The company reported a 28% increase in pre-tax profit to £79.5 million from £61.9 million in 2014.
In addition, turnover was up 10% to £3.2 billion.
Overall, strong performances were experienced across the businesses support services, international construction and equipment services businesses.
However, Chief executive Adrian Ringrose stated the UK Construction business had a difficult year, with "industry-wide pricing pressures" and "specific supply-chain failures" impacting three of its Energy from Waste projects.
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He said: "Over the last five years we have made substantial strategic progress creating a broader, stronger business.
"Our performance in 2015 was good, resulting in 12 per cent headline operating profit growth in markets that continue to offer both opportunities and challenges.
"In light of the changing shape of our portfolio over the last few years, we have started a strategic review of our Equipment Services business (RMD Kwikform).
"Overall, we expect 2016 to be broadly steady compared to 2015 as underlying growth is restrained by the impact of a slower order intake following an election year and the impact of the National Living Wage.
"However, we expect to return to growth in 2017, underpinned by our strong positions in attractive markets."
(LM)
