Fire crews have been battling a large blaze in Greerton this morning.

Crews attended a building fire on Chadwick Road around 5:30am this morning, Fire and Emergency New Zealand northern communications shift manager Dallas Ramsay says.

The fire is in a building used as a tattoo parlour, Dallas says.

'The fire is around 13 meters by 25 meters, three levels, and a third of the building was burnt.”

'We're dampening down [hotspots] and investigating.”

There are currently two units in attendance and police have been advised because of the size of the fire, she says.

'It's certainly winding down, they've released a number of appliances and we're now only left with two trucks there.”

A caller to SunLive has seen the building and says it is a mess.

It has taken all of the new business and some of the Thai Restaurant next door, they say.

A police spokesperson, says the fire was reported to police around 5:40am

'We have been alerted and are at the scene.”

Both police and fire are unsure if the fire is suspicious at this stage.