A man is fighting for life after a raging inferno at a tyre shop north of Brisbane this afternoon.

The fire broke out inside the workshop of Tyres & More in Caboolture at 1pm.

Explosions could be heard from the street as the blaze tore through the roof and left surrounding suburbs blanketed with smoke.

Queensland Fire and Emergency Service's Mark Peiker said firefighters were met with "pretty severe conditions" when they arrived at the scene.

"It's a tyre mechanical workshop so there's a lot of flammable liquids and gasses," Peiker said.

Peiker said the building manager suffered life-threatening burns and was rushed to Royal Brisbane and Women's Hospital.

No other employees were injured in the fire.

A crime scene has been declared but investigators may not know the cause of

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