Required Documents for Development Application: Residential Development – Dual Occupancy (Attached and Detached):
Applying for a Development Application (DA) for a dual occupancy project, whether attached (side-by-side or stacked) or detached (two separate dwellings on a single lot), requires submitting specific documentation.
These developments focus on creating two distinct residences on one property, with documents tailored to address how the dwellings integrate with the site, neighbouring properties, and local infrastructure.

Statement of Environmental Effects (SEE)
The Statement of Environmental Effects (SEE)Â is a key document assessing the impacts of the proposed dual occupancy on the surrounding community, environment and infrastructure.
For dual occupancies, this document should address the visual integration of both dwellings within the neighbourhood, potential impacts on privacy and shared access or amenities.
It must also outline measures to manage overshadowing, noise, or other disruptions, including landscaping or screening solutions to mitigate these effects.
Site Analysis and Layout Plan
The Site Analysis and Layout Plan outlines the property’s existing conditions and how both dwellings will be positioned.
It details boundary alignments, access points and natural features such as trees or slopes.
This plan is critical for ensuring that each dwelling maintains practical access, appropriate separation and complies with setback, open space and parking requirements while fitting cohesively into the neighbourhood.
Architectural Plans
Architectural Plans are essential for detailing the design, structure and layout of each dwelling.
These plans should include floor plans, elevations and sections, demonstrating how the two homes function independently while maintaining a unified aesthetic.
Councils assess these plans to ensure adherence to building standards, height restrictions, and neighbourhood character, particularly for attached dwellings with shared walls or design features.
Survey Plan
The Survey Plan provides precise measurements and identifies site constraints, such as legal boundaries, easements and existing structures.
For dual occupancy projects, this plan ensures the new dwellings comply with zoning regulations and setback requirements while avoiding boundary or access issues, helping to clarify the footprint of each residence.

Landscape Plan
The Landscape Plan demonstrates how outdoor areas will be developed to enhance both functionality and visual appeal.
For dual occupancy, this includes creating private outdoor spaces for each dwelling, selecting suitable plantings, and incorporating features like pathways or screens.
Councils review this plan to ensure it supports privacy, complements the streetscape and aligns with green space standards.

Stormwater and Drainage Management Plan
A Stormwater and Drainage Management Plan ensures that rainwater runoff is effectively managed for both dwellings.
It includes details on collection and disposal systems, such as rainwater tanks or drainage channels.
Councils assess this plan to ensure the infrastructure accommodates the additional hard surfaces created by the development without impacting neighbouring properties or local waterways.
Additional Documentation
Councils may request further reports based on the site’s unique characteristics or environmental considerations.
Privacy Impact Assessment:Â For designs that include large windows or balconies overlooking neighbouring properties, this report proposes solutions such as planting or screens to maintain privacy.
Acoustic Report:Â Required for shared-wall developments or noise-sensitive areas, this report suggests soundproofing measures like double glazing or insulation.
Bushfire Risk Assessment:Â For properties in bushfire-prone areas, this report evaluates fire risks and recommends safety measures, such as defensible spaces or fire-resistant materials.
Tree and Vegetation Assessment:Â This report assesses significant trees and advises on preservation or removal strategies while minimising impacts on the local ecosystem.
Geotechnical Report:Â For sloped or unstable sites, this report ensures both dwellings are safely constructed with appropriate foundations or retaining walls.
Flood Risk Assessment:Â In flood-prone areas, this report proposes mitigation measures such as elevated floor levels or improved drainage systems.
Heritage Impact Statement: For sites within heritage zones, this report evaluates how the project respects the area’s character and proposes adjustments to align with heritage values.
Environmental Sustainability Report: This report highlights eco-friendly features like solar panels, water-saving systems, or sustainable materials to demonstrate the project’s commitment to reducing its environmental footprint.
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