Beyond CAVAT: What a new Australian case tells us about the real value of trees

When a tree is unlawfully felled, one of the hardest legal questions is deceptively simple: what has actually been lost?

Is the loss measured by the cost of buying and planting another tree? By the reduction in the value of the land? By the amenity the tree provided? By its ecological function, its habitat value, its landscape contribution, or by the decades it may take before any replacement begins to perform the same role?

Those questions arise repeatedly in tree disputes in the UK. They also sit behind valuation systems such as CAVAT, which seek to express the public amenity value of trees in financial terms. A recent Australian judgment offers a particularly interesting perspective because the Court recognised very substantial tree-related loss without trying to convert that loss into one capital figure.

The case: 287 trees removed from Sydney Harbour bushland

The decision is Lane Cove Council v Yi Wang [2026] NSWLEC 96, handed down by Pepper J in the Land and Environment Court of New South Wales on 6 August 2026. The defendant, Yi Wang, pleaded guilty to three environmental and planning offences arising from the unlawful clearing of vegetation at Longueville on Sydney Harbour.

The affected land comprised Council-owned waterfront land, part of a road reserve and part of Griffith Park beside a residential property. Wang had initially been engaged to undertake grass-trimming work. He was subsequently asked to assist with cutting trees on the neighbouring land. He said that he could not personally cut the trees and referred the cutting work to another person, Yuxing “Jacky” Liang, who used a chainsaw. Wang remained involved in the operation by recruiting labourers, clearing and transporting branches and foliage, coordinating the work and reporting progress. The clearing took place over 12 days in November 2023. By the time it ended, 287 individual trees had been removed and approximately 1,210 square metres of land had been cleared. No relevant approval, permit or development consent had been obtained.

The offending gave rise to three overlapping offences. One concerned 32 trees within a Biodiversity Values Map area. Another concerned 255 trees removed without the required Council permit. The third related to disturbance of public bushland and encompassed the clearing operation as a whole.

Wang pleaded guilty at the earliest opportunity. The Court ultimately imposed total monetary penalties of A$187,500, together with investigation costs of A$11,660, the Council’s legal costs and publication orders.

Did the Court value the trees at A$187,500?

No. That is the first and most important distinction to draw from the judgment.

The A$187,500 was a criminal penalty. Pepper J was conducting a sentencing exercise. Each offence carried a maximum Tier 2 penalty of A$500,000 for an individual. The Court considered objective seriousness, the scale of the works, the environmental harm, Wang’s state of mind and level of control, deterrence, comparable cases, personal circumstances, remorse, cooperation and the early guilty pleas.

The Court selected an initial penalty of A$150,000 for each offence, applied a 25 per cent discount for the early guilty pleas and then moderated two of the penalties under the totality principle because the three offences arose from substantially the same clearing operation. The final figures were A$112,500 for the Public Bushland offence, A$50,000 for the DCP Tree offence and A$25,000 for the Biodiversity Values Map offence.

The amount of the fine tells us about the criminal seriousness of the conduct; it does not tell us the capital value of the trees.

So how did the Court determine the value of the damage?

This is where the judgment becomes much more interesting from a tree-valuation perspective. The Court did not search for one number. It examined what the trees and vegetation were doing before they were removed and what had disappeared as a result of the clearing.

Arboricultural value – The Council’s arborist, Hugh Millington, prepared an arboricultural report and later a supplementary report. His evidence was that the removed trees were of “high arboricultural value”. That finding matters because it immediately moves the analysis away from the idea that the case was simply about an area of replaceable vegetation. The quality and significance of the individual trees formed part of the harm.

Ecological value – The ecological evidence went much further. Before the works, three native vegetation communities existed on the land: Coastal Sandstone Foreshores Forest, Estuarine Swamp Oak Forest and Mangrove Forest. The clearing affected all three. Part of the Swamp Oak Forest was an endangered ecological community, and the evidence established that the works produced significant ecological consequences for the local occurrence of that community.

That is an important conceptual step. The Court was not merely assessing 287 separate tree stems. It was assessing the destruction of components of an established vegetation community. In other words, the trees had value not only as individual specimens but also because of the ecological system of which they formed part.

Habitat and fauna – The judgment also examines the habitat function of the vegetation. The affected land provided protection, foraging habitat, roosting habitat and nesting habitat. The evidence considered birds, microbats and possums, together with threatened fauna including the Large Bent-wing Bat, Little Bent-wing Bat, Southern Myotis and Powerful Owl.

The Court accepted that the clearing reduced the suitability of the land for those species and caused actual environmental harm through exposure, predation, competition and displacement. Dense regeneration would itself be less suitable for some species for a substantial period. For example, the judgment records that the structure of the regrowth would restrict microbat foraging until the vegetation began to self-thin.

Time as part of the loss – Perhaps the most significant feature of the judgment for UK tree lawyers is the Court’s treatment of time.
The Court accepted that regeneration to an ecological condition comparable with the pre-clearing condition would take 20 to 30 years. The native forest canopy removed by the works had persisted on the land since at least 1943. During the regeneration period, the regrowth would be susceptible to pathogens and weeds, and there was evidence of a risk that its physical attachment would be weaker than the previous vegetation. Millington also considered that the works had caused some reduction in the Safe Useful Life Expectancy of the regrowth.
That gets to the heart of a recurring problem in tree valuation. A mature tree is not necessarily “replaced” because another tree is planted in the same place. The physical act of planting can happen in a day; replacement of canopy, landscape effect, habitat function and maturity may take decades.

In Wang, that temporal deficit was not an abstract point. It formed part of the evidence demonstrating the seriousness of the environmental harm. The Court was effectively recognising that the loss persisted during the period in which the site could not perform the functions it had performed before the trees were removed.

Visual amenity – The damage was not confined to ecology. Pepper J expressly found that each offence caused “significant and actual harm to the visual amenity” of the Woodford Bay foreshore. That is particularly relevant to a UK audience because amenity sits at the centre of our own Tree Preservation Order regime. The New South Wales statutory framework itself also recognised broader values. The relevant provisions sought to protect the biodiversity values of trees and vegetation, preserve amenity, retain existing trees, increase canopy cover and promote the social, environmental and economic benefits of trees.

Damage beyond the trees – The vegetation also performed a protective function in relation to an Aboriginal shell midden on the land. The loss of vegetation greatly reduced the natural leaf-litter ground cover protecting that heritage feature, and the works were likely to have disturbed it. Again, the significance of the trees arose partly from their relationship with something else in the landscape.

Taken together, the evidence enabled the Court to conclude that each of the offences caused substantial harm. That harm was an aggravating feature of the offending.

This is not really “tree valuation” in the conventional sense

There was no CAVAT calculation. There was no Helliwell valuation. There was no depreciated replacement-cost exercise and no attempt to calculate the diminution in value of a property. The Court did not decide that the trees were worth a particular sum of money.
Instead, the judgment answers a slightly different question: how serious was the damage caused by their removal?

The answer was constructed from several components. The trees had arboricultural quality. Together they formed vegetation communities. Those communities provided habitat. The canopy contributed to visual amenity. The vegetation protected a heritage asset. The site had developed over many decades, and comparable ecological recovery would itself take decades. That makes Wang useful because it illustrates a distinction which can be lost in valuation disputes: value and price are not necessarily the same thing.

Would an English court look at tree damage in the same way?

Not automatically, and we need to be careful about the comparison. Wang is an Australian sentencing decision under New South Wales environmental and planning legislation. It is not binding in England and Wales. More importantly, sentencing for an environmental offence is a different legal exercise from assessing compensatory damages in a civil claim. However, the underlying concepts are similar to English tree law. The English Government’s guidance on Tree Preservation Orders describes a TPO as a mechanism for protecting trees, groups of trees and woodlands in the interests of amenity. In considering whether protection is justified, local planning authorities can look at individual and collective impact and, where relevant, broader factors such as nature conservation and climate change. The guidance on offences also recognises that destruction is not confined to physically obliterating a tree; the legal concept of destruction can engage where a tree has been rendered useless as an amenity or as something worth preserving.

That language already recognises that the legal significance of a tree may extend well beyond its timber value, its nursery price or the amount somebody would pay to buy the land on which it stands.

Where does CAVAT fit?

In the UK, CAVAT, the Capital Asset Value for Amenity Trees, provides a methodology for expressing amenity trees as capital assets. CAVAT can be extremely valuable precisely because a mature tree may contribute far more to a place than the cost of purchasing a young replacement. It gives public authorities and other decision-makers a structured financial language for discussing an asset which would otherwise be difficult to put on a balance sheet. But Wang prompts a useful question, even where we can produce an amenity valuation, does that figure necessarily describe everything that has been lost?

The Australian judgment examined functions that are not easily collapsed into one number: ecological community, habitat structure, visual amenity, heritage protection and, crucially, the time required before the site can once again perform comparable functions. It is therefore better understood not as a competing valuation method, but as a reminder that tree damage can be multi-dimensional. The distinction can already be seen in UK prosecutions.

A useful English comparison comes from a 2025 prosecution by Maldon District Council. Six TPO-protected trees were unlawfully felled. The Magistrates’ Court heard that their combined CAVAT value was estimated at £197,015. The defendant was fined £2,533, with surcharge and costs taking the total financial liability to £5,315.99. That example makes the same basic point from the opposite direction. The CAVAT figure was evidence about the value of the trees; the fine was punishment for the offence. They were not expected to be the same number.

Wang suggests that prosecutors and local authorities may also benefit from placing before a sentencing court a richer evidential account of the damage including

• the maturity of the lost canopy,
• habitat function,
• ecological connectivity,
• species affected,
• landscape and visual amenity,
• heritage context and
• the length of time required for meaningful recovery.

In the appropriate case, that may communicate the seriousness of the harm more effectively than a valuation figure on its own.

Could Wang influence similar UK claims?

Directly, probably not. It is a foreign criminal sentencing judgment applying different legislation. An English civil court is not going to treat Wang as authority for the measure of damages, and a UK TPO prosecution remains governed by the domestic statutory framework and domestic sentencing principles. Its potential influence is more subtle. For local authorities, the judgment is a strong example of how environmental harm can be evidenced rather than merely asserted. For arboricultural and ecological experts, it illustrates the value of describing function, context and recovery time rather than ending the analysis with species, dimensions, condition and a number. For civil litigators, it reinforces the need to distinguish between the physical replacement of a tree and genuine reinstatement of what the claimant has lost. Most importantly, it may help shift the discussion away from the assumption that there must always be one “correct” value for a tree.

Value is not the same as price

A mature tree can simultaneously have a replacement cost, an amenity value, an arboricultural value, an ecological function, a landscape value and a value to the property or community around it. Those concepts are not interchangeable. Some may be directly relevant to damages, some to sentencing, some to planning decisions and some to public-asset management. That is why the most striking feature of Wang is not the A$187,500 penalty. The judgment shows a court identifying substantial loss without pretending that the entire loss can be captured by one financial calculation.

The Court looked at what disappeared, mature and high-value trees, established vegetation communities, habitat, visual amenity, heritage protection and an ecological condition that would take another 20 to 30 years to recreate.

For UK tree law, that may be the real lesson. Valuation methodologies are useful because courts, insurers, landowners and public authorities often need numbers. But a number is an expression of value for a particular purpose; it is not necessarily a complete description of the loss.