Belgium’s construction output stalled year-on-year in September 2025, following an upwardly revised 7.3% growth in the previous month. The stagnation was mainly due to lower output in building construction (-2.5% vs 6.3% in August) and civil engineering (-2.3% vs 6.1%). Additionally, production growth slowed significantly for specialized construction activities (1.3% vs 7.8%). On a seasonally adjusted monthly basis, construction activity fell by 1.1% in September, easing from a 1.6% drop in the preceding period.