Analysing the types of procurement used in the UK: a comparison of two data sets
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Davis Langdon and Everest (DLE) have published the results of a triennial survey on contract use since 1984. As a regular survey on the subject, this has been regarded as one of the main sources of information on contract use for surveyors and others involved in construction procurement. However, since the early 1980s Emap Glenigan (EG) has also produced marketing information based on planning applications. This information is sent to firms in the construction and property sectors. The data includes the value of projects and the types of procurement system used. Whereas the DLE data is based on a non-random sample, the EG data (used in this paper) is a census of all projects valued at over ₤100,000. The EG data on contract use has recently been made available for analysis and a comparison of the EG and DLE data sets has been used to verify the DLE survey results. The comparison of the EG and DLE data shows that at the 95 per cent confidence level there is no significant difference in the two sets of data in terms of the share of contracts used by number of projects. The EG data confirms the DLE findings that the traditional procurement system remains by far the most popular method, followed by design and build. The other forms of procurement in aggregate only form a small percentage of construction transactions. However, differences between the two sets of data in terms of the share in the total value of projects represented by different contract types are shown to be significant. As the DLE data represents a non-random sample of quantity surveying practices and the EG data is based on responses from contractors, developers and local authorities, differences in the proportion of contracts could reasonably be expected. The paper concludes that the EG data on the value share of contracts for new construction only is preferred to the results of the DLE survey, but the DLE survey may better reflect the value shares of all work including repair and maintenance.
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