(1) The development consent was issued only in respect of development of the second respondent's land.
(2) The drawings lodged in support of the development consent show the retaining wall along the common boundary located within the land of the second respondent.
(3) The construction drawings show the retaining wall constructed along the common boundary inside the property of the second respondent.
(4) Cross section drawings of the retaining wall in the construction certificate plans shows a strip footing 400mm deep with variable base depending upon the height of the wall above extending either side of the base of the wall.
(5) The cross section drawings in the construction certificate plans show an excavation behind the wall filled with "compacted granular back fill" 300mm in width.
(6) A 100mm agricultural drain with blue metal fill is shown outside the wall at its base within the compacted granular back fill.
(7) What appears to be the boundary line between the two properties is depicted in the drawings outside the southern face of the wall.
20 It is the applicant's submission that it is unambiguously clear that the construction certificate drawings show that integral parts of the retaining wall works are located on the applicant's land. The compacted granular back fill with agricultural drain are alleged to be the integral parts of the design and an essential part of the provision of structural adequacy and accordingly are part of the design of the wall in response to condition 24; there being excavation in excess 150mm without batter.
21 The argument by the applicant appears to be that once it is established that the compacted granular fill and the agricultural drain are part of the design of the retaining wall, then the wall must be regarded as situated on the applicant's land contrary to the depiction in the consent drawings particularly in the acknowledged circumstance that there was no consent from the applicant in respect of any work on his land.
22 No condition contemplated by s 80A(1)(f) was imposed by the council when it granted development consent. According to Mr Newport this provision deals with the carrying out of works not being works on land to which the applicant relates and in the absence of a relevant condition in that respect any work on the applicant's land is not authorised by the consent and therefore contrary to the legislative scheme of the EPA Act.
23 It is submitted therefore that it was not reasonably open for the certifier to form the requisite opinion of satisfaction in circumstances where the construction certificate plans depicted part of the retaining wall on the applicant's land where the consent of the owner of the land had not been obtained beforehand.
24 By contrast with s 96, which contemplates that a modification should result in "substantially the same development", regulation 145 requires satisfaction that the design and construction of the buildings depicted in the plans "are not inconsistent" with the development consent. It is apparent therefore that the degree of variation contemplated by regulation 145 is less than the limitation imposed by s 96 (Moy v Warringah Council (2004) 133 LGERA 49). However a finding of inconsistency by the court, as a question of fact, is not a justification for a finding for manifest unreasonableness of the Wednesbury type.
25 The primary critical question that arises for adjudication in relation to a finding of manifest unreasonableness is whether the compacted granular back fill and agricultural drain are sufficiently specific elements of the design that they are to be regarded as part of the retaining wall.
26 Notwithstanding any degree of distinction or difference between the wall the subject of the development consent and the wall as depicted in the construction certificate plans, the essential point upon which the applicant relies is that the latter encompass works on the applicant's land. This submission, put in its plainest terms, is that no inference could be drawn that the development consent contemplated works on the applicant's land. In fact condition 24 expressly stated to the contrary.
27 In response to an argument by the first respondent that the development consent did not resolve or specify what peripheral or further works might be required in order to actually build the retaining wall, the applicant says that if there were in fact essential works that were not the subject of the approval then either the development application was not finally determined or the additional works do not have the benefit of a development consent. Accordingly as the development consent did not approve any works on the applicant's land, it was not open for the certifier to form the requisite opinion that the construction certificate plans were not inconsistent with the consent. I reiterate that this is said to be particularly so as condition 24 insisted that the retaining wall be constructed within the boundaries of the development site.
Determination of the claim against the first respondent
28 I am not convinced that it is realistic to regard the fill and agricultural drain as part of the retaining wall contemplated by the development consent. The conceptual plan approved by the council depicted a wall occupying that part of the second respondent's land abutting against the southern boundary with the applicant's land. There can be no doubt that condition 24 reflects an understanding by the council that any retaining wall shall be constructed within the development site. In the case of the subject wall it was shown on the plans as being so situated.
29 In my opinion it was open for the certifier to recognise that as a matter of structural imperative a retaining wall would have the benefit of support necessary to ensure its stability. The engineers have taken this imperative into account by providing for the fill at the rear of the wall in accordance with normal practice. Recognising the need for the wall to have structural integrity, the certifier was entitled to assume that any necessary ancillary below ground works on the southern side of the wall are not inconsistent with a development consent that expressly gave approval to plans showing a wall built along a boundary. Although no express condition was imposed pursuant to s 80A(1)(f) of the EPA Act, and if even if it had been, foreseeably and arguably the second respondent had the obligation to obtain the permission of the adjoining owner to carry out works on his land and if necessary obtain any further consent in respect thereof.
30 By issuing the construction certificate, the certifier was doing no more than stating that if the work was completed in accordance with the construction certificate plans and any specifications in connection therewith it would comply with the requirements of the regulation 145 made pursuant to s 81A(5) of the EPA Act, which includes that the design and construction of the building will not be inconsistent with the development consent. It was perfectly open for the certifier to issue a certificate to that effect notwithstanding the revelation by the more detailed plans that work was required on the adjoining land. If the plans had not depicted the construction of the wall and ancillary works in the manner shown in the construction certificate plans, arguably the certifier may have been in breach of a duty to ensure that they comply, not only with the development consent, but also, for example, the relevant requirements of the Building Code of Australia.
31 Although I have not accepted that the granular fill and the 100mm agricultural drain form part of the retaining wall it is nevertheless correct that the work in connection with the construction of the retaining wall extended to the excavation, placing of the fill and laying of the agricultural drain. Even if these works are in some way deemed to be part of the wall I would apply the same reasoning to the effect that the works were an essential element of the wall and that the approval of the development application based upon plans showing the location of the wall itself along the boundary necessarily implied that the ancillary works would be necessary, whether or not they formed part of the wall. For this reason I do not need to make a formal finding in respect of whether the fill and drain actually form part of the wall but I am inclined to the view that they are merely ancillary works and do not comprise part of the wall itself (Williams v Blue Mountains City Council [2001] NSWLEC 73, unreported).
32 In Warringah Council v Moy [2005] NSWLEC 416, unreported Bignold J dealing with a different set of differences between the approved development plans and the plans certified, rejected the proposition that the certifying authority had contravened regulation 145(1)(a) notwithstanding a plethora of changes including a major change to the level of a car park, raising of floor levels and a significant number of changes to fenestration. Similarly in Lesnewski v Mosman Municipal Council [2004] NSWLEC 99, unreported Pain J was satisfied that notwithstanding changes in support structures, a setting forward of the building and a reduction in the level of a swimming pool the certifier did not act contrary to regulation 145(1)(a) when certifying that the construction certificate plans complied with the requirements of the Act.
33 Both of these decisions recognise the level of inconsistency that it is reasonable for a certifier to tolerate when considering building and construction plans that by their nature deal with the finer detail of construction and practical completion of building work. Bignold J held that the relevant statutory limitation on the power of a certifying authority to issue a construction certificate by reference to the requisite satisfaction on the part of the certifying authority treats that satisfaction according to the subjective standard. Bignold J at [63] explained the statutory test imposed by regulation 145(1)(a) requires:-
a comparison (yielding the result of "not inconsistent") between:
(i) the design and construction of the building (as depicted in the CC plans and specifications) and