Granny flats are no longer just for ageing parents or teenagers who need extra space.

Across South East Queensland, owners now look at secondary dwellings for rental income, multi-generational living, guest accommodation, work-from-home space and resale appeal.

The planning side can look simple from the outside. In some cases, it is. A small, well-located granny flat on a standard residential block may only need building certification and plumbing approvals. In other cases, the same idea can trigger a town planning application, design changes, engineering issues, flood checks, bushfire assessment or extra costs before construction can start.

The main lesson is simple. Do not assume your neighbour’s approval path applies to your site.

What is a granny flat?

In Queensland planning terms, a granny flat is usually called a secondary dwelling.

A secondary dwelling is a smaller dwelling used with the main dwelling house on the same lot. It may be attached to the house, detached in the backyard, located under the existing house, or built above part of the main dwelling, depending on the council rules and site conditions.

It is different from a dual occupancy. A dual occupancy is normally two dwellings on one lot, or two dwellings on separate lots that share common property. Redland City Council clearly explains that a dual occupancy does not include a residential use involving a secondary dwelling.

This distinction matters because a secondary dwelling cannot usually be sold separately from the main house. Redland City Council states that a secondary dwelling is an extension of the dwelling house use, is subordinate to the primary dwelling and cannot be separately sold.

Can you rent out a granny flat in Queensland?

Yes, but that does not mean you can build one without approvals.

In 2022, the Queensland Government changed the rules so homeowners can rent secondary dwellings to anyone, not just family members. This made granny flats more useful as a housing and rental option. The same government guidance also confirms that the change did not remove the need to obtain relevant development approvals, building approvals or comply with other requirements such as fire safety.

That point often gets missed. The rental rule changed, but the approval pathway still depends on your council, your land and your design.

Do you need a Development Application for a granny flat?

Not always! Many granny flats are accepted development for town planning purposes if they meet the planning scheme requirements. That means a town planning Development Application may not be required.

But you will usually still need building approval from a private building certifier. You may also need plumbing approval, engineering, stormwater details, sewer checks, energy efficiency documentation and site-specific design work.

A town planning application may be needed where:

Issue	Why it matters
The granny flat is too large	It may no longer be treated as subordinate to the main house
Setbacks do not comply	Side, rear or frontage setbacks can trigger planning or siting issues
The site has overlays	Flood, bushfire, coastal, character, vegetation or biodiversity overlays can add requirements
The land is steep	Sloping sites can affect height, access, retaining walls, earthworks and drainage
Parking does not work	Some councils require extra car parking for the secondary dwelling
The design looks like a second house	Council may consider whether it is really a dual occupancy or another residential use
Services are difficult	Sewer, water, stormwater and driveway access can affect cost and feasibility
Existing structures are not approved	Unapproved sheds, decks or previous works can slow the process

The safest approach is to check planning before you pay for full working drawings or sign a building contract.

Council-by-council guide for SEQ granny flats

The table below is a practical guide only. It does not replace a site-specific planning check.

Council	General level of difficulty	Main things to check
Brisbane City Council	Often practical on standard residential lots	Character, flooding, overlays, site cover, setbacks, height and whether the proposal remains a dwelling house with secondary dwelling
Logan City Council	Often practical where the site is suitable	Size, location, parking, services, building approval and whether it stays on one title
Ipswich City Council	Becoming more supportive in many residential areas	City Plan 2025 requirements, siting, flooding, services, slope and overlays
Moreton Bay City Council	Can be practical, but design details matter	Parking, setbacks, height, site cover, road presentation, overlays and local constraints
Gold Coast City Council	Can work well, but many sites need care	Slope, coastal hazards, flood, access, parking, stormwater and privacy
Redland City Council	Works on suitable sites, but separate sale is not an option	Subordinate scale, title limitations, services, coastal and environmental constraints
Sunshine Coast Council	Can be workable, but site constraints often matter	Slope, bushfire, flood, vegetation, access, parking, sewer and character of the locality

Brisbane City Council granny flats

Brisbane is often one of the better-known councils for secondary dwellings because many owners are looking for extra space on established residential lots.

Under Brisbane City Plan 2014, a dwelling house can include two dwellings where one is a secondary dwelling. Council also makes clear that a house is not a dual occupancy, rooming accommodation, short-term accommodation, student accommodation or multiple dwelling.

That means the design needs to remain within the dwelling house framework. If the granny flat starts to function like a separate second house, or if the site has overlays, character controls or flood issues, the approval pathway can change.

Brisbane owners should check City Plan Online before starting. Council states that City Plan Online can be used to search a property and view zoning, overlays, neighbourhood plans and infrastructure information. This helps identify whether planning approval may be required.

Common Brisbane issues include character homes, pre-1947 controls, flood mapping, overland flow, small lots, difficult sewer connections and tight setbacks.

Gold Coast granny flats

Gold Coast City Council describes a secondary dwelling as a separate living area that is smaller and subordinate to the main house. Council also notes these were previously called granny flats or family accommodation.

The Gold Coast can be straightforward on a normal suburban block with good access, room for parking and manageable stormwater. It becomes harder on steep land, narrow lots, sites with retaining walls, flood-prone land, canal or coastal locations, or properties affected by vegetation or bushfire constraints.

The Gold Coast also has many properties where access is not simple. A modular or craned-in granny flat may sound easy, but a crane lift, tight side access, overhead powerlines, retaining walls or limited street space can affect buildability.

Logan granny flats

Logan City Council describes a secondary dwelling as a self-contained dwelling beside, behind, below or above the primary dwelling house. It can be attached or detached.

Logan’s domestic housing fact sheet also states that a secondary dwelling is on the same lot and has the same owner as the primary dwelling. It is included as part of the dwelling house use definition.

Logan can be a practical area for granny flats because many suburbs have larger residential lots and a wide range of house types. The main checks are usually setbacks, parking, sewer, stormwater, flooding, slope and whether any overlays affect the land.

Logan also makes clear that most domestic building work needs building approval and that building certification must be sought from a private building certifier.

Moreton Bay granny flats

Moreton Bay has quite detailed secondary dwelling guidance. Council’s planning scheme information sheet states that a secondary dwelling requires one designated car parking space in addition to the parking required for the main dwelling. It also states that a secondary dwelling should comply with standard dwelling house requirements such as site cover, boundary setbacks and building height, and should appear as a single dwelling with the primary dwelling from the road frontage.

This is useful because it shows what Council is looking for. A granny flat should not read from the street like a second separate house. The built form still needs to relate to the main dwelling.

Moreton Bay can be practical in many suburbs, but the site type matters. Coastal villages, rural residential land, flood-prone land, environmental overlays and older areas with difficult access may need more checking before plans progress.

Redland granny flats

Redland City Council gives one of the clearest warnings for owners. A secondary dwelling is subordinate to the primary dwelling and cannot be separately sold.

This matters for anyone thinking a granny flat can become a separate title or a future sale opportunity. In most cases, that is not how secondary dwellings work.

Redlands can suit granny flats on the right land, but it has many properties affected by coastal, environmental, island, servicing, access and flooding constraints. The Southern Moreton Bay Islands, coastal suburbs and larger vegetated sites often need a more careful review.

Sunshine Coast granny flats

Sunshine Coast Council identifies secondary dwellings as granny flats or annexed units and defines them as a dwelling used with, and subordinate to, a dwelling house on the same lot.

The Sunshine Coast can suit secondary dwellings where the site is flat, serviced and has clear access. It can become more complex where there is slope, bushfire, vegetation, flooding, rural residential land, narrow access, or a need for extra retaining walls.

Sunshine Coast Council also points users to its planning scheme codes, which include the dwelling house code, transport and parking code, stormwater management code and vegetation management code. These codes can become relevant depending on the site and the type of work proposed.

Ipswich granny flats

Ipswich is worth watching closely because its new planning scheme is more supportive of secondary dwellings in many established residential areas. Ipswich City Council states that the Ipswich City Plan 2025 introduced new opportunities from 1 July 2025 to encourage secondary dwellings and dual occupancies in established suburban residential areas.

Council has also said its approach to secondary dwellings, where planning approval will not be needed to build a granny flat on certain properties, could provide opportunities for 22,000 homes across Ipswich.

That does not mean every Ipswich site is simple. Flooding, mining constraints, slope, biodiversity, services, existing approvals and building siting can still affect the outcome. Ipswich Council also states that buildings and structures are generally to be positioned in accordance with Ipswich City Plan 2025, and preliminary building approvals or building location envelopes may affect a property.

Why some granny flats are craned in, stumped or built on slabs

The construction method is not just a builder preference. It often comes down to site conditions, budget, access and approval requirements.

A craned-in or modular granny flat can suit sites with good street access and enough room for delivery. It may reduce construction time on site. It may not suit narrow streets, tight side access, overhead powerlines, steep land or sites where the crane setup is hard to manage.

A stumped granny flat can suit sloping land, flood-affected land or sites where reducing excavation is helpful. It may also help with airflow and ground clearance. But it can affect overall building height, privacy, stairs and visual bulk.

A slab-on-ground granny flat can suit flatter sites with simple access and manageable ground conditions. It may be cost-effective and familiar to builders. But it can be harder where the land falls away, where drainage is poor, or where the site needs large amounts of cut, fill or retaining.

The best option depends on the site. A slab may be cheaper on one property and expensive on another. A modular build may be fast on one lot and impractical on a tight Brisbane character block.

What plans and approvals are usually involved?

A typical granny flat process may include:

1. Site check

Check zoning, overlays, lot size, easements, sewer, stormwater, access, slope, flood levels and existing approvals.

2. Concept design

Prepare a basic design that shows size, location, setbacks, access, parking, private open space and how it relates to the main house.

3. Survey

A detail and contour survey is often needed where levels, setbacks, buildings, services, trees, drainage or site constraints need to be shown accurately.

4. Planning review

Confirm whether the proposal is accepted development or whether a town planning application is needed.

5. Building design

Prepare full plans for certification and construction. These usually include floor plans, elevations, sections, site plan and construction details.

6. Engineering and services

This may include structural engineering, slab or footing design, stormwater design, sewer connection details, driveway design or retaining wall details.

7. Building certification

A private building certifier checks the building work against the building code and relevant siting requirements. Even if no planning DA is needed, building approval is still usually required.

8. Plumbing and drainage

New bathrooms, kitchens, laundries and sewer connections generally need plumbing approval.

9. Construction and inspections

The builder and certifier manage inspections during construction before final certification.

Tips before you spend money on a granny flat

• Do not start with a full set of building plans if you are unsure about planning. A short site check can save money.
• Do not assume “family only” rules still apply. Queensland changed the rental rules in 2022, but approvals still matter.
• Do not assume a secondary dwelling can be sold separately. In normal cases, it remains part of the main property.
• Check services early. Sewer and stormwater can change the cost.
• Check access early. A good design on paper may be hard to build if there is no practical way to get materials, machinery or a module into the backyard.
• Be careful with unapproved structures. If the property already has unapproved work, that can affect certification and sale.
• Think about privacy. A poorly placed granny flat can create overlooking, noise and access conflicts between the main house, the granny flat and neighbours.
• Think about future buyers. A well-approved, well-designed secondary dwelling can help a property. An awkward, unapproved or non-compliant one can become a problem during sale, insurance or refinancing.

Final take

Granny flats can be a good way to add space, house family, create rental income and improve the use of a property. But the approval path is not the same across South East Queensland.

Brisbane, Logan, Ipswich and parts of Moreton Bay can be relatively practical for standard residential sites. Gold Coast and Sunshine Coast can also work well, but slope, coastal conditions, flood and access often matter. Redlands can suit secondary dwellings, but owners need to understand that a granny flat remains subordinate to the main dwelling and cannot usually be separately sold.

The best first step is not a full design package. It is a site-specific planning and building check. That tells you whether the granny flat is likely to be simple, whether a DA is needed, and what design changes may reduce cost and risk before the project gets too far.