The top specialists in the over £25m bracket have delivered outstanding jobs ranging from critical railways and nuclear power stations to football academies and British landmarks.
Aspin Foundations has a defined growth strategy to double in size every three years; it achieved this last year through diversification into complementary industries and by expanding its workforce.
Most growth has come from the firm’s core markets of rail, civils, renewables and infrastructure and it delivered a number of outstanding projects last year, including a new track-bed solution for the West Coast Main Line and a complex programme for the redevelopment of Nottingham station.
Caledonian Modular is a leading offsite modular construction specialist with a turnover of £52m achieved through planned, controlled growth.
CM’s methods typically shave a third off programme time and deliver high sustainability ratings.
The 50-year-old business now employs 300 people and has established itself in new markets such as education and student accommodation.
Last year was a successful one for Concrete Repairs, with turnover increasing by 35 per cent to a record £28m and profits up 88 per cent to £0.63m.
Framework contracts now contribute more than 35 per cent to annual turnover, with jobs including structural strengthening at Sellafield and marine repairs at Sullom Voe.
It also completed the largest car park refurbishment contract in the UK at Queensgate Shopping Centre in Peterborough: a £9m contract covering four multi-storey structures.
In 2014 it established a new division, CRL Composites, completed its first FRP composite bridge design concept and commenced manufacturing in the UK.
2014 saw FK Group celebrate 35 years in the industry, starting the year with a move to new headquarters and the opening of its third office.
Annual turnover reached £40.2m, an increase of £10.1m from the previous year, with gross profit also rising.
Significant projects in 2014 included work at the Manchester City FC Academy, the Turnmill Building in London and the City Council HQ in Stoke-on-Trent.
The firm also invested £420,000 in health and safety training last year and added 14 staff.
One of the UK’s leading infrastructure services contractors, FM Conway holds long-term contracts with 17 London boroughs to carry out vital road construction works and maintain many of the capital’s parks, stadiums, venues and communities.
Turnover has increased by more than 90 per cent in the past seven years from £87m in 2008 to £165.6m in 2014.
Pre-tax profit also grew by more than 240 per cent during the same period, with turnover projected to grow by a further 70 per cent by the end of 2017.
In addition, 2014 saw the firm invest around £10m in a new carbon-efficient asphalt plant near Heathrow.
Demolition, decommissioning, rail engineering and environmental services specialist Keltbray achieved the best performance in its 38-year history last year, reporting a 15 per cent increase in turnover in July.
This growth is forecast to continue this year thanks to an increasingly integrated service offering across its divisions, plus the securing of long-term complex contracts.
Flagship jobs won include work at Battersea Power Station, the Heygate Estate, Earls Court and Chelsea Barracks.
The firm also delivered 36,000 hours of training and provided 41 apprenticeships, internships or traineeships.
NG Bailey improved its profitability to £2.1m in 2014 and grew its order book at year-end to £550m.
It brought to life the world’s biggest dairy for Arla Foods, securing a 15-year maintenance contract, and pioneered an energy management innovation that has delivered 16 per cent savings for Morrisons from its estate energy bill.
It has renewed its focus on high-end residential developments by securing a £13m contract for a flagship project on the The Strand and was crowned Network Rail’s Supplier of the Year.
More than 90 per cent of William Anelay’s work comes in the heritage sector, making it one of the few larger contractors to specialise in this area.
After 267 years in business, the firm was named one of Yorkshire Post’s 50 fastest-growing companies.
It consolidated its national presence with high-profile projects including St Nicholas’ Chapel in King’s Lynn, Friar’s Mill in Leicester, Castle Drogo near Exeter and Westminster Abbey in London.