Company Constitution: What It Is, What It Includes, And Why You Need One

If you’re running (or about to launch) a UK company, you’ll hear a lot of talk about your company constitution. It can sound like something only big corporates worry about.

But in reality, your company constitution is one of the most practical documents you’ll rely on as a small business owner - especially when you bring in a co-founder, raise investment, issue shares, appoint directors, or need to make an important decision quickly.

In this guide, we’ll break down what a company constitution is in the UK, what the constitution of a company usually includes, and why getting it right early can save you time, cost, and disputes later.

What Is A Company Constitution In The UK?

A company constitution is the set of rules that governs how your company is run. It’s the internal “rulebook” for:

• how decisions are made (by directors and shareholders);
• what powers directors have;
• what rights shareholders have; and
• how key events happen (like issuing shares, paying dividends, or transferring shares).

In UK company law, the constitution of a company has a specific legal meaning under the Companies Act 2006. Broadly speaking, it includes:

• the company’s articles of association; and
• certain resolutions and agreements that affect the company’s constitutional arrangements (for example, shareholder resolutions adopting new articles).

For most small businesses, the most important part of the company’s constitution is the Articles of Association. These are the default governance rules of your company.

It’s also common for founders and shareholders to put a separate contract in place alongside the articles - a Shareholders Agreement - which covers commercial “deal terms” and extra protections that aren’t always included in articles.

Is A Company Constitution The Same As A Shareholders Agreement?

Not exactly.

Your articles of association are adopted as part of your company’s formal structure and are tied to Companies House processes. A shareholders agreement is a private contract between the shareholders (and usually the company too) that can add more detailed rules.

They should work together - and ideally be consistent - but they’re not identical documents.

What About The “Model Articles”?

When you incorporate a company in the UK, you can adopt standard default articles called the Model Articles. Many founders do this to get started quickly.

That’s totally normal - but it’s worth knowing that Model Articles are designed to be a “one size fits many” solution. As soon as your business has multiple shareholders, different share classes, investors, or bespoke decision-making needs, Model Articles can start to feel a bit thin.

What Does A Company Constitution Include?

The phrase “company constitution” can feel broad, so it helps to break it down into the parts you’ll actually use in real life.

1. Articles Of Association

Your articles of association sit at the core of your company constitution. They set the internal rules for how the company is managed and controlled.

While the details vary, articles usually cover things like:

• Director powers (who can make decisions, and how directors pass board resolutions)
• Appointment and removal of directors
• Shareholder decision-making (how votes work, notice requirements for meetings, written resolutions)
• Shares (issue of shares, share transfers, and sometimes pre-emption rights)
• Dividends (how they can be declared and paid)
• Administrative points (company seal if used, record keeping, communications)

Articles are especially important because they’re the baseline governance rules a bank, investor, buyer, or sometimes even a supplier may ask about during due diligence.

2. Shareholder Resolutions And Certain Agreements

In legal terms, the constitution of a company can also include shareholder resolutions and agreements that affect the company’s constitution.

In plain English: if shareholders pass a formal resolution changing governance rules (for example, adopting new articles), that forms part of the constitutional framework.

This is why it’s important to document decisions properly - not just in email chains or informal messages.

For example, if you:

• adopt new articles;
• create different share classes;
• approve a share issue; or
• change key company details that require a formal decision (such as the company name or share capital),

you’ll usually want to record this with a properly drafted Company Resolution and make sure Companies House filings are handled correctly where required.

3. (Often) A Shareholders Agreement Alongside The Constitution

Strictly speaking, a shareholders agreement isn’t always described as part of the “company constitution” in the same way articles are - but in practice, it often functions like an extension of your governance framework.

This is where you usually deal with the “real world” issues founders care about, like:

• what happens if a co-founder wants to leave;
• who can sell shares to an outsider;
• how deadlocks are resolved;
• reserved matters (decisions that require shareholder approval);
• how dividends will be handled in practice; and
• confidentiality and restraints (depending on your business and bargaining power).

It’s common for companies to keep the articles fairly standard and use a shareholders agreement to reflect the founders’ deal - but it depends on your setup and what you’re trying to achieve.

Why Does Your Business Need A Company Constitution?

When you’re busy building your product, finding customers, and watching cashflow, it’s tempting to treat governance documents as “admin”.

But a well-structured company constitution is one of those behind-the-scenes foundations that helps your business run smoothly - especially when something unexpected happens.

It Helps Prevent Founder And Shareholder Disputes

Many small business disputes aren’t about the core business idea - they’re about decision-making, ownership, and control.

For example:

• One director thinks they can sign contracts alone; another thinks board approval is required.
• A shareholder wants to sell their shares to a third party, but the other founders want to keep ownership “in-house”.
• Founders disagree on whether to reinvest profits or pay dividends.

Your company constitution (and any supporting agreement) gives you a clear rulebook to fall back on. That clarity can be the difference between a quick resolution and months of costly conflict.

It Makes Day-To-Day Decisions Cleaner And More Defensible

As your company grows, you’ll start making more formal decisions - opening a business bank account, appointing directors, signing leases, hiring staff, issuing shares, taking loans, and so on.

Many of those steps require board approvals or shareholder approvals, and the constitution of the company determines:

• who needs to approve what;
• how approvals are validly passed; and
• what records you should keep.

This isn’t just “paperwork”. If a decision is challenged later (by a shareholder, investor, or buyer), having properly followed your company constitution can protect the company and its directors.

It Helps You Bring In Investors (Without Chaos)

If you plan to raise investment, your company’s constitution is going to matter. Investors commonly want to see that:

• the company’s governance makes sense;
• share rights are clearly documented;
• there are rules around new share issues and transfers; and
• major decisions can’t be made without the right approvals.

Even if you’re not raising a full “round”, a small investment from a friend or angel can trigger these issues.

Putting good governance in place early can also make your company look more credible - because it shows you’re set up properly and you understand your obligations as a director.

It Supports Proper Contracting And Signing Authority

In a growing business, people often assume that “a director can sign anything” or “the founder can just approve it”.

But the safer approach is to check what your constitution says, and then execute documents correctly - especially for high-value contracts or anything that needs to be signed as a deed.

If you’re signing important documents, it’s worth understanding the practical rules around Executing Contracts and when you may need a witness (and who qualifies) under Witness A Signature requirements.

It Gives You A Framework For Growth (Not Just Compliance)

A company constitution isn’t only about “legal compliance”. It’s also about building a business that can scale without everything needing to be renegotiated each time you hit a milestone.

Think of it like this: if your business is doing well, the stakes get higher. Decisions matter more, ownership becomes more valuable, and misunderstandings become more expensive.

Getting your company’s constitution right early helps you grow with confidence.

How Do You Put A Company Constitution In Place (Or Update One)?

The steps depend on where your business is at right now: starting from scratch, already incorporated, or bringing in new shareholders.

Here’s the typical process in plain terms.

1. Register Your Company With The Right Starting Point

If you haven’t incorporated yet, you’ll choose which articles to adopt when you set up the company (often Model Articles, unless you upload bespoke ones).

This usually happens during incorporation, alongside other basics like share structure and registered office details. If you’re at this stage, it’s worth getting the setup right from day one when you Register A Company.

2. Identify Where Your Current Constitution Doesn’t Match Your Business

If you’re already running a company, it’s common to discover later that the company constitution doesn’t reflect how the business actually operates.

Some common triggers for an “upgrade” include:

• bringing on a co-founder or issuing shares to a key team member;
• taking on investment;
• setting up different share classes (for example, non-voting shares);
• introducing stricter controls on selling shares;
• changing how directors make decisions; or
• preparing for a sale of the business.

This is where you’ll often look at updating articles and putting a shareholders agreement in place (or updating an old one).

3. Pass The Right Approvals

Changing a company’s constitution usually requires formal shareholder approval, often via a special resolution (depending on what you’re changing).

From a practical perspective, you’ll want:

• the correct resolution wording;
• accurate company records; and
• the right Companies House filings (where required).

This is one of those areas where getting the process wrong can create headaches later - because you can end up with a document that looks right, but wasn’t validly adopted.

4. Make Sure Your Constitution Aligns With Your Other Legal Documents

Your company constitution doesn’t exist in a vacuum. It should “match” your other key contracts and policies.

For example:

• If you’re hiring staff, your governance structure should support how you approve headcount and manage authority, alongside a solid Employment Contract.
• If you’re entering major supplier deals, you’ll want clarity on who can sign and what approvals are required.
• If you’re using templates or informal arrangements, it’s worth remembering the basics of Legally Binding Contracts so you don’t assume you’re protected when you’re not.

It can feel like a lot, but the upside is huge: once your foundations are aligned, decisions and growth become much smoother.

5. Don’t Rely On Generic Templates If Your Structure Is Anything But Simple

For a single-director, single-shareholder company with no plans to raise funds or bring in other owners, Model Articles might be enough for a while.

But as soon as you have:

• two or more founders,
• different contributions (money vs sweat equity),
• plans to raise investment, or
• a need for tighter control over decisions,

it’s usually worth getting your constitution and related agreements professionally drafted or reviewed. The goal isn’t to overcomplicate things - it’s to make sure the documents reflect how your business actually needs to run.

Key Takeaways

• A company constitution is your company’s internal rulebook. In the UK, it primarily includes the articles of association and certain shareholder resolutions and agreements under the Companies Act 2006.
• Your constitution of a company matters most when you have multiple founders, bring in investors, issue shares, appoint directors, or need to make major decisions quickly and properly.
• Well-drafted articles (and often a shareholders agreement alongside them) help prevent disputes by clearly setting out decision-making powers, voting rules, and share rights.
• Updating a company’s constitution usually requires proper approvals and good paperwork - it’s not just a matter of “saving a new version”.
• As your business grows, your company’s constitution should align with how you sign contracts, manage authority, and run operations day to day.

If you’d like help putting the right company constitution in place - whether that’s updating your Articles of Association, drafting a Shareholders Agreement, or documenting key decisions - you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.