Ask five people in a business what it does, and you get five answers. That is normal, and it is the reason messaging documents exist.
It is also why most of them fail. The document gets written, circulated, admired briefly, and then everybody carries on describing the business however they were describing it before, because nothing in the document was more usable than what they already had.
Knowing how to create a brand messaging guide is mostly knowing how to write one people will actually reach for.
Start with who, and be uncomfortably specific
Not “small businesses”. Not “ambitious organisations”. A description narrow enough that some people are excluded by it.
The discomfort is the point. A message written for everybody is written for nobody, and the instinct to widen it is what produces the generic language that makes most business writing interchangeable.
For each audience you name, write down what they are trying to achieve, what they have already tried, what worries them, and what they would need to believe before choosing you. Those four answers are the raw material for everything that follows.
If you cannot answer them, you have a research problem rather than a writing problem. Five conversations with actual customers will supply more than a day of internal discussion.
Say what you do before saying why it matters
The common failure is opening with significance. “We believe technology should serve people” tells a reader nothing about what happens if they contact you.
Lead with the plain description. What you do, for whom, in words they would use. Then, if it earns its place, why it is done that way.
The test: could somebody read your first sentence and correctly describe your business to a colleague? Most positioning statements fail that and their authors are usually surprised.
Make the value proposition checkable
A value proposition is a claim, and claims that cannot be examined get discounted.
“We deliver exceptional results” is unverifiable and therefore ignored. “We build sites that load in under two seconds on a mid-range phone, and we publish the measurements” is checkable, which is what makes it persuasive.
Where you cannot be specific, be smaller rather than vaguer. An understated claim that holds up outperforms a strong one that visibly does not.
And say what you do not do. A business clearly stating which situations it does not handle reads as confident, saves everybody a conversation, and makes the remaining claims more credible.
Tone, written as decisions rather than adjectives
Most tone sections list adjectives. Friendly, professional, approachable. Nobody has ever written differently as a result.
What changes behaviour is decisions somebody can apply: which words you use and which you avoid, whether you use contractions, how you write numbers and dates, what your error messages sound like, whether you ever use exclamation marks.
Include examples of the same sentence written correctly and incorrectly. One pair does more than a page of description.
And cover the small moments, since that is where tone actually shows on a website: button labels, form hints, empty states, confirmation messages.
How to create a brand messaging guide people reach for
This is the difference between a document that gets used and one that gets filed.
Write the one-line description, the paragraph version and the page version. Write the standard answers to the five questions you are asked most. Write the boilerplate that goes at the bottom of a proposal.
People reach for a document that saves them writing something. They do not reach for one that explains how they should have written it.
Keep it honest and keep it current
Claims in messaging are still claims. Anything implying an outcome you cannot evidence is a problem regardless of how it is phrased, and environmental claims specifically must be accurate and substantiated.
Review annually. Services change, audiences shift, and a messaging guide describing a business you no longer are is worse than none, because people follow it.
Assign an owner, since documents without one drift and then quietly stop being used.
Where this reaches the website, make sure the pages match the guide and that they work for everybody. Working towards WCAG 2.1 Level AA matters here, because clear messaging on a page somebody cannot use has not communicated anything.
Where performance and environmental impact both apply, treat them as the same lever: reducing unnecessary data transfer and processing supports a faster experience while lowering estimated digital carbon, though environmental figures remain modelled rather than directly measured.
Our sustainable web design work starts from what a business actually does, which is where usable messaging comes from.