Development Application (DA) Documents Explained

A development application (DA) is the formal request you submit to your local council to approve your building project — like a dual occupancy. To get council approval, you need to lodge the right paperwork.

Some documents are always required, while others are only needed depending on the site or type of work.

Here’s a clear breakdown:

Core Documents (Always Required)

Architectural Plans

Drawings of the design. Includes site analysis, floor plans, elevations, sections, shadow diagrams, and a schedule of colours and materials.

BASIX Certificate

Proves the development meets NSW standards for energy, water, and sustainability.

Landscape Plans

Shows proposed gardens, trees, paving, and outdoor areas.

Owner’s Consent

Written approval from the landowner to submit the DA.

Quantity Surveyor’s Report

Gives a cost estimate of the build. Used for fees, levies, and financial checks.

Statement of Environmental Effects (SEE)

Explains how the proposal complies with council rules and addresses environmental impacts.

Stormwater Plans

Details drainage and water run-off design. Shows how stormwater will be managed on the site.

Survey Plan

Prepared by a licensed surveyor. Shows boundaries, existing structures, and site levels.

Waste Management Plan

Outlines how construction waste and household rubbish will be stored, collected, and disposed of.

Additional Documents (May Be Required)

Depending on your land and design, council may ask for extra reports, such as:

• Arborist Report – if the works affect trees.

• Biodiversity Report – if native vegetation is cleared.

• Civil Plans – for steep driveways.

• Clause 4.6 Variation – if the design breaks a planning rule.

• Flood Management Plan – for flood-prone land.

• Geotechnical Report – if digging deeper than 2 metres.

• Heritage Impact Assessment – if in a heritage area.

• Noise Report – if near railways or main roads.

• Subdivision Plan – if Torrens or Strata subdivision is planned.

• Vegetation Management Plan – if the project affects bushland or waterways.

Why It Matters

Getting your documents right the first time saves weeks of delays. Councils won’t process incomplete applications. Working with professionals (architects, planners, surveyors) helps ensure all boxes are ticked.