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The client wanted some changes in the last minute and design was revised.
Nothing new, every project i work, in philippines, KSA and here in QATAR design changes are usual. Impact depends on the how it will affect the Project Schedule, the more time it will affect and how much activity it will affect- the more the delays create impact to the Project schedule.
Every delays have a cost in WBS.
To recover delays, PERT-CPM are needed to refered just to jump in other acitivities which will not affect by the design changes.
If the design changes are severe,then a more serious approach to the problem.
If the changes is iniated by client there is nothing to worry. Unless construction failures are done by contractors that leads to design changes.