The UK Construction PMI is a monthly survey indicator of whether construction activity is increasing or decreasing compared with the previous month. Its headline, the Total Activity Index, is a diffusion index: above 50 signals an overall increase, below 50 a decrease, and 50 no overall change. It is not a percentage growth rate or a direct estimate of the pound value of construction work.
How the UK Construction PMI is calculated
S&P Global compiles the index from questionnaire responses from a panel of around 150 construction companies. The panel is stratified by company workforce size, based on contributions to GDP. Responses are collected in the second half of each month, and companies compare the relevant measure with the previous month. Survey data were first collected in April 1997. (S&P Global methodology)
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For each measure, responses are converted into a balance: “higher” responses count in full, “unchanged” responses count at half weight, and “lower” responses count zero. The result is an index from 0 to 100. S&P Global seasonally adjusts the indices. (S&P Global methodology; S&P Global PMI FAQ)
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What readings above and below 50 mean
- Above 50: the balance of responses points to an overall increase compared with the previous month.
- Below 50: the balance points to an overall decrease.
- At 50: the index indicates no overall change.
The distance from 50 measures the strength of the survey’s directional signal, not the percentage change in construction output. A reading of 60 does not mean output grew 10%. If the index falls from one reading above 50 to a lower reading that remains above 50, the signal still indicates expansion, but the balance of positive responses is less strong. (S&P Global methodology; ONS comparison of construction output and PMI data)
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What the headline measures—and what the other indices add
The headline is the Total Activity Index, which tracks changes in the total volume of construction activity compared with one month earlier. S&P Global describes its broad role as comparable to the Manufacturing Output Index and Services Business Activity Index, but cautions that the Construction PMI is not comparable with the headline manufacturing PMI figure. (S&P Global methodology)
The survey also reports indicators for residential, commercial and civil-engineering activity; new orders; employment; quantity of purchases; supplier delivery times; input prices; subcontractor use, availability, rates and quality; and future activity. These sub-indices can help show which types of work or business conditions are moving alongside the headline. They remain survey indicators, not direct measurements of output or costs. (S&P Global PMI FAQ)
Why the PMI differs from ONS construction output
The two statistics measure different things. The PMI asks businesses whether performance was higher, unchanged or lower than in the preceding month. ONS construction-output statistics collect the value of work and publish current-price and chained-volume estimates. Because their underlying variables and methods differ, they can present different pictures of performance. (ONS comparison of construction output and PMI data)
Use them as complementary evidence: the PMI gives a timely survey-based signal of reported direction, while ONS estimates quantify the value of work within the official statistical framework. A PMI reading is not an output growth rate and should not be expected to match a later ONS estimate.
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How to compare PMI readings with other indicators
Before interpreting an apparent disagreement between indicators, check that they describe comparable measures and periods. In particular, compare:
- What is measured: survey direction, a value of work, or another quantity.
- Reference period and publication timing: which month the figure covers and when it became available.
- Coverage: geography and the construction activity or businesses included.
- Adjustment: whether the series is seasonally adjusted.
- Index type: whether a figure is the total-activity headline or a sub-index.
What can change after publication
S&P Global says underlying survey data are not revised after publication, but seasonal-adjustment factors may be revised, which can affect adjusted series. A historical adjusted reading can therefore change even when the underlying survey responses have not been revised. (S&P Global methodology)
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Where to find detailed series
S&P Global says detailed PMI data, including sub-indices, are available by subscription. Its public methodology and FAQ explain the headline and survey measures; the cited material does not establish a current monthly reading, so no latest value is quoted here. (S&P Global PMI FAQ)
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