Granny flats — also called secondary dwellings — are one of the most popular building projects on the Gold Coast. Whether you want extra accommodation for family, a rental income stream, or a home office with full amenities, understanding the regulations is essential before you start planning.
This guide covers the current rules for building a granny flat on the Gold Coast, including size limits, approval requirements, and rental restrictions.
In most cases, yes — but with conditions. Queensland legislation allows secondary dwellings (granny flats) on residential properties subject to specific rules about size, location, and use.
The maximum size for a secondary dwelling in Queensland is generally:
80 square metres is enough for a comfortable one or two-bedroom unit with a combined living/kitchen area, bathroom, and small laundry.
| Layout | Approx. Size | Description |
|---|---|---|
| Studio/1-bed | 40 – 55 sqm | Open-plan living/kitchen, 1 bedroom, bathroom |
| Large 1-bed | 55 – 70 sqm | Separate living and kitchen, 1 bedroom, bathroom, laundry |
| 2-bed | 65 – 80 sqm | Living, kitchen, 2 bedrooms, bathroom, laundry |
Every granny flat on the Gold Coast requires Building Approval from a private certifier. This is non-negotiable — even a small studio needs certified plans that comply with the NCC. See our guide to the Gold Coast council approval process for the full picture.
Whether you need a Development Approval (DA) from Gold Coast City Council depends on your specific property and the granny flat’s design. In many cases, a compliant secondary dwelling can be approved through the building approval process alone (self-assessable development), without a separate DA.
However, a DA may be triggered if:
Your building designer can determine early in the process whether a DA is needed.
Secondary dwellings must comply with the same setback requirements as the primary dwelling:
Maximum building height applies to the secondary dwelling just as it does to the primary dwelling — generally 9 metres in low-density residential zones. Most single-storey granny flats sit well under this limit. For more on height and setback rules, see our guide to Gold Coast building codes and regulations.
The granny flat’s footprint is added to the primary dwelling’s footprint for site cover calculations. The combined coverage must not exceed the maximum site cover for your lot (typically 50%).
An additional car parking space may be required for the secondary dwelling, depending on your zone and council requirements. This is often one of the trickiest requirements to meet, especially on smaller lots.
Windows and outdoor living areas of the granny flat should be designed to minimise overlooking of the primary dwelling and neighbouring properties. This may require screening, offset window placement, or strategic landscaping.
The granny flat needs its own connections to water, sewer, electricity, and potentially separate metering if it will be rented. Service connection costs can add $5,000-$15,000 to the project.
| Cost Component | Typical Range |
|---|---|
| Design and documentation | $3,000 – $6,000 |
| Engineering | $2,000 – $4,000 |
| Council/certifier fees | $2,000 – $4,000 |
| Infrastructure charges (if applicable) | $15,000 – $30,000 |
| Construction (60-80sqm) | $120,000 – $220,000 |
| Service connections | $5,000 – $15,000 |
| Landscaping and fencing | $5,000 – $15,000 |
| Total | $152,000 – $294,000 |
The biggest variable is whether council infrastructure charges apply. For secondary dwellings, infrastructure charges may be reduced or waived in some circumstances — your designer or town planner can advise.
Construction costs for granny flats typically run $2,000-$2,800 per square metre, which is comparable to or slightly higher than a standard home on a per-square-metre basis. The cost per sqm is higher because kitchens and bathrooms (the most expensive rooms) represent a larger proportion of the total floor area in a small dwelling. For broader cost context, see our guide on building designer costs.
This is one of the most asked questions about granny flats on the Gold Coast, and the answer has been evolving.
Queensland’s secondary dwelling rules have been subject to ongoing reform. As of 2026, the rules around renting secondary dwellings vary depending on your local council area and the specific zoning of your property.
On the Gold Coast, secondary dwellings in most residential zones can be used for accommodation for family members or as rental accommodation, subject to certain conditions including:
Important: These rules have been changing. Check the current Gold Coast City Council position and seek advice from a town planner before making investment decisions based on rental income from a granny flat.
A well-designed granny flat on the Gold Coast can generate $350-$550 per week in rental income (2026 market rates), depending on location, size, and quality. At the higher end, this represents $26,000+ per year in rental income against a construction cost of $150,000-$250,000.
If you’re considering a granny flat primarily for rental income, you should also consider a dual occupancy (duplex) development. Key differences:
| Feature | Granny Flat | Dual Occupancy |
|---|---|---|
| Maximum size | 80sqm | No limit (subject to site) |
| Separate title | No — stays on same lot | Yes — can be separately titled |
| Sale separately | No | Yes (if subdivided) |
| Infrastructure charges | May be reduced | Full charges apply |
| Planning process | Often self-assessable | Usually requires DA |
| Construction cost | $150,000 – $250,000 | $300,000 – $600,000 per unit |
A dual occupancy gives you more flexibility (can sell units separately) but costs more and has a more complex approval process. A granny flat is faster, cheaper, and simpler — but can’t be sold independently.
Design and approval: 8-12 weeks. Construction: 12-20 weeks. Total timeline from first consultation to moving in: approximately 6-8 months.
Yes, provided you meet all setback, site cover, and access requirements. The granny flat must comply with the same building regulations as any other dwelling. A common configuration is placing the granny flat at the rear of the property with access via a side driveway.
Not necessarily, but the granny flat needs accessible parking. This can often be achieved using the existing driveway with an additional parking space. Your designer will assess the best solution for your property.
Technically yes, provided it stays within the 80sqm GFA limit and complies with height and setback requirements. However, a two-storey granny flat on a standard block may face setback and privacy challenges. Most granny flats are single storey.
Prefabricated and modular granny flats are available on the Gold Coast and can reduce construction time. However, they still require building approval, must comply with all regulations, and need professional design to suit your specific site. The cost savings over traditional construction are often less than expected once site works, connections, and compliance costs are factored in.
Building a granny flat on the Gold Coast is achievable on most residential properties, subject to the 80sqm size limit and standard building regulations. Costs typically range from $150,000 to $300,000 including design, approvals, and construction.
The key is to engage a building designer early to assess your property’s suitability, navigate the approval requirements, and design a granny flat that maximises the available 80 square metres. A well-designed granny flat adds value to your property and can provide useful accommodation or rental income.
Design Science designs granny flats and secondary dwellings on the Gold Coast. We assess your property’s suitability, navigate council requirements, and design a granny flat that maximises your 80sqm allowance. Book a $280 consultation to get started.
David Steadman
Licensed Builder & Building Designer
David Steadman is the founder of Design Science, a Gold Coast building design practice backed by over 30 years of hands-on construction experience. One of few Australians holding both a QBCC Builder's Licence and Building Designer licence, David brings a rare combination of design thinking and practical building knowledge to every project.
