How Agency Owners Can Turn Their Experience Into a Business Book (and Which Book to Write)

Every agency owner has a book’s worth of material on a shared drive. Ten years of proposals, won and lost. The pitch deck you rebuild every quarter. Retros nobody reread. Quantity is rarely the problem.

The problem is that “the agency book” means two different books, and owners often start writing one while picturing the other. One is for your clients: the marketing director or founder who has the problem you solve. The other is for people like you: owners who want to know how you price, hire and win work. They use different material, carry different risks and pay back on different timelines.

This guide covers the choice, then client NDAs, work your team wrote, pitches and RFPs, and finding the hours.

Two books share the label “agency book”

	Book for your clients	Book for other agency owners
Reader	The marketing director, CMO or founder who hires agencies like yours	Owners and partners of agencies, often smaller than yours or a few years behind
What it sells	Engagements with your agency	Talks, workshops, advisory retainers, a peer group or course
Core material	Diagnoses, recurring client mistakes, trade-offs	Pricing, hiring, positioning, cash flow, your own mistakes
Biggest confidentiality risk	Client results and data	Your staff, your margins and difficult former clients
Who else reads it	Competitors, who will borrow your vocabulary	Your clients and your team
When it starts paying back	In pitches, as soon as a few chapters exist	Slowly; it depends on building a side line

The “who else reads it” row is the one owners miss. A chapter called “Why we never discount” is fine. A chapter on how you pad estimates, read by your largest client’s procurement lead, is not.

The owner book also has a crowded shelf. Blair Enns’s The Win Without Pitching Manifesto (2010) is aimed, in its own description on Goodreads, at “owners of independent creative businesses (design firms & advertising agencies)”. David C. Baker’s The Business of Expertise is written for “entrepreneurial experts selling advice”. Their authors advise firms for a living, and the core ideas (specialise, stop free pitching, price on value) are well covered.

Four questions that settle the choice

1. Where is next year’s revenue gap? If it is new business, write the client book. It works in pitches before it is finished.
2. Do you want to step back from delivery within three years? If yes, and someone can already run the agency, the owner book can build your next role.
3. Can you name the client in one sentence? A generalist agency’s client book turns into a capabilities brochure. If you cannot name the reader, fix the positioning first.
4. Do you have something new to say about running an agency? Your own numbers, or a position other owners would argue with. If not, the owner book will repeat the shelf.

Our view: for a 10 to 50 person agency that still depends on new business, the client book comes first, and the owner book is the second book or a talk. Owners who disagree usually have a successor in place, and may be right.

For the shape of a client-facing book, see the main-site guide on how agency founders can write an authority book. To test whether your point of view can carry a book, see how to write a thought leadership book.

What your shared drive already holds, and what each file is good for

Material	What it gives the book	Watch out for
Published case studies	Results the client already approved	Written to sell; approval for a web page may not cover a book
Pitch decks	Your “how we think” slides	The prospect’s brief was shared in confidence
Proposals, won and lost	Your diagnostic questions and scoping logic	Lost ones show what buyers would not pay for
Process docs and playbooks	The method, step by step	Too operational for a client book; check who wrote them
Retros and post-mortems	The most honest record of what goes wrong	Names staff and clients, sometimes unfairly
Client reports and dashboards	Patterns across accounts	The numbers belong to the client; use ranges
New-business call notes	Prospects’ exact words for their problem	The people stay anonymous

Our ranking is unfashionable: retros and lost proposals are the most valuable files and the least used. Published case studies are the least valuable as they stand, because they were written to flatter. For turning one into an honest chapter, and the permission email to send, see client stories and case studies in a book.

Client NDAs: the work may be yours to show, the results usually are not

Agency agreements usually include confidentiality terms, and many clients add an NDA at the first meeting. The AIGA Standard Form of Agreement for Design Services (2021), a published set of terms design firms can attach to their proposals, is a useful reference. Its confidentiality clause has each party hold the other’s “technical and business information” in “strict confidence”. Its promotion clause lets the designer show finished work in portfolios and design periodicals “to the extent they do not contain Client’s Confidential Information”, and lets either party describe its role “subject to the other’s reasonable approval”.

Two consequences follow. First, the work and the numbers are different things. Showing a campaign you made is portfolio use. Publishing that it cut the client’s cost per lead by 40% publishes the client’s business information. Second, a book is not obviously a portfolio. We would treat any recognisable account as needing written approval of the specific passage, whatever your template says. Large clients often make you sign their paper, and some forbid naming them at all. This is not legal advice; have a lawyer read your template and your five biggest accounts’ contracts.

Plenty survives: patterns across accounts, labelled composites, ranges instead of exact figures, and a few named stories with written approval. Before any file goes into an AI tool, remove client names and check whether your contracts restrict sharing client material with third-party software.

Your team wrote half of this: ownership and credit

This is not legal advice, but the defaults are worth knowing.

In the US, a work “prepared by an employee within the scope of his or her employment” is a work made for hire (17 U.S.C. § 101), and for such works “the employer or other person for whom the work was prepared is considered the author” (§ 201(b)). In the UK, the Intellectual Property Office’s guidance says the employer is first owner of copyright in work an employee makes in the course of employment, “subject to any agreement to the contrary”, while someone working under a contract for services “will usually retain copyright”.

Three consequences:

• The employer is the agency, not you. If you have partners or investors and publish under your own name, the book draws on company property. Agree in writing who owns the book, who keeps the income and what happens if the agency is sold.
• Freelancers are different. Under US law, commissioned work counts as made for hire only in nine listed categories, and only with a written agreement signed by both parties. In the UK the freelancer usually keeps copyright. Get a written assignment, or rewrite the ideas from scratch.
• Ownership does not settle credit. Our rule: if someone would recognise their own document in a chapter, they are named in that chapter, not only in the acknowledgements. Ask first. A partner who drafts chapters is a co-author, not a thank-you.

A hypothetical agency choosing between the two

Imagine a 24-person agency that builds websites and runs demand generation for mid-sized industrial manufacturers. The founder has run it for 13 years. Eight retainers make up most of the revenue, and two clients left last year after being acquired. New business is the gap.

She has about 150 proposals, 40 retros and a playbook written by her head of delivery. Conference invitations make the owner book tempting.

The four questions point to the client book. Her retros keep recording one failure: sites built for distributors when the person who specifies the part is an engineer. Her lost proposals show buyers resisting paying for research with those engineers. That is a point of view. The book argues it for marketing heads at manufacturers that sell through distributors, with her diagnostic as an appendix. The playbook informs one chapter, credited to her head of delivery. Client results appear as ranges, plus two named stories approved in writing. The owner book becomes a conference talk.

Putting the book to work in pitches and RFPs

LinkedIn’s write-up of 2025 Edelman–LinkedIn research describes “hidden buyers”, stakeholders in finance, operations, legal, compliance and procurement, and reports that 56% of target buyers and 55% of hidden buyers use thought leadership as part of vendor evaluation. LinkedIn sells B2B advertising, so treat it as direction.

• In pitches, let the book replace free thinking. Instead of spec creative, bring the chapter that shows how you diagnose this problem and work through it with the prospect.
• In RFPs, cite the method by name. Use the book’s framework in the approach section and attach a chapter only where the rules allow supplementary material.
• Write a section for procurement. Eight to ten pages on how you scope, price, report, staff accounts and protect client data. We think it will be read more carefully than any chapter, by people who never meet you.

Then use the book to filter. A short section on who your approach is wrong for (budget floor, sector, the client who wants an order-taker) saves proposals for prospects who were never going to fit. For turning readers into clients more widely, see how to use a book to attract clients; we won’t repeat it here.

Owner hours: delegate the digging, keep the argument

You still sell, so the book competes with new business for your hours. Stop doing the parts your team can do.

Delegate: pulling proposals and copying out each client’s problem in their words; tagging retros by failure; turning dashboard data into ranges and checking numbers; interviewing delivery leads; tracking client approvals.

Keep: the point of view, the argument of each chapter, the final voice, and every decision to name a client.

Do not hand the whole draft to the marketing team; it will come back sounding like the agency’s blog, because that is what they write every week. Henry DeVries of Agency Owner News suggests ten 15-minute recorded interviews can produce a rough draft. We think that optimistic for a book built on evidence, but talking a chapter through and editing the transcript suits owners who think out loud. Our rule: two fixed 90-minute blocks a week for you, and a named team member running research. For more, see how to write a book when you have no time.

Guided software can take on part of the sorting, and WritebookAI is one option. You upload proposals, decks and retros as PDF, Word or text files, with client names removed, and its source analysis shows what the material covers and what is missing. A verification interview asks about gaps and conflicts before it builds a strategy and chapter plan you approve, and a Writing DNA profile from your own writing samples guides the drafts. Chapters are drafted from your material, and when a client result is missing, the chapter leaves it out and asks you instead of inventing it. It does not read your contracts, get client approval or decide who owns a staff document. The free start is described on the WritebookAI homepage.

Before chapter one: a Friday afternoon with three folders

Open three folders: proposals, retros and contracts. That is enough to decide and clear the risks.

If the proposals show the same client problem a dozen times, you have the centre of a client book. If nothing repeats there but your notes on running the agency do, you may have the other book. Either way, you will know by the end of the afternoon.