Do I have to pay for packaging of custom glass?

Only if you choose packaging yourself. Packaging is not needed for transport, so by default you pay nothing for it.

Do you still want your glass or mirror packed, for example because you still have to move or store it yourself? Then you choose packaging as an extra option with your order. This is possible up to a size of 1000 x 2000 mm, and you can see the cost in the configurator.

Why we deliver custom glass and mirrors unpacked by default is explained in why custom glass is not packed.