According to Statistics New Zealand, 17,200 people in the wider Wellington region earn between $13.25 and $14.25 an hour.
Miss Gundersen-Reid agreed with Mr Key that the 50c rise would not have a significant impact on available jobs but said some smaller businesses such as a small store or 'one-man-band' builder could delay hiring extra staff for a few months.
"[The increase is] fair from a business perspective because it is going up quite regularly after not going up for such a long time."
However it was "still not a huge amount of money for a family to live off", she said.
Employers and Manufacturers Association chief executive Kim Campbell said for people at the bottom end of the pay-scale, even small amounts of $20 extra a week to their take-home pay could make a big difference.
Other "safety net" measures were available for low-income earners such as taxpayer-funded Working For Families payments and tax credits.
Most employers would be able to handle the increase because it was a manageable rate, but anything higher could have been a struggle for sectors such as hospitality, he said.
Living wage campaigners, who believe $18.80-an-hour is the bare minimum needed to support a small family, have called the increase a step in the right direction.