PlanSA Urban Tree Canopy Off-set Scheme: Assessing On-Site Planting vs Paying Offsets in Adelaide Infill

Tree Canopy Requirements in Greater Adelaide Infill

Under South Australia’s Planning and Design Code, residential infill projects in Greater Adelaide face tree-related requirements aimed at preserving and enhancing urban tree canopy cover. In addition to controls on existing mature trees, new land divisions and dwelling applications frequently fall within the Urban Tree Canopy Overlay. This overlay seeks to increase canopy cover by requiring designated trees to be planted or retained on site or, in designated areas, by allowing a contribution to the statutory Urban Tree Canopy Off-set Scheme established under the Planning, Development and Infrastructure Act 2016. For property developers, builders and landowners, understanding how the scheme works and what it costs is important when balancing site yield against compliance costs.

Distinguishing Between Tree Removal and Infill Canopy Requirements

A frequent point of confusion during project feasibility is conflating the removal of existing protected trees with the planting requirements that apply to new dwellings:

• Regulated and Significant Tree Protections: This system addresses mature trees already growing on the land. Under the reforms that took effect on 16 May 2024, the trunk circumference threshold is 1.0 metre for regulated trees (previously 2.0 metres) and 2.0 metres for significant trees (previously 3.0 metres), and the exemption distance for trees near dwellings and swimming pools was reduced from 10 metres to 3 metres (certain species are not exempt even within 3 metres). The reforms also raised the fees for removing protected trees: from $326 to $1,000 for a regulated tree and from $489 to $1,500 for a significant tree. These are the May 2024 amounts and may change with the financial year, so current official figures should be checked.

• The Urban Tree Canopy Overlay: This overlay applies to new dwellings and sets requirements for future canopy. Depending on site area, the overlay specifies the number and size of trees to be planted or retained (small, medium or large; the larger the site, the greater the requirement), with adequate soil area reserved for each tree. In designated zones or soil-type areas specified in the Code, an applicant may elect to pay a contribution into the Urban Tree Canopy Off-set Fund instead of planting on site. The payment is not mandatory: the applicant may choose to plant, to pay, or to do a combination of both. For 2026–27 the off-set rates are $533 for a small tree (about 4 m mature height), $1,065 for a medium tree (about 6 m) and $1,598 for a large tree (about 12 m), and the amounts are adjusted from year to year.

Evaluating the Trade-offs: Planting On-Site vs Paying the Offset

During the design phase, project teams face a practical assessment: adapt the architectural footprint to retain soil area for living trees, or, where the scheme applies, pay the off-set contribution.

1. Spatial Constraints and Buildable Footprints

On compact infill allotments, reserving unpaved soil area with sufficient clearance from footings can significantly constrain architectural design. Trees need root zones that are kept clear of concrete slabs, retaining walls, stormwater pipelines and driveway crossovers. Fitting a medium or large tree onto a tight lot can reduce the usability of private open space (POS) or reduce the ground-floor living footprint, which affects the final floor area and market appeal.

2. Direct Financial Costs and Handover Risks

Choosing to plant on site incurs direct costs for nursery stock, planting, soil preparation and irrigation during establishment. If a condition of consent requires the tree to be planted, and to survive, before completion or occupation, a tree that fails to establish or is damaged during construction can create compliance risk and delay handover. Conversely, where the scheme applies, paying into the fund can give more design flexibility and reduce the risk of conflict between tree roots and underground infrastructure, though it is an upfront cash outlay that must be included in the initial feasibility model.

Prudent Steps for Developers and Landowners

Because the off-set scheme does not apply in every location, development teams should adopt a structured diligence process:

• Confirm Scheme Applicability: Check the South Australian Property and Planning Atlas (SAPPA) to confirm that the site sits within the Urban Tree Canopy Overlay, then confirm whether it falls within the designated zones or soil-type areas to which the off-set scheme applies. The scheme only applies to proposed dwellings in designated areas; where it applies, the choice to pay is the applicant’s.

• Coordinate Sub-Surface Infrastructure Early: Civil design drawings, including SA Water mains, stormwater infiltration and electrical service trenches, should be integrated with planting soil areas at concept stage to avoid costly redesign during building assessment.

• Monitor Policy and Fee Adjustments: Tree-related fees and off-set amounts are adjusted from year to year. In calculating residual land value, confirm the rates for the current financial year with your planning consultant or the council and allow a prudent compliance budget.

Sources

• Urban tree canopy off-set scheme | PlanSA

• Fact Sheet — Urban Tree Canopy Off-set Scheme | PlanSA

• New rules to protect Adelaide’s tree canopy coming into effect immediately | State Planning Commission

Illustrative image only — not a photograph of a Cyberate PM project. Photo by ANTONI SHKRABA production on Pexels.