Profits have risen by a third at the company behind the Warrington-headquartered equipment hire business A-Plant.
Ashtead Group announced underlying pre-tax profits of £489.6m for the year ending 30 April 2015, up by 35 per cent on a year earlier.
Underlying rental revenues climbed by 24 per cent to £1.8bn over the same period.
Ashtead's chief executive Geoff Drabble said: "2014/15 was another very successful year for Ashtead. The consistent execution of our well-established strategy focused on organic growth supplemented by bolt-on acquisitions has delivered both excellent financial results and significantly enhanced our geographic footprint and the breadth of the markets we serve.
"Our financial performance speaks for itself with Sunbelt and A-Plant achieving rental revenue growth of 25 per cent and 19 per cent respectively. Underlying group pre-tax profit rose 35 per cent to £490m and we generated a strong return on investment of 19 per cent."