A decision on whether Costa will be able to build a third cafe in Dumbarton is now not expected until August.
The coffee giants had planning permission for a new drive-thru store in the car park of Morrisons in Dumbarton refused by councillors last year, however they appealed the decision with the Scottish Government.
A response to the appeal was due by last Monday, however that has now been delayed by the Department for Planning and Environmental Appeals (DPEA).