A Tauranga business is in recovery mode after its building went up in flames.
Three people were taken to hospital after the fire on Birch Ave in Judea yesterday.
Fire and Emergency NZ group manager Scott Bell said the cause of the fire was being investigated.
"Indications are the fire started accidentally," he said.
"We were initially called at about midday. It took us an hour and a half to extinguish the fire."
Crews remained on site until about 7.15pm removing smouldering bales of insulation from the building.
Five fire crews were called to fight the fire, described by a neighbouring worker as "a bit intense".
People around Tauranga could see the smoke pouring out of the Brightr commercial building, until firefighters extinguished the blaze.
Brightr Bay of Plenty regional manager Carl Vujnovich said three team members were on-site when the fire started but had been accounted for.
A St John spokeswoman said three people were treated for moderate injuries and were taken to Tauranga Hospital.
Vujnovich said the rest of the Brightr team were off-site in Tauranga homes advising and installing heat pumps, ventilation and insulation.
The cause of the fire was unknown.
"We're awaiting the report from Fire and Emergency New Zealand's investigation," Vujnovich said.
"The wider Brightr team around the country are pitching in to assist us in getting back up and running as soon as possible."
Birch Ave Tyres is two doors down from the building and staff member Rory Kelleher said the flames were higher than the building beside it at one point.
He said he hadn't heard anything prior to the incident.
A Fire and Emergency NZ spokeswoman said the back half of a building that housed an air conditioning company was fully involved with fire when crews arrived.
All occupants were accounted for.
Five appliances were sent to the scene.
A police spokeswoman said police were notified of a building fire on Birch Ave just before midday and helped with traffic management.
A Bay of Plenty Times reporter said the corrugated roof at the back end of the building had collapsed and there were large holes burnt through other parts of the roof.
A man standing near the site said he saw the smoke from Baypark and came over.
"It's not every day you see smoke that dark," he said.
The fire prompted a warning from the Asthma and Respiratory Foundation for people with a respiratory condition to stay inside until the smoke cleared.
It said smoke from fires can worsen existing respiratory conditions and cause burning eyes, sore throats and coughing. It could be a trigger for asthma, bronchitis or COPD.
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