Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice.
Updated June 2026 · England & Wales
A company's constitution sets the ground rules for how the business operates, how directors are appointed and act, how shareholders vote, and how key decisions get made. Over time, those rules can start to feel restrictive or simply out of step with where the business has gone.
Perhaps you want to bring in new share classes, tighten up director powers, or update provisions that were lifted from a template when the company was first incorporated. Whatever the reason, changing the constitution is a formal process under the Companies Act 2006, and getting the paperwork wrong can cause real headaches later on.
This guide walks you through what the constitution actually contains, when changes are allowed, and the practical steps involved in amending it properly.
Overview
For companies formed under the Companies Act 2006, the constitution is made up primarily of the Articles of Association, along with any resolutions and agreements that affect the constitution (covered by section 29 of the Act). The Articles are the internal rulebook: they cover things like how directors are appointed and removed, how board and shareholder meetings run, voting rights attached to shares, dividend procedures, and how shares can be transferred or issued.
For companies formed before October 2009, the old-style Memorandum of Association is treated as part of the Articles for anything it contained beyond the basic formation details. Newer companies have a much shorter Memorandum that simply records the initial subscribers' intention to form the company.
When people talk about 'changing the constitution', they usually mean amending the Articles, adopting a brand new set of Articles, or passing resolutions that override or modify what the current Articles say. Any of these changes has legal effect on the company, its directors, and its shareholders, so the process must be followed properly.
Key steps
Work out exactly what needs to change. Read through your current Articles carefully and identify the specific clauses you want to amend, remove, or add. Think about whether you need targeted amendments or a full replacement set of Articles. Common triggers include bringing in investors, introducing new share classes, or moving away from default model articles.
Draft the amended Articles or the amending resolution. The wording needs to be precise. Vague or contradictory clauses cause problems later, especially if there is ever a shareholder dispute. If you are replacing the Articles in full, make sure transitional provisions and any entrenched clauses are handled correctly, as entrenched provisions have extra procedural hurdles.
Convene a general meeting or arrange a written resolution. Changes to the Articles require a special resolution, which means at least 75% of the votes cast must be in favour. Private companies can use a written resolution circulated to all eligible members; public companies must hold an actual meeting. Give the correct notice period and follow any quorum rules in your existing Articles.
Pass the special resolution. Record the vote carefully. If you are using a written resolution, you need signatures or agreement from holders of at least 75% of the total voting rights, not just 75% of those who respond. Keep the signed resolution or meeting minutes on file as part of the company's statutory records.
File everything with Companies House within 15 days. You must submit a copy of the special resolution and a copy of the amended Articles (or the new Articles in full) within 15 days of the resolution being passed. Filing late is an offence. Once filed, the changes take effect and the public record is updated.
Q What level of shareholder approval do I need to change the Articles?
Amending the Articles of Association requires a special resolution, which means at least 75% of the votes cast by shareholders entitled to vote must be in favour. Private companies can pass this as a written resolution without a physical meeting, provided the 75% threshold is met across all eligible voting rights. Some Articles contain entrenched provisions that need an even higher threshold or additional steps, so always check the existing wording first.
Q How long do I have to send the changes to Companies House?
You have 15 days from the date the special resolution is passed to file a copy of the resolution and a copy of the amended or new Articles with Companies House. Missing this deadline is a criminal offence for the company and its officers, although in practice late filing is usually dealt with by simply filing as soon as possible. The changes take effect once filed and appear on the public record.
Q Can shareholders block a change to the Articles?
A special resolution needs 75% support to pass, so a minority holding more than 25% of the voting rights can block it. Beyond voting, shareholders who believe an amendment unfairly prejudices their interests may have grounds to challenge it in court, particularly if it targets a specific minority or strips away existing rights. Changes must also be made 'bona fide for the benefit of the company as a whole', which is a long-standing legal test.
Q Do I still need a Memorandum of Association if my company was formed before 2009?
Yes, but its role has changed. For companies incorporated before 1 October 2009, provisions in the old Memorandum that are not required for the newer, shorter form are now treated as part of the Articles under the Companies Act 2006. You can remove or replace these provisions using the same special resolution process used to amend the Articles. Newly formed companies only have a short Memorandum that cannot be amended.
Q What happens if we pass changes but never file them?
The amendments are still binding internally between the company and its members once the resolution is properly passed, but failing to file with Companies House is a breach of the Companies Act 2006. The company and every officer in default commit an offence and may face a fine. It also creates confusion, because the public record will not match how the company is actually being run, which can cause issues during due diligence or investment rounds.
Q Can we adopt the model articles instead of drafting our own?
Yes. Most private companies limited by shares can adopt the default model articles set out in regulations under the Companies Act 2006. You can adopt them in full, adopt them with specific modifications, or replace them entirely with bespoke Articles. Switching to model articles is done the same way as any other amendment: a special resolution, followed by filing with Companies House within 15 days.
Q Is changing the company name the same as changing the constitution?
They are related but separate processes. A name change is usually done by special resolution and filed on form NM01, and it updates the company's name on the register. It does not by itself change the internal rules in the Articles. If your Articles contain a specific procedure for changing the name (some do), you need to follow that route instead. Either way, the name change takes effect when Companies House issues the new certificate of incorporation on change of name.
Amending a company's constitution affects how directors act, how shareholders vote, and how future decisions get made, and the wording matters. An experienced legal adviser can help you think through the implications based on what you describe on the call, so you go into the process with your eyes open.
✓A plain-English explanation of how the amendment process works for your situation
✓Practical perspective on what to watch out for when drafting or adopting new Articles
✓Answers to your specific questions about resolutions, filings, and shareholder approval
✓Clarity on your next steps based on what you describe on the call
Personal call · For information only · Independent advisers
Written & reviewed by
Brad Askew Solicitor (non-practising)
Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.