The Dutch company's British building arm, BAM Construct, reported a reduced turnover of 拢945.9m, compared to 拢1,037.2m in 2010.
Pre-tax profit shrank from 拢17.1m to 拢11.5m.
However, the firm has cash in the bank to the tune of 拢211.7m.
New clients in 2011 included Network Rail, for whom it is building the new national centre at Milton Keynes.
At BAM Nuttall, the group's civil engineering business, turnover increased to a record 拢809m from 拢694m the previous year.
But its pre-tax profit also decreased, from 拢15.7m to 拢14.1m.
The firm's order book stands at 拢966m, following contract awards from Crossrail and Olympic Park Legacy Company.
BAM PPP, the investment arm, posted reduced turnover of 拢55.7m (2011: 拢60.9m) and profit before tax of 拢3.1m (拢3.9m).
Martin Rogers, who overseas the UK operations from Royal BAM's executive board, said: 鈥淭he steady performance is the result of a heightened focus on prudently managing the difficulties inherent in the UK market. The companies have resisted the temptation to bid at unsustainable prices, have concentrated on maintaining standards and additional management and supervision of the supply chain.
鈥淭he UK companies have focussed on maintaining quality, making new strides in sustainability, and innovations such as Building Information Modelling (鈥楤IM鈥�), in order to continue to provide a customer focussed service.鈥�
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