homlesseness

hi  i have an autistic 25yr old son who only got diagnosed when 20 although he went to camhs for 4 yrs and evidently was text book autistic  he has lived in two assisted living accommodation that have been no help and actually caused some serious mental health issues that are to be determined i cannot send him back to live with other people and now i am wondering how to raise money for a purpose built extension on the side of my home so he can feel safe an secure   and i am asking for some signposting and advice really i work as a  dementia coordinator lead in a care home and have done my job for 14 yrs i love my job but unfortunately this means i am not there for my son as i should be to help him i have been on the phone for 3 hours trying  to ring the funding group and there was only 3 ahead this being said is why its impossible for me to do the leg work with working 5 days mon to fri any help would be appreciated