IN Brief:
- The UK construction PMI fell from 46.1 in September to 43.6 in October, its weakest reading since June.
- Residential activity declined to 35.1, while commercial construction and civil engineering also remained below the expansion threshold.
- New orders and purchasing fell, supplier delivery times lengthened, and 48% of surveyed companies reported rising input costs.
UK construction activity contracted at its fastest pace since June during October, as a further deterioration in housebuilding outweighed more resilient conditions in selected infrastructure markets.
The latest S&P Global UK Construction Purchasing Managers' Index fell to 43.6 from 46.1 in September, reversing the previous month's tentative improvement. The headline index remained below the neutral 50.0 threshold for the twenty-second consecutive month, indicating a prolonged contraction in construction business activity.
Residential construction recorded the sharpest decline, with its activity index falling to 35.1 from 40.7 in September. This was the weakest reading since December 2025 and the lowest recorded during 2026, reflecting deteriorating conditions for housebuilders and their construction supply chains.
Survey respondents identified weak consumer confidence, elevated risk aversion, and rising borrowing costs as the principal constraints affecting residential work. These factors influence demand for new homes and the financial assumptions used by developers when deciding whether to proceed with construction.
Higher borrowing costs can affect housing development through several channels. Mortgage affordability influences the number of potential purchasers able to commit to new homes, while development finance costs affect the capital required to acquire land, complete enabling works, and progress construction before properties are sold.
When anticipated revenues weaken or financing becomes more expensive, developers may reconsider the pace of individual sites. Construction programmes can consequently slow even where planning permission has already been granted and the physical development remains technically deliverable.
Commercial construction also contracted during October, recording an index of 46.3. The result represented a deterioration from September's 16-month high, indicating that the improvement in commercial activity had not developed into a sustained recovery.
Civil engineering was comparatively resilient, although activity continued to decline. Its index rose to 45.9 from 42.2 in September, representing the slowest rate of contraction since May 2025.
The relative improvement reflected stronger demand in particular infrastructure markets. Survey respondents reported rising workloads associated with data centres, energy networks, and utilities projects, providing some support for contractors operating outside the weaker residential and commercial sectors.
Those projects are supported by different commercial drivers from conventional housebuilding. Data centre construction can depend on investment in computing infrastructure, while utilities and energy networks are influenced by planned infrastructure programmes and the requirements of operators seeking to expand or maintain their assets.
The differences were not sufficient to return civil engineering to overall growth. A reading of 45.9 remains below the neutral threshold, indicating that companies reporting falling activity continued to outweigh those reporting increases.
The PMI is a diffusion index compiled from survey responses rather than a measure of the monetary value of construction output. It records the direction of changes in business conditions compared with the preceding month, providing an early indication of industry activity before more comprehensive official statistics become available.
October's survey was based on responses from approximately 150 construction companies, collected between 12 and 29 October. The findings describe conditions experienced by the participating businesses and should be distinguished from official estimates of completed construction work.
New business remained under pressure across the sector. The new orders index fell to 45.2, indicating the sharpest reduction in incoming work since June. Respondents identified cautious client spending and fewer opportunities to tender among the factors affecting their order books.
Declining orders can constrain contractors before the full effect becomes apparent in current workloads. Projects already under construction may continue progressing towards completion, while fewer replacement schemes enter the secured pipeline.
Contractors must therefore manage labour, plant, subcontractor capacity, and purchasing commitments against the work they expect to deliver in subsequent months. A reduction in new orders can influence decisions on recruitment, equipment investment, and the timing of procurement even before existing construction projects finish.
Purchasing activity declined sharply during October, largely because fewer new projects were available to replace completed work. Demand for construction materials and products consequently weakened, although supplier performance continued to deteriorate.
Delivery times lengthened for the third consecutive month, with the latest deterioration the greatest since May. Survey respondents attributed delays to low stock levels, transport disruption, and pressure affecting manufacturing supply chains.
Weaker purchasing demand does not necessarily result in immediate improvements to product availability. Supplier lead times also depend on manufacturing schedules, inventories, transport capacity, and the availability of specific materials or components.
Input cost inflation accelerated to a four-month high. Construction companies reported higher fuel surcharges, energy costs, and raw material prices, with aggregates, concrete, electrical products, and steel among the categories identified.
Almost half of surveyed companies, 48%, reported increased input costs during October, compared with 25% in September. The findings indicate that cost pressure intensified despite the contraction in overall purchasing activity.
The effect on individual construction contracts depends partly on the agreed commercial terms. Some arrangements permit price adjustments under specified conditions, while others leave contractors exposed to increases that occur after prices have been agreed with clients.
Where material or energy costs rise without a corresponding adjustment to contract revenue, project margins can narrow. Higher costs can also affect the viability of proposed developments when tender prices exceed the financial assumptions used during earlier planning stages.
Business expectations weakened alongside current activity. The future activity index fell to 53.2 from 55.0, indicating that companies remained more likely to anticipate growth than contraction over the coming year, but with confidence declining to its lowest level since May.
Thirty-four per cent of surveyed companies expected activity to increase over the next 12 months, compared with 27% forecasting a decline. The relatively narrow difference reflected continuing uncertainty about client spending, construction demand, and the wider economic environment.
Infrastructure investment provided one of the few positive factors identified by respondents. Demand associated with data centres, energy networks, and utilities could support selected contractors, but the survey did not indicate a broad recovery across the industry.
The October results leave UK construction entering the final months of 2026 with weaker order books, declining activity, and renewed input cost pressure. The next survey will establish whether the relative resilience of infrastructure work continues and whether residential activity stabilises after its sharp deterioration.
