❓ Frequently Asked Questions – Custom Home Designs in NSW

1. How much does it cost to get custom home plans in NSW?

The cost of custom home plans in New South Wales typically ranges from $1,500 to $10,000+, depending on:

• Home size

• Design complexity

• Sloping or difficult blocks

• Level of documentation required

• Engineering and BASIX inclusion

Concept plans are usually at the lower end, while full construction-ready plans with engineering and compliance documents cost more.

2. Do I need BASIX for a new home in NSW?

Yes. All new homes in NSW require a BASIX Certificate before approval.

BASIX (Building Sustainability Index) ensures your home meets energy and water efficiency standards. Without a BASIX certificate, you cannot lodge your Development Application (DA) or Complying Development Certificate (CDC).

3. What is the difference between CDC and DA in NSW?

A Complying Development Certificate (CDC) is a fast-tracked approval pathway for homes that meet strict planning rules.

A Development Application (DA) is required if your design does not meet CDC standards and must be assessed by your local council.

CDC approvals are usually quicker (2–4 weeks), while DA approvals can take 6–12+ weeks depending on complexity.

4. Can I build a custom home on a sloping block in NSW?

Yes — but it requires careful design and engineering.

Sloping blocks often need:

• Split-level design

• Retaining walls

• Suspended slabs or raised floors

• Site-specific engineering

Custom design is often the best option for maximising views and minimising excavation costs.

5. Do I need engineering for custom home designs in NSW?

Yes. Structural engineering is required before a Construction Certificate is issued.

This usually includes:

• Footing and slab design

• Wind classification compliance

• Bracing and tie-down details

• Structural certification

Engineering must align exactly with your approved architectural plans.

6. How long does it take to get custom home plans approved in NSW?

Timeframes vary depending on the approval pathway:

• CDC: 2–4 weeks (if compliant)

• DA: 6–12+ weeks

• Construction Certificate: 2–4 weeks

Design time before submission typically takes 2–6 weeks depending on complexity.

7. Is custom home design better than buying pre-drawn house plans?

Custom home design is better when:

• Your block is narrow or sloping

• You want to maximise sunlight or views

• You have specific lifestyle needs

• You want better resale positioning

• You need to meet strict council controls

Pre-drawn plans can work for flat, standard blocks, but custom design often saves money long-term by avoiding redesign and engineering changes.

8. Can I design a custom granny flat in NSW?

Yes. NSW has clear granny flat regulations, and many blocks qualify under CDC pathways.

A custom granny flat design can help:

• Maximise rental income

• Fit awkward backyard spaces

• Improve privacy between dwellings

• Meet BASIX and setback requirements

9. What documents are required to build a custom home in NSW?

Typically, you will need:

• Architectural plans

• Site plan

• BASIX Certificate

• Structural engineering

• Soil test report

• Stormwater design

• Construction Certificate

Additional reports may be required for bushfire or flood-prone areas.

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