Cooper & Oxley Builders has won a $22.6 million contract to construct a new courthouse in Kununurra.
Cooper & Oxley was selected from a range of WA builders in a tender process run by the Department of Finance.
The unsuccessful bidders were Cimeco, Emco Building and Norbuilt, who all tendered to build the courthouse at a cost between $23 million and $24 million.
The Department of the Attorney General said the courthouse project would cost $43 million to complete, with that cost including pre-construction design works and final fit-out, and be completed in 2014.