Sitcom Structure: How a Half-Hour Episode Works

A sitcom isn't a movie squeezed into thirty minutes. It's a story machine. You take a character with a very specific dysfunction, put them under pressure for about 32 pages, let everything go wrong in the most satisfying way possible, and then reset so you can do it again next week.

Most of what makes a half-hour work is structure. Here's how I build one.

Start with a story goal

Every episode starts with your Star wanting something concrete. Not "to be happier." Something you could film: win the bet, get the apartment, make the boss laugh, get through dinner without anyone finding out.

Then, early in the episode, make sure we know what success would look like and what failure would look like. That sounds obvious, but it's the thing most drafts skip. If the audience doesn't know what winning and losing mean, nothing in the episode can surprise them, because there's nothing to subvert.

And make the consequences real. One of the first TV notes I ever got was that the stakes in my episode were fake. If the plan failed, nothing would actually happen to anyone. It's a brutal note, and it's usually right.

Write the whole episode in one sentence

Before I outline, I write the entire episode as one sentence of about 65 words. It has to include:

• Who wants what, and what they do to get it.
• Who's in the way, and why.
• The relationship issue underneath, the thing the plot is really pressuring.
• Two turns. Each turn is the Star trying something and the antagonist countering it.
• How it ends.

That's four actions minimum: Star acts, antagonist counters, Star acts again, antagonist counters again. If you can't find four, you don't have an episode yet, you have a premise.

Here's a made-up example: Desperate to prove to his ex that he's moved on, Dev brings a date to her wedding, but the ex seats them with her mother, who still adores Dev. So Dev gives a toast about how great his new life is, and the ex answers by tossing her bouquet straight to his date, who catches it, and the best man asks her out in front of everyone.

Want, obstacle, two turns, a relationship issue (he hasn't moved on at all) and an ending that's worse than anything he feared.

Thesis in, antithesis out

Here's the rule that makes half-hour acts work: each act goes in on the character's plan and comes out with that plan reversed.

The Star enters an act with a clear tactic, the thing they believe will get them what they want. By the end of the act, that tactic has blown up in a way that makes the problem worse and forces a new plan. Every act break is a dilemma.

A few habits that help:

• Restate the goal at the top of every act. It feels repetitive when you write it. It doesn't feel repetitive when you watch it. The more script time you spend reminding us what matters, the more the reader gets it.
• Open and close each act on the A story. The B story lives in between.
• Land the act-out on a joke if you can. A dilemma and a laugh at the same time is the sweet spot.

The shape of a half-hour

• Teaser (2 to 3 pages): sets up the episode's problem and the Star's want, ideally with a red flag that tells us trouble is coming. More on that in the cold open post.
• Act One (about 10 pages): the first tactic, the first turn, and an act-out that makes things worse.
• Act Two (about 10 pages): a new tactic and a bigger reversal.
• Act Three (the longest, about 11 pages): the comic block, the fallout, and a short tag.

Inside each act, the A and B stories usually alternate, something like A, B, A, B, A, with the A story getting more scenes. For the bigger picture on half-hour pilots specifically, see how to write a TV pilot.

The comic block

This is the part most screenwriting advice skips, and it's the heart of a comedy episode.

The comic block is the moment the Star's goal becomes impossible to pursue. Either it's denied for good, or, better, it's granted in a way they absolutely did not want. It's the crisis of the episode, and whatever scramble comes after it is the climax.

To find yours, ask: what's the most devastating thing I could do to a character who wants this? Then do that.

A few things make a comic block land:

• The Star's own misbehavior causes it. The universe of a sitcom rewards bold choices and punishes bad ones. If the block comes from bad luck, it's just unfortunate. If it comes from the character's own scheme, it's funny, and it's fair.
• The storylines collide. The best blocks happen when winning the A story wrecks the B story, or the B story barges into the A story at the worst moment. Seinfeld made a whole art form out of separate storylines crashing together at the end of an episode.
• It goes where the character fears most. The block should carry the biggest consequences in the episode.
• The Star is active in it. If the block happens while your lead is standing there watching, you've lost your ending.

And whoever has the most to lose in the comic block? That's your protagonist. If it isn't the character you thought it was, that's worth knowing.

After the block

The last few pages are where the episode reveals what it was really about. Often it's a small moment where the character finally sees, or says, the real reason they did all this. That's where a character's paradox does its best work.

Running gags help here, too. Set a joke up, repeat it, and then flip it the last time it appears, so the final repetition shows that something has changed. Three beats is usually right.

Scene rules I live by

• No conflict, no scene. If a character's pursuit in a scene doesn't backfire, cut the scene.
• Two pages is a red flag. Most sitcom scenes do their job faster than that.
• Nobody storms out. Storming out ends the conflict. Keep them in the room.
• Realizations need something physical. A character changing their mind should do something we can see.
• Montages are filler. In a half-hour, they're usually covering for a missing scene.
• Keep the antagonist present. They, or the threat of them, should be felt in nearly every scene.

How I write the pages

I plot backwards and script forwards. I figure out the comic block first, then work backward to set it up. Then I write the script from page one.

And I write each scene in three passes. First the data: what has to happen, said bluntly. Then the jokes, which usually come from how the characters see each other. Then I go sideways, burying what they mean under what they actually say. If that last step is the hard one, the subtext post is for you.

Common sitcom problems

• A vague story goal. If we don't know what the Star wants this week, we can't root for or against them.
• Fake consequences. If failure costs nothing, nothing is funny.
• Disposable scenes. Scenes where nothing changes because of what happened.
• Storylines that never touch. Two separate episodes sharing a running time.
• Plots that depend on a character being dumb. If one honest conversation would solve the whole episode, readers will notice.
• A passive Star in the comic block.

Get a read on your episode

Auteur reads half-hour pilots and specs with the same 20-category grid and page-specific notes on structure, pacing and character as a feature. Send us your script and you'll have coverage back in minutes.