What is a Development Application (DA) in NSW?
- Marisa Watterson
- May 28
- 3 min read
What is a Development Application in NSW?
A Development Application (DA) is a formal request to a local council for permission to carry out development on a parcel of land. In NSW, DAs are governed by the Environmental Planning and Assessment Act 1979 (EP&A Act) and assessed against the applicable Local Environmental Plan (LEP), Development Control Plan (DCP) and any relevant State Environmental Planning Policies (SEPPs).
Most people associate DAs with new homes or extensions, but they apply across a much broader range of activity including change of use, subdivision, commercial fit-outs and demolition.
In short: A DA is the standard pathway to obtain council approval for development in NSW. Without one, you may be carrying out unlawful development.
When Do You Need a DA?
Not all development requires a DA. Some works are classified as exempt development (no approval needed) or complying development (a faster certificate pathway). A DA is required when your proposed development does not meet the criteria for either of those pathways.
Common situations that require a DA include:
Constructing a new dwelling or significant addition
Changing the use of a premises (e.g. from a shop to a cafe)
Subdividing land
Constructing a secondary dwelling or dual occupancy
Opening a childcare centre, medical practice or place of public worship
Works within a heritage conservation area or to a heritage item
The DA Process in NSW: Step by Step
Pre-application research: Review the LEP to confirm the proposed use or works are permissible on the land. Check the DCP for design and performance standards.
Engage a town planner (recommended): A town planner NSW can identify issues early and prepare the required documents.
Prepare the application: This includes a Statement of Environmental Effects, site plans, shadow diagrams, drainage plans and any specialist reports.
Lodge the DA: Applications are lodged through the NSW Planning Portal. Council acknowledges receipt and may request additional information.
Notification and assessment: Council notifies neighbours and assesses the application against relevant controls.
Determination: Council approves (with or without conditions), refuses or defers the application.
Real-World Examples
Example 1: Retail to cafe A business owner wants to open a cafe in a shop that previously operated as a clothing store. This is a change of use. Even if no structural works are planned, a DA is required because the land use category changes and additional controls (such as car parking, ventilation and waste management) apply.
Example 2: Rear extension in a heritage area A homeowner in a heritage conservation area wants to add a rear extension. Even if the works would otherwise qualify as complying development, the heritage overlay means a DA is required and a Heritage Impact Statement may need to accompany it.
Common Misconceptions
"I only need a DA for building work." Not true. A DA may be required purely for a change of use, even where no physical building works are proposed.
"If my builder says it's fine, I don't need council approval." Builders are not planning authorities. Only council (or an accredited certifier for complying development) can grant lawful approval.
"A small job won't need a DA." Scale is not the primary test. Permissibility, land use category and heritage constraints determine whether a DA is needed.
Frequently Asked Questions
Do I need a DA for internal renovations?
Minor internal works that do not change the use or structural elements of a building are often exempt. Check the exempt development provisions in the relevant SEPP.
How much does a DA cost in NSW?
Council fees are set by regulation and vary based on the estimated cost of works. A town planner, architect and specialist consultants will add to the overall cost.
Can I start work before my DA is approved?
No. Starting work before consent is granted is unlawful development under the EP&A Act.
What is the difference between a DA and a CDC?
A CDC (Complying Development Certificate) is a faster approval pathway for straightforward projects that meet pre-set standards. A DA is required when a project does not meet those standards or involves more complex planning considerations.
How long does a DA take to be determined?
The statutory timeframe is 40 days for most applications, but complex DAs often take longer. Council may also issue a request for additional information, which pauses the clock.
What happens if my DA is refused?
You can request a Review of Determination, lodge an appeal with the Land and Environment Court, or amend and resubmit the application.
