Fire crews have been called to a fire at a cafe in Wellington. (File photo)

A fire at a Wellington cafe saw the building evacuated of staff and patrons as fire crews doused the flames.

The fire started in a cooking ventilation system at One Fat Bird cafe in the suburb of Karori, on Karori Rd, shortly after 4pm on Tuesday.

Fire communications shift supervisor Belinda Beets said the fire had been extinguished using a high pressure hose by 4:30pm.

"There is a flat above the cafe, but everyone was evacuated and nobody has been hurt," she said.

"Fire crews are checking over the structure with thermal imaging for any hotspots, which could catch fire again."