Answer first: For a typical Sydney homeowner renovation, extension or new dwelling, start with whether the work is exempt under the Codes SEPP. If not, check whether a Complying Development Certificate (CDC) under the Housing Code (or Housing Pattern Book pathway) can fit. If site constraints, heritage, overlays or design standards knock you out of the codes, a Development Application (DA) to council is usually the safe route.

Author: Franz Phan, Senior Planning Consultant, giantA Pty Ltd · Updated September 2026

Choosing the wrong pathway wastes months and redesign fees. This guide compares exempt development, CDC and DA for NSW residential projects in 2026, with links to the Codes SEPP, Planning Portal timing, and the practical checks we run before drawing a line on a site plan.

Exempt vs CDC vs DA at a glance

Pathway	Approval needed?	Who assesses	Typical timing
Exempt development	No development consent or CDC if the work meets the Codes SEPP standards and land requirements	Self-assessed against the Codes SEPP (you remain responsible for compliance)	No planning approval clock — but building, plumbing and other licences may still apply
Complying Development Certificate (CDC)	Yes — a CDC combines planning approval and construction certification for code-compliant work	Council or a registered certifier against the relevant code (e.g. Housing Code)	NSW Planning Portal notes approvals in as little as 20 days; 10 days for the Housing Pattern Book CDC pathway
Development Application (DA)	Yes — development consent from the consent authority (usually council)	Merit-based assessment against the LEP, DCP, SEPPs and site-specific issues	Varies by council, complexity, referrals and exhibition — do not treat any “average days” figure as a guarantee

Primary sources:

Policy note (2026): NSW Government exhibited proposed CDC variations / Codes SEPP changes from 14 May to 24 June 2026. As of the Planning Portal page updated 25/06/2026, feedback was under review. Treat those proposals as proposed, not yet final law, until the instrument is made and in force.

What is exempt development in NSW?

Exempt development is minor work that, if it meets every standard in the Codes SEPP for that development type and the land is not excluded, can proceed without a development consent or a CDC. Typical homeowner examples (always check the current clause for your exact works) include certain fences, sheds, decks, pergolas, driveways and internal alterations — but only when size, height, setback and land criteria are met.

Exempt does not mean “anything small”. It means “specifically listed and fully compliant”. If one standard fails — height, floor area, setback, tree removal, or a land exclusion — the work is no longer exempt. You then move to CDC or DA.

Practical due diligence before you treat anything as exempt:

Confirm the exact development type and standards in the Codes SEPP.
Obtain a current Section 10.7 planning certificate and read land constraints (heritage, bushfire, flood, coastal, contamination notes).
Check covenants, easements and strata by-laws on title — codes do not override private restrictions.
Remember building work may still need a licensed builder, plumbing/drainage approvals, and NCC compliance even when planning approval is not required.

What is a Complying Development Certificate (CDC) and the Housing Code?

A CDC is a fast-track approval for development that complies with predetermined standards in a code (commonly the Housing Code under the Codes SEPP). Unlike a DA, there is no merit assessment of “is this a good design for this street?” — the certifier checks whether the proposal meets the numeric and mapped standards. If it does, a CDC can be issued; if it does not, the pathway fails and you redesign or lodge a DA.

The Housing Code covers many new dwellings, alterations and additions, and related residential works on suitable land. The NSW Planning Portal’s complying development page notes that approvals can be as little as 20 days, with a 10-day pathway for Housing Pattern Book CDC applications. See our related guide: NSW Housing Pattern Book 2026 — how pre-approved designs can cut approval time to 10 days.

A CDC typically covers both the planning approval and construction certification for the complying work (subject to the certificate conditions). That is why documentation quality matters: incomplete plans, missing site analysis or wrong overlays are common reasons certifiers refuse or request amendments.

Useful official reading:

When is a Development Application (DA) required?

A DA is required when the development needs consent under the Environmental Planning and Assessment Act framework and is not exempt and not complying development. Common residential triggers include:

the design exceeds Housing Code (or other code) standards — height, floor space, setbacks, landscaped area, private open space, car parking;
the land is excluded from complying development (heritage item or conservation area, certain flood or bushfire situations subject to the code clauses, mapped exclusions, and other Schedule / clause land bars);
the proposal relies on variation or “merit” judgement that a certifier cannot grant under the code;
council’s LEP requires consent for that use or works, and no SEPP pathway applies.

DA assessment is merit-based. Council (or another consent authority) weighs the LEP, DCP, relevant SEPPs, site constraints, and often neighbour submissions. Timeframes vary by council and complexity — referrals, design amendments and exhibition can extend the process. For complex sites, a well-prepared pre-DA / pre-lodgement meeting often saves redesign cycles later.

Which site constraints knock you out of CDC?

This is where many homeowners lose months: they design for CDC, then discover a mapped or clause-based exclusion. Always verify against the current Codes SEPP and your Section 10.7 certificate — do not rely on informal “the neighbour got CDC” stories.

Frequent knock-outs (illustrative — confirm the exact clause for your lot):

Heritage: items and many heritage conservation areas are excluded from complying development pathways that would otherwise apply.
Flood and bushfire: some flood-prone or bushfire-prone land remains eligible only if specific code standards are met; other situations are excluded. Read the relevant Housing Code / codes clauses carefully rather than assuming a blanket ban or blanket approval.
Schedule 5 and other mapped exclusions: land identified on certain planning maps (for example environmentally sensitive or other Schedule 5-style exclusions under the Codes SEPP framework) can remove CDC eligibility.
Covenants and easements: a CDC does not override a restrictive covenant that prohibits the works; easements for services, drainage or access can make a code-compliant envelope impossible.
Lot size, zoning and frontage: Housing Code pathways have land requirements — wrong zone, too-small lot, or non-compliant frontage can fail the pathway before design starts.
Existing unauthorised works: CDC is for proposed complying work. Regularising unlawful existing structures is a different problem — see our Building Information Certificate NSW 2026 guide.

Start due diligence with a current Section 10.7 planning certificate, title search, and a site survey. Overlay that against the Codes SEPP land requirements before you freeze the floor plan.

Documents checklist: what to prepare for each pathway

Exact document lists depend on the code clause, certifier, and council. As a practitioner baseline:

Exempt (self-check pack)

Marked-up plans showing the works meet every numeric standard for that exempt type
Section 10.7 certificate and confirmation the land is not excluded
Title search for covenants/easements
Builder licence / trade compliance as applicable; NCC and BASIX where triggered

CDC (Housing Code / Pattern Book style)

Site plan, floor plans, elevations and sections to code standards
Site analysis addressing setbacks, height, landscaped area, private open space, parking
BASIX certificate and NatHERS outputs where required
Stormwater concept, bushfire BAL assessment, flood advice or other specialist reports if the code or site demands them
Owner consent, title documents, and any Pattern Book nomination documents if using that pathway

DA

Full architectural set and statement of environmental effects (or equivalent council form)
Survey, shadow diagrams, landscape concept, and specialist reports (heritage, flood, bushfire, traffic, acoustic) as required by the LEP/DCP checklist
BASIX / sustainability documentation where the development type triggers it
Notification plans and any pre-lodgement meeting notes

For renovations, confirm whether alterations and additions trigger BASIX — see BASIX for alterations and additions in NSW 2026.

Does CDC require neighbour notification?

Complying development is designed as a standards-based pathway. Neighbour notification and exhibition rules for CDC differ from a typical DA. Some CDC types still involve notice to neighbours or specified persons under the Codes SEPP or EP&A Regulation settings for that development class — but CDC is not a full merit exhibition in the DA sense.

Practically: do not assume “CDC means silent approval with no neighbour process”. Read the notice requirements for your specific development type, and design courteously for privacy, overlooking and stormwater even when merit assessment is not the test. For DA, expect formal notification/exhibition under the council’s community participation arrangements.

Do BASIX and the NCC still apply if the pathway is exempt or CDC?

Yes where the development type triggers them. Pathway choice (exempt / CDC / DA) does not waive sustainability or building-code obligations.

BASIX: required for many new dwellings and for alterations and additions above threshold criteria. Certificate numbers must appear on approval documentation as required.
National Construction Code (NCC): building work must still meet applicable NCC performance or deemed-to-satisfy provisions, whether or not planning consent was needed.
Other licences: plumbing, electrical, waterproofing and owner-builder obligations continue to apply under their own regimes.

Skipping BASIX because “it is only a small extension” is a classic refusal or certificate delay. Check the current SEPP BASIX thresholds for your cost and works scope.

Common mistakes when choosing exempt, CDC or DA

Designing first, checking codes later — floor plans that blow setbacks or height force a late DA pivot.
Ignoring Section 10.7 and overlays — flood, bushfire, heritage and Schedule-style map exclusions are pathway killers.
Treating neighbour “CDC success” as precedent — different lot size, slope, easements or heritage listings change eligibility.
Assuming exempt means no documents — you still need proof of compliance if challenged; keep a self-assessment pack.
Using CDC to “fix” unauthorised existing works — CDC is prospective; BIC/DA strategies differ.
Under-documenting for a private certifier — incomplete plans are rejected; code pathways are strict, not informal.
Forgetting covenants — private restrictions can block works even when the planning pathway is open.
Relying on proposed 2026 Codes SEPP reforms as if already in force — exhibition closed mid-2026; until made, design to the current instrument.

How giantA helps you choose the right pathway

At giantA Pty Ltd we start with due diligence, not pretty pictures. For Sydney and NSW residential projects we typically:

review your Section 10.7 certificate, title, survey and site constraints against the Codes SEPP;
test whether a Housing Code or Pattern Book CDC envelope is realistic before concept design locks in;
flag early if DA (and possibly a pre-lodgement meeting) is the safer commercial path;
prepare documentation packages for CDC lodgement or DA lodgement, including BASIX coordination;
advise when unauthorised existing works need a BIC strategy instead of a “retrospective CDC”.

We document residential renovations, extensions, dual occupancy, granny flats and new dwellings across Greater Sydney — focusing on approvals-ready drawing sets, not aesthetics-only concepts.

FAQ: Exempt development, CDC and DA in NSW

Is a granny flat usually CDC or DA in NSW?

Many secondary dwellings can proceed as complying development where the Codes SEPP and land requirements are met, but heritage, flood/bushfire constraints, lot criteria or design non-compliance can force a DA. Confirm the current secondary dwelling / Housing Code provisions for your lot before assuming CDC.

How long does a CDC take compared with a DA?

The NSW Planning Portal states complying development approvals can be as little as 20 days, and 10 days for the Housing Pattern Book CDC pathway. DA timing is merit-based and varies by council, complexity, referrals and exhibition — avoid budgeting against a single statewide “average days” figure.

Can I get a CDC if my house is in a heritage conservation area?

Often no for pathways that exclude heritage conservation areas or listed items. Some limited works may still have other pathways, but do not assume Housing Code CDC is available. Check the Codes SEPP land requirements and your Section 10.7 certificate.

Do I need neighbour approval for CDC?

CDC is standards-based, not a neighbour veto. Some development types require notice under the applicable rules, but that is not the same as DA exhibition and objection-driven merit assessment. Always check the notice requirements for your CDC type.

What if my builder says the work is “exempt”?

Ask them to cite the exact Codes SEPP clause and show how every standard and land requirement is met. If any standard fails, it is not exempt. Keep written evidence; owners remain responsible for unlawful works.

Are proposed May–June 2026 Codes SEPP / CDC changes already law?

No. NSW Government exhibited proposed CDC variations / Codes SEPP changes from 14 May to 24 June 2026; as of the Planning Portal update on 25/06/2026, feedback was under review. Design and lodge under the instrument currently in force until changes are made.

Should I get a Section 10.7 certificate before choosing a pathway?

Yes. A Section 10.7 planning certificate is the standard starting point for zoning and constraint information that affects exempt/CDC eligibility and DA strategy. See our complete Section 10.7 guide.

Ready to choose the right pathway? Contact giantA.com.au for design and approvals documentation on renovations, extensions and new dwellings in Sydney and NSW. We will map exempt vs CDC vs DA against your site constraints before you commit to a floor plan.

This article is general information for NSW homeowners and designers. It is not legal advice. Confirm the current Codes SEPP, Housing Code standards, Planning Portal requirements and your council’s DA checklists before acting. Proposed 2026 policy reforms should be treated as proposed until made and in force.

Exempt Development vs CDC vs DA NSW 2026: Which Approval Pathway Fits Your Project