In Evony you get 22 building spots inside each of your town. It is very essential to have as much barracks as possible to generate troops much faster. So, you have to know which building can be replaced with barracks and when.
I am explaining which buildings you can delete and when you can delete them.
Market - You should keep a market in one of your city and delete them from the other cities. You buy buy resource in that city and send them other cities.
Inn - Inn is the place where you can recruit heroes. You can recruit heroes from the...