Balfour, which recently handed over the Aquatics Centre for the London 2012 Olympics, said its order book had remained flat since August at 15.5 billion pounds and it is trading in line with its expectations.
The group announced a $470 million (295 million pounds) deal to supply military housing in the U.S. on Tuesday.
We continue to believe that the medium and long-term prospects for infrastructure markets remain positive. In the meantime, we are managing the business on the basis that market conditions will continue to be tough, said the company in a statement on Thursday.
Balfour is looking to new markets for growth as the UK government slashes public projects and spending to lower its debt, heavily impacting the domestic construction market.
Balfour, which already operates in 80 countries and offers a range of infrastructure services, unveiled a joint-venture with India's Tata Projects last month, in a bid to target opportunities in India and Sub-Saharan Africa.
Shares in Balfour closed at 239.6 pence on Wednesday, valuing the company at approximately 1.7 billion pounds.
(Reporting by Lorraine Turner; Editing by Neil Maidment)