Powell said the company had working to build capability in the retail sector for some time, and was influenced by the union-led New Zealand Living Wage campaign, which flagged the need for an increase in the country's minimum wage to address the growing income gap between rich and poor.
"We took account of the analysis done by the Living Wage campaign, which the First Union took part in, regarding the level of career pay rates required to reasonably support a household," he said.
The First Union welcomed the news as they prepare to negotiate their collective agreement in July, having accepted what it called a lower wage rise than justified last year when the company was in a turnaround phase.
"At that time the Warehouse CEO Mark Powell promised the workers and their union that the company would look at significant wage increases after the turnaround had been completed," First Union retail secretary Maxine Gay said. "We are pleased to see that Mark Powell is a man of his word."
Warehouse shares rose 1.2 per cent to $4.10 yesterday, and have climbed 35 per cent this year. The stock is rated an average 'hold' based on six analyst recommendations compiled by Reuters, with a median target price of $3.675.
The government re-introduced a youth minimum wage last month in a bid to fuel employment growth for young New Zealanders struggling to get a toehold in the workforce. It increased the minimum wage to $13.75 an hour in February.
Government figures today are expected to show private sector wages grew 1 per cent in the first three months of the year, according to a Reuters survey of economists. The average private sector wage was $25.17 an hour, according to the December quarter employment survey.