In order to make easy a future extension of your kit building (like adding a canopy, a lean-to, etc.), our stock buildings (12,60m, 16,60m and 20,60m wide) have pre-drilled heads of columns.
This counter-drilling is done before the hot-dip galvanization. By so doing, we make sure the galvanization is preserved and the building is protected against rust for a quite long time.
Moreover, with the counter-drilling, you have the opportunity to get your building in a shorter time frame and without any restriction on its area. As a matter of fact, you can further extend the building as you wish, according to the evolution of your activity.