Delamination under a window is an easier repair than a side wall delam because the window can be removed wedges inserted to dry the area and check for any rotted structure, and can be clamped after adhesive is applied. I would use it to negotiate a lower price if owner will not lower the price move on. If you want to repair these areas do a search under Gjac and delamination and you will see a detail description of what I did to repair mine. I would do a small area under the window repair any day but would not attempt a side wall repair again where I had to use the side of a building to apply pressure to the repair. Of course the older that I get the less repair I want to do.