Benefits of Trees: The Case for Retention on Your NSW Project

Retention is usually better than removal

The default DA conversation about a tree on a development site is often framed as a problem to solve – the tree is in the way. From an arboricultural-consulting perspective, this framing usually leads to worse outcomes than it needs to. A well-placed mature tree is an asset of the site, not an obstruction. Retaining it normally costs less, delivers more, and aids the DA approval more than removing it.

Three categories of benefit drive the case:

1. Economic benefits

A mature tree in a NSW residential setting carries amenity value of $5,000-$50,000+ under STEM valuation. This is value attached to the property – it transfers on sale, factors into insurance, and contributes to capital value. Removing the tree extinguishes that value.

Additionally:

• Energy bills: a shade tree on the western aspect of a NSW dwelling reduces summer cooling demand by 10-20%.
• Council bonds: retained trees attract tree-protection bonds rather than removal compensation, with bond release recovering the money.
• Council compensation savings: unauthorised removal can attract council compensation orders of $5,000-$50,000+ per mature tree replaced.
• Sale value: properties with established trees consistently sell at a premium in established Sydney suburbs.

2. Environmental benefits

A single mature urban tree typically:

• Sequesters 20-100 kg of CO2 per year
• Filters airborne particulate pollution and produces oxygen for ~4 people per tree per year
• Reduces local temperature by 2-4°C through evapotranspiration
• Provides habitat for native birds, microbats and (in larger or older trees) hollow-dependent fauna
• Intercepts and slows rainfall, reducing stormwater peak flows

Multiply those benefits across an established urban canopy and the cumulative effect on urban liveability is significant. Most NSW councils now have a tree-canopy-target policy (often 30-40% canopy cover by 2030 or 2050) and assess DAs that propose mature-tree removal against the policy.

3. Planning approval and design

Counter-intuitively, retaining a tree often makes a DA easier, not harder. Council assesses each removal against retention. A design that retains all (or most) mature trees on site has nothing to defend at DA. A design that removes a high-value mature tree has to:

• Document the necessity (why this design cannot retain the tree)
• Provide a like-for-like replacement schedule (often multiple replacement trees per removed tree, at upgraded pot sizes)
• Survive the assessment officer's scepticism about whether the design could have shifted to retain

An AIA that demonstrates retention with managed encroachment under AS 4970-2025 (Minor or Moderate tier with appropriate mitigation) is a much easier sell to council than a removal-justification AIA. Designing around trees from the start is cheaper than removing them later.

When retention is genuinely not viable

Sometimes retention is not the right answer. Common cases:

• The tree is in poor health or hazardous (TRAQ assessment shows Moderate, High or Extreme risk that mitigation cannot bring to acceptable levels)
• The tree is a declared weed species (camphor laurel, willow, privet) on a site where the council DCP supports removal of weed-species trees
• The tree's Tree Protection Zone covers the only buildable area of the site and the design cannot shift
• The tree has fundamental species mismatch with the site (incompatible species in a high-amenity context, like a Cocos palm where a feature canopy tree should be)

In these cases removal with appropriate replacement plantings is the right call. The replacement schedule, generated by our Replacement Planting Calculator, anchors the council conversation.

How to retain trees on a NSW project

1. Commission a Preliminary Arboricultural Report (PAR) at concept stage. Identifies which trees are on site, their value, retention priority, and the constraint footprint each imposes on the design.
2. Use the PAR to inform building footprint, services routing and access. Half a metre of shift in a slab edge can often drop a tree from Major to Minor encroachment.
3. Commission the AIA at DA stage with the design locked in. The AIA quantifies each retained tree's encroachment per AS 4970-2025 and prescribes mitigation.
4. Engage a Project Arborist for construction-stage supervision. The retained trees survive construction because someone qualified is on site monthly checking that protection is being maintained.

The total arborist cost across all four steps is typically $5,000-$15,000 + GST for a NSW residential project. The value of the retained trees, plus the avoided council compensation, plus the easier DA approval, almost always more than recovers that cost.

Frequently asked questions