Seven inputs to a copywriting services market size estimate

What to take away

Most teams count copywriters first, which is the mistake. No official headcount exists, so size the client base instead. A copywriting services market size estimate for England needs seven inputs, not a headcount.

Input onethe ONS UK business activity, size and location bulletin for 2023, which counts UK businesses by industry, size and location.
Input twosector filters from those counts, such as professional, scientific and technical activities, plus information and communication.
Input threean employee size band, for example ten to forty-nine staff.
Input fouran annual external copywriting spend per business, labelled illustrative at about £1,200.
Input fivethe share of businesses judged unlikely to buy externally, stated as an assumption.
Input sixthe ICO's guidance on what counts as personal information, which sets the UK GDPR boundary for personalised copy.
Input seventraining demand, tracked through copywriting training courses from CIM, checked against freelance day rates and agency turnover.

Buyers include almost any business that publishes words: websites, tenders, product pages, reports, email. An estimate built on named sources and stated assumptions beats a headline number pulled from nowhere.

Why the obvious number does not exist

Search for a copywriting services market size in England and you will find consultancy reports with paywalled methods. No ONS series covers copywriting, and standard industrial classification codes do not isolate it. Most of the work sits inside advertising, marketing or other professional services.

Two honest options remain. Estimate the buyer side from official business counts and apply a spend assumption. Or estimate the supplier side from freelance registers and agency directories, which are incomplete and duplicate sole traders. The buyer-side method is stronger: the client base is measured, published and comparable year on year.

Sizing the client base: sector, size band, spend and non-buyer share

The ONS bulletin counts UK businesses by industry, size and location. Filter to professional, scientific and technical activities, plus information and communication, and you have much of the B2B copy buyer base. Add firms with websites in other sectors and it widens.

For example, a services firm with ten to forty-nine employees might spend £1,200 a year on external copywriting. That is an illustrative figure, not a measured one, and should be labelled as such.

Input five is the share you judge unlikely to buy externally. A common assumption is a percentage reduction, but you must show your reasoning. If you are testing whether a niche can support an agency, our guide to the copywriting services market in England sets out how demand varies by sector and region.

Input six: the ICO personal data boundary

Personalisation changes the addressable market. Once copy is tailored using names, job titles or browsing behaviour, the work touches personal data and UK GDPR applies. The ICO guidance explains what falls inside that definition.

Clients in regulated sectors often need a writer who understands consent and lawful basis. That narrows the supplier pool and supports higher day rates. It also creates steady review work on pages that collect data without a clear notice.

Input seven: training demand and rate checks

Training demand is a proxy for professionalisation. When more buyers expect trained writers, the market shifts from generalist freelancers to specialists. CIM's copywriting training courses are one public signal, aimed at marketers who write as part of a wider role.

Read this alongside pricing. If training volumes rise while rates stay flat, supply is growing faster than demand. If rates rise with training, buyers are paying for demonstrated skill. For a closer look at how writers package and price this work, see copywriting services business models in England.

A repeatable six-step method

Pull the ONS business counts and filter to the sectors you serve.
Choose a size band, such as ten to forty-nine employees, and state why.
Apply a labelled illustrative spend per business per year.
Subtract the share you judge unlikely to buy externally, and show the assumption.
Sanity-check the total against agency turnover data and freelance day rates.
Date the estimate and note which source would change it first.

Which source should anchor the estimate

Use the ONS business counts. They are published, dated and consistent, which makes your assumptions auditable. Everything else adjusts the result rather than defining it.

Six-step market size method

Pull ONS business counts, filter sectors
Choose a size band and state why
Apply labelled illustrative spend per business
Subtract unlikely external buyers, show assumption
Sanity-check against agency turnover and day rates
Date the estimate, note first source to change

How often should it be refreshed

Annually, when the business counts update. Rates and training demand can be checked more often, but changing those does not change the client base.

Common questions

Is there an official copywriting market size for England?

No. Neither ONS nor any regulator publishes one. Any figure you see is an estimate built from business counts, rate cards or directory data, so ask what assumptions sit behind it.

Does the ONS data cover England only?

The bulletin covers the whole United Kingdom. For England only, adjust for the devolved nations, and note that some rules differ in Scotland, Wales and Northern Ireland.

Why does data protection affect market size?

Personalised copy uses personal information, so some work needs a lawful basis and a privacy notice. That raises the skill bar and reduces how many suppliers can bid.

Is the market growing?

Business counts and training demand point to a stable or expanding client base, but nobody publishes a copywriting-specific growth rate. Treat any percentage without a named source as an assumption.