What faults can happen during a rally?

Under Law 13.3, it is a fault (and the other side wins the rally) if the shuttle:

• lands outside the boundaries of the court
• fails to pass over the net, or passes through or under it
• touches the ceiling or side walls
• touches a player's body or clothing
• touches any other object or person outside the court
• is caught on the racket and then slung during a stroke
• is hit twice in succession by the same player (hitting it with the racket head and strings in one stroke is not a fault)
• is hit by a player and then their partner in succession
• touches a player's racket and does not travel towards the opponent's court

Halls with low beams or other obstructions may have a local rule (a "bye-law") about the shuttle hitting them, so a league or club can vary the ceiling rule for its venue.