Brand voice defines the communication character and principles that help a particular organisation serve its audience. House style defines repeatable editorial conventions such as capitalisation, numbers, dates, punctuation and preferred terminology. Keep the purposes separate, connect both guides through realistic examples and make one rule the clear authority whenever they overlap.
What belongs in a brand voice guide
Voice guidance should help a writer decide how the organisation communicates, not merely how text is formatted. Include:
- three to five behaviour-based principles;
- the audience benefit behind each principle;
- “do” and “avoid” examples;
- tone shifts for important situations;
- message boundaries and claims discipline;
- representative examples across channels.
“Be human” is too vague. “Name the decision before the supporting detail, so the reader can act” is usable. See how to write brand voice guidelines for a fuller working method.
What belongs in a house style guide
House style resolves recurring editorial choices so writers do not debate them every time. It may cover:
- spelling and UK English conventions;
- headings, capitalisation and punctuation;
- dates, times, currencies, units and numbers;
- abbreviations and technical terms;
- link, alt-text and accessibility conventions;
- product names and controlled vocabulary;
- inclusive-language rules and legal requirements.
The guide should point to an established reference where possible and document only additions or exceptions. A focused brand vocabulary guide can hold customer-facing terms that require definitions, approved alternatives or evidence.
Where voice and style overlap
Some choices serve both character and consistency. Contractions may make language feel direct, but error messages need clarity. Sentence length affects voice and readability. Preferred terminology can express a position while preventing factual confusion.
Assign each rule a primary home and link rather than duplicating it. For example, house style may define how to write “email”; voice guidance can show how a plain, direct email opening applies a communication principle. When copies conflict, name the authority and resolve the duplicate.
Illustrative example: one message, two guides
Illustrative example: a software company must write a failed-payment message.
The voice guide says to acknowledge the problem without blame, state the next action early and avoid forced humour in stressful moments. The house style says to use sentence case, write dates as “25 October 2026”, call the page “billing settings” and use descriptive link text.
Together they produce a message that feels appropriate and remains consistent. This hypothetical example shows different jobs: voice shapes the communication decision; style resolves the editorial details.
Decide which guide owns each question
Use this routing test:
- Does the question concern the relationship and impression created for the audience? Put it in voice.
- Does it concern a repeatable language or formatting convention? Put it in house style.
- Does it concern what the organisation should claim? Link to approved messaging and evidence.
- Does it concern legal, safety or technical accuracy? The relevant subject-matter standard takes priority.
Keep a decision log for new questions. If the same issue recurs, update the appropriate source rather than leaving the answer in a chat thread.
Give the guides different structures
Voice guidance benefits from explanation, contrast and examples. House style needs alphabetical or searchable entries, concise rules and cross-references. Combining everything into one long PDF can make both hard to use.
Publish the guides in a searchable, versioned location. Give each page an owner and review date. The brand voice governance model can establish which work teams publish independently and which content needs specialist review.
Test the system with real work
Give several writers the same brief and ask them to explain their decisions. If voice outputs are identical, the rules may be scripts. If they have no recognisable relationship, the principles may be too vague. If writers repeatedly search outside the house style, its navigation or coverage needs work.
Audit high-frequency and high-risk journeys rather than isolated favourite sentences. Update a rule when evidence or operations change, and record the reason.
Limitations and trade-offs
More rules can improve consistency while slowing writing and excluding valid variation. International teams may need local language guidance instead of literal translations. Accessibility, user need and factual accuracy should override a stylistic preference.
Neither guide replaces messaging strategy. Voice determines how you communicate; it does not decide which customer, value or proof the business should prioritise.
Frequently asked questions
Can one document contain both guides?
Yes, if sections have clear purposes, ownership and navigation. Separation matters conceptually more than the number of files.
Which guide should cover tone?
Put tone-by-context in the voice guide. House style may link to it where a convention changes for a specific channel.
Who owns house style?
Usually a content design, editorial or communications owner maintains it with input from accessibility, legal, localisation and product specialists.
Your useful next step
Export twenty current rules into a table. Label each “voice”, “house style”, “messaging evidence” or “specialist requirement”. Move duplicates to one primary home, add cross-links and test the revised structure by editing one real customer journey.