How old are they? The Foyer Federation provides supported accommodation for people 16-25 years old, check availability in their current area/the area they were living before.
Browse our UK network of Foyers and search our member service directory
www.foyer.net
Or if they're LGBTQ+ they might find the Albert Kennedy Trust helpful.
"We support LGBTQ+ young people aged 16-25 at risk of, or experiencing, homelessness, or living in a hostile environment. Our centres are open for referrals in Manchester, London, Newcastle and Bristol. We offer digital support across the UK. Our Live chat is open to offer remote support to those living elsewhere in the country."
If you identify as LGBTQ+ and are aged 16-25, we can help you find a safer living situation. We help LGBTQ+ young people out of homelessness.
www.akt.org.uk
They could possibly be classed as at risk of homelessness if their relationship with their parents is breaking down. Crisis might be able to help them.
Gender comes into it too, in that there's probably more support and hostel places for women, who are seen as more vulnerable and at risk when it comes to street homelessness, men are often left to fend for themselves.
If they're a woman and their relationship breaks down, they might be able to get a place in a hostel and then help getting rehoused.
In the first instance, many councils will put people off applying to go on their housing list.
(Around 20 years ago, when I was homeless due to a relationship breakdown and having worked away and returned back to the UK, when I phoned to enquire I was originally told that I'd be one the housing waiting list for nine years before getting anything. After sofa surfing with friends for a bit, my mental health tanked and I ended in a women's hostel for five months before being offered a council flat. But they originally assessed that they had no legal duty to rehouse me - until I looked up the law and challenged them, because care leavers are classed as vulnerable; I also helped some women in the hostel challenge their decisions because they'd just been released from prison, so should've been assessed as the council having an obligation to help them but they were originally told the council had no obligation to house them. I think the hostel staff hated me for challenging their bullshit, but it was appalling.)
Basically, your friend might need help challenging bullshit decisions. So look up the law centres network, if there's a law centre nearby, they might be able to get legal help re housing issues.
You mentioned they receive PIP. If they have any mental health issues, then the advice workers at Mind can be very helpful in terms of helping to apply for benefits/make sure people get all the benefits they're entitled to. They might also be aware of any local services that might help homeless people/people at risk of homelessness, any tenancy deposit schemes, help furnishing a new place, etc.