I decided to redo my website with a new domain and look. I had previously been accepted by google adsense and had ads on my site. Will I need to reapply with the new domain or just use the same ad codes from my previous domain?
No, once you have an Adsense account you can use it for all your domains. Don't worry about reapplying!
You don't need to re apply with your new domain as you already got approved by them. But make sure that your new site is fully comply with Adsense policy and quality requirements.