Systematic changes were found however over the period involved. The third analysis, of 110 speculative housebuilders, showed profit margins to be around four times those of general contractors but uncorrelated with company size. The second analysis, of a sub-sample of 8 very large companies, showed that profitability enhancement was associated with diversification into housebuilding and other related activities.
The size (turnover) of companies however was significantly positive correlated with profitability.
In the first analysis, the aggregated profitability of a sample of 80 UK general contractors was found not to differ significantly from 3.23 percent for each year of the period examined. The paper describes three analyses to examine differences in construction company POT profitability between (1) different financial years, and (2) different sizes of companies.
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