Unlike fiction, most nonfiction sells to agents and publishers on the strength of a book proposal and sample chapters, not a completed manuscript, which means the proposal itself is effectively the product you're selling before the book fully exists. A proposal is closer to a business case than a creative pitch: it needs to prove there's a market, that you're the right person to write the book, and that you can reach that market yourself.
This is part of the Complete Guide to Writing Nonfiction.
A proposal opens with an overview: the hook, the core idea, why this book and why now, typically a few pages, followed by a target audience section naming specifically who this book is for, not a vague "everyone who wants to improve their life." Comparative titles, 4 to 8 recent, relevant books your work sits alongside, show where yours fits and how it's different, and your author bio and platform section covers your credentials and, critically, your existing audience or reach.
Beyond that, a proposal needs a marketing plan covering what you'll actively do to help sell the book, not just an assumption that the publisher will handle it, a chapter-by-chapter outline summarizing the book's full structure (often 100 to 150 words per chapter), and sample chapters, typically one to three polished chapters, sometimes more, demonstrating you can actually execute the book at the quality the pitch promises.
Proposals vary considerably by category and publisher expectations, but most run somewhere between 15 and 50 pages, not including sample chapters, with narrower categories sometimes shorter and more platform-dependent categories sometimes longer. There's no single correct length; the goal is thorough without padding.
For most nonfiction categories, publishers expect authors to bring an existing audience: an email list, social media following, speaking engagements, media presence, or professional reach within a specific community. This is because nonfiction sales are closely tied to the author's ability to reach readers directly, more so than fiction, where the story itself carries more of the marketing weight. If your platform is still developing, be honest about where it stands and specific about concrete steps you're taking to build it, rather than overstating existing numbers.
Comps show agents and publishers that a market exists for your book and where it fits within that market. Choose recent titles (typically the last 3 to 5 years), genuinely comparable in scope and audience, not aspirational bestsellers with little real overlap. For each comp, be ready to explain both how your book is similar and how it's meaningfully different; comps that are too similar can actually work against you by suggesting the market is already served.
Before a full proposal, you typically send a shorter query letter, often one to one and a half pages, covering a brief hook, a summary of the book, your credentials, and a note on comparable titles. If an agent responds with interest, they'll request the full proposal. Query letters are tailored to each specific agent or publisher, following their submission guidelines exactly, rather than sent as an identical form letter to a long list.
Publishers want proof you can actually execute the book at the level your proposal promises, which is what sample chapters demonstrate. These should be your most polished, best-representative writing, not necessarily your first chapters chronologically if a different section better showcases your voice and the book's core value.
Generally, no, for standard nonfiction. Publishers typically decide based on the proposal, your credentials, platform, and the quality of your sample chapters, then work with you on the completed manuscript after acquisition. This differs from fiction, especially debut fiction, where a completed manuscript is usually expected before submission.
A formal proposal isn't required if you're self-publishing, but working through the same exercise, defining your audience, comps, chapter outline, and how you'll reach readers, is still valuable groundwork. It clarifies your book's positioning and gives you a practical marketing head start, even without an agent or publisher to convince. See How to Write a Book Marketing Plan.
Want Feedback on Your Proposal Materials?
Entrada Publishing's beta readers and editors can review sample chapters and help strengthen your nonfiction manuscript, whether you're pursuing traditional publishing or self-publishing.
Generally no. Most nonfiction sells to agents and publishers based on the proposal, your credentials, platform, and sample chapters, with the full manuscript written after acquisition.
Most run 15 to 50 pages, not including sample chapters, though length varies by category and publisher expectations.
Recent, genuinely comparable books that show where your book fits in the current market and how it differs. Agents and publishers use them to assess whether a real market exists for your book.
Because nonfiction sales are closely tied to an author's ability to reach readers directly. Publishers expect authors to bring some existing audience or reach, whether that's an email list, social following, or professional presence in a relevant community.