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DA Checklist NSW 2026: Every Document You Need Before Lodging a Development Application

Complete DA checklist NSW 2026. Statement of Environmental Effects, architectural plans, BASIX, fees ($3K–$15K) and the NSW Planning Portal steps. Save weeks of RFI delays.
August 13, 2026 by
DA Checklist NSW 2026: Every Document You Need Before Lodging a Development Application
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Real scenario: a 451 m² duplex site in Western Sydney, two-storey, R3 zoning. The owner lodged a DA without a proper SEE and got an RFI (Request for Information) three weeks in — adding six weeks to the timeline and a second round of consultant fees. Almost every DA problem we see at giantA starts the same way: lodge first, list documents later.

Use this checklist before you press submit on the NSW Planning Portal.

What documents are required for a DA in NSW (2026)?

Document · When required

**Statement of Environmental Effects (SEE)** · Always — the core of the DA

**Architectural plans** (site plan, floor, elevations, sections, shadow diagrams) · Always

**BASIX certificate** · All residential work over $50,000

**Survey plan (registered surveyor)** · Always

**Cost Summary Report / Registered Quantity Surveyor report** · If development cost ≥ threshold

** arborist / landscape, stormwater, acoustic, waste plans** · Project/council-specific

DA lodgement steps (NSW Planning Portal)

  • 1. Pre-lodgement — check LEP/DCP, get a council pre-DA if the site is complex.
  • 2. Prepare documents — plans + SEE + BASIX + supporting reports.
  • 3. Lodge online — upload to the Planning Portal, pay the council fees.
  • 4. Assessment — council reviews; respond to any RFI fast.
  • 5. Determination — consent issued, then Construction Certificate before work starts.

    • Source: `Your guide to the DA process` — NSW Planning.

    The 5 mistakes that trigger an RFI (and how to avoid them)

  • SEE written generically — cite the exact LEP clause + DCP control per control.
  • Missing BASIX on work over $50K.
  • Shadow diagrams that don't match the floor plan levels.
  • Inconsistent cost between the DA form and the QS/cost report.
  • Owner consent missing or signed by the wrong entity (company title vs strata).

    • What does a DA cost in 2026?

  • Council DA fees: ~$3,000 – $15,000 depending on development value.
  • Add consultant costs (architectural documentation, BASIX, SEE) on top.

    • FAQ

    How long does a DA take in NSW in 2026?

    Average ~70 days for a standard residential DA, longer if an RFI is issued — so the checklist matters.

    Do I need a SEE for a duplex?

    Yes. A duplex DA always requires a Statement of Environmental Effects addressing the LEP and DCP controls for that site.

    Can I lodge a DA before I have a BASIX certificate?

    No — BASIX is a mandatory attachment for residential DA over $50,000.

    Preparing a DA in Sydney NSW? giantA prepares DA documentation end-to-end — SEE, plans, BASIX — so you lodge once and move forward. Contact us.

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