When you want to build, extend or change the use of a property in NSW, the first question is which approval pathway applies. The two main options are a Development Application (DA) assessed by council, or a Complying Development Certificate (CDC) assessed by a private certifier.
They are fundamentally different processes. Choosing the right one from the start saves time, money and frustration. Here's what you need to know.
The short version
| Development Application (DA) | Complying Development (CDC) | |
|---|---|---|
| Who assesses it | Local council | Accredited private certifier |
| Typical timeframe | 3–6 months | 10–20 business days |
| Based on | Merit assessment against planning controls | Compliance with pre-set standards |
| Design flexibility | High — can vary from standards with justification | None — must meet all standards exactly |
| Available in heritage areas | Yes | No |
| Neighbour notification | Yes — neighbours can object | No — neighbours are notified after approval |
| Cost (excluding design) | Higher — more reports, longer process | Lower — streamlined documentation |
| Right of appeal | Yes — Land & Environment Court | Limited |
What is a Development Application (DA)?
A DA is a formal application to your local council seeking approval to carry out development. It's the standard pathway for most development in NSW and involves a merit-based assessment — council's planning officers review your proposal against the applicable Local Environmental Plan (LEP) and Development Control Plan (DCP) and determine whether to approve it, refuse it, or approve it with conditions.
Key features of a DA
- Assessed by council — your local planning department reviews and determines the application
- Public notification — neighbours and the public can view and submit on your application during a notification period (usually 14–28 days)
- Merit-based — there is room for justification and argument. A well-prepared Statement of Environmental Effects can support variations to development standards
- Statutory timeframes — council must determine your DA within 40 business days (residential) or 60 days (complex), though in practice many councils take longer
- Right of appeal — if refused, you can appeal to the NSW Land and Environment Court
DAs are more flexible than CDCs — they can accommodate proposals that don't strictly comply with every development standard, provided you can make a planning case for why non-compliance is acceptable. But that flexibility comes with time and cost.
What is a Complying Development Certificate (CDC)?
A CDC is a faster, private-sector approval pathway available for development that meets specific pre-set standards. If your proposal complies with all the relevant standards in a State Environmental Planning Policy (SEPP) — typically the Housing SEPP 2021 — an accredited certifier can issue a CDC without council involvement.
Key features of a CDC
- Assessed by a private certifier — not council. You choose and engage the certifier yourself
- Fast — most CDCs are determined within 10–20 business days
- Binary — your proposal either complies or it doesn't. There's no discretion and no room to argue
- No public notification period — neighbours are notified after the CDC is issued, not before
- Not available everywhere — CDCs cannot be used on heritage-listed properties, in heritage conservation areas, on flood prone land above a certain risk level, or in other excluded categories
Important: A CDC is all-or-nothing. If your proposal misses any single standard — even by a small margin — you cannot use the CDC pathway. A DA is required instead. Sometimes a minor design change unlocks the CDC pathway. This is worth checking before you go to DA.
When can you use a CDC?
In NSW, the most commonly used CDC pathway for residential development is under the State Environmental Planning Policy (Housing) 2021. It covers:
- New single dwellings on lots 450m² or larger
- Home additions and alterations (with limits on size and height)
- Secondary dwellings (granny flats) on lots 450m² or larger
- Dual occupancy in certain zones and lot sizes
- Some commercial and industrial development under the Commercial and Industrial SEPP
To use the CDC pathway, your property must not be:
- In a heritage conservation area (HCA)
- A heritage-listed item
- In a flood planning area above the relevant risk threshold
- In a bush fire prone area (for some development types)
- On certain types of constrained land (contaminated, ecologically sensitive, etc.)
When should you use a DA instead?
Even where a CDC is technically available, there are situations where a DA is the better choice:
- Your design doesn't fully comply with CDC standards and you want to argue a merit case for variation
- You want council's endorsement — some lenders and future purchasers prefer council-issued approvals
- The development is complex enough that you want council's full assessment process and conditions of consent
- You're in a heritage conservation area or the property is heritage-listed — CDC is not available
- You want the right of appeal if something goes wrong with the assessment
The practical question: which is faster for your project?
If your project qualifies for a CDC and your design can comply with the standards, a CDC is almost always faster. 10–20 business days versus 3–6 months is a meaningful difference — particularly when construction financing, lease obligations or sale timelines are involved.
The check you need to do first is: does my property qualify, and does my design comply? That takes a town planner about 30 minutes to assess. If the answer to both is yes and speed matters, you're probably going CDC. If either answer is no, you're going DA.
The rule of thumb
If you're on a straightforward residential lot, not in a heritage area, and your design fits within standard setbacks and heights — check the CDC pathway first. If your site has constraints, your design pushes boundaries, or you're in a heritage conservation area — you're in DA territory. Either way, ask a planner before you engage an architect.
What about exempt development?
There's a third category worth knowing about: exempt development. This is minor work that doesn't require any approval at all — no DA, no CDC, no notification. Examples include small garden sheds under a certain size, minor fencing, internal renovations that don't affect the structure, and some minor signage.
Exempt development categories are defined in the relevant SEPP. If your project qualifies, you can proceed without approval. A town planner can quickly confirm whether your project falls into this category.