Letterhead Design in 2026: What UK Law Requires, What It Costs, Why It Still Matters

Quick answer

A letterhead still earns its keep in 2026 because the documents that close deals (quotes, invoices, contracts, formal letters) are exactly the documents where looking established matters most. For UK limited companies it’s also a legal-compliance surface: the Companies Act requires your registered name, number, registered office and country of registration on business letters, printed or digital. Professional design runs £50 to £250 as part of an identity package; the return is every serious document you send for the next decade.

What UK law requires on a letterhead

For a limited company, business letters (including emailed PDFs) must show:

• The full registered company name (not just the trading name)
• Company registration number and country of registration (e.g. “Registered in England and Wales”)
• Registered office address
• If you choose to show directors’ names, you must show all of them, not a selection

VAT-registered businesses add the VAT number on invoices. Sole traders have lighter obligations (your own name and business address for correspondence), but the credibility logic is identical. These details conventionally live in small print in the footer, compliant without shouting.

Why it still matters when everything is email

The letterhead didn’t die; it became a PDF. Quotes, proposals, invoices and contracts are all sent as documents, and a quote on a designed template with a proper header, consistent typography and a compliant footer reads as “established business” before a word is read. The comparison isn’t letterhead vs no letterhead. It’s your quote next to a competitor’s Word default with a stretched logo. On five-figure decisions, that first impression is doing real work.

Anatomy of a letterhead that works

• Header: logo at a restrained size (25 to 35mm wide typically), contact details set in the brand typeface. Resist the urge to fill the top third: white space is the luxury signal.
• Body area: generous margins (20 to 25mm), a defined type area that word-processor templates respect, so letters typed by anyone in the business still look designed.
• Footer: the legal small print, set properly: 7 to 8pt, letter-spaced, in brand colour at reduced strength.
• Continuation sheets: a stripped second-page version (logo only) for multi-page documents.

Digital, print, or both?

Most UK small businesses in 2026 need the first two and print a batch only if their sector still posts documents. Printing runs £40 to £90 per 500 sheets on decent uncoated stock.

What letterhead design costs

As a standalone job: £50 to £150 from a freelancer, £100 to £250 from a studio including the editable templates. The better-value route is bundling it into a brand identity package alongside business cards (see what business cards cost in the UK). The stationery suite shares one design system, so the marginal cost of the letterhead inside a package is small. Full details on our letterhead design service page.

The mistakes we see weekly

• The stretched logo. A low-res logo dragged wider in Word is the single most common credibility leak on UK small-business quotes.
• Missing legal details. Trading name only, no company number: technically a Companies Act breach, practically a flag to procurement departments.
• Unusable templates. A beautiful letterhead delivered only as a flat JPEG nobody can type into. Insist on editable Word/Docs templates as a deliverable.
• Inconsistency with the rest of the brand. If the invoice, the van and the website disagree, each one quietly discredits the others.

A worked cost breakdown for a full document set

“Letterhead design” is rarely one deliverable. What a small UK business actually needs, and what each piece tends to add in 2026:

Buy those individually from different suppliers and you can easily spend £400 on a set that still doesn’t quite match. Commissioned together as one system (the approach behind a proper business stationery suite), the same list usually lands between £150 and £300, because the type scale, margins and footer treatment are designed once and reused. It is the same economy that makes a whole identity cheaper than assembling the pieces one invoice at a time, and the reason fixed-fee studios price stationery as a set: the second document costs a fraction of the first.

The email signature is the letterhead nobody designs

A ten-person firm sending 40 emails each per working day pushes out roughly 100,000 branded impressions a year through email signatures alone. That dwarfs any print run, yet it is almost always the piece left to individuals, which is how you end up with four different logo crops, three phone number formats and one person’s inspirational quote in purple Comic Sans.

Rules that keep signatures both compliant and clean: host the logo image on your own domain at fixed pixel dimensions (roughly 120 to 180px wide, served at 2x for retina), never paste it inline as an attachment; keep total signature weight under about 50KB so it doesn’t trip spam filters; use live text for contact details rather than an image, because images are frequently blocked by default; and put the Companies Act details in a smaller grey block below the sign-off. If your emails constitute business letters (and quotes and invoices sent by email do), the registered details belong there too, not only on the attached PDF.

Edge cases that catch people out

• Trading names. If you trade as “Bright Spark Electrical” but the company is “B S E Contracting Ltd”, the registered name must still appear somewhere on the document. The usual fix is a footer line reading “Bright Spark Electrical is a trading name of B S E Contracting Ltd, registered in England and Wales no. 12345678.”
• LLPs and partnerships. An LLP must show its registered name, number and registered office. An ordinary partnership of fewer than 20 partners must either list all partners’ names or state an address where the list can be inspected; picking one and sticking to it avoids awkward reprints when someone joins.
• Charities. Registered charities in England and Wales must state their charity status on letters, invoices and receipts; charitable companies get both sets of obligations at once.
• VAT. The number belongs on VAT invoices specifically. Adding it to the letterhead footer is harmless and saves editing two templates, but only once you’re actually registered, because displaying a number you don’t hold is a genuine problem.
• Moving office. A registered office change means every template, PDF and signature is now technically non-compliant. It belongs on the same sweep as the rest of a rebrand or business-change checklist, where stationery is the most commonly missed item.

What to ask before you commission or print

1. “Which editable formats do I get?” Insist on .docx and a Google Docs copy, not just PDF and never just JPEG. Ask them to demonstrate typing a paragraph into it.
2. “Will this upload into Xero / QuickBooks / FreeAgent?” Each has its own template mechanism and margin constraints. A designer who has done it before will ask which software you use before starting.
3. “What happens to my logo at 25mm wide?” Small reproduction is where over-detailed marks fall apart. If the mark needs a simplified small-use variant, better to find out now than on the first print run.
4. “Is the footer text legible when printed?” Anything below 7pt, reversed out of a mid-tone, or set in a light weight will vanish on an office laser printer. Ask for a physical proof.

On the print side, treat the paper as part of the message. Uncoated 100 to 120gsm is the professional default and takes toner and pen cleanly; anything glossy reads as a flyer and refuses ballpoint. If you want the letterhead to feel expensive, spend on stock weight (140gsm+) rather than effects. If you are tempted by foil or embossing, the economics of that decision are set out in our guide to print finishes and when premium print pays. Whoever supplies the files should be handing over print-ready artwork with bleed, crop marks and CMYK colour already set, because a printer sending files back for correction costs you a week. Order 250 sheets rather than 1,000 the first time. Details change, and a drawer of obsolete letterhead is a small, annoying monument to optimism.

Sources & Further Reading

• Company Stationery Requirements, GOV.UK
• Companies Act 2006, legislation.gov.uk
• VAT Invoice Requirements, GOV.UK