The Church of the Nazarene, in the Parkhead area of Glasgow, raised almost £800,000 over a decade to put towards a new purpose-built place of worship.
Then Royal Bank of Scotland agreed a £150,000 loan to the church backed by the UK Government's Funding for Lending Scheme.
The modern building, constructed by local firm Fleming Builders, will be officially opened with a street party on September 6.
Lead minister Ian Willis said the previous century-old church building was inflexible and expensive to run.
He said: The new church [is more] welcoming, more economically and environmentally efficient and far more flexible for our needs."
RBS relationship manager Barry McLaughlin said: "The church has been a huge part of the community for over one hundred years and it is incredibly important to continue this relationship over the years to come."