The purchase manager's Construction Index, one of Britain's most powerful building industry standards, recorded a monthly improvement in almost two years in January with Prime Minister Boris Johnson winning the election.
The index rose to 48.4 from 44.4 in December, and still shows a decline in production, but it rose by more than forecasts of 46.6 and reached the highest level since May.
The last time the PMI in the construction sector more than that in one month was in April 2018 when the sector was recovering from the winter storms earlier that year.
Some survey participants said that low political uncertainty after the December 12 elections could unleash new projects and boost customer spending.
Purchasing Managers Index Showed that the construction companies were the most optimistic about their growth prospects since April 2018.