The main points:

Monthly construction output is estimated to have fallen by 0.2% in volume terms in January 2025; this follows a decrease of 0.2% in December 2024.
This decrease in monthly output came solely from a fall in new work (0.7%) as repair and maintenance grew by 0.4%.
Anecdotal evidence from survey returns noted adverse weather, including heavy rain, snow and storms as having a negative effect on output.
At the sector level, three out of the nine sectors fell in January 2025; the main contributors to the monthly decrease were private commercial new work, and private housing new work, which fell by 6.1% and 1.8%, respectively.
Construction output is estimated to have increased by 0.4% in the three months to January 2025; this came solely from an increase in new work (1.4%), as repair and maintenance fell by 0.9%.
The increase in construction output in the three months to January 2025 came solely from November 2024 (0.6%).

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ONS Construction Output in Great Britain: New Work Falls by 0.7% in January 2025