The firefighters union and their employer have come to an agreement after months of strikes over pay and conditions.

Fire and Emergency New Zealand and the New Zealand Professional Firefighters Union signed terms for a new collective agreement, subject to a vote by union members, on Tuesday.

Union secretary Wattie Watson says firefighters will receive a pay rise between $10,000 and $20,000 from July next year.

She's optimistic the union's members will accept it.

"There's a lot in there that I think has come in the nick of time to keep firefighters in their jobs and to start enabling firefighters to spend a little bit more time with their families."

They could not have reached the agreement without government assistance and the advocacy of Minister of Internal Affairs Jan Tinetti, says Watson.

The offer before this, put forward by FENZ in July, was costed at $45 million whereas this settlement is costed at $145m, she says.

The settlement includes a 22-24 per cent pay rise over three years, as well as mental health support and cancer screening for firefighters, and financial assistance for income protection.

Fire and Emergency New Zealand chief executive Kerry Gregory. Photo: RNZ.

FENZ chief executive Kerry Gregory says it's a significant milestone.

"Our offer in August was at the extent of what we could afford. We are pleased that, with government support, we have been able to present a revised offer that recognises the critical role firefighters play while being sustainable for Fire and Emergency."

The agreement is expected to be completed before the end of the year, he says.

-RNZ.