Do i need planning permission or anything for my garage?

Do i need planning permission or anything for my garage?
I had a garage built onto the side of my property last year. It's a small house and small garage. Next door already had a garage so I basically had to add a front and back then add a roof. Breeze block only without foundations.
I am in the process of selling the house and am worried I needed permission. The lady buying the house does not need a mortgage so I'm not sure it will even come to light.
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