Unusually in a union of Church of Scotland congregations, both buildings were retained for worship.
Its site, overlooking the banks of the River Ness, has been used for worship since Celtic times.
Thus the congregation can claim to have been founded by St Columba, the Irish monk who first brought Christianity to Inverness.
The Old High Church is on the market for offers over £150,000 The first minister of the united charge was the Reverend Peter W Nimmo, who was inducted in August 2004.
Rev James Bissett, an Ordained Local Minister, is currently serving as locum for the united charge.