Construction giant Leighton has signed a new $1.4 billion funding agreement and raised another $US500 million ($A484.75 million) from an issue of notes.

The company said on Tuesday it had signed a $1.4 billion syndicated performance bond facility with 19 banks from Australia and the Asia Pacific region.

The facility refinances an existing $700 million, and provides additional funding.

“Bonds and guarantees are provided to our clients as a form of surety for the contractual obligations that we undertake,” Leighton chief executive Hamish Tyrwhitt said in a statement.

“Having this additional capacity provides the Leighton Group the ability to deliver the significant work in hand capacity it has.”

Leighton has also issued $US500 million of senior notes in the United States, which it said would be an attractive source of long-term debt capital.