s 12 Considerations
21 Addressing the matters in s 12 which the Court is required to consider:
(a) The trees are located close to the boundary of the Hansens' land, and overhang that land.
(b) Local Council consent would ordinarily be required to interfere with the trees. We do not know if Ms Hetherington has applied for consent to prune or remove any of the trees.
(c) We have not been advised that the trees have historical, cultural, social or scientific value. As the trees appear to be common exotic species, were not planted by Mrs Hetherington, and are likely to be less than 40 years old, we find that they do not have any of those values.
(d) The trees are likely to make only a small contribution to the local ecosystem, through provision of food, shelter and nesting sites for some species.
(e) The trees make some contribution to the natural landscape and scenic value of the property and the locality by providing a large mass of vegetation, but the large size of the trees is out of scale with the adjacent houses and properties, and their type is not complementary to the adjacent national park bushland.
(f) The trees contribute to public amenity by providing intrinsic value through oxygen production, carbon sequestration, cooling summer shade, reduction of stormwater runoff, and deflection and dispersal of strong winds.
(g) The roots of the trees are likely to help stabilise nearby soil, but are causing damage to the Hansens' driveway and may in time damage retaining walls on Ms Hetherington's property.
(h) Damage
(i) & (ii) Ms Hetherington says that Mrs Hansen's mother laid the driveway pavers herself in 1992. Mrs Hansen says there was some gravel on the driveway prior to her mother laying the pavers on a sand base. Mr Hansen says that he re-laid the pavers about three years ago. Working with a licensed paving contractor, he lifted the pavers, cut out tree roots to about 50 mm deep, and re-laid the pavers with additional sand where necessary. He says that he was advised not to provide any other base, and did not compact the soil under the bedding sand. We observed some small roots up to about 30 mm diameter in the sand and soil under the paving at the three locations where pavers were lifted for inspection. We consider that the normal specification for such a residential driveway would include at least 100 mm depth of compacted road-base under the bedding sand, and a mortar edge sealing the bedding sand from tree root entry. We find that the under-engineering of the driveway is the major reason why tree roots have caused damage.
We also note that the Hansens did not give Ms Hetherington notice of damage to the driveway except in their application to the Court. We also observed that there are some small trees on the Hansens' land immediately adjacent the driveway, and some larger Gum trees further away, all of which may have or may in the future contribute to damage of the driveway. For these reasons we do not find that Ms Hetherington should pay compensation for repair of the Hansens' driveway, or pay for any works to prune or control tree roots growing under or near the Hansens' driveway.