That being so, the onus is on the plaintiff to prove his material and labour costs with reasonable certainty. I agree with the reasons expressed in G.T. Parmenter Construction Limited v. Sanders [1947] O.W.N. 539, where it was held that a contractor seeking to recover on a time and material basis must strictly prove the labour costs as there is no manner in which they can be checked except through the evidence presented by him.
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