Atkins reported yesterday that more than 83% of shareholders had voted in favour of the £2.1bn deal.

The takeover, which will create a £7bn revenue business employing over 50,000 staff, is now expected to finalise this Friday.

Neil Bruce, President & CEO of SNC-Lavalin, said: “By combining two highly complementary businesses, we will increase our depth and breadth of services to position us as a premier partner to public and private sector clients.

“It also creates new revenue growth opportunities in key geographies by positioning us to capitalise on increased cross-selling and the opportunity to win and deliver major projects in new regions.”

SNC-Lavalin said it expects to make £50m in annual cost saving at Atkins.

The Atkins brand including Faithful + Gould will remain during the takeover period but will be looked at in the long-term depending on client feedback.

SNC-Lavalin has also set aside £5m in cash “retention payments” for senior Atkins managers to ensure they stay at the firm for at least the next 12 months.