The firm enjoyed a surge in revenue to £225.8m during the six months to March 31 2014 from £152.4m last time while pre-tax profit hit £7.6m from £4.6m.

Renew is now well on its way to an annual turnover target of £500m.

Revenue ticked-up to £56.6m from £42m in the specialist building division – comprising Allenbuild, Walter Lilly and Britannia – where operating profit was flat at £1m.

Renew’s main markets are energy, environmental and infrastructure where M&E work has provided decent returns despite rivals’ woes in the sector.

Renew in the largest M&E contractor on the Sellafield nuclear site and is the only national provider of engineering maintenance services for Network Rail.

Damage to the rail network during the recent bad weather caused a surge in work for Renew which could skew turnover and profits slightly to the first half of the year.

Chairman Roy Harrison said: “The regulated markets in which the Group operates provide good visibility of opportunities and a strong pipeline of work.

“During the first half of the financial year our Rail business experienced very high levels of demand, partly due to the necessary emergency repair works following the very bad weather conditions which caused substantial damage to the rail network most notably in the South West of England.

“The consequence of this is that the Board considers that our first half results may prove to be slightly higher than those we will report in the second half, both in revenue and operating profit.

“The excellent underlying organic growth achieved in the first half, subsequent acquisitive growth and strong order book gives the Board great confidence that the Group will meet market expectations for the full financial year.”