The Development Application Process: What to Expect (and How to Avoid the Common Mistakes)
August 16, 2026by Alex MachkevitchBlogDual OccupancySubdivision
Most DA delays in NSW are avoidable, and they start before you lodge
For anyone who has not lodged a Development Application before, the process can seem complex. Whether the project is a minor home renovation, a new build, or a change of use approval for a new business, there is a considerable amount of work between the initial idea and final approval. Design preparation, supporting reports, public notification, council assessment, and a realistic amount of waiting while all of this happens.
This article sets out how the process actually works, from the preparation stage through to lodgement and determination. If you want the specific traps rather than the process, our companion article covers the 10 most common DA mistakes and how to avoid them.
What is a Development Application?
A local Development Application (DA) is a formal approval from your local council to carry out development. That might be a new build, an extension, a change of use, or something as simple as a new driveway, an additional room, or a pergola in the back yard.
Every DA is assessed against a set of council specific planning rules that apply to your site. In NSW these usually include a Local Environmental Plan (LEP) and a Development Control Plan (DCP). Depending on the site there may be other policies which are relevant, including heritage controls, flood or bushfire provisions, or State Environmental Planning Policies, which can override council controls for certain types of development.
Do I need a DA for my project?
Not every change to a property needs a full Development Application, and it is worth checking this before you get too far into planning.
Some minor works are exempt development, meaning no approval is needed provided they meet a strict set of criteria around size, location, and construction materials. A small deck, a garden shed, or minor internal refurbishment may meet these requirements, however this must be confirmed against the State exempt development codes.
Other projects may qualify for a Complying Development Certificate (CDC), which still needs approval but is assessed against a fixed checklist of state wide standards rather than council specific controls, and can often be approved much faster through a private certifier.
Quick Reminder: What is the difference between a DA and CDC?
A DA allows council planners to assess your design on its merits, considering things like streetscape, neighbour impacts, and local character. This can be more flexible but carries more risk, as Council can refuse to grant it.
A CDC is a fast-track approval that can be issued by a private certifier or Council. If you meet every requirement exactly, you must be approved, and there is no subjective decision making by council.
The catch is that exempt development and CDC require strict compliance with the relevant state wide standards, so what looks like a simple job on paper does not always qualify. It is worth having this checked early, because assuming something is exempt when it is not can result in unauthorised work that has to be removed or regularised retrospectively. Further guidance on exempt and CDC pathways is available through the Planning Approval Pathways information on the NSW Government’s planning website.
If a project does not fit either pathway, it needs a standard DA lodged with the local Council. Certain sites are also excluded from relying on exempt or CDC pathways because of specific constraints affecting the land, such as:
- listed heritage items,
- land within a Heritage Conservation Area,
- land affected by flooding or bushfire risk,
- sites containing other environmentally sensitive features.
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When does a change of use require a DA?
A change of use occurs where a property is proposed to be used for a purpose different from its current or approved land use. This is a common trigger for a Development Application, particularly for commercial and retail premises. Converting a former retail shop into a café, an office into a childcare centre, or a warehouse into a gym would all typically constitute a change of use.
Whether a DA is required depends largely on the approved use, how the site is zoned, and what use is proposed. Even where a proposed use is permitted by the land zoning, council is required to assess whether the new use is compatible with the existing building and site, having regard to matters such as available parking, accessibility, the Building Code of Australia (BCA), hours of operation, noise, and amenity impacts on neighbouring properties.
In some cases a change of use is relatively straightforward, particularly where the new use has a similar impact and operating hours to the previous one. Where the new use is more intensive, generates additional traffic or parking demand, or involves earlier or later operating hours, a more detailed assessment is required. Additional supporting reports such as a traffic study, BCA report, access report or acoustic report may be necessary.
Even where physical building works are minimal or not proposed at all, a change of use can still require a development application in its own right, because it is the use of the land that triggers the need for approval. Confirming the planning requirements early avoids delays during assessment, or worse, a business operating without the required consent. In some circumstances, change of use applications can be carried out under CDC with a private certifier.
What should I do before lodging a DA?
This is the stage applicants are most inclined to rush in order to lodge as quickly as possible, yet it is the stage that delivers the greatest benefit when given proper consideration.
Before finalising any design, it is worth understanding what the site can and cannot do. Every property has its own set of constraints. Zoning, height limits, floor space ratio, setbacks, heritage listings and easements all shape what is achievable. A good planner or architect will review the relevant planning controls early and work the design around them.
It is equally important to identify at an early stage which specialist reports the site and application type are likely to require, rather than leaving this until the design has been locked in. Depending on the site’s characteristics this may include a heritage impact statement, a flood report, a bushfire assessment, an arborist report, or other studies specific to the constraints affecting the land.
Reviewing these requirements early allows the findings to inform the design rather than being addressed retrospectively. A flood report, for example, may influence required finished floor levels, while an arborist report may affect the siting of a building relative to a protected tree. Engaging with these considerations from the start generally leads to a more efficient design and assessment process, and reduces the likelihood of major redesigns later.
This is also the stage to review whether your project actually needs a DA, or whether it might qualify for a faster pathway like CDC. Where a project is eligible, CDC offers significant advantages over the standard DA process, as it is assessed against a fixed set of standards and avoids council DA assessment timeframes. That usually means a faster turnaround and greater certainty of outcome, so it is worth confirming eligibility from the outset, or considering whether minor amendments to the design could bring the project within the CDC criteria.
Does my development need to comply with Council’s LEP and DCP?
One of the key advantages of the standard DA pathway over CDC is that it allows council to undertake a genuine merit assessment of the proposal, taking into account the particular characteristics and constraints of the site. Where strict compliance with a standard such as height, floor space ratio, or setbacks would be unreasonable given the circumstances of a site, the DA process provides scope for council to consider a variation, provided it can be adequately justified on planning grounds.
That flexibility should not be treated as a starting point for a design. Councils are generally not inclined to support significant or unwarranted departures from the planning controls. A variation is far more likely to be accepted where it is minor, well justified, and genuinely responds to a site-specific constraint, rather than being a matter of preference.
Working within the applicable planning controls from the outset remains the more reliable approach and is far less likely to require a redesign during assessment. A compliant design is almost always the easier and faster path through Council, and it reserves any request for a variation for where it is genuinely warranted.
What documentation is required for a DA?
A DA is more than a set of architectural drawings. Depending on the scale and nature of the project, council will typically expect some combination of:
- Survey plan of the development site.
- Council DA forms, signed by the registered land owners and any other relevant parties.
- Estimated development cost, usually prepared by a qualified builder, or in some circumstances a Quantity Surveyor’s report.
- Waste management plan, detailing waste generation, storage and collection arrangements for both the demolition and construction works and the ongoing operational phase.
- Statement of Environmental Effects, explaining what is proposed, describing the site and its surroundings, and assessing the proposal against the relevant Council and State requirements. Where any part of the design does not strictly meet a control, this document needs to explain why that departure is still a reasonable outcome for the site.
- Architectural plans, and often shadow diagrams or landscape plans.
- Specialist reports where relevant, such as a Heritage Impact Statement, Stormwater Plan, BASIX Certificate, Flood Report, Traffic Report, or Arborist Report.
- Clause 4.6 variation request, if any part of the design does not strictly meet a numerical standard in the LEP, such as height or floor space ratio, and there is a planning argument for why it is acceptable.
Every Council in NSW has its own specific requirements for what must be submitted with a Development Application, and these vary depending on the type of development and the Council area. Before preparing your DA, review the relevant submission requirements guide, which is typically available on the council’s website. It sets out exactly what documents, reports and information are required and is the best starting point before lodgement.
Missing or incomplete documentation at lodgement is one of the most common and most avoidable causes of delay. If a DA is lodged without all required supporting documents, Council will typically return the application as incomplete or issue a formal Request for Information (RFI) shortly after lodgement, requiring the missing information before assessment can begin. This adds time, and in some cases attracts additional fees or requires the application to be re-lodged entirely.
In recent years Councils across NSW have tightened their approach to lodgement requirements, driven largely by the NSW Government’s increased focus on assessment timeframes and Ministerial expectations around timely determination. In response, many Councils now refuse to accept applications that do not include all required documentation upfront, rather than allowing incomplete applications to enter the assessment queue.
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What happens after I lodge my DA?
Once the documentation is prepared, the DA is submitted through the NSW Planning Portal, the centralised online platform used by all councils across NSW. Council carries out an initial administrative check to confirm all required documents have been provided and issues an invoice for application fees. If the application is accepted as complete it is formally lodged and allocated to an assessment officer, at which point the statutory assessment clock begins.
During assessment the DA is typically placed on public notification, allowing neighbouring landowners and the broader community to make submissions in support of or objection to the proposal. The notification period is generally between 14 and 28 days depending on the nature and scale of the development. Where objections are received, the assessing officer must consider the issues raised and address them in the assessment report.
The application may also be referred to internal council departments such as engineering, heritage, ecology, traffic and waste, and in some cases to external agencies such as Transport for NSW, NSW Heritage, the Rural Fire Service, Water NSW or Ausgrid.
The assessment process rarely proceeds in a perfectly linear fashion. RFIs are commonly issued where the assessing officer identifies gaps in the documentation or requires design changes. Where Council issues an RFI, the applicant is typically given between 7 and 21 days to respond, depending on the council and the nature of the request. Failing to respond within the timeframe, or providing an inadequate response, can have serious consequences, including the application needing to be withdrawn and re-lodged, or proceeding to refusal.
Following completion of the assessment, the referrals and any RFIs, the assessing officer prepares a report recommending either approval or refusal. Smaller and straightforward applications are typically determined by Council. More complex or contentious applications may be referred to the Local Planning Panel where they meet the relevant thresholds. Once a decision is made, a Notice of Determination is issued to the applicant on the NSW Planning Portal, confirming whether consent has been granted or refused and setting out any conditions of consent.
How long does a DA take in NSW?
Timeframes vary considerably depending on the council, the complexity of the project, and whether objections or external referrals are involved. A straightforward residential alteration at a council with a reasonably efficient assessment team might be determined in a few months. A more complex application involving site constraints, multiple referrals or a panel determination can take more than 6 months.
My DA has been determined. What happens next?
Council will issue a Notice of Determination confirming whether your application has been approved or refused.
If approved, the notice includes a set of conditions of consent that must be complied with before, during and after construction. Read these carefully, as they govern how the development must be carried out and what must be done before work can commence.
Before any construction can begin, a Construction Certificate (CC) must be obtained. The Notice of Determination details the conditions and requirements that must be satisfied to obtain a CC. Before a CC can be issued, a Principal Certifier must be appointed and an application lodged through the NSW Planning Portal. The Principal Certifier oversees the construction process, carries out mandatory inspections, and ultimately issues the Occupation Certificate (OC) on completion. This role can be undertaken by Council or an accredited private certifier. Appointing your Principal Certifier early is recommended, as they can help identify construction certificate requirements and reduce delays later.
Once construction is underway, inspections are required at various stages to confirm the works are being carried out in accordance with the approved plans and conditions of consent. On completion, an OC must be obtained before the building can be occupied or the new use commenced.
Where a DA is refused, the applicant has two main options: lodge a Section 8.2 Review Application with Council requesting a reassessment of the decision, or appeal to the NSW Land and Environment Court. Both pathways must be pursued within 6 months of the date of determination, so it is important to act promptly if you intend to challenge a refusal.
Where do most DA applications go wrong?
Most of the delays, RFIs and refusals we see come back to a short list of recurring errors. Designing before checking the site constraints, leaving specialist reports until the plans are locked in, assuming existing structures were approved, and treating a variation as a starting point rather than a last resort. We have set these out in detail in a separate article on the 10 most common DA mistakes and how to avoid them.
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