Competitive badminton follows the Badminton World Federation (BWF) Laws of Badminton. Matches are best of three games, each played to 21 points with rally scoring, a two-point winning margin, and a cap at 30. Players must serve below 1.15 meters, avoid touching the net, never hit the shuttle twice, and accept the decisions of the umpire and line judges. Good competitive etiquette means calling lines honestly when there are no line judges, keeping play continuous, respecting officials, and treating opponents with courtesy before, during, and after the match.
This guide covers scoring and match structure, the most common faults, lets, service rules, the roles of officials, misconduct and cards, and the etiquette expected at club leagues and tournaments.
Scoring and match structure
| Rule | Detail |
|---|---|
| Game | First side to 21 points wins, with a margin of at least 2 |
| Cap | At 29-all, the side scoring the 30th point wins the game |
| Match | Best of three games |
| Rally scoring | A point is scored on every rally, whoever served |
| Intervals | Up to 60 seconds when the leading side reaches 11 points; up to 2 minutes between games |
| Change of ends | After each game, and in the third game when the leading side reaches 11 points |
| Serving court | Right service court when the server’s score is even, left when odd |
Common faults
Out or into the net. The shuttle lands outside the boundary lines, fails to pass over the net, or passes through or under it.
Touching the net. A player touches the net or its supports with the racket, body, or clothing while the shuttle is in play.
Reaching over the net. A player hits the shuttle before it crosses to their side. Following through over the net after hitting it on your own side is allowed, as long as you do not touch the net.
Double hits. The same player hits the shuttle twice in succession, or both doubles partners hit it one after the other.
Carrying or slinging. The shuttle is caught and held on the racket and then slung during a stroke.
Hitting a player. The shuttle touches a player or their clothing.
Obstruction and distraction. A player obstructs an opponent’s legitimate stroke or deliberately distracts them, for example by shouting or making gestures.
Touching the ceiling or walls. The shuttle hits the ceiling or side walls, subject to any local venue rules.
Service rules
Height. The whole shuttle must be below 1.15 m from the court surface at the moment of contact.
Feet. Part of both feet of the server and receiver must stay in contact with the floor, in a stationary position, until the serve is delivered.
Continuous motion. Once the server starts the forward swing, it must continue without stopping or feinting.
Base first. The racket must first hit the base of the shuttle.
Diagonal. The serve must travel diagonally into the correct service court.
No undue delay. Neither server nor receiver may delay the serve once both are ready.
Lets
A let stops play and the rally is replayed, with no change to the score. Common reasons include:
Receiver not ready. The server serves before the receiver is ready, provided the receiver makes no attempt to return it.
Shuttle caught on the net. The shuttle gets caught on the net or stays on top of it after passing over, except on the serve.
Shuttle disintegrates. The base completely separates from the rest of the shuttle during play.
Unforeseen interruption. Something unexpected interferes, such as a shuttle from another court landing nearby.
Undecided call. A line judge is unsighted and the umpire cannot make a decision.
Officials and their roles
Umpire. Controls the match, calls the score, and makes final decisions on points of fact during the match.
Service judge. Watches the server and calls service faults.
Line judges. Call whether the shuttle landed in or out on their assigned line.
Referee. Has overall responsibility for the tournament and handles appeals on points of law.
Without officials. At many club and league matches there are no officials. Players call the score and their own lines, and disputed calls are usually replayed.
Misconduct and cards
Umpires can penalize misconduct, such as deliberate delays, abusive language, damaging equipment, or unsporting behavior. A yellow card is a warning, a red card gives a fault to the offender’s side, and a black card, issued with the referee, means disqualification. Players may not change shuttles or leave the court without the umpire’s permission, except during intervals.
Doubles-specific rules
One serve per side. Under rally scoring, each side has one service turn; if the serving side loses a rally, the serve passes to the opponents.
Changing service courts. The serving pair switches service courts only after winning a point on its own serve. The receiving pair stays in the same courts.
Service court size. Doubles serves must land between the front service line and the doubles long service line, which sits 0.76 m inside the back boundary.
Only the receiver may return the serve. If the receiver’s partner hits the serve, it is a fault.
Competitive etiquette
Before the match. Arrive on time, introduce yourself, shake hands, and warm up cooperatively by hitting shots your opponent can return.
During the match. Call lines on your own side honestly and give the benefit of the doubt when unsure. Announce the score clearly if there is no umpire, return the shuttle to the server politely, and avoid long delays between rallies.
Respect officials. Accept decisions calmly. If you disagree, speak politely to the umpire; arguing rarely changes a call and can lead to a card.
After the match. Shake hands with opponents and the umpire, collect your belongings, and leave the court promptly for the next match.
In doubles. Support your partner, communicate respectfully, and avoid visible frustration.
Common mistakes in competitive play
Not knowing the service rules. Many club players are faulted for serving too high or moving their feet.
Calling lines on the opponent’s side. Without line judges, you normally only call your own side.
Delaying play. Excessive towel breaks or shuttle testing can draw warnings.
Touching the net on follow-through. Even after a winning shot, touching the net while the shuttle is in play is a fault.
Arguing with officials. This can lead to cards and distracts you from the next rally.
A note on the rulebook
This guide summarizes the BWF Laws of Badminton, which are updated from time to time. National associations, leagues, and schools may adapt some rules, such as service height or scoring formats. Always check the current rules for your competition, and ask the referee or organizer if you are unsure.
Frequently asked questions
What happens at 20-all in badminton?
The game continues until one side leads by 2 points. If the score reaches 29-all, the side that wins the next point wins the game 30-29.
Can you touch the net in badminton?
No. Touching the net or its supports with your racket, body, or clothing while the shuttle is in play is a fault.
Can your racket go over the net in badminton?
Yes, but only on the follow-through after you hit the shuttle on your own side, and as long as you do not touch the net.
