At 49.2 in January, down from 54.6 in December, the latest data signalled a decline in overall construction output for the first time since May 2020.
The latest survey also signalled a slowdown in new order growth to its weakest since June 2020.
Construction companies noted that the third national lockdown and concerns about the near-term economic outlook had led to greater hesitancy among clients, especially for new commercial projects.
Meanwhile, transport shortages and delays at UK ports resulted in another severe downturn in supplier performance during January.
Around 45% of the survey panel reported longer lead times for the delivery of construction inputs, while only 1% noted an improvement.
New business volumes rose slightly in January, but the rate of expansion lost considerable momentum since the end of 2020.
Survey respondents mostly commented on delayed projects in the commercial segment due to the impact of the pandemic, while some also cited less favourable demand conditions for residential work.
The latest data indicated that business expectations for the year ahead remained positive in January.
However, the degree of confidence eased to a three-month low.
Tim Moore, economics director at IHS Markit, said: “The construction sector ended a seven-month run of expansion in January as a renewed slide in commercial work dragged down overall output volumes.
“House building was the only major construction segment to register growth, but momentum slowed considerably in comparison to the second half of last year.
“Construction companies continued to report major delays with receiving imported products and materials from suppliers, with congestion at UK ports contributing to the sharpest lengthening of delivery times since May 2020.
“Adding to the squeeze on the construction sector, rising steel and timber costs led to the fastest rate of input price inflation for just over two-and-a-half years.
“The latest survey highlighted that construction companies have become more cautious about the business outlook.
“Output rebounded quickly after stoppages on site at the start of the pandemic, but hesitancy among clients in January and worries about near-term economic conditions resulted in a dip in growth expectations for the first time in six months.”
The data shows employment numbers dropped in January, which reversed the marginal expansion seen during December.
Job cuts were primarily linked to the non-replacement of leavers following project completions.
Purchasing activity increased for the eighth consecutive month in January, although the rate of growth eased further from November’s peak.
Duncan Brock, group director at the Chartered Institute of Procurement & Supply, added: “Builders were feeling the pressure in January as new order growth across the sector fell sharply to the slowest expansion rate since June last year and the commercial sector particularly acted as a brake to sustained recovery.
“Clients hesitated to commit to new workflows because of concerns around the vitality of the UK economy which in turn brought cautious job hiring and obliterated the gains made in employment numbers in December.
“The residential sector had been relatively immune to the effects of lockdowns and pandemic disruptions but it too was beginning to show signs of weakness for the first time in over six months.
“Progress in the sector feels like two steps forward and one step back for builders, as the shortages and the longest delays in supply chains since May affected optimism and led to the sharpest rise in building costs since June 2018.”
Gareth Belsham, director of the national property consultancy and surveyors Naismiths, said: “After seven straight months of expansion, economic gravity has finally caught up with Britain’s booming construction sector.
“But the loss of momentum is modest. While output growth dipped into negative territory in January, new orders continued to rise.
“Compared to the weakness in other industrial sectors, this is solid stuff.
“Alongside faltering demand, the construction industry is grappling with a raft of COVID and Brexit-related cost pressures.
“Cost inflation in vital building materials like plaster, steel and timber has soared to its highest level in two and a half years.
“Right now construction firms face two immediate challenges: how to keep up productivity levels as COVID restrictions limit construction workers’ ability to work on site together, and how much of the pain of rising material costs to absorb.
“Yet looking ahead, the mood remains upbeat – with the PMI data showing a majority of construction firms expect things to improve further over the next year.
“These are testing times but with so much momentum behind it, the industry should expect a soft landing rather than a sharp fall in the coming months.”
