The council offers advice to anyone who faces losing their home or are in urgent housing need http://www.rushmoor.gov.uk/homelessness
You can report a rough sleeper to the council so they can try to help them
https://www.rushmoor.gov.uk/article/10441/Report-a-rough-sleeper
Step by Step offers a service to help under 25’s in areas such as housing, homelessness, money and deby management, relationships and employment https://www.stepbystep.org.uk/youth-aims
The Vine Centre supports the vulnerable and homeless in Aldershot, and you can get involved to help, donate money or find out what hey do on their web site http://www.thevinecentre.org.uk/