"It would have been a different story if we didn't have a sprinkler system so a good save there. Yet again, it proves that smoke alarms and sprinkler systems save buildings."
Four crews responded initially but the blaze was large enough for firefighters to call in another four trucks, he said.
A specialist fire investigator had attended and would be back this morning to carry out an investigation into the cause.
There was no indication it was a suspicious blaze, Mr Dalton said.
Wesley Church, at 75 Taranaki St in central Wellington, was designed by Thomas Turnbull and opened in 1880.
Restoration was carried out after a fire severely damaged the front of the church about a century later in 1982.
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