Hundreds of fast-food workers at KFC, Carl's Jr and Pizza Hut will strike this weekend.

Workers employed by Restaurant Brands and members of Unite Union voted to take strike action with 88 per cent of the 763 who took part set to down their cooking utensils.

The strike starts at 2pm today and will last until 2am on Monday morning, which includes employees from Carl's Jr and Pizza Hut.

Unite National Secretary and Lead Negotiator Gerard Hehir says wages and starting rates is the reason for strike action.

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Negotiations had stretched for six days but no resolution had been reached, he said.

One of the issues of contention was how much more skilled staff received above the starting rate for junior employees.

Hehir said the matter came to a head by the minimum wage went up to $17.70 in April.

While starting rates were raised, the same didn't take place for more senior employees, he said.

"Low-wage employers need to realise that they can't get away with just increasing their lowest rate only and undervaluing their experienced and skilled staff," he said.

Pt Chev KFC. Photo / File
Pt Chev KFC. Photo / File

Restaurant Brands confirmed to the Herald employment negotiations with Unite Union for waged and salaried union members have stalled.

The company said around 1,500 union employees are seeking wage increases of more than 7 per cent, with Restaurant Brands' current offer of increases across KFC and Carl's Jr employees sitting at 5.7 per cent.

"These increases also balance the impact of minimum wage increases with the need
to minimise increases to the consumer," Restaurant Brands New Zealand CEO, Arif Khan told the Herald.

Restaurant Brands apologises if any customers are impacted during this period.

The NZX-listed firm was partially taken over earlier this year in an $881m deal from Mexican fast-food investor Finaccess Capital.

Restaurant Brands' recent move to bring the Taco Bell brand to New Zealand and Australia is just one of several developments that attracted Finaccess.

Another is the steady growth Restaurant Brands has shown over the past decade with its portfolio of well-known food brands - KFC, Pizza Hut and Carl's Junior.

Restaurant Brands' shares are trading for $9.15 each.