Complying development. What the 12 conditions actually require.
Complying development sounds like a fast track. It is, but only if you meet all 12 conditions. Miss one and you are in a full development application pathway with months of delay.
Complying development is the planning system's fast track. A Complying Development Certificate (CDC) can be issued by a private certifier in 20 to 40 days, compared to 8 to 26 weeks for a full development application. The cost is lower, the certainty is higher, and the documentation is simpler.
The catch: 12 specific conditions must all be met. Miss one and you fall back to the full DA pathway. This post unpacks the 12, with the conditions that catch out buyers most often.
What complying development is
Complying development is a planning approval pathway under the NSW Environmental Planning and Assessment Act 1979 (and equivalents in other states). It applies to development that meets predetermined criteria. Because the criteria are predetermined, no merit assessment is required. A certifier checks the proposal against the criteria and either issues the CDC or refuses.
The 12 conditions below are written for the NSW Housing Code (the most commonly used complying development code). Other codes (Commercial Code, Subdivision Code) have their own conditions but follow the same logic.
The 12 conditions
1. Land zone
The lot must be in a zone where the proposed development is identified as "complying development" in the code. R1, R2, R3, and R4 zones (residential) typically permit dwelling-house complying development. Some special zones (E2, E3, E4, RU1) do not.
2. Site size
The lot must meet the minimum lot size for the zone. R2 typically requires 200 to 450 square metres depending on council. R3 typically 200 to 300.
3. Frontage
Minimum frontage typically 6 to 12 metres depending on zone and council. The frontage rule is checked at the narrowest point.
4. Heritage / character
The lot must not be heritage-listed at any tier and must not sit in a heritage conservation area. The reason: heritage areas require merit assessment that cannot be predetermined.
5. Hazard overlays
The lot must not be in a flood planning area, bushfire prone land at BAL-29 or higher, coastal hazard area, landslip risk area, or acid sulfate soil class 1 or 2.
(Lots at BAL-12.5 to BAL-19 typically remain eligible with additional conditions. Above that, full DA.)
6. Setbacks
The proposed dwelling must comply with the minimum front, rear and side setbacks specified in the code. The code numbers may differ from the council DCP. The complying code is its own document.
7. Maximum height
The proposed building height must not exceed 8.5 metres (typical for two-storey residential complying development). The height is measured to the ridge from natural ground level.
8. Maximum floor area
The proposed total floor area must not exceed the limits in the code, typically 360 to 460 square metres for a dwelling depending on lot size.
9. Site coverage
The footprint of the building must not exceed the site coverage limit in the code, typically 50 to 60% of the lot.
10. Solar access
The proposed building must demonstrate solar access to the living room of the proposed dwelling AND to the principal private open space of any neighbouring dwelling. The solar access is calculated at winter solstice.
11. Privacy
The proposed building must comply with privacy provisions: window-to-window distance, screening to overlooking windows, restrictions on first-floor balcony positions.
12. Stormwater
The development must demonstrate adequate stormwater management, either by connecting to the council system or by on-site detention. Plans must be certified by a hydraulic engineer.
The three conditions that catch out the most
In my experience watching DAs across the seven Sydney councils we cover, the three conditions that disqualify the most buyers from complying development are:
Hazard overlays (condition 5)
Buyers do not check whether the lot is in a flood planning area, BAL-29+, or coastal hazard. Many lots in inner Sydney suburbs are in one of these and the buyer's assumed "complying development" pathway is unavailable.
Heritage character (condition 4)
Heritage conservation areas cover large portions of inner Sydney, inner Brisbane and inner Melbourne. A property in an HCA is automatically excluded from complying development. Buyers often assume that because their specific dwelling is not heritage-listed, the HCA rule does not apply. It does.
Solar access (condition 10)
The solar access calculation is exact. It uses true north and the winter solstice sun angle. Some proposed buildings fail at the design stage because the architect did not realise the council's required solar access window cannot be met on the lot's orientation.
When complying development saves you the most
Three scenarios where complying development is materially better than a full DA:
- A straightforward two-storey dwelling on a clear lot in a permissive zone. 20-40 day approval vs 12-20 weeks. $4,000-8,000 in CDC fees vs $15,000-25,000 in DA fees plus consultants.
- A dual occupancy on a complying lot. Some councils allow dual-occupancy complying development. The 8-12 week assessment vs 24-40 weeks is a real saving.
- A subdivision on a complying lot. Where the council code permits subdivision via complying development (limited to certain zones and lot sizes), the timeline is half that of a full DA.
When complying development does not save you
Three scenarios where the CDC pathway is not faster:
- Heritage areas. Full DA required regardless. Often longer because of heritage impact statements.
- Bushfire-prone land at BAL-29+. Full DA required because of merit assessment of fire safety.
- Anything that triggers Section 4.55 modification later. If you anticipate needing to vary the approval after the CDC issues, you may end up with a longer total timeline than a DA that anticipated the variation.
The 5-minute pre-purchase check
Before you bid on a property where complying development matters to your plans:
- Confirm the zone permits complying development (most R zones do).
- Check the lot is not in any heritage area.
- Pull the hazard overlays (SafeBuy or council planning portal).
- Confirm the lot meets the minimum size and frontage.
- Confirm the proposed build (rough sketch) meets setbacks, height, and floor area.
If all five are yes, complying development is on the table. If any is no, plan for a full DA timeline.
Complying development is a real time and money saver when it applies. Knowing whether it applies before exchange is one of the highest-leverage moves in pre-purchase due diligence.
