Developmental, Line and Copy Editing: Who Does What and What It Costs
A developmental edit looks at the book (structure, characters, pacing), a line edit looks at the sentence (style, rhythm, voice), and a copy edit looks at the page (errors, consistency, house style). They are billed in different units, they happen in that order, and the first costs several times the last, because it means reading the novel like an editor rather than a proofreader. Here is who does what, how to read a quote, what an AI coach replaces (the first filter) and does not (the human), and which levels are worth paying for depending on your publishing plans.
The three levels, on the same paragraph
The simplest way to tell them apart is to look at what each one writes in the margin of the same passage. From the fictional novel "The Last Round", chapter 14, before revision:
Solène set the bag down on the kitchen table. It had been raining since morning. She put water on to boil, looked out of the window at the church roof, thought about Nadia, about the city, about everything she had left behind. Then she took out the letter. The envelope was blue, slightly warped by the damp. She turned it over several times. Finally she opened it.
| Level | What it looks at | Margin note on this passage |
|---|---|---|
| Developmental | Structure, arcs, stakes, pacing of the whole book | "First opened letter at 52% of the text: this is your pivot, and no stakes are set for it. What does she risk? The reader must know beforehand. See also chapters 11, 12, 15: nothing changes." |
| Line | Sentence, rhythm, voice, imagery, dialogue | "Five sentences out of seven start with 'She'. 'Thought about Nadia, about the city, about everything she had left behind': a triplet that pads. 'Finally' weakens the gesture." |
| Copy | Errors, agreement, punctuation, consistency of names and dates | "Nothing on this passage. Ch. 9: 'day 90' in figures, 'day ninety' elsewhere. Ch. 21: Yann's eyes are blue, grey in ch. 5." |
The first said nothing about the sentence, the third nothing about the plot. That is normal: paying for a copy edit and hoping for an opinion on the sagging middle is the most common disappointment among authors who order "an edit" without saying which one.
How to read an editor's quote
Rates vary widely from one professional to the next; a price grid would be wrong within six months. What does not change is the billing unit, and that is what you compare.
In the United States and the United Kingdom, copy and line editing are most often billed per word or per standard page of 250 words; developmental editing is usually a flat fee for the whole manuscript, sometimes hourly. In France, the common unit is the "feuillet" of 1,500 characters including spaces. Reedsy, which sells a marketplace of editors, shows per-project quotes; Novlr explains the levels without numbers.
Three questions to ask before you sign:
- Which level, exactly? A quote that says "full edit" with no detail should be sent back. Ask for a two-page sample edit so you can see what the margin will contain.
- How many passes? A serious copy edit does two. A line edit does one, followed by an exchange on your responses.
- What is delivered? A file with tracked changes, an editorial letter (for a developmental edit, often ten to twenty pages), a call.
To compare two quotes, bring everything back to the whole manuscript: 80,000 words is 320 standard pages, or about 480,000 characters. A per-word rate and a per-page rate become comparable with one multiplication.
What an AI coach replaces, and what it does not
The honest answer: it replaces the first filter, not the professional.
The first filter is everything a human editor would charge you to point out that you could have seen yourself: the empty middle, the stakes set after the gesture, the five "She", the eyes that change colour. In the Sagoræ workshop, Dédale reads the outline and flags the chapters where nothing changes; the Archivist compares the profiles to the text; Théo asks a scene the questions a line editor would ask; the AI Checker explains the rule behind an error the built-in checker (no AI, free, unlimited) has underlined. None of them rewrites a sentence.
T Theo · Scene critic Pre-recorded demo
Theo reads chapter 7 of "The Night of the Hourglasses"
Theo
I see why it feels flat. The scene you have been promising for three chapters (the reunion) is summarised in one sentence: "They talked for two hours". The reader is waiting for exactly those two hours, and you take them away.
Three things I notice:
- The tension is gone by the second line. "Exactly as she remembered him" reassures immediately. What has changed in Elias that Iris did not expect?
- Nobody wants anything in the scene. What has Iris come for, concretely? An answer, forgiveness, money? Without a goal, the conversation can neither succeed nor fail.
- The first exchange does not exist. The first sentence Elias says after six years is worth more than a summary of two hours.
Theo
Then you already have your scene: a request she does not dare to make, in front of someone who is expecting it. Two questions to rewrite it (I will not do it for you):
- At what exact moment does Iris say the word "trial"? Everything before that word is tension; everything after it is conflict.
- What is Elias doing with his hands while she talks? One concrete gesture will do more than "he looked up".
Keep the night falling as she leaves, it is a good closing image. But let it fall on a refusal, not on a summary.
Pre-recorded simulation of an exchange with Theo. The chapter text stays the author's: Theo never rewrites a line of it.
What they do not do: read with a market in mind, put their name on the line, negotiate with you, tell you that this is not the novel you should be writing right now. A human editor does those four things, and that is what you pay for. Arriving with a manuscript that has already been through the first filter changes what the editor can do with the time: instead of flagging your repetitions, they work on your ending.
The method for running that first filter yourself, in four ordered passes, is laid out in how to edit your first draft: a 4-pass method. And if you are weighing a classic grammar checker against one that reads style, the comparison of grammar checkers for fiction writers shows what each one sees.
What to pay for, depending on your project
| Your project | Developmental | Line | Copy |
|---|---|---|---|
| Querying agents or publishers | Useful if you already have detailed rejections; otherwise beta readers and a coach are enough | No: the publisher will do it their way | Yes, one pass: an error-ridden manuscript is set aside before it is read |
| Self-publishing with commercial ambition | Yes, this is where money changes the book | Yes if the budget allows; otherwise coach plus a tight reread | Yes, two passes, non-negotiable |
| Family book or private print run | No | No | Yes, or a careful reread by a demanding friend |
| First manuscript, project still vague | No: save the money for the second one | No | Not yet |
The self-publishing row is the only one where all three levels are justified, because nobody else will do them. The choice between the two routes, with what each asks you to pay and to give up, is developed in self-publishing vs traditional publishing.
In every case the order stays the same: beta readers, developmental if you pay for it, line, copy last. Paying for a copy edit before a developmental edit means paying twice: the second will cut whole chapters that were already corrected. The role of trusted readers before any professional, and the questionnaire to hand them, are in how to find beta readers.
Frequently asked questions
How much does a book editor cost? It depends on the level (developmental, line, copy) and the unit (word, page, feuillet, flat fee). Always compare quotes brought back to the whole manuscript, and ask for a sample edit before signing.
Do I need to pay for editing before querying a publisher? A copy edit, yes: errors get a manuscript set aside before it is read. Developmental and line editing, no: the publisher will do them with you if they take the book.
Can an AI coach replace an editor? It replaces the first filter: inconsistencies, repetition, empty chapters, missing stakes. It does not replace a professional who knows the market and puts their name on the line.
In what order should the three levels happen? Developmental, then line, then copy. Reversing the order means paying twice for work on passages that will be cut.
If you want to run the first filter yourself before paying anyone, Sagoræ offers a free trial, no card required.
✒️ Read next: How to Write Your First Novel: A Guide That Shows Instead of Tells · How to Start Writing a Novel With No Experience: Your First Week, Hour by Hour · 12 First Novel Mistakes and How to Catch Them Before Your Readers Do
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