A key undertaking in conveyancing is a formal promise made by a solicitor or conveyancer to do something important within a property transaction. In simple terms, it is a professional assurance that one party’s solicitor gives to another, often to help a sale, purchase, remortgage, or transfer of equity progress safely and in the right order. Undertakings are taken seriously in residential conveyancing because other parties rely on them when releasing money, completing a transfer, or agreeing to complete before all documents are physically available.
For clients, the main point is that an undertaking helps keep a transaction moving. It can bridge the gap between what must happen legally and what can happen practically on completion day. At RFB Legal, our residential property solicitors regularly deal with undertakings in a wide range of conveyancing matters across England and Wales, always with a focus on clarity, compliance, and protecting our clients’ interests.
What is a conveyancing undertaking?
An undertaking is a binding professional promise. In conveyancing, it usually means a solicitor agrees to take a specific action by a certain time, such as sending money to redeem a mortgage, delivering deeds, registering a transfer, or obtaining and forwarding a document. Because it is given by a legal professional, it carries weight and is expected to be honoured.
Undertakings are common in residential property transactions because the chain of events is often tightly linked. One side may need confirmation that a mortgage will be repaid, or that a title restriction will be removed, before they are willing to complete. The undertaking gives that reassurance.
Examples of undertakings in conveyancing may include:
- the seller’s solicitor undertaking to use sale proceeds to repay an existing mortgage
- the buyer’s solicitor undertaking to send completion funds on completion day
- a solicitor undertaking to register a transfer or mortgage at HM Land Registry
- an undertaking to forward signed documents or title deeds once received
- an undertaking to obtain a landlord’s licence, consent, or release where required
Why undertakings matter in residential conveyancing
Undertakings matter because they help make complex property transactions workable. In many cases, completion cannot happen perfectly in one step. There may be documents still in the post, mortgage funds arriving at the last minute, or a lender requiring confirmation that certain tasks will be completed after completion.
Without undertakings, many transactions would be delayed. They are especially useful in:
- property purchases and sales
- remortgages
- transfers of equity
- leasehold conveyancing
- buy-to-let transactions
- chain transactions involving several linked completions
For clients, the practical benefit is momentum. A well-managed undertaking can help ensure a transaction completes on time while still protecting the legal position of everyone involved.
What is a key undertaking in conveyancing practice?
A key undertaking is usually one that is central to completion or to the post-completion steps needed to finalise the matter. It is not necessarily the most dramatic promise, but it is often the one that the other party or lender is depending on most.
For example, in a purchase with a mortgage, a buyer’s solicitor may give an undertaking to the seller’s solicitor that the mortgage deed will be submitted for registration promptly after completion. In a sale, the seller’s solicitor may undertake to repay the existing mortgage from the sale proceeds and obtain a release of the charge. In a transfer of equity, a solicitor may undertake to register the transfer and any new mortgage and to provide updated title information once completed.
In practice, a key undertaking is one that:
- is essential to the transaction progressing
- supports completion or post-completion obligations
- relates to a legal or lender requirement
- is capable of being performed within a clear timeframe
Because undertakings can affect title, mortgage security, and the completion of the chain, they must be accurate and realistic. A solicitor should only give an undertaking where it can properly be met.
How the undertaking process usually works
The process normally begins when one solicitor asks the other for confirmation that a specific step will be carried out. This often happens during pre-completion correspondence. The undertaking is then drafted clearly, usually in writing, so that both sides understand exactly what is promised, when it must be done, and what documents or funds are involved.
A typical sequence may look like this:
- one party raises a request connected to completion or registration
- the other solicitor checks whether the request is reasonable and achievable
- if appropriate, the solicitor gives a written undertaking
- the transaction completes
- the solicitor then carries out the promised action within the agreed timeframe
For example, in a remortgage, a lender may require the borrower’s solicitor to undertake to register the new mortgage at HM Land Registry after completion and to send evidence of registration once available. That undertaking helps the lender know its legal charge will be properly protected.
Common examples in buying, selling, and remortgaging
In a house purchase, undertakings often relate to mortgage registration, the return of documents, or ensuring that completion funds are used correctly. A buyer may not see these steps directly, but they are important behind the scenes.
In a sale, the seller’s solicitor may give an undertaking to redeem the old mortgage from the sale proceeds and deal with any remaining title matters. If the property is leasehold, there may also be undertakings connected to service charge apportionments, notices to the landlord, or the transfer of management information.
In a remortgage, undertakings are especially common because one lender is replacing another. The new lender may require assurance that the old charge will be removed and the new charge registered. The borrower’s solicitor may also need to promise to send the new lender an updated title report once registration is complete.
In a transfer of equity, undertakings may involve registering the new ownership structure, notifying a mortgage lender, or dealing with any release of a departing owner from mortgage liability, depending on the lender’s requirements.
Risks, mistakes, and issues to watch for
Although undertakings are routine in conveyancing, they must be handled carefully. A poorly worded or unrealistic undertaking can create delay, professional risk, or dispute.
Common issues include:
- unclear wording – if the promise is vague, it may be difficult to know what has to be done
- missing deadlines – undertakings should usually have a realistic timescale
- reliance on third parties – if a promise depends on a lender, landlord, or another solicitor, delays can arise
- incomplete documentation – missing title papers, mortgage information, or landlord consents can affect performance
- incorrect assumptions – for example, assuming a charge can be removed immediately when lender procedures require more time
For clients, the risk is usually indirect, but it can still affect timing and stress levels. If an undertaking cannot be met, the transaction may be delayed, and in some cases further legal steps may be needed. This is why experienced residential property solicitors take care to check details before committing to anything.
How RFB Legal helps clients with undertakings
At RFB Legal, our conveyancing team understands that clients want their property matter to progress smoothly and with as few surprises as possible. We handle undertakings as part of a wider, practical approach to residential conveyancing, whether you are buying your first home, selling a property, remortgaging, transferring equity, or dealing with a leasehold transaction.
We can help by:
- explaining any undertaking in plain English
- checking that the wording is accurate and appropriate
- making sure timeframes are realistic
- coordinating with lenders, solicitors, and other parties
- dealing with post-completion registration and related steps
- keeping you updated on progress and any outstanding issues
Our aim is to reduce avoidable delays and help protect your position throughout the transaction. Because undertakings form part of the wider legal process, it is important that they are managed by a solicitor or conveyancer who is familiar with residential property law and lender requirements.
Frequently asked questions
Is a conveyancing undertaking legally binding?
Yes. A solicitor’s undertaking is a serious professional commitment. It should only be given where the solicitor is satisfied it can be fulfilled.
Do clients give undertakings themselves?
Usually, no. Undertakings in property transactions are normally given by solicitors or licensed conveyancers, not by clients personally.
Can an undertaking delay completion?
It can, if the other side will not proceed without it or if the undertaking relates to a step that has not been properly arranged. Clear communication often helps avoid this.
What should I do if I do not understand an undertaking in my file?
Ask your conveyancer to explain it. It should be possible to describe the promise and its purpose in straightforward terms.
Are undertakings the same as guarantees?
Not exactly. In conveyancing, an undertaking is a professional promise to do a specific thing. It is different from a general guarantee and is usually tied to a defined legal task.
Speak to a conveyancing solicitor for tailored advice
If you are dealing with a purchase, sale, remortgage, transfer of equity, or leasehold matter and want advice on any undertaking in your transaction, RFB Legal can help. Our residential property solicitors provide clear, practical support designed to keep matters moving while protecting your legal position. Because every transaction is different, it is always sensible to seek advice based on your own circumstances.
Disclaimer: This article is provided for general information purposes only and does not constitute legal advice. The law may have changed since the date of publication, and the information contained in this article may not be applicable to your specific circumstances. You should not rely on this article as a substitute for obtaining legal advice tailored to your individual situation. No solicitor-client relationship is created by reading, accessing, or acting upon the information contained herein. Whilst Ronald Fletcher Baker LLP makes reasonable efforts to ensure that the information is accurate and up to date at the time of publication, no warranty, express or implied, is given as to its accuracy, completeness, or suitability. Ronald Fletcher Baker LLP accepts no responsibility or liability for any loss arising from reliance on the information contained in this article. If you require legal advice regarding your particular circumstances, please contact a qualified member of our team.”
