How to apply Windows Firewall depending on location (Home/Work)

Hi,
Here’s our situation: We need to set up a GPO (can’t think of any other option) that would recognize whether the user (using company’s notebook) is at home or at work on our LAN. Based on that, the relevant FW settings will apply.

At home – Internet’s blocked but the connection to our VPN
At work – FW is less restrictive

Anyone has experience with Domain profile/Standard profile settings in domain GPO?
Or can you think of anything else?
Many thanks guys.