I've met both usages:
I've also notices that some write barber's shop.
Are they different in UK and US and which one prevails over the other?
If I wish to say that I want my hair cut, do I say?
- I want to cut my hair, I need to see a barber!
- I want to cut my hair, I need to go to the barbershop (barber's shop, barber shop)!