Two Languages, One Style Sheet: Keeping British English Credible for US Clients

British English and American English are close enough to lull you into a false sense of security. A US client reads your draft, understands every word, and still asks for a rewrite because the spelling looks inconsistent, the dates are unfamiliar, or the legal team has spotted a term that means something different in their market. For UK freelancers, the trapdoor is rarely a catastrophic misunderstanding. It is a hundred tiny conventions pulling in different directions.

The answer is not to pick a side once and hope for the best. It is to agree a house style before the first draft, put it in writing, and use it as the reference point when feedback starts arriving from three different people. At Get Writer Help, we see this most often with UK writers producing copy for American brands while keeping their own business based in Britain. The work is perfectly doable. It just needs a deliberate approach.

Why the trapdoor opens

Clients often say 'use US English' and mean something narrower than they realise. They might want American spelling but British legal terms. They might want a British voice for a US product. They might want UK punctuation because the editor is based in London, but US date formats because the audience is in New York. None of those choices is wrong. The problem is leaving them unmade.

Once the draft is circulating, everyone becomes a style expert. Marketing prefers 'organize'. Legal wants 'licence' because the client is a UK entity. The US editor adds serial commas. The founder hates serial commas. You end up mediating a small language war instead of writing.

Start with a one-page style agreement

Before you write, send a short document. One page is enough. Call it 'House style decisions for [project], version 1' and ask the client to confirm it by email. It does not need to be a legal document, but it should sit alongside the brief and the contract.

Include the language variant, the dictionary you will follow, spelling exceptions, punctuation preferences, number and date formats, currency conventions, regulated or legal-sensitive terms, and who has final approval. Add a line about how style changes will be handled once drafting starts. If the client cannot answer everything, propose sensible defaults and mark them as assumptions.

Spelling: pick a dictionary, not a vibe

British English generally prefers '-ise' endings, while US English uses '-ize'. Oxford style allows '-ize' in British English, so decide which convention applies. Do not mix 'organise' and 'organize' in the same document unless a brand name or quoted material demands it.

Watch the familiar clusters: colour/color, favour/favor, centre/center, theatre/theater, defence/defense, licence/license, practice/practise, travelled/traveled, cancelled/canceled, grey/gray, programme/program. Some are not simple swaps. In UK English, 'licence' is usually the noun and 'license' the verb; in US English, 'license' covers both. UK 'practice' is the noun and 'practise' the verb; US English uses 'practice' for both. Software is often 'program' even in UK tech copy, while a TV or event schedule is a 'programme'.

Brand names, product names, and quoted material stay as they are. If the client's brand uses American spelling in its name, do not correct it. If the client insists on British spelling but wants 'program' for software, write that down. The style sheet is there to stop the same debate happening twice.

Punctuation and quotation marks

US copy often uses the serial comma; UK copy often does not. Neither is a moral position. Choose one and apply it consistently. Quotation marks are another common tripwire. UK style usually uses single quotes as the primary mark and double quotes within, while US style reverses that. Punctuation inside or outside quotation marks also differs: US style tends to place commas and full stops inside closing quotation marks, while UK style often keeps them outside unless they are part of the quoted text.

Dashes are worth a line in the style sheet too. UK publishing often uses a spaced en dash, while US copy frequently uses an unspaced em dash. Again, consistency matters more than doctrine. If the client has an existing editor, ask for two sample pages of approved copy and follow the pattern you see.

Dates, times, numbers, and currency

Write dates in a way that cannot be misread. UK readers expect 8 November 2026; US readers expect November 8, 2026. Numeric dates such as 03/04/2026 are a genuine hazard. Use the month name in body copy unless space is tight. If you must use numerals, state the format in the style sheet.

Times need a convention too: 24-hour or 12-hour, plus the time zone. Currency should be explicit. Use '£' for pounds and 'US$' or 'USD' for dollars when there is any chance of confusion. Do not invent conversion rates. If the client wants dual pricing, ask for the rate and the date it was set, and make clear whether taxes are included.

Measurement is another quiet difference. UK copy may use miles, pints, and Celsius alongside metric measures. US copy may use feet, gallons, and Fahrenheit. Do not convert unless the brief asks for it. If you do convert, check the rounding and say whether the figure is approximate.

Legal-sensitive terms need a steady hand

This is where small language differences can become expensive. UK terms such as 'limited company', 'Ltd', 'VAT', 'UK GDPR', 'ICO', 'solicitor', 'barrister', and 'trade mark' should not be casually translated into US equivalents. A US audience may understand 'attorney' more readily than 'solicitor', but if the copy refers to a UK legal role, changing the word can change the meaning.

Regulated industries need extra care. Financial promotions, health claims, advertising disclosures, and data protection language are not areas for improvised synonyms. Ask whether the client's legal or compliance team will review the copy. If they will, build that review into the schedule. If they will not, flag the terms you are unsure about rather than guessing.

Your contract should also be clear about governing law, jurisdiction, and the language of the deliverable. A UK freelancer working for a US client can absolutely write in US English, but the agreement should say so. 'English' is not a style guide.

Names, titles, and cultural references

Small cultural references can date a draft or confuse a reader. A UK 'CV' is a US 'résumé'. A 'mobile' is a 'cell phone'. A 'holiday' is a 'vacation'. 'Autumn' becomes 'fall' in US copy, though 'autumn' is still understood. 'Fortnight' may need rewriting for a US audience. Honorifics differ too: UK 'Mr' usually has no full stop; US 'Mr.' does.

None of this means sanding down your voice. It means deciding which references travel and which need a gloss. A British writer working for a US brand does not need to sound American. They need to sound deliberate.

The pre-draft checklist

Before you start, confirm: the language variant; the dictionary or style guide; spelling exceptions; punctuation and quotation conventions; date, time, number, and currency formats; legal or regulated terms; names and titles; who approves copy; how many revision rounds are included; and how style changes after sign-off will be charged. Send the list to the client, ask for a yes or a correction, and keep the reply.

If a client says 'just make it American', reply warmly: 'Happy to. To avoid mixed conventions, I will use US spelling and punctuation, keep UK legal terms where they refer to UK entities, and flag anything that needs your legal team. I will send a one-page style sheet for sign-off before drafting.' That single email can save a week of revisions.

A style sheet is not bureaucracy. It is a small piece of professional insurance. It protects your time, gives the client a clear decision trail, and makes the copy feel consistent from the first headline to the final disclaimer.