How UK Law Firms Use Electronic Signatures for Client Agreements

Understanding why electronic signatures are valid requires understanding the legislative foundations that support them.

The Electronic Communications Act 2000 is the foundational statute, confirming that electronic signatures are admissible as evidence in legal proceedings and can satisfy statutory requirements for a signature. Alongside it, the UK eIDAS Regulation — retained in domestic law following Brexit — establishes three categories of electronic signature, each carrying different levels of legal weight and security requirements.

In 2019, the Law Commission published its landmark report on the electronic execution of documents, concluding that electronic signatures are valid for the vast majority of business transactions and legal processes under existing English law, provided the signatory intends to authenticate the document. The UK government endorsed these findings on 3 March 2020, and the Industry Working Group published comprehensive best practice guidance in February 2023.

UK eIDAS recognises three signature categories, and choosing the right one matters in legal practice. Each level balances security, cost, and evidential weight differently.

• Simple Electronic Signatures (SES) are the most basic form — a typed name, a scanned image of a signature, or a checkbox. They carry no inherent technical verification of identity. For low-risk documents where the parties are known to each other, SES is often sufficient.
• Advanced Electronic Signatures (AES) are uniquely linked to the signatory, capable of identifying them, created under their sole control, and designed to detect any tampering with the document after signing. AES relies on cryptographic techniques and provides a significantly stronger evidential position. It's appropriate for higher-value commercial agreements where audit integrity matters.
• Qualified Electronic Signatures (QES) represent the highest tier, requiring a qualified certificate issued by a qualified trust service provider regulated under UK eIDAS. Under UK law, QES carries the same legal effect as a handwritten signature. They are used where the highest level of certainty is required, particularly for cross-border transactions and certain regulated documents. A QES provides the strongest presumption of validity in court.

For a fuller explanation of how these three levels interact with different document types and risk profiles, our guide to secure electronic signatures sets out the practical considerations in detail.

Electronic signatures are suitable for the majority of documents that law firms handle on a daily basis. The following can generally be executed electronically without issue:

• Client care letters and engagement letters — the standard vehicle for confirming the firm's terms of business and scope of work
• Non-disclosure agreements — typically low-formality requirements, making SES or AES appropriate
• Commercial contracts — including supply agreements, service agreements, and licensing arrangements
• Settlement agreements — provided both parties have independent legal advice, which is a separate requirement from the execution method
• Employment contracts — for law firms as employers, as well as in advisory capacity for employment clients
• Powers of attorney — can be executed electronically (except Lasting Powers of Attorney, which currently require wet ink signatures) subject to the specific requirements of the relevant jurisdiction

The shift to electronic signatures isn't just about replacing paper — it's about fundamentally improving how law firms operate. Here's where the impact shows up in practice:

• Faster transaction execution. In transactional practice, the time between a document being agreed and it being fully executed has historically been a source of delay and frustration. Electronic signature platforms allow all parties, including those in different time zones or jurisdictions, to sign simultaneously. What previously took days of coordinating couriers and diary appointments can be completed in hours.
• Cleaner audit trails. Every electronically signed document generates a timestamped record showing who signed, when, from which device, and in what order. This is often stronger evidence than a wet ink signature, where the circumstances of signing may be difficult to reconstruct. For law firms advising on disputes or managing risk, this audit trail has real value.
• Improved client experience. Clients increasingly expect the same digital convenience from their legal advisors that they receive from their banks and insurers. Being asked to print, sign, scan, and return a document creates friction that reflects poorly on a firm's operational sophistication. Electronic signing removes that friction entirely — and that's where the difference shows.
• Reduced administrative overhead. Chasing signatures, managing physical document flows, and maintaining paper archives consume significant fee-earner and support staff time. Platforms that automate reminders, track signing status in real time, and store executed documents centrally reduce that burden substantially.
• Support for remote and hybrid working. The normalisation of remote working has made physical document execution logistically complex. Electronic signatures remove location as a constraint, allowing matters to progress regardless of where solicitors or clients are based.

The GOV.UK Industry Working Group on Electronic Execution of Documents published its final report in February 2023, setting out best practice guidance for organisations adopting electronic signatures. The Law Society has also published detailed guidance for solicitors in its practice note on execution of documents using electronic signatures. For law firms, several principles are particularly relevant:

• Develop a firm-wide e-signature policy. Not every document should be signed the same way. A clear policy should specify which signature level is required for different document types, who is authorised to send documents for signature, and what identity verification steps apply. Without a policy, individual fee-earners make inconsistent choices that create risk.
• Match the signature level to the transaction. Using a simple electronic signature for a high-value cross-border acquisition document is a different risk decision from using it for a standard engagement letter. Fee-earners should understand the difference between SES, AES, and QES and be guided on when each applies. The Law Society Practice Note provides useful recommendations on signature selection as best practice guidance.
• Ensure informed client consent. While there is no legal requirement to obtain explicit consent to electronic signing in most cases, it is good practice to confirm in the engagement letter or covering email that documents will be executed electronically. This avoids any subsequent challenge to the method of execution.
• Maintain records of the signing process. The platform's audit trail should be stored alongside the executed document, not just the document itself. If execution is ever challenged, the audit trail is the primary evidence of how and when the document was signed. Ensure your trust service provider delivers comprehensive, tamper-evident records.
• Review for document-specific requirements. Before sending any document for electronic signature, confirm whether it has specific formality requirements under statute, case law, or the applicable contract. Deeds, land transactions handled by conveyancers, certain financial agreements, and cross-border documents may require additional steps or a higher signature level. For deeds affecting registered land, follow HM Land Registry Practice Guide 82 requirements.

For firms moving from a predominantly paper-based approach, the transition works best as a phased process rather than a firm-wide switch on a single date.

Start with the highest-volume, lowest-risk documents: engagement letters, NDAs, and standard commercial contracts. These involve minimal formality requirements and will deliver the fastest operational gains. Use the first phase to train staff, refine internal processes, and build client familiarity with the signing experience.

In the second phase, extend electronic signing to more complex documents: settlement agreements, employment contracts, and shareholder documents. By this stage, the firm will have developed internal expertise on which signature level to use and how to handle any client queries about the process. Fee-earners will understand when a qualified certificate is necessary and when AES suffices.

Reserve the third phase for specialist areas such as property transactions handled by conveyancers and regulated financial documents, where specific platform requirements and procedural steps apply. Deeds require careful attention to Land Registry requirements and physical witnessing. These require closer coordination with platform providers and, in some cases, external counsel or specialist guidance.

Yousign's platform supports all three signature levels under UK eIDAS, with a complete audit trail for every document and a signing process that requires no software installation for recipients. For law firms managing multi-party transactions, the platform allows sequential or parallel signing workflows, real-time status tracking, and centralised document storage — all within a legally compliant framework. Our trust service provider credentials ensure full regulatory compliance.

Electronic signatures aren't a workaround or a convenience measure — in UK law, they are a legally recognised and often evidentially stronger method of execution than wet ink. For law firms, adopting them is both a compliance decision and a competitive one. Clients expect it, the legal framework supports it, and the operational gains are material.

The transition requires a clear policy aligned with professional guidance, the right platform from a regulated trust service provider, and a phased approach that matches signing methods to document types. Firms that get this right reduce friction for clients and fee-earners alike, while building a more robust documentary record of every transaction they handle.

Whether you're a solicitor handling commercial contracts, a conveyancer navigating Land Registry requirements for deeds, or an in-house legal team managing high-volume client agreements, the principles remain the same: match the signature level to the risk, maintain comprehensive audit trails, and ensure your platform delivers UK eIDAS compliance.