Disabled son smashing windows

[Justme02]

Hello all ,im looking for some advice and help please as I just cant think what to do.My son is severely autistic and cant stop furiously hitting his hands and head on the windows of our house.hes been doing this for over a year now and theres no distracting him,he is non verbal with learning disabilities and is mentally aged 6 months ,so theres no reasoning with him.

The windows are kite marked double glazed and I've had them checked and been told its unlikely he will be able to go through them.ive bought protective shatterproof filming just in case and applied on all.
I've looked on the internet for anything which would stop the noisy banging he seems to enjoy from the windows but cant find anything.

The noise is deafening and distressing. I dont know what would work apart from padding all the windows and having no light which I obviously dont want.
I've asked all services and they haven't came up with a solution,so hoping maybe some new ideas will come from here.
im so stressed about it,its non stop all day long.

Could occupational therapy suggest anything ?I also have a severely autistic non verbal son ,although thankfully he doesn't do this but an OT came out when !y son kept climbing out of the Windows and got us window locks etc ,they may have some ideas?

Do you know what triggers it? My son who has asd went through a phase of hitting himself amd it turned out he was in pain from an ear infection. When this was treated the hitting stopped.

It could be that he is seeking sensory stimulation. Does it happen at particular times of day or after particular types of activity? Have you tried giving him safer replacement activities he could engage in. For my son flinging himself down on a trampoline helps.

Alternatively it could be attention seeking/to get a reaction. This is hard to deal with. I was told to use the abc approach, anticedent/behaviour/conseqence i.e look at what the triggers are and reduce them and if the behaviour does happen make sure any consequences of the behaviour doesn't make him want to do it more e.g to get a reaction.

Good luck, it is really tough, I have been there.