How Much Does a Granny Flat Cost in Sydney? (2026 Pricing Guide)

Granny flats are one of Sydney’s most popular building projects — perfect for rental income, family accommodation or boosting property value. But how much do they cost?

Here’s the full breakdown.

Average Granny Flat Cost in Sydney

Most granny flats cost:

$130,000 – $280,000+

Depending on size, inclusions and site conditions.

Learn more: Granny Flats Sydney

Cost Breakdown

1. 1‑Bedroom Granny Flat

$130,000–$180,000

2. 2‑Bedroom Granny Flat

$160,000–$240,000

3. Premium Granny Flat

$220,000–$280,000+ Includes high‑end finishes and custom design.

Site Costs

Expect $10,000–$40,000 for:

• Excavation

• Drainage

• Service connections

• Retaining walls

  Approvals & Reports

  Most granny flats qualify for CDC approval, which is faster and cheaper.

  Costs include:

  • Survey

  • Engineering

  • BASIX

  • Sydney Water approvals

  Learn more: Design & Drafting Sydney

  Rental Income Potential

  Granny flats in Sydney typically rent for:

  • $380–$650 per week depending on suburb

  High‑demand areas include:

  • Blacktown

  • Schofields

  • Marsden Park

  • Penrith

    Factors That Affect Cost

    • Size

    • Layout

    • Plumbing locations

    • Roof design

    • Access for machinery

    • Materials & finishes

      Start Your Granny Flat Project Today

      Credible Homes designs and builds high‑quality granny flats across Sydney.

      Book your free consultation today.