Guide
CDC or DA: which approval do you need?
The question every NSW project starts with, and the one most often answered by hope.
The short version
A complying development certificate is approval by compliance. If your site and your design meet every standard in the codes, a registered certifier issues the certificate and council is not involved. Fast, predictable, and unavailable the moment one test fails.
A development application is approval by judgement. Council assesses the proposal on merit against its local environmental plan, its development control plan and section 4.15 of the Act. Slower, but it can carry a variation, an awkward site, and a proposal no code contemplated.
You do not choose between them. The site and the proposal choose for you.
Four things decide it
1. The land. Heritage items and heritage conservation areas, flood control lots, bushfire prone land, landslide risk, foreshore and coastal land. Some close complying development outright; others add standards. This is the most common cause of a project turning out to be a DA.
2. The zone and the lot. The codes set minimum lot areas, minimum widths at the building line, and specific requirements for battle-axe and corner lots. A lot below any of them is out.
3. The development type. Each code covers particular kinds of development, and the boundaries are not intuitive. A secondary dwelling is not a dwelling house for the Housing Code. Dual occupancies sit under a different code again. Alterations that don't add floor area sit under another.
4. The design. Height, floor area, setbacks, landscaped area, privacy, parking. Complying development has no discretion, and eligibility is cumulative — every test has to pass.
Councils can also vary the state standards for their own area, so a figure that holds in one LGA may not hold across the boundary.
What each costs you in time and money
A CDC is cheaper on fees and much cheaper on time. It also costs you design freedom — the scheme has to fit exactly inside the box, and on a constrained site that can mean giving up something you actually wanted.
A DA costs more in fees, in consultant reports and in months. What it buys is the ability to argue: for a variation under clause 4.6, for a design that answers the objective behind a control without meeting its number, or for a proposal on a site the codes never anticipated.
The expensive mistake is not choosing the slower route. It is designing for one pathway and discovering you are on the other.
Where to go next
- Complying development certificates — what the Housing Code allows, and what closes it
- Development applications — what the SEE has to do, and how clause 4.6 works
- All approval pathways, including modifications and building information certificates
- What the whole project costs, with the approval stack in it
Common questions
Which is faster, a CDC or a DA?
A complying development certificate, substantially. It is issued by a registered certifier against a fixed set of standards with no council assessment. A development application is a merit assessment by council and takes considerably longer, particularly if a request for further information is issued.
Can I appeal if my site does not qualify for complying development?
There is nothing to appeal. Complying development is a compliance test with no discretion in it — a proposal either meets every standard or it does not. If it does not, the route is a development application, where the merits can be argued.
Does being in a heritage conservation area stop complying development?
For external work, generally yes. Heritage items and heritage conservation areas take a project out of the codes for external alterations. Internal-only work may still be exempt or complying development.
Is a flood-affected property automatically a DA?
In most cases a flood control lot closes the complying development pathway, though the codes contain flood provisions that keep it open in defined circumstances. It has to be checked against the specific classification rather than assumed either way.
If I only miss one standard by a small amount, can it still be a CDC?
No. There is no tolerance and no minor-variation provision in complying development. A scheme 200 mm over a standard is a development application.
Do I need a construction certificate after a CDC?
No. A complying development certificate covers both the planning approval and the construction approval. A separate construction certificate is only needed after a development consent.
General information about NSW planning, current at September 2026. Not advice on a particular site — the instruments are amended often and councils vary them locally.
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