Book of Building is one of the useful Books in COC. But to get a Book of Building is difficult.
Thus after getting one you should know what you can actually upgrade with help of it. That’s why we have provided the list of items you can upgrade and cannot upgrade by using Book of Building.
Can be used to instantly Upgrade:
Book of building can be used in both villages to instantly upgrade Spell Factories, Elixir Collectors, Dark Elixir collectors, Dark Elixir storage, Elixir storage, Gold Mine, Gold storage, Army Camp, Air Sweeper, Clan Castle, Town Hall, Hidden Tesla, X-Bow, Inferno Tower, Eagle artillery, Scattershot, Bomb tower, All traps, Most buildings in Builder Base.
Cannot be used to Upgrade :
Battle Machine, Archer Queen, Barbarian King, Royal Champion, Both village Troops.
have any question then don’t hesitate to ask in the comment box.