The firm said it had released the results of an internal review undertaken last year to the OFT, for which it expected to be granted leniency.
There were 112 companies accused of "bid-rigging" today after one of the biggest ever investigations by the competition watchdogs.
Balfour Beatty said: "The company and its operating businesses have co-operated fully with the OFT in all aspects of its investigation. As a result and subject to ongoing co-operation, the OFT has granted leniency to Balfour Beatty, thus reducing any fines which might ultimately be levied on Balfour Beatty or any of its operating businesses."
It added: "The company will respond to the OFT in respect of its statement of objections in due course."