Keltbray has posted a 45 per cent operating profit rise for 2014/15 while improving its margin to 4.3 per cent.
The demolition specialist increased turnover by 25 per cent in the 12 months to October 2015, with the firm bringing in £273.3m.
Gross profit was up 21 per cent to £45.4m while operating profit for the year stood at £11.6m.
The results back up a strong performance in 2013/14, when the firm increased turnover by 50 per cent and grew its pre-tax profit from £1.9m to £7.2m.
The bulk of Keltbray’s 2014/15 turnover (£202m) came from its demolition and civil engineering arm, with rail bringing in £54m and its environmental materials management arm turning over £16m.
Chief executive Brendan Kerr said: “Keltbray was formed as an earthmoving and groundworks company in 1976, and it is pleasing to see how we have grown to become an award-winning specialist contractor with a £270m annual turnover and more than 1,000 employees in our 40th year.
“Over the past four decades Keltbray has helped facilitate some of the largest and most iconic construction projects in the country, including the Shard and the Queen Elizabeth Olympic Park Stadium, and on major infrastructure projects such as Crossrail and the electrification of the Great Western Main Line.
“We are now firmly established as one of the country’s largest specialist contractors and are proud of the continued strengthening of our business.”