Class 2 Building Approval Pathways: DA vs CDC for Apartments in NSW (2026)
By Franz Phan, Registered Design Practitioner, giantA Pty Ltd
If you are developing a multi-unit residential building in New South Wales, choosing between a Development Application (DA) and a Complying Development Certificate (CDC) is arguably the most consequential decision you will make before construction begins. Get it right and you can shave months off your timeline and tens of thousands of dollars off holding costs. Get it wrong and you may find yourself redesigning the project halfway through council assessment, or worse, facing a refusal after 90 days of waiting.
In 2026, the stakes are even higher. The NSW Government is proposing landmark reforms to the complying development system, including a new variation pathway that would allow minor departures from development standards without triggering a full DA. For apartment developers, investors and builders working on Class 2 buildings, understanding where CDC ends and DA begins — and where the new reforms create a middle ground — is essential.
What Is a Class 2 Building Under the BCA?
A Class 2 building is defined under the National Construction Code (NCC) Volume One as "a building containing two or more sole-occupancy units, each being a separate dwelling." In practice, this means apartment buildings, multi-unit residential developments and single-storey attached dwellings with common spaces below (such as a residential building above a shared carpark).
Class 2 buildings are subject to some of the most stringent compliance requirements in the NCC, particularly in fire resistance (Section C), acoustic separation (Section J) and structural adequacy. Because multiple households share walls, floors and egress paths, the building must demonstrate higher levels of fire safety, sound insulation and structural integrity than a standalone Class 1 house. This is why the approval pathway matters so much: a CDC is only available if the design can meet the prescriptive standards set out in the Codes SEPP without deviation.
DA vs CDC: The Fundamental Difference
A Development Application (DA) is the traditional planning approval pathway. The application is lodged with the local council, which assesses the proposal against the relevant Local Environmental Plan (LEP), Development Control Plan (DCP) and State Environmental Planning Policies (SEPPs). Council has discretion to approve, refuse or approve with conditions. The process is merit-based and allows for design flexibility, but it is also slower and less certain.
A Complying Development Certificate (CDC) is a fast-track approval that combines planning and construction approval in a single step. If the proposal meets all the prescriptive standards in the Codes SEPP, an accredited certifier (not council) must issue the certificate. The certifier does not have discretion: if the design complies, approval is guaranteed. The trade-off is that the design must fit within strict parameters — setbacks, height limits, floor space ratios, fire safety provisions and more.
Comparison Table 1: DA vs CDC for Class 2 Buildings
| Criteria | Development Application (DA) | Complying Development Certificate (CDC) |
|---|---|---|
| Approving authority | Local council | Accredited private certifier |
| Assessment basis | Merit-based discretion | Prescriptive compliance |
| Typical timeline | 80–120+ days | 20 days (10 days for Housing Pattern Book) |
| Direct cost | $8,000–$25,000 | $3,000–$6,000 |
| Design flexibility | High — can negotiate departures | Low — must meet all Codes SEPP standards |
| Applicable to Class 2 | Yes — all projects | Yes — but only if standards are met |
| Construction certificate | Required separately after DA | Included in CDC |
| Appeal pathway | Land and Environment Court | Internal review / NCAT |
When Can a Class 2 Building Use CDC?
Not every Class 2 project can use CDC. The Codes SEPP sets specific thresholds for multi-unit residential buildings. In 2026, a Class 2 development may qualify for CDC if it meets criteria related to:
- Maximum building height (typically 2–3 storeys depending on zone)
- Setbacks from boundaries (front, side and rear)
- Floor space ratio (FSR) limits
- Site coverage and landscaped area
- Fire safety and separation distances
- Car parking and bicycle storage provisions
Importantly, if the site is affected by a heritage conservation area, bush fire prone land, flooding or coastal hazards, CDC is usually not available. Similarly, if the design requires a minor departure from any Codes SEPP standard — even a 0.5-metre setback shortfall — the project must go through the DA pathway.
Comparison Table 2: CDC Eligibility Checklist for Class 2 Projects
| Requirement | CDC Compliant | Triggers DA |
|---|---|---|
| Site area | ≥ 200 m² (typical minimum) | < 200 m² or irregular shape |
| Building height | Within Codes SEPP limit for zone | Exceeds maximum height |
| Front setback | Meets minimum prescribed distance | Any departure from standard |
| Side setback | Meets minimum prescribed distance | Any departure from standard |
| Bush fire prone land | BAL-29 or lower (check SEPP) | BAL-40 or BAL-FZ |
| Heritage | No heritage conservation area | Heritage listing or conservation area |
| Flood prone land | Not flood prone | Flood prone or floodway |
| Fire separation | Meets minimum distance to boundary | Requires performance solution |
Real Project Example 1: Three-Storey Apartment in Parramatta
We recently advised a developer on a 12-unit, three-storey apartment building in Parramatta. The site was 850 m², zoned R3 Medium Density Residential, with a minimum front setback of 4.5 metres under the Codes SEPP. The initial design positioned the building 3.8 metres from the front boundary to maximise the rear courtyard.
Because the 0.7-metre shortfall triggered a departure from the Codes SEPP, CDC was not available. The project proceeded through the DA pathway with City of Parramatta Council. The DA took 94 days from lodgement to determination, including a request for additional information on acoustic separation between units. Council approved the project with a condition requiring upgraded glazing on the western facade to address heat gain.
Total approval cost: $18,500 (DA fees, acoustic report, shadow diagram, BASIX certificate). Had the design been adjusted to meet the 4.5-metre setback, the CDC pathway would have cost approximately $4,500 and been approved in 20 days.
Real Project Example 2: Dual-Occupancy with Class 2 Component in Blacktown
In Blacktown, we worked on a project comprising a dual-occupancy dwelling with a secondary dwelling above a shared garage. Because the total floor area and height fell within the Codes SEPP thresholds for R2 Low Density Residential, the project qualified for CDC. An accredited certifier issued the Complying Development Certificate 18 days after lodgement.
The developer saved an estimated $12,000 in holding costs (interest, rates and consultant fees) compared with a DA. Construction commenced within four weeks of approval. The project was completed in eight months and both units were tenanted within two weeks of completion.
Real Project Example 3: Mixed-Use Development in Liverpool
A client in Liverpool proposed a four-storey mixed-use building with retail on the ground floor and six residential units above. The site was zoned B4 Mixed Use, which permitted the use but introduced additional Codes SEPP requirements for commercial-residential interfaces.
Because the building exceeded three storeys and included a commercial component, CDC was not available for the overall development. The project required a DA with Liverpool City Council, including a traffic impact study and a retail acoustic assessment. The DA process took 112 days and the Construction Certificate added another 21 days. Total professional fees exceeded $28,000.
The Proposed CDC Variations Pathway (2026)
The NSW Government is currently reviewing feedback on proposed reforms to the complying development system. The key change is a new CDC variations pathway that would allow minor departures from development standards to be assessed more efficiently, without requiring a full DA.
Under the proposal, if a project is "substantially compliant" with the Codes SEPP but has one or two minor departures — such as a slight setback shortfall or a marginal height excess — the applicant could seek a variation through the CDC pathway. The certifier would assess the variation against specific criteria, including impact on neighbours, consistency with the streetscape, and compliance with the overall intent of the SEPP.
This is significant for Class 2 developers. Currently, a project that is 95% compliant must still go through the full DA process. Under the proposed reforms, that same project might be approved via CDC with a variation, saving 60–80 days and $10,000–$20,000 in holding costs. The reforms were exhibited between 14 May and 24 June 2026 and are expected to be finalised later this year.
BASIX and Class 2 Buildings: What Applies Where
All residential developments in NSW, including Class 2 buildings approved via CDC or DA, must comply with BASIX requirements for water, energy and thermal performance. For Class 2 buildings, BASIX applies to the overall building, not individual units. The BASIX certificate must be lodged with the application.
From 1 October 2023, the thermal performance standard for BASIX increased to 7 stars under NatHERS for most new residential buildings in NSW. Class 2 buildings must also meet the materials index (embodied emissions) introduced under the updated Sustainable Buildings SEPP. For more detail, see our 7-Star NatHERS guide and BASIX compliance checklist.
Comparison Table 3: Cost Breakdown — DA vs CDC for a Typical 8-Unit Class 2 Project
| Cost Item | DA Pathway | CDC Pathway |
|---|---|---|
| Planning / certifier fees | $5,000–$12,000 | $2,000–$4,000 |
| Additional consultant reports | $3,000–$8,000 | $500–$1,500 |
| BASIX certificate | $400–$600 | $400–$600 |
| Construction certificate (separate) | $2,000–$4,000 | Included in CDC |
| Holding costs (interest, rates, 90 days) | $6,000–$15,000 | $1,500–$3,000 |
| Total estimated cost | $16,400–$39,600 | $4,400–$9,100 |
Regulated Designs and the Design and Building Practitioners Act 2021
Since 1 July 2021, Class 2 buildings have been subject to the Design and Building Practitioners Act 2021 (DBP Act). Under this legislation, a registered design practitioner must prepare "regulated designs" for building elements and performance solutions, and lodge compliance declarations on the NSW Planning Portal before construction work begins.
For developers, this means you cannot simply hand a set of architectural drawings to a builder and commence work. The design must be reviewed and declared by a practitioner registered with NSW Fair Trading. At giantA, we are registered as Design Practitioners under the DBP Act and can prepare and lodge regulated designs for Class 2 projects across Sydney and NSW.
FAQ: DA vs CDC for Class 2 Buildings in NSW
Can all Class 2 buildings use the CDC pathway?
No. Only Class 2 buildings that fully comply with the prescriptive standards in the Codes SEPP can use CDC. If the site is affected by heritage, bush fire, flooding or the design requires any departure from SEPP standards, a DA is required.
How long does a DA take for a Class 2 building in NSW?
A standard DA for a multi-unit residential building averages 80–120 days from lodgement to determination, depending on the council, complexity and whether additional information is requested. Some councils participate in the Development Coordination Authority (DCA) pilot, which targets 50 days for low-rise residential.
Is a Construction Certificate required after a DA for Class 2?
Yes. After DA approval, a separate Construction Certificate (CC) is required before building work can commence. The CC verifies that the construction documentation complies with the Building Code of Australia (BCA/NCC). A CDC combines planning and construction approval, so no separate CC is needed.
What is the proposed CDC variations pathway?
The NSW Government is introducing a new pathway that would allow minor departures from Codes SEPP standards to be assessed through the CDC system rather than requiring a full DA. This is expected to benefit projects that are close to, but not fully, compliant. The reforms were exhibited in mid-2026 and are expected to be finalised later this year.
Do Class 2 buildings need BASIX?
Yes. All residential developments in NSW require a BASIX certificate for water, energy and thermal performance. Class 2 buildings must comply with the 7-star NatHERS thermal performance standard and the materials index for embodied emissions.
Who can prepare regulated designs for Class 2 buildings?
Only a registered design practitioner under the DBP Act can prepare and declare regulated designs for Class 2 buildings. This includes architectural designs, structural engineering, fire safety engineering and performance solutions. At giantA, Franz Phan is a registered design practitioner for Class 2 buildings.
Can I switch from DA to CDC if my design changes?
Yes, if the revised design fully complies with the Codes SEPP. Some developers lodge a DA as a fallback while simultaneously preparing a CDC-compliant design. If the CDC is approved, the DA can be withdrawn. This strategy requires careful coordination with your certifier and council.
What happens if my CDC application is refused?
If a certifier determines that the proposal does not meet complying development standards, you have two options: revise the design to achieve compliance and re-lodge, or switch to the DA pathway. The certifier will provide specific reasons for the refusal, which can guide your next steps.
Conclusion
Choosing between a DA and a CDC for a Class 2 building in NSW is a decision that should be made at the earliest possible stage — ideally before the design is finalised. The CDC pathway offers speed, certainty and lower costs, but only for projects that fit neatly within the Codes SEPP parameters. The DA pathway offers flexibility and discretion, but at the cost of time and money.
With the proposed CDC variations pathway on the horizon, 2026 may offer a middle ground for projects that are close to compliance. For now, the best strategy is to engage a registered design practitioner early, assess both pathways against your specific site and design, and choose the route that delivers the best balance of speed, cost and design freedom.
At giantA, we help developers, investors and builders navigate Class 2 approval pathways every day. If you are planning a multi-unit residential project in Sydney or regional NSW, contact us for a feasibility assessment and approval strategy.
About the author: Franz Phan is a Registered Design Practitioner under the NSW Design and Building Practitioners Act 2021 and Director of giantA Pty Ltd, a Sydney-based design and building consultancy specialising in multi-residential and commercial projects.