The site inspection and hearing
12The respondent's tree is a semi-mature Spotted Gum ( Corymbia maculata) situated in the rear garden about 2 m from the common boundary between the properties. It is growing in a level lawn area adjacent to a small garden shed. I inspected the tree from the two properties. It is about 18 m in height with a trunk diameter of about 350 mm. The tree appeared healthy and I saw no evidence of instability or structural defects. The trunk bifurcates at about 8 m, forming two stems of similar proportions. The stem union has the form of a tension fork and I saw nothing to indicate weakness in that union. The secondary branch attachments appeared sound.
13The applicant's dwelling is a 'granny flat' situated at the rear of, and separate to the principal dwelling on the land. According to the applicant, the flat is about 35 years old. It is situated about 1.5 m from the boundary fence.
14I inspected tiling at the northeastern corner of the veranda, where it was evident that a section of about 1 sq m of tiles had sunk by about 10 mm. The applicant says that the tiles had previously lifted but were now sunken due to temporary excavation to investigate and re-lay them. I estimate this section of tiling is more than 8 m from the respondent's tree.
15The applicant says the tiling is at least 30 years old, but he first noticed tiles lifting about 2 years ago. He subsequently lifted and re-laid the damaged section. He contends that roots from the respondent's tree caused this damage, although he did not find any roots during the tile re-laying. He says he assumed that roots were the cause because it was about that time that he observed the respondent's tree had grown high enough to be seen above the roof of the dwelling. He says he had a tiling contractor inspect the damage and the contractor told him that roots were most probably the cause of the damage.
16The applicant says he decided not to repair the tiles as he relied on the contractor's advice and that there was no point in doing so as long as the tree remained.
17In the applicant's bathroom I observed a very slight undulation in the tiling surrounding the waste inlet in the centre of the room, and also a few small hairline cracks in the tiles surrounding the inlet. The applicant contends that tree roots caused this undulation and cracking. He said he had not lifted tiles or the drain to verify this allegation. The tiling and drain were also more than 30 years old.
18I observed the box guttering along the eastern side of the dwelling veranda and noted that it was in generally poor condition. The corrugated roof sheeting was in similar poor condition and lifted in places. This gutter is at least 8 m from the closest point of the respondent's tree. The applicant says he paid $300 to have the gutters cleaned out about a year ago and that no cleaning had occurred since.
19I observed the guttering along the western side of the building closest to the respondent's tree and noted that it was in relatively good condition.
20Mrs Isgro, for the respondent, submits that the applicant has had a grievance with the tree for a very long time and has made repeated requests to have the tree removed. She says the respondent has seen no reason to remove the tree, as, according to arborist reports that have been commissioned, the tree is healthy and does not present a threat or danger.
21Mrs Isgro's affidavit tendered in evidence, detailed two tree preservation order applications submitted by the respondent in 2007 and 2009 to Blacktown Council, seeking consent to remove the tree with the reason for removal being that the owner next door feels the tree is in danger of falling on his roof.
22In response to the 2007 application, Blacktown Council requested the submission of an arborist report pertaining to the condition of the tree.
23A report was prepared by Nepean Tree Service Pty Ltd on 31 July 2007. This report took the form of an extremely sparse one-page report produced on a Housing NSW proforma sheet. It described the tree in the following terms: "Spotted gum in rear yard is overhanging sheds on the property and apart from a 'slight' structural defects on the trunk, the result of poor pruning techniques in the past, the tree is in good health". The recommendation was for "Remedial pruning". The report stated a risk factor of 3 as meaning 'no immediate danger'
24From the documents tendered in evidence, it is not clear whether a Council officer inspected the tree, or whether Council relied upon the arborist's report in making its determination to refuse the 2007 application; however the Council refused the removal but did consent to pruning to a maximum of 40 per cent.
25The second application to Council, submitted in 2009, was accompanied by an equally sparse one-page inspection report prepared by J & L Trees. This report stated: "Tree has had the lower branches professionally removed previously. Tree looks to be in very good health..." and concludes: "No action required".
26Blacktown Council refused this application, stating that the tree was considered to be in a healthy condition.
27The applicant disputes the quality of the tree reports that accompanied the respondent's tree preservation order applications, as he believes they were invalid, incomplete and did not represent the facts.
28Whilst I am sympathetic to the applicant's assertion as to the incompleteness of the arborist reports, I am mindful that Blacktown Council accepted the reports and duly made its determination. Despite the significant shortcomings in those reports, I see reason to dispute their findings that the tree was healthy.
29In June 2011, the respondent engaged Dr Graeme Wells, an ecologist, to inspect the tree and the property and to provide a report to assist the Court's determination.
30It is evident from Dr Wells' five page curriculum vitae that he is very well qualified and experienced in ecology and conservation, having published 35 papers on the subject of crocodiles, mangrove systems and other wildlife in various tropical parts of the world. However, as Dr Wells claims no qualification or expertise in arboriculture and the assessment of risk in trees, I am not satisfied that he has the relevant qualifications or expertise to be assisting the Court in this matter.
31Despite my foregoing reservations, I propose to refer in part to Dr Wells' report because the applicant, in his submission, says he thinks Dr Wells' report is "impressive'" and he accepts the report "in its entirety".
32In Dr Wells' unsubstantiated opinion the tree "does not pose an immediate risk to any person" and is "not responsible for any of the alleged damage to the applicants property". In further unsubstantiated opinion he writes: "there is a future risk of root damage to the house foundation concrete slab..." and "I estimate that this future risk could manifest itself in ten years time".
33Despite finding no basis in fact concerning the alleged property damage or of any ill health or instability in the tree, Dr Wells adopts a pre-emptive approach and recommends the tree be completely removed, including the stump.
34It appears to me that the reason the applicant accepts Dr Wells' report "in its entirety" is because Dr Wells recommends the tree be removed.