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EP&A Act 1979 (NSW): the planning law every NSW builder works under

NSW residential builds run under the EP&A Act 1979: DA or CDC consent, CC before work, critical stage inspections, OC at the end. Parts 4, 6 and 7 explained.

By Dan Waring. Last updated 15 May 2026. Verified 15 May 2026.

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In plain English

The Environmental Planning and Assessment Act 1979 (NSW) is the head statute for the NSW planning and building approvals system. Every residential job in NSW that needs council or certifier consent runs under this Act, even if the words “EP&A Act” never appear on the contract. It does three things that matter to a builder:

  1. Sets the pathways for development consent (DA, CDC, exempt) and what each pathway requires (Part 4).
  2. Sets the certification framework (Construction Certificate before work; principal certifier appointed; critical stage inspections during the build; Occupation Certificate before move-in) (Part 6).
  3. Sets the enforcement powers that let councils, certifiers and the NSW Building Commission issue orders to stop work, fix defective work, or refuse the OC (Part 7).

The Act was substantially restructured by the Environmental Planning and Assessment Amendment Act 2017, with most provisions commencing 1 March 2018 (verified 2026-05-15 against NSW Department of Planning). The 2018 restructure introduced decimal numbering throughout, so old section references (e.g. “section 109H”) were replaced by new decimal references (e.g. “section 6.5”). On older contract templates or older judgments you will still see the old numbers; on current legislation, certifier paperwork and orders the decimal numbering is used.

What it requires

For a residential build, the practical chain set up by the Act:

  1. Consent pathway decided up-front (Part 4): the work is either exempt, a Complying Development Certificate (faster certifier pathway, ~20 days), or a full Development Application lodged with council (merit assessment, ~4 months median). The pathway is set by what the proposed work is and the LEP / DCP / SEPP controls on the land.
  2. Construction Certificate (CC) issued before any building work starts (Part 6). The CC certifies that the construction drawings comply with the development consent and the National Construction Code.
  3. Principal certifier (PC) appointed before site-start (Part 6). The PC is either a private certifier registered under the Act or the council. The PC’s role is independent inspection.
  4. Critical stage inspections carried out at the points set in the Part 6 regulations (six for Class 1a residential, listed in the EP&A (Development Certification and Fire Safety) Regulation 2021, s.61 (verified 2026-05-15)).
  5. Occupation Certificate (OC) issued before the building can be occupied or used. The PC will not issue the OC if any mandatory inspection was missed without satisfactory evidence (Part 6).

Enforcement: under Part 7, the PC, the council, and the NSW Building Commission can each issue orders requiring work to be uncovered, rectified, or stopped. The most consequential for a residential builder is a refusal of the OC, which prevents occupation and triggers the rectification process.

What it doesn’t cover

The Act sets the planning and approvals framework. It does not set:

  • Building technical standards. Those live in the National Construction Code (NCC) and the cited Australian Standards. The EP&A Act and its regulations require compliance with the NCC; they do not set the technical content.
  • Licensing of builders and trades. That lives in the Home Building Act 1989 (NSW) and the regulations under it, administered by NSW Fair Trading.
  • Work, health and safety. That lives in the Work Health and Safety Act 2011 (NSW) and is administered by SafeWork NSW.
  • Strata or community title schemes. Those live under the Strata Schemes Management Act 2015 (NSW) and related Acts.
  • Building product liability. That is contract law, the Design and Building Practitioners Act 2020 (NSW) for Class 2 buildings, the Home Building Act warranties for Class 1, and the Australian Consumer Law.

Read the Act for what it does: planning consent, certification, enforcement. Read the rest for the technical, licensing, and liability layers.

Practical implications

  • Every NSW Class 1a build is governed by the Act. Even a small alteration that does not need a DA still typically needs a CDC or sits under exempt development rules, and exempt development is itself a creature of the Act and the SEPP.
  • Old section references in contract templates need updating. If a contract refers to “section 109H” or other pre-March-2018 numbering and the dispute happens after 2018, courts apply the renumbered provisions. Older Practice Notes and judgments use the old numbers; the NSW Department of Planning new sections guide is the official cross-reference.
  • The certifier is independent of the builder. Under Part 6 the PC is appointed by the owner (commonly via the builder), but their statutory role is to certify compliance, not to manage the build. PC registration sits under the Building and Development Certifiers Act 2018 (NSW), administered by NSW Fair Trading (verified 2026-05-15). Trying to direct the PC’s findings is a regulated offence under the certifier framework.
  • Missed inspections cost the OC. Part 6 read with EP&A (Development Certification and Fire Safety) Regulation 2021 s.61 is the legal basis for the PC refusing OC if a critical stage inspection was skipped. The only path back is exposing the work and re-inspecting.
  • Enforcement orders are issued in writing under Part 7. A verbal “stop work” from a council officer is not yet a legal order; the written notice is the trigger. Always ask for the order in writing.

References

See also

Last updated: 2026-05-15. Verified: 2026-05-15. Quarterly review for currency.

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