The 148-year-old Dunedin church has been open only to contractors since July, with the congregation worshipping at First Church during this period, Knox Church finance committee convener Dr Chris Bloore said.
Work in the church has included the installation of a $100,000 sprinkler system, having the ceiling cleaned and varnished, and restoration of deteriorated stained glass in the historic window on the church's back wall.
More than 5km of scaffolding used on the job had been removed, the last section to go being a small tower for the finishing touches to the south-facing stained glass window late this week, he said.
A working bee would be held today, with members of the congregation giving the church a thorough clean, he said.
One of the remaining jobs involved reassembling the more than 3000 organ pipes, which had been cleaned by the South Island Organ Company.
Organ specialist Christian Schleinitz said while the organ pipes were not as old as some of the ones he had worked on in his home Germany, "they were in need of a good clean".
"It is best to clean them every 10 years because they get so dusty," he said.
Knox minister the Rev Dr Sarah Mitchell said special "homecoming" services would be held tomorrow at 10am and 7pm to celebrate the upgrades.
From Monday, the church would be open every day from 8.30am to 5pm and the public was welcome to visit, she said.
