If you are building, renovating or changing how a property is used in New South Wales, you may need either a Complying Development Certificate or development consent through a Development Application. These approval pathways are commonly shortened to CDC and DA.

Choosing between a CDC and DA is not simply a matter of selecting the faster or cheaper option. Your property and design must qualify for the pathway you use.

CDC vs DA: the short answer

Use a CDC when your proposal and land meet every relevant complying-development requirement and you prefer a faster, rules-based approval.

Use a DA when:

• The site or proposal is not eligible for complying development
• The design cannot meet one or more mandatory CDC standards
• You want council to assess a variation on its planning merits
• The project needs referrals or specialist assessment that prevent the CDC pathway
• The proposal is complex, unusual or likely to have significant impacts

A CDC is not a “simpler DA”. It is a different legal pathway. A certifier cannot overlook or vary a CDC standard because the proposal is otherwise reasonable. If every applicable requirement is not met, the CDC cannot be issued.

CDC vs DA comparison

NSW Planning describes complying development as a combined planning and construction approval for straightforward development, which can be issued in as little as 20 days (NSW Planning).

What is a Complying Development Certificate?

A CDC is a fast-track approval for development that meets strict standards set by NSW planning rules. It combines planning approval and construction approval in one certificate.

Potentially eligible development includes:

• New one- or two-storey homes
• Alterations and additions
• Swimming pools
• Demolition
• Some dual occupancies, manor houses and terraces
• Some commercial or industrial buildings
• Some changes of use
• Some business premises alterations

Eligibility depends on the applicable code, land zoning, site constraints and the details of the design. The main rules are found in the State Environmental Planning Policy (Exempt and Complying Development Codes) 2008, commonly called the Codes SEPP.

Because a CDC includes construction approval, you do not need a separate Construction Certificate. However, you must still appoint a principal certifier before work begins and comply with the certificate conditions and inspection requirements (NSW Government).

What is a Development Application?

A DA asks a consent authority, usually the local council, to approve proposed development. The council assesses the proposal against the relevant planning legislation, environmental planning instruments, council controls and likely impacts.

The assessment can consider:

• Zoning and permissibility
• Building height and floor space
• Setbacks, landscaping and private open space
• Streetscape and neighbourhood character
• Heritage
• Flooding, bushfire and biodiversity
• Privacy and overshadowing
• Traffic and parking
• Noise and operating impacts
• Public submissions
• The public interest

A DA pathway offers more flexibility because council can consider the merits of the proposal. This does not mean council can approve any design. The use must generally be permitted with consent, impacts must be acceptable and any variation must be properly justified.

The most important difference: fixed rules vs merit assessment

A CDC is rules-based

A complying-development standard operates like a pass-or-fail test. Your proposal must satisfy every requirement that applies (setbacks, height, floor area, landscaping, parking, screens, earthworks, stormwater, tree protection, bushfire, flood and Building Code requirements).

If a required side setback is 900 millimetres and the proposed setback is 850 millimetres, the certifier generally cannot decide that the difference is minor. The design must change or use another approval pathway.

A DA is assessed on its merits

Council still assesses numerical standards and design controls, but the DA process can allow a reasoned variation in some circumstances — for example a DCP setback variation, a Clause 4.6 request against an LEP standard, or a design response that manages privacy or overshadowing another way. A variation is never guaranteed.

When is a CDC likely to be the better choice?

A CDC may be the better option when all of the following are true:

1. The proposed development type is covered by an applicable complying-development code.
2. The use is permitted on the land.
3. The property is not excluded by a site constraint.
4. The design meets every relevant standard.
5. The required plans, certificates and technical evidence can be provided.
6. You are willing to adjust the design to remain within the rules.

When is a DA likely to be the better choice?

A DA may be required or strategically preferable when:

• The development type is not covered by a complying-development code
• The proposed use requires consent but is not eligible for a CDC
• The design exceeds a mandatory CDC height, setback, floor-area or landscaping limit
• The property is a heritage item or affected by heritage restrictions
• The land has significant bushfire, flooding, coastal, contamination or biodiversity constraints
• The proposal needs an approval or concurrence that prevents complying development
• Protected tree removal cannot be resolved before the CDC
• You want to retain a design that does not fit the CDC envelope

Property constraints that can prevent a CDC

Complying development is not available on every property. Important issues can include:

• A heritage item or certain heritage conservation areas
• Critical habitat or environmentally sensitive land
• High-risk bushfire land, including some BAL-40 or Flame Zone land
• High-risk flood areas, floodways or flood-storage areas
• Significantly contaminated land
• Certain acid sulfate soil categories
• Coastal or foreshore hazards
• Wilderness areas
• Certain drinking-water catchments
• Easements or covenants affecting the building location
• Lack of lawful road access
• Unresolved stormwater, driveway or tree-removal approvals

Can I change my design to qualify for a CDC?

Often, yes. If the problem is a design standard rather than a land exclusion, you may be able to reduce height, increase setbacks, reduce GFA or site coverage, add landscaped area, adjust privacy elements, reduce excavation, or change stormwater or parking arrangements.

Before making changes, ask: How much usable space would be lost? Would the building still meet the owner's needs? What would redesign cost? How much time might a CDC save? Is the CDC outcome genuinely certain after redesign?

CDC vs DA timeframes

An eligible and complete CDC can be much faster than a DA. NSW Planning states that complying-development approvals can be issued in as little as 20 days, compared with an average DA determination time of 70 days (NSW Planning). Actual timing depends on completeness, notification, referrals and information requests.

CDC vs DA costs

Total cost depends on the council or certifier, project value, complexity, required documents and specialist reports. Do not compare only the application fee — compare the full approval pathway, including redesign, reports, certification and the value of any floor area or design features given up to achieve CDC compliance.

NSW Planning says homeowners may save up to $15,000 when building a house through complying development and up to $2,600 for renovations, although actual savings depend on the project (NSW Planning).

CDC vs DA neighbour notification

CDC notification

Neighbours cannot make a formal submission on a complying development application. In metropolitan areas, the council or certifier must generally notify neighbours within 20 metres that an application has been made 14 days before it can be approved. Before construction, the applicant must notify neighbours within 20 metres at least seven days before work in metropolitan areas (two days in rural or release areas) (NSW Planning Portal).

DA notification

Council may notify neighbours or publicly exhibit a DA under its community participation plan. Neighbours can make submissions and council must consider relevant planning issues raised. An objection does not automatically cause refusal.

Do I need a Construction Certificate?

• CDC: Combines planning and construction approval, so no separate Construction Certificate.
• DA: Building work generally needs a Construction Certificate after DA consent and before construction starts.

Both pathways normally require the appointment of a principal certifier before building work begins. Never start work merely because a DA has been approved (NSW Government).

What documents are needed?

Common CDC documents

• Certificate of title
• Survey
• Site plan
• Architectural plans
• Building specifications
• Structural plans
• BASIX certificate
• Stormwater plan
• Owner consent
• Bushfire, flood or engineering evidence
• Design verification for certain housing types

Common DA documents

• Site plan, floor plans, elevations and sections
• Survey
• Statement of Environmental Effects
• Landscape and stormwater plans
• BASIX certificate
• Waste-management plan
• Shadow diagrams
• Heritage, traffic, acoustic or environmental reports
• Clause 4.6 variation request
• Owner consent

Common CDC mistakes

Assuming a common project is automatically eligible

A new home, extension or pool may qualify, but the property and design still need to meet every applicable condition.

Checking the design but not the land

Perfect setbacks will not solve a land-based exclusion such as certain heritage, flood or bushfire conditions.

Treating a small breach as acceptable

A certifier does not have the same discretion as a council assessing a DA variation.

Choosing CDC only because it appears cheaper

Include design changes, technical reports, certifier fees and the value of lost development potential in the comparison.

Common DA mistakes

Using a DA without checking CDC eligibility

Some applicants enter a slower process when their project could have used complying development.

Assuming council will approve every variation

A merit pathway provides flexibility, not guaranteed acceptance.

Submitting a generic Statement of Environmental Effects

The SEE should match the property, drawings, planning controls and likely impacts.

Forgetting the Construction Certificate stage

DA consent alone generally does not authorise building work to start.

A five-step CDC or DA decision test

1. Check the development type. Is the proposed work covered by an exempt or complying-development code? If not, investigate the DA pathway.
2. Check the land. Review zoning, heritage, bushfire, flooding, biodiversity, contamination, acid sulfate soils, coastal hazards, title restrictions and access.
3. Test the design. Measure the design against every applicable CDC standard.
4. Identify the gaps. List every failed or uncertain requirement. Decide whether each issue can be resolved.
5. Compare the whole project outcome. Compare timing, total cost, approval risk and design value.

Quick decision checklist

A CDC may suit your project if:

• ☐The development type is covered by an applicable code.
• ☐The use is permitted on the land.
• ☐The property is not excluded.
• ☐Every design standard can be met.
• ☐Required technical evidence is available.
• ☐You value speed and certainty.
• ☐You are willing to adjust the design to comply.

A DA may suit your project if:

• ☐The project is not eligible for a CDC.
• ☐The site has constraints requiring merit assessment.
• ☐The design cannot meet a CDC standard.
• ☐You need council to consider a justified variation.
• ☐The project is complex or unusual.
• ☐Retaining the preferred design is more important than the fastest pathway.

Frequently asked questions

Important information. This guide provides general information and does not constitute legal, planning, architectural, engineering, certification or other professional advice. CDC and DA requirements can change and vary between properties, development types and councils. Check the current legislation and requirements with the relevant council or a registered certifier before relying on a particular approval pathway.