Introducing the career retailer wage scheme was staggered over two years because of the $6 million annual hit to the group's bottom line.
Staff members who have completed the necessary training and 5,000 hours with the company can earn between $18 and $20 per hour.
Some 4,100 team members, or 63 per cent of permanent staff, are now earning $18 an hour or above.
Warehouse Group employs over 12,000 people nationwide and has an annual turnover of $2.6 billion.
Powell said staff retention had improved at the Red and Blue sheds and particularly at Noel Leeming which previously had significant staff churn.
The Red sheds' staff retention numbers have improved to 78.3 per cent in 2014 from 76.8 per cent in 2012, and to 82.6 per cent from 81.6 per cent at the Blue sheds over the same period.
It is a long-term push, rather than a short-term fix, Powell said.
"We've lead the way for the industry but haven't seen anyone follow us yet. We hope they will because this is a key issue for the industry," he said.
He pointed to long-time staffer Richard Currie, who has just been appointed a regional manager for the Red Sheds in the South Island.
The 34-year-old started with the company as a part-time checkout operator 17 years ago while doing computing courses at university.
Currie said he found himself spending more time at the store than university and finally decided to make retail his career.
After a few years on the shop floor he did a trainee management course and ended up managing his own store in Auckland.
The latest role sees him in charge of a $175 million business in the South Island with 700 employees and nine stores.
The group's career retail pathway starts with supporting secondary students, sponsorships for accredited qualifications like the new Massey University Bachelor of Retail and Business Management degree, store management development programmes, literacy programmes, NZQA national certificate in retail, and the career retailer wage.
Since 2009 5,323 secondary students have been through the Red Shirts in Schools programme where they spend time working in any of The Warehouse's 92 stores while still at school, with 76 per cent successfully graduating.
Company founder Stephen Tindall said it was incredibly important to give youth a stepping stone into employment, and learning on the job was the easiest way to do that.
"Career advisers try to give kids high aspirations and think they're doing them a disservice by introducing them to retail as a first job when in fact they can learn by studying and earn an income," he said.
He said the group's retail career pathway training was very different from when he started out in retail at his great-grandfather's company George Courts and did a three-year polytech management diploma studying part-time at night which included only two small units on retail.
More recently there has been a big retailing shift online but Sir Stephen said he thinks there will always be a place for bricks and mortar stores and he forecasts the group will end up with around one third of revenue from online and two-thirds still coming from bricks and mortar stores.
