An electrical fault in an external air conditioning unit is suspected to have caused a fire that damaged the Bayfair branch of physiotherapy business Body in Motion.
Two woman joggers passing the Girven Rd rooms raised the alarm at 6.30pm after smelling and seeing smoke pouring out of the wooden building.
Units from Mount Maunganui and Tauranga converged on the scene, with Senior Station Officer Phil Price saying it was lucky the fire was spotted early.
"It could have been a different outcome."
He said flames went under the building, up the inside of the wall and then spread into the ceiling space.