Bangor University has admitted that an arts centre being built by Miller Construction will not be ready until next year.
The Pontio building was due to hold an opening gala next month, but the Welsh university said building work scheduled for completion last month was yet to be finished.
It added that it was working with Miller – now part of Galliford Try – to finish the building in time for performances to commence in February.
Bangor University vice-chancellor professor John G Hughes said: “Following detailed discussions with the contractor I have taken the difficult and painful decision to postpone the artistic programme scheduled in the Pontio building until February.
“I fully recognise everyone’s disappointment at this further delay, but given the delays in the building schedule to date we have no other choice.
“The building was due to be completed in sections, with the first section to be ready by 22 August, however we are still waiting for this work to be finished.”