Hiring a copywriting agency: the four kinds, how the fees are built, and the brief that gets good work

A copywriting agency writes the words that do a commercial job: web pages, ads, emails, sales decks, product descriptions, long form articles. The reason buyers get mismatched work is that four distinct kinds of firm trade under the same label, and each is built around a different unit of output. Choose by the job in front of you, not by the portfolio that looks nicest.

The short version: conversion shops write pages and ads that have to produce an action, content studios write volume on a calendar, brand and messaging practices write the language everything else inherits, and technical or specialist writers cover regulated and complex subjects. A firm that is genuinely excellent at one of these is usually average at the next.

The four kinds, and which one your job needs

Kind	Typical output	How they charge	Hire when
Conversion and direct response	Landing pages, ad sets, sales emails, sales pages	Per project, sometimes with a test and iterate retainer	Traffic arrives and does not convert
Content studio	Articles, guides, case studies, newsletters, at volume	Per piece or a monthly package of a set number of pieces	You need consistent published output and an editorial process
Brand and messaging	Positioning language, messaging framework, tone of voice, naming, taglines	Fixed fee project in phases	Every team describes the product differently
Technical or regulated	Documentation, finance, health, legal, engineering content	Day rate or per piece at a higher rate	The subject requires a writer who understands it and the review it must pass

How the money is built

Four pricing structures are in common use, and each one shapes behaviour.

• Per piece. Clean for predictable formats. Check what a piece includes: interview time, research, two rounds of edits, a headline set, meta description, and whether the writer uploads it.
• Per project. Standard for a page set, a launch or a messaging engagement. Insist on a named deliverable list and a revision count.
• Monthly retainer. Buys a share of capacity and continuity of voice. Ask what happens to unused capacity and whether a strategist is included or billed separately.
• Day rate. Right for workshops, embedded work and specialist subjects where scoping in advance is artificial.

Rates move with market, seniority and subject, so do not shop on headline price alone. Compare on cost per finished, approved, published piece, including your own review time. A cheaper writer who needs three rounds of rewriting is the expensive option, and an agency that files on brief first time is worth a premium you can calculate.

What belongs in the brief

Most disappointing copy traces back to a thin brief. Write these nine lines before you approach anybody, and you will also find that quotes come back closer together.

• The reader. One named role, their trigger for looking, and the one thing they are afraid of getting wrong.
• The single action. What the reader should do, and what counts as success.
• The claim. The one thing you want believed, in plain words.
• Proof. Numbers you can source, named customers who have agreed, credentials, a substantial warranty, integrations, independent reviews.
• Constraints. Regulatory wording, claims you cannot make, words legal will strike out, terms your category insists on.
• Voice. Three samples you admire and one sentence on why, plus two you dislike. This is faster and more accurate than a list of adjectives.
• Format and length. Where it will live and what it sits beside.
• Interview access. Who the writer may speak to, for how long. This is the highest value thing you can give them.
• Approval route. Named approvers, in order, with dates.

How to judge a firm before you commit

• Ask what was deleted. A writer who can explain what they cut from a page, and why, is editing rather than filling space.
• Ask for the brief behind a sample. Strong work is a response to a problem. If they cannot describe the problem, they may not have solved it.
• Buy one paid piece first. A single piece of real work, briefed properly and paid for properly, tells you more than a pitch. Watch how they handle the interview, the first draft and the first round of changes.
• Check the research habit. Do they ask to speak to a customer, read your support tickets, or sit in on a sales call? That instinct is what separates copy that converts from copy that reads well.
• Read their own site as a sample. It is the one piece of work where they were the client.
• Settle rights in the contract. Who owns the copy on payment, whether they may credit the work publicly, and what happens to unused drafts.
• Watch for anyone promising a conversion figure before the research. A firm that commits to a number it cannot have measured yet is selling certainty rather than writing. Walk away from that one.

Agency, freelance or in house

A freelancer is the right answer more often than agencies admit: one voice, direct access, lower overhead, excellent for a steady stream of one format. An agency earns its fee when you need several formats at once, cover when somebody is away, an editor above the writer, and a strategist who can say no to a bad brief. In house makes sense once volume is steady and the subject takes months to learn, and it still benefits from an outside writer for launches. Many teams run a hybrid: in house owns the voice and the calendar, outside writers cover peaks and specialisms.

If part of your plan is to produce more with generative tools, decide where the line sits before you brief anybody. What those tools do well and where a person still writes is covered in the guide to AI copywriter tools, and the workflow for combining the two is in AI copywriting simplified.

What buyers ask before they appoint a copywriting agency

How much does a copywriting agency cost?

Quotes vary by format, seniority and subject, and the honest comparison is cost per approved piece rather than a headline rate. Ask three firms to quote the same written brief; the spread will tell you more about what each one includes than any rate card.

Should I pay for a sample piece?

Pay for it. Free test pieces attract firms with spare capacity and get you work nobody researched. A paid pilot on a real brief is the most reliable selection method there is.

Who should be interviewed before writing starts?

Two customers who recently bought, one who chose a competitor, and whoever handles support. Half an hour each gives a writer the words real buyers use, which is the raw material of every strong page.

How many rounds of revisions are reasonable?

Two is standard: one substantive, one for detail. More than that usually means the brief was unresolved or a new approver appeared, and the fix is upstream.

Do I need a tone of voice guide first?

Not to start. Three samples you admire and two you do not will get a competent writer close on the first draft. A proper voice guide becomes worth the money once several people are writing.

What is the most common reason an engagement fails?

No single decision maker. When four people each ask for a different change, the copy converges on something nobody objects to and nobody responds to. Name one approver before the first draft.

The reader your finished copy has to survive

Copy used to be read by the person it was written for. A growing share of it is now read by a machine first and paraphrased to that person second, because the buyer asked an assistant what the options are and got a summary with a few names in it. Summarising is brutal to certain kinds of writing. Clever headlines, metaphors and build ups do not survive it, while a specific claim with a source attached travels through intact. That is a practical instruction for a brief, not a change of craft: put the plain answer in the first paragraph, keep the numbers next to the claim they support, and name the thing the product actually is somewhere a reader would find it. AI Knows Us shows which of a company's pages assistants quote back and which ones never get picked up, which is a useful thing to know before you commission the next twenty.