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FAQ Granny Flats NSW

Granny Flats in NSW: Common Questions & Answers

Can I build a granny flat on my property in NSW?

Usually, yes. However, it depends on zoning and specific site constraints like bushfire prone land, flooding, easements, heritage items, and minimum site frontage.

  • The Pathway: Most granny flats are approved via Complying Development Certificate (CDC), which is a fast-track process.

  • The Exception: If your site doesn’t meet specific CDC criteria (e.g., it’s a Heritage item or in a high-risk bushfire zone), a DA (Development Application) pathway may still work.

CDC vs DA: What’s the difference for granny flats?

CDC (Complying Development Certificate) is generally faster and more straightforward. It is a private certification process used when a site meets all the specific state codes (setbacks, height, etc.). DA (Development Application) is assessed by your local Council. This is required when a site doesn’t satisfy strict CDC criteria or requires a variation to the rules. We can advise on the best pathway before you spend money on detailed drawings.

What stops a granny flat from being approved as CDC?

Common blockers for CDC include:

  • High Bushfire Attack Levels (BAL-40 or Flame Zone).

  • Flood control lots.

  • Heritage restrictions or critical habitat areas.

  • Easements (pipes or access ways) blocking the build zone. The only way to be sure is a quick check of your Section 10.7 Certificate and site constraints.

How big can a granny flat be?

Under the NSW Housing SEPP, the standard maximum interior floor area is 60m². However, this limit applies to the habitable space. Patios, verandas, garages, and carports can often be added in addition to this 60m² limit, provided you stay within site coverage and landscaping controls. We design to maximize this footprint rather than forcing a “one-size-fits-all” box.

Do I need BASIX for a granny flat?

Yes. New builds over a certain size require a BASIX certificate. This ensures the dwelling meets NSW targets for energy and water efficiency. BASIX requirements will dictate your glazing, insulation, hot water system, and rainwater tank size. We coordinate these inputs to ensure the design is compliant without being over-engineered.

Do I need parking for a granny flat?

Not always. There is no blanket requirement for an additional off-street car space for a granny flat under the SEPP (unless specific local council rules override in a DA scenario). However, if you want parking, we can design it to work with setbacks and turning circles to ensure it is practical.

Can I build a granny flat in a bushfire area?

Yes, in most cases. However, the cost and design will depend on your Bushfire Attack Level (BAL).

  • Low to Moderate Risk: Generally suitable for CDC.

  • High Risk (Flame Zone): Will likely require a DA and specific construction materials (fire-rated windows, cladding, etc.). We can confirm your BAL rating and pathway after a quick site review.

How long does granny flat approval take?

  • CDC: Typically 10–20 days once all plans and engineering reports are submitted.

  • DA: Typically 3–6 months, depending on your local Council’s workload and the complexity of the site. We will map out the likely timeline for you once we confirm the correct pathway.

What drawings do I need?

To get a builder quote and approval, you generally need a “Construction Certificate” set. This includes:

  • Site Plan & Floor Plan

  • Elevations & Sections

  • Shadow Diagrams (if two-storey)

  • Stormwater & Sediment Control Plans

  • BASIX Certificate commitments We produce builder-ready drawings so you get accurate quotes, not estimates.

How do I know if my site is feasible?

Use our free online checker. You don’t need to guess. We have built a specific tool to help you check your address against NSW planning rules.

  1. Enter your details: Tell us about your block (slope, trees, existing house).

  2. Get an initial view: See immediately if your site is “Likely,” “Borderline,” or “Unlikely” for approval.

  3. Expert Review: We will manually review your site constraints and email you a plain-English summary of your options.

Use the Granny Flat Feasibility Checker

 

(written by Dale Moore with the help of AI)

 

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