I do not have access to the administrative email for my domain name. Can I still transfer the domain to you?Unfortunately it is not possible to transfer your domain name to Siteground when you don't have access to its administrative email.
There is a basic ICANN requirement which explicitly denies such actions and no registrar can make excpetions to it.
Please contact your previous registrar / host as they are the only authority that can help you with this matter.