Fire crews were last night fighting a fire at a commercial property in the northern Waikato settlement of Tuakau.

Northern Fire Communications shift manager Megan Ruru said three fire trucks attended the blaze at TTT Products on Bollard Rd. They were alerted just after 9.30pm, but had left the scene by 11.30pm, Ms Ruru said.

Crews discovered machinery on fire inside the business, described as a manufacturer of pine poles on its website.

No one was inside the building, she said.