Fire investigators are examining the cause of a blaze that broke out in a Hamilton dementia rest home early this morning.

A small fire erupted in a hallway of the Kintala Lodge Rest Homes in Claudelands just after 4am.

Fire and Emergency northern communications shift manager Megan Ruru said the blaze was quickly stopped from spreading throughout the complex.

It was able to be contained in the smoke-logged hallway.

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She was unsure if residents in the Stanley St lodge had been evacuated.

Firefighters were now ventilating the property, which is a Ministry of Health 30-bed rest home complex that specialises in dementia care.

Up to seven crews were called to the emergency, which was raised to a second alarm after the initial alarm was triggered from inside the burning building.

Ruru said a fire safety officer would be examining the property to determine how the fire started.