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Design
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Size
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Finishes
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Extras
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Location
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ROI
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Quote

What type of granny flat do you want?

Select the design that suits your property and lifestyle.

Selected
Studio granny flat
Studio Open-plan living. Ideal for singles or rental income.
Selected
1 Bedroom granny flat
1 Bedroom Separate bedroom. Perfect for couples or long-term tenants.
Selected
2 Bedroom granny flat
2 Bedroom Maximises the 60m² SEPP allowance. Highest yield.
Selected
3 Bedroom granny flat
3 Bedroom Maximum living space. Best for families or premium rent.

Please select a design type to continue.

What size are you considering?

NSW SEPP (Housing) 2021 allows secondary dwellings up to 60m² of habitable floor area.

Compact — up to 35m² Lower build cost, quicker to construct.
Standard — 36 to 50m² Our most popular choice. Balances cost and liveability.
Maximum — 51 to 60m² Full SEPP allowance. Best for rental yield.

Please select a size to continue.

What level of finishes are you after?

Finish quality affects both build cost and achievable weekly rent.

Entry Practical and durable. Meets NCC 2025 standards. Best cost-to-yield ratio.
Mid-Range Stone benchtops, quality fixtures, engineered floors. Most popular.
Premium Designer selections, full landscaping. Commands top-end rents.

Included as standard across all builds

  • Daikin Split System Air Conditioning
  • Floor to Ceiling Tiles in Bathroom
  • 6 Year Structural Warranty

Your Options

Flooring
Roof

Please select a finish level to continue.

Any extras to include?

Select any additional features. These are added to your base estimate.

Deck / Alfresco+$12,000 est.
Carport+$18,000 est.
Solar Panels+$8,000 est.
Ducted Air Con+$5,000 est.
Internal Laundry+$6,000 est.
Storage / Garden Shed+$4,000 est.

Where is your property located?

Your suburb helps us estimate achievable rental income based on local market data.

We cover 40+ Sydney LGAs. Rental figures sourced from Domain / SQM Research Q4 2025.

Your estimated results

Based on your selections and local market data.

Build Cost Est.—
Weekly Rent Est.—
Annual Income—
Gross Yield—
Gross Annual Return
—
Based on 52 weeks fully tenanted
Vacancy rates in Greater Sydney remained below 2% throughout 2024–25. Ref [1]
Gross Yield on Cost
—
Return on build cost
Granny flats in key Sydney suburbs achieve 7–10%+ gross yields. Ref [2]
Break-Even
—
Years to recover build cost
Rental income only, excluding capital uplift.
Est. Property Value Uplift Ref [3]
$150,000–$250,000
Added to total property market value
A compliant granny flat typically adds $150,000–$250,000 to a Sydney property’s market value. Ref [3] [4]
Data Sources & References
  1. [1] Sydney vacancy rates below 2%. Source: Sydney Home Renovation Guide (2026).
  2. [2] Gross yields 7–10%+. Source: In House Granny Flat (2025).
  3. [3] Value uplift $150k–$250k. Source: Buildana (2026).
  4. [4] Source: Sydney Home Renovation Guide (2026).
  5. [5] Two-bedroom Sydney granny flats rent $350–$600/week. Source: Fundd 2025 Granny Flat Guide.
  6. [6] Build cost estimates. Source: Buildana (2026).
  7. [7] Rental data by suburb. Source: Domain / SQM Research Q4 2025, compiled Q1 2026.

Important Disclaimer

All figures produced by this calculator are estimates only and do not constitute financial advice, investment advice, or a formal building quote.

Build cost estimates are based on published market ranges for compliant secondary dwellings in Greater Sydney as at Q1 2026. Actual costs vary based on site conditions, slope, soil type, services connection, and council requirements.

Rental income figures are indicative weekly median asking rents from Domain / SQM Research Q4 2025. Vacancy, management fees, maintenance, and holding costs are not included. 5 Star Granny Flats recommends obtaining a formal fixed-price quote, independent property valuation, and independent financial advice before making any investment decision. Figures reflect market conditions as at Q1 2026.

Get your free, no-obligation quote

Our team will review your selections and contact you within one business day with a tailored estimate.

Please fill in your name and phone number.

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Your enquiry has been received. A member of our team will contact you within one business day to discuss your granny flat project.

In the meantime, call us on 1300 843 921.

Come Visit
our display home

Visit our display home to experience the quality for yourself — touch the finishes, test the materials, and explore the full range of design options available to you. You’ll get to speak directly with our experienced granny flat designers, view examples of our past builds, and visualise what your own space could look like.

An appointment at our display home gives you everything you need to make informed decisions — and move forward with confidence.

Book your visit today and start planning your perfect granny flat.

2 Mary St, Blacktown 2148

Call 1300 843 921 Get a Quote