Len Buckeridge, one of Western Australia's most prominent businessmen, has died aged 77.

The billionaire businessmen was estimated to be worth $1.2 billion, amassing his fortune from the his Buckeridge Group of Companies (BGC), touted as Australia’s largest home builder.

Len Buckeridge

Len Buckeridge

He reportedly died of a heart attack at his desk at his Peppermint Grove home on Tuesday morning.

Mr Buckeridge had been in poor health for some time.

But that had not quelled his appetite for a business battle, with a billion-dollar lawsuit continuing against the state government over a private port development.

Mr Buckeridge claimed several state governments had failed to honour a 2000 agreement allowing a consortium led by the Buckeridge Group of Companies (BGC) to build and operate the port at James Point.

And his relationship with the state government was also strained over delays in his company construction of the Perth Arena, with costs blowing out to triple the original budget to almost $550 million.

Mr Buckeridge originally trained as an architect, building his first high-rise apartment blocks in Perth.

Being able to supply most of his building projects with products from his own factories allowed BGC to become a construction giant, although a weakening demand for building materials particularly in WA had reduced his fortune in recent years.

BGC and the state government said they were both preparing statements in tribute.