how much does it cost to repair charger port iphone 7?

Where are you located? You should to bring it to Apple or an AASP for an evaluation and you should receive a quote for the repair price. It may be repaired or replaced - I can't say for sure.

Click below, it will show you different frequent repair topics and how you are able to get your device sent to Apple to have it repaired.

Contact Apple Support

Hope this helps.