Project Incomplete Before End of Performance Period

The project should still be eligible to certify, but you won't be able to count the value of the materials purchased later than the performance period. Another option would be to extend your performance periods - see the notes above in the LEEDUser Birds Eye View for having different performance periods for different credits - can be up to 24 months long, purchases can be made before the performance period, periods can start at different times but need to periods need to end within a 30 day window. Extending the performance period for all the other credits to coincide with the completion of this one credit might be too onerous, so you might want to use just the portion of construction materials purchased before and during the planned performance period. Any pre-ordering of materials will only help.