The firm's turnover was £949.8 million, down by 0.3% on 2017, but still showing consistency.
There was also a strong order book of £1.76 billion and no debt, with £83 million cash reserves.
James Wimpenny, Chief Executive of BAM Construct UK, said: "Our customers appreciate the consistent performance we deliver, both in our operations and in our balance sheet.
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"Our increased profitability reflects our business reducing risk by selective tendering and working smarter. Ultimately this consistency benefits both us and our clients in a sector which has experienced recent instability.
"We are assisted by having a good balance of work between the private sector (58%) and public sectors (42%) and 65% of our work is repeat business, as clients that we have worked with before re-engage us. That is something I believe shows that our collaborative culture is one that our clients appreciate adds value to their projects. I am also pleased with progress at our growing FM business."
The company also reduced its carbon emissions (tCO2e) by 13% to an all-time low of 11,488 tonnes.
BAM Construct UK has seven operating companies in the construction sector, plus separate businesses for plant hire, services engineering, facilities management, property development and design.
