Building a granny flat in Sydney has become one of the most effective ways to generate extra income, boost property value, and create flexible living spaces. With increasing rental demand and limited housing supply, many Sydney homeowners are turning their backyards into profitable assets.
But not all suburbs deliver the same return on investment (ROI). Location plays a huge role in determining how much rent you can earn, how fast you can find tenants, and the long-term capital growth your property will achieve.
In this guide, we rank Sydney’s best suburbs for building a granny flat in 2026, based on rental returns, property prices, council approval efficiency, and tenant demand.
- Why Sydney is a Hotspot for Granny Flats in 2026
- Key Factors That Influence ROI
- Top Sydney Suburbs for Granny Flat Investment in 2026
- 1. Blacktown – Sydney’s Top Performer for ROI
- 2. Penrith – Affordable Entry, Strong Returns
- 3. Campbelltown – Growing Infrastructure and Opportunity
- 4. Mount Druitt – Affordable with Strong Rental Appeal
- 5. Liverpool – Central, Connected, and Consistent
- 6. St Marys – Airport Growth and Infrastructure Boom
- 7. Quakers Hill – Popular Among Families
- 8. Rooty Hill – Balanced Affordability and Growth
- 9. Fairfield – Consistent Performance Over Time
- 10. Glenfield – Connected and Growing
- Tips to Maximise ROI When Building a Granny Flat
- Conclusion
Why Sydney is a Hotspot for Granny Flats in 2026
Sydney’s property market continues to evolve, but the appeal of granny flats is stronger than ever. Rising interest rates and housing affordability challenges have pushed more renters to seek affordable housing options, while homeowners are finding ways to maximise their existing land.
Granny flats are in high demand for several reasons:
- Rising rental prices: Tenants are looking for affordable, private living spaces.
- Flexible use: Homeowners can use granny flats for family, home offices, or rental income.
- Council support: NSW planning laws allow most homeowners to build granny flats faster through Complying Development Certificates (CDC).
- Excellent ROI: Many investors achieve rental yields between 6–10% annually.
Key Factors That Influence ROI
Before diving into the suburb rankings, it’s essential to understand what affects your potential return:
- Land Size and Zoning: Larger, flat blocks are easier and cheaper to build on.
- Council Regulations: Some councils have faster processing times for granny flat approvals.
- Tenant Demand: Areas with universities, hospitals, or transport links attract more renters.
- Construction Costs: Building costs vary depending on access, materials, and slope.
- Average Rents: Suburbs with higher rent-to-cost ratios provide better ROI.
Top Sydney Suburbs for Granny Flat Investment in 2026
Below is a list of Sydney’s best suburbs to build a granny flat, based on current trends, rental performance, and local development potential.
| Rank | Suburb | Median House Price (2026) | Average Granny Flat Rent (Weekly) | Estimated ROI (%) | Highlights |
| 1 | Blacktown | $950,000 | $480 | 9.2 | High rental demand, large backyards, diverse tenants |
| 2 | Penrith | $880,000 | $450 | 8.8 | Affordable land, strong population growth |
| 3 | Campbelltown | $820,000 | $430 | 8.5 | Rapid infrastructure and new developments |
| 4 | Mount Druitt | $870,000 | $460 | 8.2 | Excellent access to transport and affordable rents |
| 5 | Liverpool | $980,000 | $500 | 8 | Central location with consistent rental demand |
| 6 | St Marys | $890,000 | $460 | 7.9 | Close to Western Sydney Airport projects |
| 7 | Quakers Hill | $1.05M | $520 | 7.8 | Family-friendly area with good schools |
| 8 | Rooty Hill | $900,000 | $440 | 7.6 | Ideal for dual-income households |
| 9 | Fairfield | $970,000 | $480 | 7.5 | Diverse rental market and solid capital growth |
| 10 | Glenfield | $1.02M | $490 | 7.4 | Easy transport access and rising demand |
1. Blacktown – Sydney’s Top Performer for ROI
Blacktown continues to lead the pack with strong rental returns and steady property value growth. The suburb’s large blocks make granny flat construction straightforward, and rental demand remains high due to its central Western Sydney location. Tenants include young professionals, small families, and students from nearby universities.
2. Penrith – Affordable Entry, Strong Returns
Penrith has seen consistent population growth and government investment in infrastructure. With the Western Sydney Airport nearby, future demand is expected to rise. Land remains more affordable than inner suburbs, making it ideal for investors who want a low-cost, high-return granny flat project.
3. Campbelltown – Growing Infrastructure and Opportunity
Campbelltown’s ongoing redevelopment projects have transformed it into one of Sydney’s most promising investment areas. It offers a good balance between affordability, transport access, and rental demand, making it a strong performer for granny flat investors.
4. Mount Druitt – Affordable with Strong Rental Appeal
Mount Druitt has gained attention from first-home buyers and investors looking for value. Many older homes sit on large lots, perfect for adding a granny flat without compromising outdoor space. Rental returns are among the highest in Western Sydney.
5. Liverpool – Central, Connected, and Consistent
Liverpool offers excellent transport connections and amenities, attracting both families and students. Granny flats here typically achieve above-average rent and strong occupancy rates year-round. Proximity to the upcoming Aerotropolis makes it even more appealing.
6. St Marys – Airport Growth and Infrastructure Boom
St Marys is rapidly growing due to its proximity to the new Western Sydney Airport. The suburb is becoming a hub for trades, logistics, and new residential development. Building a granny flat here in 2026 could position owners for long-term capital gains.
7. Quakers Hill – Popular Among Families
Quakers Hill combines suburban charm with modern infrastructure. Local schools, parks, and transport links make it a sought-after area for families. A granny flat here can be easily rented to small families or couples seeking affordable housing.
8. Rooty Hill – Balanced Affordability and Growth
Rooty Hill remains one of Western Sydney’s underrated suburbs. With good block sizes, affordable homes, and strong rental yields, it’s an attractive option for those looking to maximise ROI through dual occupancy.
9. Fairfield – Consistent Performance Over Time
Fairfield is known for its multicultural community and consistent rental demand. The area’s central location and access to amenities make it a safe, long-term investment choice for homeowners wanting steady rental income.
10. Glenfield – Connected and Growing
Glenfield’s strategic location near major transport corridors and employment hubs makes it ideal for granny flats. The suburb offers strong rental demand and excellent access to education and shopping facilities, enhancing tenant appeal.
Tips to Maximise ROI When Building a Granny Flat
If you are planning to invest in one of these suburbs, keep these practical tips in mind:
- Choose a professional builder: Select a licensed granny flat specialist who understands NSW regulations and can handle the entire project efficiently.
- Focus on design and function: Modern layouts, private entrances, and quality finishes attract better tenants and increase rent.
- Check council rules: Each suburb has specific planning requirements, so always confirm setbacks, lot sizes, and height limits before building.
- Invest in quality materials: Durable finishes and insulation will reduce maintenance costs and improve tenant satisfaction.
- Market effectively: Highlight the benefits such as proximity to transport, schools, or hospitals to attract reliable long-term tenants.
Conclusion
Granny flats continue to be one of Sydney’s most practical and rewarding investments in 2026. Whether you are building in Blacktown, Penrith, or Campbelltown, choosing the right location can significantly boost your return on investment and long-term property value.
If you are ready to start your project, Granny Flats X can help you design and build a high-quality granny flat tailored to your block and budget. Our expert team manages every stage of the process, ensuring you get the best result from your investment.
Get a free quote today and see how we can turn your backyard into a valuable asset.