According to Archistar data, 184,660 Brisbane properties have been identified as potentially suitable for granny flat development. That represents nearly a quarter of all properties in Greater Brisbane.
So, there is a good chance your block may be suitable.
However, “potentially suitable” and “definitely suitable” are not the same thing. Before you choose a design or commit to a build, you need to confirm whether your block meets a few key requirements.
This article explains the main checks Brisbane homeowners should complete before building a granny flat.
Step 1: Check Your Zoning
The first step is to confirm whether your property’s zoning allows a secondary dwelling.
Most residential zones in Brisbane allow secondary dwellings, but it is still important to check your specific property.
You can do this by using the Brisbane City Plan 2014 interactive mapping tool and entering your property address.
Look for your zone category. Common residential zones such as Low Density Residential, Low Medium Density Residential and Character Residential will often allow secondary dwellings, subject to meeting the relevant requirements.
If your property is located in a Rural zone or Environmental Management zone, different rules may apply. In this case, it is best to speak with Brisbane City Council or a qualified planning professional before proceeding.
Step 2: Check Your Available Backyard Space
A granny flat needs to physically fit on your block while still meeting setback requirements from boundaries, easements and other structures.
In Brisbane, general setback requirements for secondary dwellings may include:
Area: | General Requirement: |
Rear boundary | 3 metres minimum for a single storey structure under 4.5 metres wall height |
Side boundaries | 1.5 metres minimum in a standard residential zone |
Distance from main dwelling | No prescribed minimum, but access, privacy and site layout still need to be considered |
Dixon Homes’ granny flat designs include compact options suitable for a range of backyard sizes.
For example, some of the smallest designs start from approximately 26.6 m² and around 6 metres wide, making them suitable for relatively compact rear yards.
As a rough starting point, if your backyard is at least 10 to 12 metres deep, measured from the back of the main house to the rear boundary, there may be a good chance that a Dixon Homes granny flat can fit.
A site assessment is still recommended, as the final suitability will depend on setbacks, access, easements, slope and the exact position of your existing home.
Step 3: Confirm Your Block Size
Brisbane City Council does not set a minimum lot size for secondary dwellings in the same way some other Queensland councils do.
This means a standard 400 to 450 m² Brisbane block may still qualify, provided it can meet the relevant setback, site coverage, access and planning requirements.
If your property is outside the Brisbane City Council area, the rules may be different.
For example, councils such as Moreton Bay, Logan and Ipswich may have their own minimum lot size requirements for secondary dwellings. If your block is outside Brisbane, it is important to check the requirements with your local council before choosing a design.
Step 4: Check for Overlays
Even if your zoning allows a granny flat and your block has enough space, planning overlays can add extra requirements.
When checking the Brisbane City Plan map, look for overlays such as:
Overlay: | Why It Matters: |
Flood overlay | May require additional design considerations or minimum habitable floor levels |
Bushfire overlay | May affect construction requirements in some outer suburbs |
Character overlay | May influence the appearance, position or design of new structures |
Wetland buffer overlay | May affect setbacks or limit where a granny flat can be placed |
An overlay does not automatically mean you cannot build a granny flat. However, it may change the approval pathway, design requirements or cost.
A Dixon Homes site assessment can help identify these issues before you proceed further.
Step 5: Check for Easements
You should also check whether your property has any registered easements.
Common easements include drainage, sewerage and services easements. These are often located near the rear or side boundary of a property.
In most cases, you cannot build over a registered easement without approval from the relevant authority.
Many Brisbane properties have a drainage easement along the rear boundary. This does not always prevent a granny flat from being built, but the design may need to be positioned to maintain the required clearance.
You can check for easements by reviewing your property title or asking your conveyancer, solicitor or builder for assistance.
Step 6: Book a Site Assessment
The fastest and most reliable way to confirm whether your block is suitable is to book a Dixon Homes site assessment.
A site assessment can help:
Check: | What It Confirms: |
Site boundaries | How much usable space is available |
Building footprint | Whether a granny flat can physically fit |
Slope and soil conditions | Whether extra site costs may apply |
Site access | Whether the block is practical for construction |
Planning considerations | Whether overlays, setbacks or easements may affect the build |
Design suitability | Which granny flat designs may work for your block |
What About Steep Blocks?
Sloping blocks are common across Brisbane, particularly in parts of the inner south, west and north.
A sloping block does not automatically prevent you from building a granny flat. However, it can affect the design, construction method and final cost.
Some blocks may require additional engineering, steel piers or a suspended slab. Others may suit a design specifically created for a front to back slope or side to side slope.
If your block has a noticeable slope, a site assessment is especially important before selecting a design.
Which Brisbane Suburbs Are Most Suitable for Granny Flats?
According to Archistar data, some of the Brisbane suburbs with the highest number of potentially suitable granny flat sites include:
The Gap → Larger blocks and established residential areas
Alexandra Hills → Good block sizes and family housing demand
Redbank Plains → Larger residential blocks and investor interest
Albany Creek → Established suburb with strong rental demand
Rochedale South → Good backyard space in many properties
Outer ring suburbs often have larger blocks, more rear yard space and fewer character overlay restrictions, making them attractive for granny flat builds.
However, suitable blocks can also be found in inner and middle ring suburbs such as Chermside, Stafford, Wavell Heights and Mitchelton. These areas may have strong rental demand due to their location, access to services and proximity to employment hubs.
Ready to Check Your Block?
Dixon Homes has 49 granny flat designs available for South East Queensland, with compact designs starting from around 6 metres wide.
If you are not sure whether your block qualifies, a site assessment is the most efficient next step.
It can help confirm whether your property is suitable, identify any site challenges and match your block with an appropriate granny flat design.
Book an appointment to talk through the numbers for your block and find out which design may suit your property.
ALL PRICING IS BASED ON BRISBANE AREA RATES FOR FACADES IN THE DIXON HOMES OPTIONAL FACADES BOOKLET. PRICING IS SUBJECT TO CHANGE WITHOUT NOTICE E&OE 31.10.13 | www.dixonhomes.com
Exclusions unless otherwise specified: the construction contract does not provide for the following and/or similar items and/or their installation and/or any additional works to facilitate installation: Window furnishings; decorative light fittings; letter box; retaining walls; landscaping; fencing; driveways and paths; floor coverings; paving; fireplaces; soft furnishings; vehicles; any siteworks other than specifically stated in site estimate; any items not specified on inclusion lists and/or colour selections and/or plans, and not specifically costed in by the builder.
Dixon Homes and its employees do not provide, and are not qualified to provide, any financial, legal or taxation advice, and accepts no responsibility or liability for any financial decisions made by the client. Clients should obtain independent advice from their own solicitor, accountant, financial planner or other licensed professional, having regard to their personal circumstances, before entering into any contract or making any related financial commitment.
