(a) The identification of the contract between the parties
3 The second respondent is the husband of the first respondent. The second respondent met the appellant when the latter was undertaking construction works on a property opposite the premises of the first respondent's parents. They entered into discussions with a view to the appellant being engaged to construct a dwelling house on the property. His Honour noted at [3] that it was common ground that the second respondent acted as agent of the first respondent at all relevant times.
4 During the course of negotiations, a number of documents were created. These relevantly included:
■ an itemised quotation totalling $533,800 (the alleged contractual quotation) dated 25 January 2000 and initialled by the appellant and the first respondent (Blue 3, 1175); and
■ a Department of Fair Trading Standard Form Home Building Contract, dated 1 February 2000, in booklet form signed by the appellant and first respondent (the Home Building Contract) (Blue 3, 881).
5 His Honour found (at [14]) that it was common ground that a final contract was concluded between the parties on a date in either late January or early February 2000 when the appellant met with the respondents at the first respondent's parents' house (the meeting). However, the parties disagreed as to the sequence in which the above documents came into existence and which of them governed their contractual relationship.
6 The respondents contended that the contract between the first respondent and the appellant was constituted by the Home Building Contract and incorporated documents including the specifications and drawings and that this contract was signed by the parties during the course of the meeting.
7 The contract price in the Home Building Contract was stipulated to be $533,800 (Blue 3, 886). Its signature page (Blue 3, 910) contains the signatures of the appellant as builder and first respondent as owner each of which was witnessed by the second respondent. The date of the contract is stated to be 1 February 2000. The second respondent purportedly inserted this date some time after the meeting to reflect the date that a deposit of $25,000 was paid to the appellant.
8 Stapled to the inside cover of the Home Building Contract (at Blue 3, 883) was a typed quotation (the booklet quotation). Except for some handwritten notes made by the second respondent next to some of the items, that document is identical to the alleged contractual quotation (for the details of which, see [8] below). The booklet quotation appears to have been initialled by the appellant. That quotation reveals a total price of $533,800 comprising a fixed sum of $375,000 and prime cost (PC) items totalling $158,800.
9 The appellant agreed that he signed the Home Building Contract and that he discussed the booklet quotation with the respondents. (Although he initially denied having signed the booklet quotation, this was conceded in cross-examination.) However, he contended that within minutes of his signing of the Home Building Contract, that agreement was discarded and replaced with another contract constituted by the alleged contractual quotation and certain oral terms. Essentially, the appellant asserted that the respondents had told him at the meeting that they wanted to save money and that he should not follow the architect's specifications incorporated into the Home Building Contract but that the second respondent would instruct him as to the nature of the works that he was to undertake.
10 The parties therefore agreed, so the appellant contended, to take responsibility for the jobs that they respectively completed and that the contract price would be reduced to account for any works that the second respondent himself arranged for third parties to complete. In light of this agreement, the second respondent typed up the alleged contractual quotation. It reflected the same price as that contained in the Home Building Contract, that is, $533,800, which was formulated from an itemised list of works and prices. It was also identical to the booklet quotation except for the second respondent's handwritten notes thereon. The alleged contractual quotation was signed by the appellant and the first respondent and dated 25 January 2000 in handwriting. The appellant contended that this document, combined with oral instructions given to him by the second respondent from time to time, formed the basis of the contractual relationship between the parties.
11 The primary judge held (at [16]) that on both the appellant's and the respondents' case with respect to which document constituted the contract between them, there was no doubt that the contract price was $533,800. (It was agreed that an additional $10,000 was to be paid to the appellant if the respondents decided to proceed with the construction of a fourth bedroom, which they ultimately did, bringing the total contract price to $543,800.)
12 However, his Honour was required to determine the circumstances in which each of the documents referred to at [4] above came into existence. He found (at [16]) that the appellant's assertion that the alleged contractual quotation was prepared in order to become the basis of the contract after the preparation of the booklet quotation and the signing and discarding of the Home Building Contract, was "entirely unreliable".
13 His Honour preferred the second respondent's evidence that the alleged contractual quotation was prepared before the iteration of that document constituting the booklet quotation. He found (at [17]) that the alleged contractual quotation was simply the final quote in which the agreed upon negotiated price of $533,800 was recorded and that the booklet quotation came into existence subsequently, when the second respondent made handwritten notes on a copy of the pre-existing document. His Honour also noted (at [17]) that the booklet quotation, stapled to the inside cover of the Home Building Contract, was only relevant insofar as it reflected the manner in which the contract price was arrived at and thus the objective intention of the parties as to price. He stated that he was satisfied that none of the discussions alleged by the appellant to the effect that the Home Building Contract was discarded, varied, replaced or renegotiated took place at the meeting.
14 His Honour therefore found (at [18]) that the contract that governed the building works, the subject of the dispute, was comprised of the Home Building Contract dated 1 February 2000. He continued: