Most small business owners put off price rises for months, then send one rushed email that triggers the cancellations they were afraid of. A good price increase letter to customers in the UK is short and specific. It is honest about the reason and makes leaving easy, and that last part, oddly, is what makes people stay. This guide covers what to include, the UK rules worth knowing, and how to use Claude AI to draft and adapt the letter without it sounding like a template.
What should a price increase letter to customers include?
The structure that works for most small businesses is five short blocks:
- The change, up front. "From 1 December 2026, your monthly plan will go from £45 to £49."
- The reason, in one or two sentences. Specific beats general. "Our wholesale coffee supplier has raised prices twice this year" lands better than "rising costs".
- What stays the same or improves. Only include this if it is true.
- Their options. How to cancel, downgrade or switch to annual billing, and by when.
- A named contact. A real person's name and a direct email or phone number.
That is it. Most letters that go wrong are too long, not too short.
Is there a legal notice period for price increases in the UK?
The Competition and Markets Authority's unfair contract terms guidance (CMA37), revised in July 2026, sets out how the Consumer Rights Act 2015 treats price variation terms. The CMA says the underlying law has not changed since 2015. Its position is that a price rise term is more likely to be fair where the consumer gets clear advance notice of the increase, early enough to avoid it by leaving the contract if they choose.
The guidance also warns that loose wording, such as a right to change prices "on reasonable notice" with no detail on how much, how often or why, is hard for customers to understand. Read your own terms and conditions before writing anything. If your terms are vague, your letter needs to be especially clear.
Do customers have the right to cancel after a price rise?
The CMA's guidance goes further than many owners expect. Customers should be genuinely free to escape a price rise by ending the contract, and they should not be left worse off for having signed up, for example by losing a prepayment.
So your letter should say plainly how to cancel and confirm there is no penalty. This feels counterintuitive, but making exit easy reduces complaints and chargebacks, and customers who feel trapped are the ones who leave angry reviews. If you sell business to business, different rules apply, so check your contract.
Should you mention inflation as the reason?
The ONS reports that CPI rose by 3.1% in the 12 months to August 2026, up from 2.9% the previous month. If your rise is roughly in line with that, saying so is fair and easy to check. If you are raising prices by 10%, pointing at a 3.1% headline rate invites the obvious question. Explain the real driver instead: a higher wage bill, a supplier increase, a software cost, or simply that you have not raised prices in three years.
How do you use Claude AI to draft the letter?
A prompt that reliably produces a usable first draft looks like this:
Write a price increase email to existing customers of a dog grooming business in Leeds. Current price £42 per full groom, new price £46, effective 1 December 2026. Reason: our shampoo and dryer servicing costs went up and we have not changed prices since 2023. Customers can cancel standing appointments by replying to this email, no charge. Under 180 words. Plain UK English, warm but direct, no apology paragraph, no exclamation marks. Put the new price and date in the first two sentences. Sign off as Sarah.
Then ask Claude to critique its own draft: "Where would a long-standing customer feel this is vague or evasive?" That second pass catches most of the weasel phrasing. If you want to reuse your tone and terms across many letters, the Claude setup guide for UK businesses covers Projects, which let you store that context once.
How do you adapt the letter for different customers?
Segments that usually deserve their own version:
- Long-standing customers. Acknowledge their loyalty in one line. Consider giving them an extra month at the old price.
- Recent sign-ups. Keep it brief and factual. They have less goodwill banked, and also less history to feel betrayed about.
- Your top accounts. Call them first, then send the letter as confirmation. A surprise email to your biggest customer is a risk you do not need to take.
- Annual or prepaid customers. Make clear when the new price applies to them, usually at renewal.
Claude handles this well because the facts stay fixed in the prompt while the tone changes. Check every version for figure drift, since a rewrite can occasionally round a price or shift a date.
What happens when customers reply angry?
Decide in advance what you will offer, if anything. A common approach is a fixed rule, such as one extra month at the old price for anyone who asks, so you are not negotiating case by case. Claude can draft reply templates for the three or four objections you expect most. For a fuller approach to handling unhappy responses and triaging a busy inbox, see this guide to AI complaint handling for UK small businesses.
Is it safe to paste customer data into Claude?
This is the simplest way to stay on the right side of UK GDPR. Write the template in Claude, then use the mail merge in your email platform or CRM to insert names and prices. If you do want Claude to help with account-level analysis, such as spotting which customers are on legacy pricing, review your data handling first. This AI data protection checklist for UK businesses walks through what to check before you share anything.
When is the best time to send a price increase letter?
A few practical rules that make the send go smoothly:
- Send on a Tuesday or Wednesday morning, when you can answer replies the same day.
- Avoid the week a customer has just had a complaint resolved.
- Avoid sending immediately before a bank holiday, when you will not be around to reply.
- Send a short reminder about a week before the change takes effect.
- Update your website prices on the same day, so new and existing customers see consistent figures.
The goal is not to avoid every cancellation. Some customers will leave, and that is usually fine. The goal is that nobody leaves because they felt misled.
Price Increase Letters with Claude AI — FAQ
How much notice should I give customers before a price increase in the UK?
No single notice period applies to every UK business. Your own terms and conditions usually set it, and some sectors such as telecoms and energy have their own rules. For consumer contracts, the CMA's unfair contract terms guidance (CMA37, revised in July 2026) says a price variation term is more likely to be fair when the customer gets enough advance notice to act on it and leave if they want to. In practice, many service businesses give at least one full billing cycle, and 30 days is a common minimum for monthly plans. Read your own terms first and give more notice than they require. Extra notice costs you little and shows customers you are not trying to slip the change past them.
Should I mention inflation in my price increase letter?
Only if it is true and relevant to your costs. The ONS reported that CPI inflation was 3.1% in the 12 months to August 2026, up from 2.9% in July, so customers will already know prices are rising generally. Quoting that figure can help, but it should not be your whole justification. Customers respond better to specific reasons tied to your business, such as a supplier's wholesale increase, a rise in staff wages or new equipment. If your increase is far above inflation, say why honestly instead of pointing at the headline rate. Ask Claude to draft one version with the inflation reference and one without, and pick the one that sounds most like you.
Can Claude AI write a price increase letter for me?
Yes, Claude can produce a solid first draft in under a minute, and it is good at adjusting tone for different customer groups. It cannot know your contract terms, your costs or your relationship with each customer, so you need to give it those facts in the prompt. Treat the output as a draft. Check every figure, date and promise against your records, remove anything that sounds generic, and make sure it matches what your terms and conditions allow. Claude's free plan is enough to write a handful of letters. The paid Pro plan, listed on Claude's pricing page at $20 a month when billed monthly, is worth it if you want to store your brand voice and terms in a Project and reuse them.
Do customers have the right to cancel after a price increase?
For consumer contracts, the CMA's guidance on the Consumer Rights Act 2015 treats as potentially unfair a term that lets a trader increase the price without giving the consumer the right to cancel if the final price is too high compared with the price agreed. The guidance is clear that the right to leave should be genuine, not just a formal right that is hard to use in practice. That means your letter should tell customers clearly how to cancel and that they will not be penalised for doing so. Business-to-business contracts follow different rules, so check your own agreement or take legal advice if the sums are large.
What should I avoid putting in a price increase letter?
Avoid vague phrases like 'a small adjustment' that hide the real number, long apologies, and blaming customers or staff. Do not bury the new price below three paragraphs of company news. Never state a figure you cannot back up, such as a cost rise percentage you have not calculated. Avoid promising prices will not rise again unless you mean it. And do not send the same letter to a ten-year customer and someone who joined last month, because the tone that works for one can feel cold to the other. Claude is useful here because it can rewrite one core letter into several versions quickly.
