Charging for source code

Hey!

I’m currently paying an app developer to create an app for me. I was interested in having the source code. (Incase I need it for whatever reason) and I’ve been asked to pay for it?

If this is the norm that’s fine, I just need clarification.. surely if the app I’ve asked to be made is mine and the person I’ve paid to make it has made it for me I should also have the source code rather than essentially pay again to have the code?

🙂