22 As I sought to explain in Trewin v Felton, interference with an easement, which makes it less convenient although it remains passable, is an actionable nuisance [Jalnarne v Ridewood (1991) 61 P & CR 143; Trewin v Felton, [68]-[70]], and constitutes a substantial interference. As Hywel Moseley J said in Jalnarne (at 150):
The plaintiffs are entitled pursuant to the grant in the conveyance to a right of way over that part of the access road which lies within the compound perimeter. I was satisfied by the evidence that lorry drivers would find it easier to reverse their lorries if they could before reversing enjoy that right of way by drawing forward onto that part of the access way which lies within the compound. The compound prevents them from drawing forward onto that part of the access road and makes reversing lorries more difficult. Irrespective of the fact that the plaintiffs are not particularly concerned that their access to the disused railway line is blocked by the compound, I am therefore satisfied that the compound interferes with the right of way, and does so substantially. For that reason it is a nuisance.
23 Similarly here, the greater convenience, which the wider carriageway affords when compared to the proposed modification, is a practical benefit to the dominant owners.
The proposed modification would substantially injure the dominant owners
24 For the purposes of s 89(1)(c), a substantial injury is one that has real and present substance, but it need not necessarily be large or considerable [Re Mason].
25 Each party retained a valuer. It was the opinion of Fraser Lorne's valuer, Mr Covey, that modification of the easement would have no adverse impact on the freehold value of 23 and 25 Lorne Avenue and would occasion no diminution in value, and assessed $25,000 in respect of each lot as fair compensation for modification of the easement. Mr Wolf, the valuer retained by the dominant owners, initially reached quite a different conclusion (because he apparently misunderstood the extent of the modification proposed), but ultimately the valuers agreed that fair compensation for the loss of the proprietary rights of the dominant owners would be $25,000 for each lot.
26 There can be "substantial injury" for the purpose of s 89(1)(c) even if the proposed extinguishment or modification would not detrimentally affect the value of the dominant land. In Heaton v Loblay, Myers J said (at 335-6):
I turn to par. (c). Under this paragraph the only question is whether the proposed modification would substantially injure the plaintiff. In my opinion it would. Expert evidence has been tendered on behalf of the defendants to prove that the modification would not depreciate the value of the plaintiff's property. I do not pause to consider that point because loss of value is not necessarily a decisive factor and where, as in this case, the covenant was not exacted to preserve the value of the covenantee's land but for another and different purpose, value is not a factor at all.
The plaintiff has a most unfortunately and seriously afflicted husband and son. To them and to her the maximum degree of privacy which they can obtain is valuable. At present they enjoy a substantial measure of privacy on the veranda of their home. The terrace, if it is built, will be supported by a high brick wall nineteen feet long, right on the boundary of the plaintiff's land and will be on the same level as the plaintiff's veranda.
27 In Webster v Bradac (1993) 5 BPR 12,032, the then Chief Judge wrote (at 12.035):
I turn now to the question raised by para (c) of s 89(1), namely whether the proposed modification will substantially injure persons owning (or having an interest in) other lots in the subdivision. As I said in Mogensen v Portuland Developments [1983] NSW Conv Rep 55-116 at 56,856-7, in this context "substantially" connotes injury which has substance in the sense of being real or appreciable. The kind of injury contemplated in para (c) is injury to the relevant person in relation to his ownership of (or interest in) the land benefited. The injury may be of an economic kind, for example, reduction in the value of the land benefited, or of a physical kind, for example, subjection to noise or traffic, or of an intangible kind, for example, impairment of views, intrusion upon privacy, unsightliness, or alteration to the character or ambience of the neighbourhood. These arbitrary categories, whilst serving to illustrate the ambit of the concept of injury for the purposes of the paragraph, are neither mutually exclusive nor necessarily exhaustive, and what I have described as injuries of a physical or intangible kind could well also affect the value of the land in question. However, it is clear that a person may be "substantially injured" within the meaning of para (c) notwithstanding that the value of his land would be unaffected or even increased by the proposed modification. It is also clear, particularly in the case of injuries of what I have called an intangible kind, that the subjective tastes, preferences or beliefs of particular individuals may, within limits of reasonableness, give rise to injury in the relevant sense to those individuals.
28 For the same reasons that support the conclusion that the easement unmodified secures a practical benefit to the dominant owners, it cannot be said that the proposed modification will not substantially injure them. It will leave them with a less convenient access than that which they presently enjoy. The reduced convenience to the dominant owners afforded by an access way half the width of that they currently enjoy is a real and appreciable detriment, and an injury of substance. The circumstance that the narrower access might comply with current planning guidelines does not deny this. This ground is not made out.
Relief should be refused on discretionary grounds
29 The grant of relief under s 89 is discretionary [Pieper v Edwards [1982] 1 NSWLR 336, affirming Edwards v Pieper [1981] 1 NSWLR 46; Re Cook [1964] VR 808, 810; Re Markin; Re Roberts [1966] VR 494, 498; Perth Construction Pty Ltd v Mount Lawley (1955) 57 WALR 41, 48]. It has often been emphasised that great caution is required in acceding to an application for the extinguishment or modification of an easement, which after all is a proprietary right. Thus in Tomara Holdings Pty Ltd v Pongrass [2002] NSWSC 195; (2002) 10 BPR 19,531, Hamilton J said (at [20]):
In determining an application for extinguishment or modification there must be borne in mind the potentiality of such an order to expropriate proprietary rights. In the often cited words of Farwell J in Re Henderson's Conveyance [1940] Ch 835 at 846:
'Speaking for myself, I do not view this section of the Act as designed to enable a person to expropriate the private rights of another purely for his own profit. I am not suggesting that there may not be cases where it would be right to remove or modify a restriction against the will of the person who has the benefit of that restriction, either with or without compensation, in a case where it seems necessary to do so because it prevents in some way the proper development of the neighbouring property, or for some such reason of that kind; but in my judgment this section of the Act was not designed, at any rate prima facie, to enable one owner to get a benefit by being freed from the restrictions imposed upon his property in favour of a neighbouring owner, merely because, in the view of the person who desires the restriction to go, it would make his property more enjoyable or more convenient for his own private purposes.'