The campaign does not seek a law change, but asks councils and other employers to adopt the living wage as a minimum for their own staff and as a requirement in contracts for services such as cleaning and security.
The only major sectors paying median rates below the local $18.40 figure in last year's NZ income survey were retailing, accommodation and food services ($15.14) and agriculture, forestry and fishing ($17.78).
National accounts tables show that raising median wages in retailing, accommodation and food services alone by 21.5 per cent, from $15.14 to $18.40, would cost about $1.6 billion a year. Wage costs across those sectors range from 31 per cent of final prices in hospitality to 37 per cent in supermarkets and other food retailing, so if the full cost of a 21.5 per cent wage rise was passed on to customers the effect would be price increases of between 6.7 per cent and 8 per cent.
However, Hospitality NZ chief executive Bruce Robertson said most restaurants and hotels would not be able to pass on such an increase.
"We have had critical increases in costs which the industry simply hasn't passed on because they haven't been able to in terms of the competitive nature of the industry."
He said more than 60 of his 2500 business members had closed since August and had not been replaced by other hospitality businesses. Paying workers a living wage would add to that toll.
Retailers Association adviser Barry Hellberg said union membership in retailing was minimal and wages in retailing were "a matter of negotiation between the retailer and each individual staff member".
Building Service Contractors president Patrick Lee-Lo, representing cleaning contractors, said labour costs represented 80 to 90 per cent of the $400 million annual turnover of commercial cleaning companies.
Lifting wages by 33 per cent from the current $13.85 an hour to $18.40 would therefore cost between about $105 million and $118 million.