To ask my DS to pay rent/housekeeping?

[Oregghiette]

He has OCD. He is not in full time education. He doesn't cook or prepare his own food (one of the effects of his type of OCD meant he has suffered an eating disorder) so I make all his food, even snacks. He wastes food if he deems it to be contaminated. I do at least one wash per day. He doesn't help with any housework. I think I must spend more than average on cleaning products and dishwasher tablets etc. He pays separately for his own toiletries. I can't work full time because he wouldn't eat properly. He has been ill for 10 years and under CAMHS but is now over 18. I am a single parent.

AIBU to ask him to give me a percentage of his PIP payment?

Of course you're not unreasonable, he's an adult - he should contribute and he's costing you extra.
I don't see why you're letting this stop you from working full-time; he needs to handle this disorder himself - what happens when you're no longer there? Maybe cook him a substantial evening meal - he won't starve if he doesn't snack!

Have you applied for carers allowance OP? Considering you're unable to work full time due to caring for your son.

I second what a previous poster said about applying for a carers allowance.

I'm not eligible for carers allowance because it's means tested.
He's only recently turned 18. If he was still in education then I don't think it would be reasonable to charge rent, but he gets PIP because he has a disorder and can't work or attend college. He may be able to get UC. I'm really only just getting used to the fact that I'm not legally responsible for him anymore. Which was why I was working part time. With SS and CAMHs appointments, and being woken in the night due to his panic attacks there was no way I could be full time in a responsible position. It's bean really hard finding the balance between caring and enabling.

He gets PIP for his expenses. Rent, food, other bills...

You are definitely not unreasonable to charge him for those things.

I think he should be claiming UC too. No, I don't think you are unreasonable to ask for a contribution.

He has done the online application for UC but needs to go for an interview and because he struggles to leave the house is a bit stuck. I have explained that he is an adult now and that if he wasn't living at home he would have to pay for his living expenses out of his benefits. So actually me working full time or not is irrelevant. Even if I was and had more than enough money he should be contributing. It all seems a bit clearer now.