Frame stuck to glass with silicon and wedged window up with glass spacers - is this normal practice?

no

Hello, Are these pvc windows ? If they are then this is not good practice . If the opening sashes are have trouble closing the to a certain extent you can 'toe and heel ' the glass but this is done with packers so any water that gets past the seal can drain out through weep holes . Can you take a picture ? If there timber windows then mostly you silicone around the glass to create a water proof seal . But you also should have packers under the glass and the bottom bead should have drainage or weep holes . Hope this helps , please if possible upload a picture

Good morning This is very unprofessional work that has taken place and I recommend if you’ve been given a warranty to look further into getting it replaced this is not safe. We hope this helps you out Thankyou Glass Shield UK

No it’s not common practice, it seems like they are unprofessionally trying to put your job to bed by throwing silicone at it. Firstly they should toe and heel and then use proper wedge rubber gaskets for the seal. By using silicone they are stopping the drainage system within the frame from being effective. This will cause more issues down the line with water ingress.