Balfour Beatty profits quadrupled in the six months to 29 June as cost-cutting and asset sales boosted the construction giant.
The company, which is a main contractor on the Crossrail railway line, said pre-tax profits rose to £50m from £12m last year after it reaped £22m from disposals.
However, Balfour took a £44m hit from the collapse of Carillion, which it was working with on the delayed Aberdeen Western Peripheral Route along with Galliford Try.
Balfour Beatty's order book rose by £1.2bn to £12.6bn. Its share price rose 2.7% to 298.3p.