CDC vs DA in NSW: Which Approval Pathway Do You Need for a Granny Flat in 2026
CDC vs DA in NSW: the short answer
A Complying Development Certificate (CDC) is the faster pathway when your project meets every standard in a state code.
A Development Application (DA) is required when it does not.
Department of Planning, Housing and Infrastructure (DPHI) states that a CDC can be issued in as little as 20 days, or 10 days for a NSW Housing Pattern Book design.
A DA goes through merit assessment by council.
The DPHI council league table recorded a statewide average of 84 days as at 31 May 2026.
If your granny flat, duplex or extension complies with every numeric control, a CDC usually saves time. If it misses even one standard, you need a DA.
What is complying development in NSW?
Complying development is a combined planning and construction approval for straightforward development. Council or a registered certifier can issue it.
The rules sit mainly in State Environmental Planning Policy (Exempt and Complying Development Codes) 2008, known as the Codes SEPP.
Secondary dwellings (granny flats) sit in Schedule 1 of State Environmental Planning Policy (Housing) 2021.
Assessment is a code check, not a merit judgement. If the plans meet every standard, the certificate can be issued.
Before a CDC is approved, neighbours must be notified. DPHI states the standard process allows 20 days for assessment and 14 days for neighbour notification. Pattern Book complying development allows 10 days for assessment and 7 days for notification.
What is a DA and when do you need one?
A DA is a merit assessment under section 4.15 of the Environmental Planning and Assessment Act 1979 (EP&A Act). Council weighs your proposal against the Local Environmental Plan (LEP), the Development Control Plan (DCP), any relevant SEPPs and the likely impacts. You need a DA when:
The development type is not covered by a complying development code.
The design breaches a numeric standard such as height, setbacks or landscaped area.
The land is excluded from complying development eg a heritage item or certain environmentally sensitive land.
You want council to consider a variation to an LEP development standard under Clause 4.6.
A DA approves the development only. You still need a Construction Certificate before building work starts.
How do CDC and DA compare?
Factor | CDC | DA |
Who decides | Council or registered certifier | Council or local planning panel |
Type of assessment | Code check against fixed standards | Merit assessment under section 4.15 EP&A Act |
Published timeframe | As little as 20 days (10 days for Pattern Book) | Statewide average 84 days as at 31 May 2026 |
Neighbour input | Notification only, 14 days before approval | Notification and submissions under council's community participation plan |
Construction approval | Included in the CDC | Separate Construction Certificate needed |
Flexibility on controls | None at present | Variations possible, including Clause 4.6 |
Key report | Certifier's code assessment | Statement of Environmental Effects (SEE) |
Can a granny flat be approved as complying development?
Often, yes. Under the Housing SEPP a secondary dwelling can be complying development in zones R1, R2, R3, R4 and R5 if it meets Schedule 1. The commonly applied standards include a minimum lot size of 450sqm and a 12m lot width. The maximum floor area is 60sqm, or a greater area if your LEP allows it. Only one secondary dwelling is allowed per lot, and it cannot be subdivided off. If your lot is under 450sqm or the design breaches a setback, a DA is the pathway.
Can a duplex or dual occupancy use a CDC?
A dual occupancy can be complying development under the Low Rise Housing Diversity Code in the Codes SEPP. The use must be permitted with consent on the land and the design must meet every standard in the code.
Since 1 July 2024, the Low and Mid-Rise Housing Policy has permitted dual occupancies with consent in all R2 Low Density Residential zones in NSW.
In mapped low and mid-rise housing areas, the Housing SEPP sets non discretionary standards for dual occupancies: a minimum lot size of 450sqm, a minimum lot width of 12m, a maximum floor space ratio of 0.65:1 and a maximum height of 9.5m.
Some councils have local minimum lot sizes or code variations, so check your site before you commit to a pathway.
What changed in 2026?
The Environmental Planning and Assessment Amendment (Planning System Reforms) Act 2025 created a new targeted assessment development pathway, which commenced on 21 March 2026. DPHI states it has no practical effect until a SEPP declares eligible development.
DPHI exhibited a proposed CDC variation certificate pathway from 14 May to 24 June 2026. Under the proposal, council would decide minor variations within 10 days, or 20 days where council is also assessing the CDC, and undecided variations would be deemed approved. As at October 2026 the NSW Planning Portal lists the proposal as under consideration. Until it commences, a CDC still needs full compliance.
The Statement of Expectations Order 2026 sets council DA determination targets of a 90 day average from 1 July 2026, 80 days from 1 July 2027 and 65 days from 1 July 2028.
Which pathway should you choose?
Start with a planning certificate under section 10.7 of the EP&A Act and a check of your site on the NSW Planning Portal Spatial Viewer. If every standard is met, a CDC is usually quicker and more certain. If the design needs flexibility, or the site has heritage, flooding or bushfire constraints, a DA with a clear SEE is the better route.
A Preliminary Planning Assessment before you pay for full drawings tells you which pathway is open and what it will need.
Frequently asked questions
Is a CDC faster than a DA in NSW?
Usually. DPHI states a CDC can be issued in as little as 20 days, or 10 days for a Pattern Book design. The statewide DA average was 84 days as at 31 May 2026.
Can I get a CDC if my design breaches one control?
Not at present. A CDC requires full compliance with the relevant code. A proposed variation certificate pathway was exhibited in 2026 but had not commenced as at October 2026.
Do I need a Statement of Environmental Effects for a CDC?
No. An SEE is required for a DA. A CDC is assessed by a certifier against the code standards.
What is the maximum granny flat size in NSW?
The Housing SEPP sets 60sqm of floor area, or a greater area where the LEP allows it.
Can I build a duplex in an R2 zone in NSW?
Since 1 July 2024, dual occupancies have been permitted with consent in R2 zones across NSW. Lot size, width and local controls still decide whether a CDC or a DA applies.
Who issues a CDC?
Either your local council or a registered certifier.
