Undertakings: Risk and Compliance for Solicitors

An undertaking is one of the few things a solicitor can say or write that becomes binding the moment it is given — no signature, no consideration, no separate contract required. That makes undertakings one of the most useful tools in practice: they let transactions complete, funds move and deadlines get met on the strength of a professional's word. It also makes them one of the riskiest. The Solicitors Regulation Authority (SRA) treats a broken undertaking as a serious regulatory matter, and the courts will enforce one regardless of what the solicitor actually intended. This guide covers what makes an undertaking binding, why regulators and courts take them so seriously, the conveyancing and costs scenarios that generate the most complaints, how to word an undertaking so it doesn't come back to bite you, and what to do if you find you can't comply with one you've already given. If undertakings are part of your CPD planning this year, they're a genuinely high-value topic — the risk is real and the fixes are mostly about habits, not law.

What Makes an Undertaking Binding

An undertaking is a statement, given by a solicitor in a professional capacity, that they will do something or refrain from doing something — or that a specified state of affairs exists or will exist — on which the recipient is entitled to rely. It does not need to include the word "undertake." A letter that says "we confirm we hold the deposit and will release it to you on completion" can be read as an undertaking even without that label, if a reasonable recipient would understand it as a firm promise being relied upon. The SRA's guidance on undertakings makes clear that intention is judged objectively: how the words would reasonably be understood by the person receiving them, not what the solicitor privately meant.

Three features set undertakings apart from ordinary professional promises. First, they are enforceable without proof of reliance or loss — the court's jurisdiction over solicitors as officers of the court means a breach can be summarily enforced, historically through cases such as Udall v Capri Lighting, which confirmed that an undertaking given in a solicitor's professional capacity binds them personally even where they acted without authority from, or in excess of instructions from, their client. Second, an undertaking binds the individual who gives it, and often the firm as a principal, even after that solicitor leaves the firm or the retainer ends. Third, undertakings given by or on behalf of a firm bind everyone within the giver's control — the SRA's Code of Conduct for Solicitors requires that you perform, in a timely manner, all undertakings given by you and by others within your control. That last point catches out more solicitors than any other: a trainee's or paralegal's undertaking, given on your file under your supervision, is treated as yours.

Why the SRA Treats Undertakings So Seriously

The SRA's enforcement approach to undertakings is unusually strict, and it is worth understanding why. Undertakings are what allow the profession to transact quickly — a completion can proceed, funds can be released, a document can be handed over, all on the strength of a solicitor's word rather than a slower, more formal legal mechanism. That efficiency only works if the promise is dependable. Once solicitors' undertakings can't be relied on without qualification, the whole shortcut collapses and every transaction slows down to protect against the risk of a broken one.

That is why the SRA and the courts apply strict, and largely intention-blind, enforcement. It does not generally matter that a solicitor gave an undertaking in good faith, was let down by a client or a third party, or made an honest drafting error — the breach is still a breach, and it is still capable of amounting to professional misconduct regardless of whether anyone suffered financial loss. Liability is also personal: a solicitor who gives an undertaking remains answerable for it even where the firm later closes, is sold, or the individual moves elsewhere, and even where they no longer control the funds or documents needed to comply. Because of this personal exposure, the Law Society and regulators increasingly caution against a solicitor giving an undertaking purely in their own name where the firm, not the individual, should properly be the party bound — get that wrong and you can find yourself personally on the hook long after the file is closed.

Common Scenarios Where Undertakings Go Wrong

Conveyancing completion undertakings

Conveyancing generates more undertaking disputes than any other area of practice, largely because completions move fast and rely on chains of trust between firms that have never dealt with each other before. The classic scenario: a seller's solicitor undertakes to redeem an existing mortgage from the sale proceeds and send confirmation of discharge to the buyer's solicitor. If that redemption is delayed — because the lender is slow, the completion statement is wrong, or the firm simply doesn't action it promptly — the undertaking is still broken, even though the solicitor did nothing dishonest. Other frequent flashpoints include undertakings to hold a retention against defects, to forward original documents post-completion, and to discharge outstanding charges on leasehold titles. Because these promises sit right at the point where fraud risk, funds handling and time pressure collide, it's worth reading undertakings alongside the wider fraud controls covered in our guide to residential conveyancing risk and fraud — many of the same file-management habits that catch fraud also catch undertaking failures before they happen.

Costs undertakings

Costs undertakings are the second major risk area, particularly in litigation and matrimonial work. A common example is an undertaking to discharge another party's costs from settlement proceeds, or to meet a barrister's fees, or to pay an expert's invoice once a case concludes. These become dangerous when the underlying funds don't materialise as expected — a case settles for less than anticipated, a client disputes the fee, or money is spent on something else before the undertaking is honoured. Because costs undertakings are promises about money the solicitor may not yet control, they deserve the same discipline you'd apply to any client-facing commitment about fees and billing; see our guide to price transparency and costs communication for the wider standard the SRA expects when money and client expectations meet. The safest approach is to undertake only to pay from a specific, identified fund, and never to give a costs undertaking that depends on a client doing something you cannot compel or guarantee.

How to Word an Undertaking Carefully

Most undertaking problems are drafting problems, and most of them are avoidable with a few consistent habits before the wording leaves your outbox.

• Only promise what is within your control. Never undertake to do something that depends on a third party — a lender, a client, another firm — unless you build in an explicit condition or caveat that makes that dependency clear.
• Be precise about timing. "As soon as reasonably practicable" is safer than a fixed date you can't guarantee; if a client or third party needs a hard deadline, only commit to one you are confident you can meet.
• Identify the exact fund, document or act. Vague undertakings ("we will deal with the mortgage") create more disputes than specific ones ("we will redeem the Nationwide mortgage referenced XXXX from the sale proceeds within five working days of completion").
• Get sign-off before it goes out. Firms with a costs or conveyancing undertaking causing real exposure almost always trace it back to one given without a second pair of eyes — many firms now require any undertaking above a certain value, or outside standard wording, to be checked by a partner or the risk and compliance team before it is sent.
• Keep a central undertakings register. A file note alone is easy to lose track of. A firm-wide log of open undertakings, with the person responsible and the date given, is the single most effective control against one quietly falling through the cracks when a fee earner is away or a file changes hands.
• Never give an undertaking you are not authorised to give. If you are not sure whether you have authority to commit the firm or a fund, say so and ask, rather than assuming it will be fine — remember that lack of authority from your client is no defence once the undertaking is given.

What to Do If You Can't Comply

Sometimes, despite every precaution, a solicitor realises they cannot — or can no longer — comply with an undertaking they've given: a client instructs them not to, funds don't arrive, or circumstances change. The instinct to go quiet and hope the problem resolves itself is the worst possible response, and it is the pattern that turns a difficult situation into a disciplinary one.

• Tell the recipient immediately. Notify the person you gave the undertaking to as soon as you know there is a problem, before the deadline passes rather than after. Early, honest disclosure is treated very differently by both the recipient and any regulator from a silent failure discovered later.
• Explain what has changed and propose a way forward. Set out clearly why compliance isn't currently possible and what you propose instead — an extended timeframe, an alternative form of security, or a partial performance while the rest is resolved.
• Do not simply refuse on your client's instructions. A client cannot instruct you to breach an undertaking you have already given; your obligation to the recipient exists independently of your retainer, and you remain bound even if your client tells you not to comply.
• Escalate internally straight away. Tell your supervising partner, COLP or risk and compliance function without delay — firms deal far better with a problem raised early than one they discover through a complaint.
• Consider whether the matter needs reporting. A breach that involves dishonesty, or one that causes real loss, may trigger a reporting obligation to the SRA. Where the position is genuinely unclear, seeking advice from your firm's risk team or from the Law Society's Professional Ethics helpline before deciding is far safer than guessing.
• Document everything. A clear, contemporaneous record of what was communicated, when, and why shows a regulator or court that the response was managed responsibly, even if the underlying breach could not be avoided.

None of this removes the seriousness of a broken undertaking, but a solicitor who flags the problem immediately, explains it honestly and works to put it right is in a fundamentally different position — professionally and reputationally — from one who lets the recipient find out on their own.

Frequently Asked Questions

Does an undertaking have to be in writing to be binding?

No. A verbal undertaking given by a solicitor in their professional capacity is just as binding as a written one — it is simply much harder to prove what was said, which is exactly why good practice is to confirm any verbal undertaking in writing immediately afterwards.

Can a solicitor be personally liable for an undertaking even after leaving the firm?

Yes. An undertaking given in a professional capacity binds the individual who gave it, and that personal liability does not automatically end when they change firms, retire, or the client relationship ends. This is one of the main reasons firms are cautious about how undertakings are worded and who is authorised to give them.

Is intent relevant to whether a breach of undertaking is misconduct?

Intent affects the severity of any regulatory response, but it does not usually prevent a breach from being a breach. The SRA and the courts generally enforce undertakings regardless of whether the solicitor acted in good faith, was let down by a third party, or made an honest mistake.

What's the difference between an undertaking and a normal promise in correspondence?

Any statement a solicitor makes that a reasonable recipient would understand as a firm, reliable commitment — given in a professional capacity — can be treated as an undertaking, whether or not the word "undertake" appears. That is why careful, precise wording matters even in routine correspondence.

Undertakings sit at the sharp end of legal risk and compliance — low cost to give, high cost to get wrong. Learnsignal's CPD courses for legal professionals cover undertakings, conveyancing risk and the other SRA compliance topics solicitors need to stay current on, with practical, scenario-based learning designed to fit around practice.