A blog is a strange kind of treasure. You have years of posts, a small readership that actually turns up, and a nagging suspicion that there is a book somewhere in the pile. A collection of good posts is not a book, though, and it is certainly not a proposal. The work that turns one into the other is mostly editorial: finding the argument running beneath the individual pieces, cutting everything that only made sense on a Tuesday, and presenting the result in the shape agents and commissioning editors expect to see.

This is the route a great deal of useful non-fiction takes. You build a voice and an audience in public, then approach a publisher with evidence that the material already works.

Why your blog is a stronger starting point than it feels

Writers routinely undervalue what a blog gives them. You know your reader — not an imagined demographic, but real people who have emailed you, argued with you in the comments and quoted you back at yourself. You know which ideas land, because a handful of posts will have done noticeably more work than the rest. You have already tested the tone you want to write in, which is harder to fake across a whole book than most people assume.

What a blog cannot do is carry a book's structure. Posts are episodic by nature. Each one reintroduces its subject, makes a single point and lands a neat ending. A book needs escalation: an opening that raises a question, a middle that complicates it, a final chapter that earns its conclusion.

Find the spine before you write a word

Pull the ten or fifteen posts that mean the most to you — not necessarily the most-read ones, the ones where you said something you still believe. Summarise each in a single line on an index card, spread them out, and look for the connection.

Almost always, the same question is being answered from several directions. That question is your book. Everything else is a chapter or a cut.

Three useful tests:

• Can the argument hold for the length of a book without repeating itself?
• Can you describe the reader in one sentence without using the word "anyone"?
• Would a stranger want to read chapter two after finishing chapter one?

If any answer is no, the spine needs work before the proposal does.

Sorting the archive: keep, rewrite, cut, add

Go through the back catalogue with a cold eye and put each post into one of four piles.

• Keep, lightly edited. An original argument, a story only you can tell, practical steps someone could follow. These become your strongest chapters.
• Rewrite. Anything written to attract search traffic, or that opens by defining its subject. Blogs explain; books argue. Strip the throat-clearing and start mid-argument.
• Cut. Posts tied to a news cycle, a platform, or a point you have made better elsewhere. Repetition is the classic failure of blog-to-book projects.
• Add. A book needs an opening that sets up the whole argument, transitions between chapters, and an ending that resolves something. Expect more new writing than you planned for.

Keep a running note of anything you have never said in public. That material is often the reason someone buys the book rather than reading the archive for free.

What a non-fiction proposal actually contains

Proposals vary by publisher and genre, so check the requirements of whoever you are approaching and adapt. Most trade non-fiction follows a similar order.

1. Overview. One or two pages: the argument, the reader, why now, why you.
2. Market and audience. Where the book sits on a bookshop shelf and who already buys in that section.
3. Comparable titles. Three to five recent books, with a line on what each does well and how yours differs. Choosing titles that are far too big or far too old weakens this section.
4. Chapter outline. A paragraph per chapter, in order, showing progression rather than a list of topics.
5. Sample material. Usually one or two chapters.
6. About the author. Your readership, speaking, teaching and professional background — anything that shows you can reach people.
7. Promotion. Specific, believable plans. If you will write a newsletter, say how many subscribers it has.
8. Length and delivery. An honest word count and a realistic date.

The proposal is a sales document

It is easy to forget, mid-draft, that this is not a sample of your prose style. It is a case for the commercial sense of publishing you. Clarity beats elegance everywhere except the sample chapters, where your voice does the arguing.

Make the sample chapter earn its place

Send your best chapter, not your first. If your opening chapter is all setup, use the one that shows how you handle a difficult idea, a real example and a scene. Two chapters, thoroughly revised, beat five rough ones.

It is perfectly acceptable to reshape a strong blog post into sample material — just make sure it no longer reads as though it was written to be skimmed on a phone.

Approaching UK agents and publishers

For trade non-fiction, most large publishers expect an agent to bring the proposal to them. Agents publish their submission guidelines online, and those guidelines are instructions rather than suggestions: word counts, what to attach, whether to paste text into the email. Follow them exactly and send what they ask for, no more.

Simultaneous submissions to agents are usually acceptable; check each agency's policy and say so if asked. Your covering letter should be one page: what the book is, who it is for, why this agent, what is enclosed, and the word count.

If an offer arrives, have the paperwork read by someone who knows publishing contracts. The Society of Authors offers contract advice to members, and a specialist solicitor is worth consulting on anything substantial. Terms are negotiable more often than new authors expect. This is general guidance, not legal advice.

Your first week

You do not need a finished manuscript to begin. Start with the one-page overview, because it forces the spine into a single argument and shows you immediately where the gaps are. Then build the chapter outline, then write the sample chapter.

Block out the week: two sessions to choose the spine, one to draft the overview, one to find comparable titles, one for the outline, two for the sample. At the end of it you will have something you can send, and a far clearer view of the book than the archive ever gave you.

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