Do You Need A Company Seal In The UK?

If you run a small business, you’ve probably seen a company document that ends with a neat little circular stamp impression and wondered if you’re missing something important.

Company seals can look “official” (and sometimes feel reassuring when you’re signing a big contract), but the rules around them in the UK are often misunderstood.

In this guide, we’ll walk you through what company seals in the UK businesses need to know: whether you actually need a seal, when it’s still useful, and how to use one properly without creating signing problems.

What Are Company Seals In The UK (And What Do They Do)?

A company seal (also called a common seal) is a physical device used to mark documents with the company’s name (and often the company number). Traditionally, a company would “execute” certain documents by applying the seal, rather than by having directors sign.

In practice, a seal is usually:

• a handheld press that embosses the paper (a raised impression), or
• a stamp-style seal (less common for “official” execution, but you’ll see it in some businesses).

Historically, company seals were central to proving a document was genuinely made by the company. Today, that role is mostly handled by clear signature rules and record-keeping.

It’s still worth understanding seals properly, because the other side to a deal might:

• ask whether you have one (especially where a deed is involved),
• send execution blocks that include “signed under the common seal”, or
• operate internal processes that treat sealing as the “gold standard” for authority.

If you want a deeper background on what a seal is and how it’s used in business documents, Company Stamp Or Seal is a helpful starting point.

Do You Need A Company Seal In The UK?

For most small businesses, no - you don’t need a company seal to operate in the UK, and you usually don’t need one to sign contracts.

The modern position (under the Companies Act 2006) is that companies can execute documents (including deeds) through signatures, without using a common seal.

So why do people still talk about company seals?

• Legacy practice: some industries and overseas counterparties still expect it.
• Administrative comfort: some businesses like the “official” formality.
• Execution misunderstandings: people sometimes think a seal is legally required for a deed (it’s not, but execution rules do matter).

There are also a few practical nuances here:

• If your articles of association (your company’s internal rulebook) say you must use a seal for certain actions, you’ll need to follow your own constitution or amend it. This is one reason it’s worth keeping your Company Constitution up to date.
• If you decide to use a seal, you need to do it correctly - otherwise you can accidentally create uncertainty about whether the document was validly executed.

In other words: for most businesses, company seals in the UK aren’t required by default, but they can still be relevant depending on your contracts, internal governance, and who you’re doing business with.

When Should You Use A Company Seal?

Even though a seal is rarely mandatory, there are situations where using one can be useful (or requested). The key is knowing when it’s worth it and when it’s just adding friction.

1) When A Counterparty Requests It (Especially Internationally)

If you’re signing with an overseas business, bank, investor, or institution, they may have compliance processes built around sealing.

Common scenarios include:

• opening foreign bank accounts
• cross-border supply arrangements
• international property or leasing paperwork
• dealing with authorities that still use formalities that feel “old school”

If it’s truly a “must have” for them, using a seal can be the quickest way to keep the deal moving - but you still want to make sure your internal authority and execution are correct (more on that below).

2) When Executing Deeds (Where You Want Extra Formality)

Some documents need to be made as a deed (for example, certain property-related documents, some powers, and some high-value or long-term commitments). A deed isn’t automatically “more enforceable”, but it is a special category with extra formality.

A deed can be executed by:

• two authorised signatories (often two directors, or a director and a company secretary), or
• a director signing in the presence of a witness, or
• using the company seal (if the company has one and follows the required process).

Most companies use signature-based execution, but a seal may be used if that’s your internal policy or if it suits the transaction.

If you’re unsure whether what you’re signing is a contract or a deed (or how to execute it), it’s worth getting clarity before you sign. The practicalities in Deeds are especially important here.

3) When You’re Signing High-Value Or High-Risk Agreements

Sometimes the seal is less about strict legal necessity and more about internal risk management.

For example, if you’re signing:

• a long-term commercial lease
• a major supplier agreement
• a large facilities or outsourcing contract
• an agreement involving valuable intellectual property

…your board or directors might prefer a more formal process, which can include sealing or board approvals.

One practical approach is to pair execution with a written board decision (so it’s crystal clear who approved the signature and why). For many SMEs, a Directors Resolution is a tidy way to document that internal authority.

4) When Your Articles Or Internal Policy Require It

Some companies adopt an internal “signing policy” that says certain documents must be:

• signed by two directors, or
• approved by the board, or
• sealed.

This can help prevent a single person from binding the company to a major obligation without oversight.

If your rules require a seal, don’t ignore them - failing to follow internal authority processes can create disputes later (especially if shareholders or directors fall out).

In founder-run companies, it’s also worth aligning signing authority with your broader governance documents, like your Shareholders Agreement, so everyone knows who can sign what and when approvals are needed.

How Do You Use A Company Seal Properly?

If you decide to use a seal, the goal is simple: make sure it’s clear the company intended to be bound, and that the seal was applied by someone with authority, using the correct process.

Here’s a practical checklist that works well for most small businesses.

Step 1: Check Your Articles And Any Signing Policy

Before you seal anything, confirm:

• whether your company has adopted a seal (some companies buy one but never formally adopt rules around its use)
• who is authorised to hold and use it
• whether witnesses are required and who can act as a witness
• whether a directors’ approval is needed before sealing

If your internal documents are silent, you’ll want to set a sensible process (and stick to it consistently).

Step 2: Use The Correct Execution Block In The Document

Many templates include an execution block like:

• “Executed as a deed by [Company Name] acting by [Director] in the presence of a witness…”
• “Executed under the common seal of [Company Name]…”

This matters because the “execution block” is what tells everyone how the company is signing. If you apply a seal but the execution block shows signature-only execution (or vice versa), you can create confusion.

That confusion can become a real problem later if a dispute arises and the other side challenges whether the document was properly executed.

Step 3: Apply The Seal Clearly (And Keep It Consistent)

Basic, but important: the seal impression should be clear enough to read. If it’s smudged, incomplete, or placed over text, it can look sloppy and raise questions about whether it was properly applied.

Good practice is to:

• place the seal near the signature or execution block
• avoid stamping over key terms
• use the same placement and process each time for consistency

Step 4: Arrange Witnessing If Needed

Depending on how the document is being executed (and what your internal rules require), a witness may be needed.

If a witness is required, make sure the witness:

• is present at the time of execution (not afterwards)
• signs where the document asks them to sign
• prints their name, address, and occupation if the document requires it

Witness rules can be surprisingly strict in practice, and “who counts” can depend on the transaction and the document type. If you need clarity, Witness A Signature is a useful reference point.

Step 5: Record The Authority (So You Can Prove It Later)

Even if you trust your team completely, it’s worth creating an audit trail.

For example:

• keep a copy of the signed/sealed document in a central contract register
• note who applied the seal and on what date
• store any approvals (emails, board minutes, resolutions) alongside it

This is particularly important if your business is growing and responsibilities are being delegated. The last thing you want is a future dispute where nobody can work out who approved a binding commitment.

Common Mistakes With Company Seals (And How To Avoid Them)

When it comes to how company seals in the UK are used, the biggest risk is not “failing to have one” - it’s using one in a way that creates uncertainty.

Here are the pitfalls we see most often.

Mixing Up “Signing A Contract” With “Executing A Deed”

Many commercial contracts can be signed very simply, and you do not need a seal.

But deeds have special execution requirements. If you accidentally label something as a deed (or sign a deed incorrectly), enforcement can become messy.

As a general rule, if the document says “executed as a deed”, slow down and check:

• who is signing for the company
• whether witnessing is required
• whether the execution clause matches what you’re doing in practice

Using A Seal As A Substitute For Proper Authority

A seal doesn’t magically give someone authority to bind the company.

If an employee (or even a director acting outside agreed internal controls) applies the seal without proper approval, you may end up with an internal dispute about whether that commitment should have been made.

This is why pairing bigger signings with board approvals can save a lot of stress later.

Not Following Your Own Company Rules

Your articles of association and internal governance documents matter. If they say “do X before sealing” and you skip X, you’re increasing risk.

This is also where many small businesses get caught out after fundraising, bringing in new shareholders, or scaling a management team - suddenly the “informal” approach stops working.

Assuming A Seal Is Required For “Legal Validity”

Lots of business owners buy a seal because they think it’s a legal requirement, then use it inconsistently.

The better approach is:

• only use a seal if you have a clear reason (counterparty requirement, internal policy, specific deed process), and
• make sure your signing approach follows the legal execution rules, including the statutory requirements if you execute by seal.

If you’re reviewing your signing process generally, it can help to revisit your fundamentals around Legal Signatures so you’re confident your contracts are enforceable from day one.

Key Takeaways

• Most small businesses don’t need a company seal: in modern UK practice, companies can usually execute contracts and deeds through signature-based rules without using a seal.
• Company seals are usually about process, not legal necessity: they can be helpful where counterparties (especially overseas) expect them, or where your company wants extra formality for major transactions.
• Deeds are the main area where execution details matter most: not every “important” agreement must be a deed, but if a document is a deed, make sure it’s executed correctly (whether by authorised signatories, witnessing, or sealing). If you execute a deed by common seal, the seal must be authenticated in line with the Companies Act 2006 (for example, by the signature of two authorised signatories, or by a director in the presence of a witness who attests the signature).
• If you use a seal, use it consistently and correctly: match the execution block, apply the seal clearly, and follow any witnessing requirements.
• Internal authority is crucial: a seal doesn’t replace approvals - consider recording approvals with board minutes or a directors’ resolution for higher-risk commitments.
• Don’t DIY the tricky parts: if you’re unsure whether you need a seal, whether a document is a deed, or who should sign, getting tailored legal advice can prevent expensive disputes later.

If you’d like help setting up a clear signing process (or reviewing a contract or deed before you commit), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.