Novel to Screenplay Adaptation: 7 Common Mistakes Made by Authors

Turning your own novel into a screenplay is exciting, and harder than most authors expect. You know the story better than anyone, but a script works by completely different rules from a book.

We work with authors on adaptations all the time, and the same mistakes come up again and again. Here are the seven we see most often, and how to avoid them.

Mistake 1: Treating Internal Monologue as Dialogue

Novels can spend pages inside a character's head. Films can't. The camera only sees what people do and hears what they say, so thoughts have to become something visible.

Say your novel spends three paragraphs on Sarah's nerves before a job interview. Turning those thoughts into dialogue, or a long voiceover, rarely works. Instead, show it: Sarah checking her reflection for the fifth time, arriving half an hour early, dropping her notes in the lift.

The trick is to turn feelings into behaviour that an actor can play and an audience can read.

Mistake 2: Trying to Keep Every Subplot

A 400-page novel might follow six storylines. A film usually has room for one main story and perhaps one or two smaller ones. A screenplay runs to roughly 90 to 120 pages, at about a minute of screen time per page, so something has to give.

It helps to ask three questions:

• What's the central conflict driving your main character?
• Which other characters are essential to that conflict?
• Which subplots could be merged, or cut altogether?

Cutting things you love is painful. But a film isn't a summary of your book. It's a new version of the same story, told in a different form.

Mistake 3: Ignoring Visual Storytelling Opportunities

Film gives you a chance to replace explanation with pictures, and many authors don't take it.

Take a line like: "James had always been meticulous about his appearance, a habit from his strict military upbringing." On screen you might show his wardrobe with every shirt facing the same way, his nightly ritual of polishing his shoes, or the way he still stands to attention without thinking.

Wherever you can, let the audience see who someone is rather than being told.

Mistake 4: Misunderstanding Screenplay Format Requirements

Screenplay format isn't there for show. It's a working tool that tells directors, actors and producers exactly what happens and when, and it's one of the first things a script reader notices. Scripts use 12-point Courier, set margins and a standard way of laying out scene headings, action and dialogue:

INT. SARAH'S KITCHEN - MORNING

Sarah stares at her laptop screen, coffee going cold
beside her. The cursor blinks on the empty page.

Screenwriting software such as Final Draft or WriterDuet handles most of the formatting for you, but it's worth understanding why the conventions exist, because they shape how you write each scene.

Mistake 5: Underestimating Dialogue Adaptation Challenges

Dialogue that reads beautifully on the page can sound stiff when an actor says it out loud. Spoken lines need to be shorter, sharper and full of subtext, because in real life people rarely say exactly what they mean.

When you adapt dialogue, think about:

• the rhythm of speech, which is different from the rhythm of prose
• what's left unsaid as much as what's said
• making each character sound like themselves
• lines that do more than one job at once

Read your dialogue aloud, or better still, ask friends to read it to you. If it doesn't sound natural, it won't work on screen.

Mistake 6: Expecting the First Draft to Be the Last

A first draft of a screenplay can come together surprisingly quickly. Our own adaptations usually take about two weeks for a first draft, because the story, characters and dialogue already exist in your book.

The mistake is thinking that draft is finished. Most screenplays go through several rounds of changes before they're ready to be made, often after feedback from producers, actors or directors. Treat your first draft as a strong, complete starting point, and expect it to keep developing if the project moves forward.

Mistake 7: Neglecting Professional Industry Standards

The most costly mistake is treating the screenplay as a creative exercise rather than a professional document. If you want producers to take your story seriously, the script has to look and read like the scripts they see every day.

Script readers, the people who assess screenplays for production companies, can usually tell within a few pages whether a writer knows what they're doing. They're looking for:

• correct, modern screenplay format
• a story that could realistically be made
• an understanding of what works in your genre
• a clean, professional presentation

None of this means giving up your vision. It means presenting it in a way the industry can properly judge.

Moving Forward with Your Adaptation

Good adaptation means embracing the differences between a book and a film rather than fighting them. It's translation, not transcription.

If you'd rather not go it alone, we can help. Our novel to screenplay service is £1,200 + VAT for a manuscript of up to 80,000 words. You can also try us first: send us your manuscript and we'll adapt a chapter or scene of your choice for free, with no obligation. Get in touch to claim your free sample.

If you're still at the stage of wondering whether your book would work on screen at all, start with our guide on whether your book would make a good movie.