Fletcher Building is restructuring to cut costs of $30 million a year and has announced an executive shakeup as part of its new strategy.

The company is changing tack to a simpler business model after it revealed losses of nearly $1 billion on major construction contracts including the SkyCity International Convention Centre and Christchurch's Justice and Emergency Services Precinct.

The country's largest construction firm told investors this morning that it will "target investment behind its most strategically important and highest returning businesses; increase its focus on innovation, pursue improvements in procurement, operational efficiency and working capital, and introduce a simpler and leaner decentralised operating model."

The new model will cut overheads by about $30m a year but will cost between $85m and $95m to introduce.

Chief executive Ross Taylor indicated earlier this year that job losses would be announced in June but there are no specifics revealed in announcements to the stock exchange this morning.

He told the Herald the business expected to announce lay-offs to trim overheads and said he was deeply disappointed about that prospect.

Fletcher reaffirmed guidance for the current financial, putting earnings before interest and tax at $680m-$720m.

Following the woes at the company's building and interiors unit, chairman Ralph Norris resigned.

The firm will reveal changes to its board tomorrow.

It appointed a number of executives to new positions today, including revealing that Dean Fradgley in the new role of chief executive in Australia. All Fletcher's Australian businesses will now sit within under his division.