For most law firms, the legal retainer is the starting point of every client relationship. It sets out how legal representation will be provided, how clients pay for that representation, and on what terms the engagement operates. It is, in short, the foundation on which everything else is built.

What many legal professionals do not fully appreciate is that a retainer which fails to meet compliance requirements can have serious consequences that extend well beyond the solicitor-client relationship. A defective fee agreement can affect your ability to invoice your own client. By the time the issue comes to light, the damage may already be difficult to undo.

What Does a Legal Retainer Actually Do?

A legal retainer is the fee agreement between a law firm and the client it has agreed to act for. It defines the terms and conditions of the engagement, including the basis on which the cost of legal services will be calculated and charged.

In practice, retainers take several forms. Hourly rate arrangements remain common in commercial and civil litigation, where clients pay for time spent on their matter at an agreed rate per hour. Fixed fee and flat fee structures are increasingly used, particularly in lower-value matters where clients want certainty about their legal billing from the outset. Conditional fee agreements (CFAs) and damages-based agreements (DBAs) are used primarily in litigation, allowing clients to secure the services of legal counsel without paying upfront in exchange for a share of any recovery.

Each of these fee structures carries its own compliance requirements. And it is compliance, not simply having a signed document, that determines whether a retainer will hold up when it matters.

Why Compliance Matters More Than Solicitors Often Realise

There is a common assumption among law firms that as long as a client has agreed to the retainer and work has been carried out, recovery is simply a matter of sending a bill and, if necessary, pursuing payment. That assumption is flawed.

Under the Solicitors Act 1974, a solicitor’s ability to recover fees, and a client’s ability to challenge them, is closely tied to whether a valid statute bill has been delivered and whether the retainer underpinning that bill is legally sound. Where a retainer does not comply with the applicable rules, a firm’s entitlement to payment can be placed in serious doubt.

This is particularly acute where conditional fee agreements are involved. CFAs must satisfy specific regulatory requirements relating to their form, content, and the information provided to the client at the point of signing. A CFA that does not meet those requirements may be unenforceable – meaning not only that the success fee cannot be recovered, but that the base costs themselves may be at risk.

It is also worth noting that legal retainer compliance affects inter parties recovery, not just solicitor-client costs. Where costs are sought from an opposing party following a successful outcome, the paying party is entitled to scrutinise the receiving party’s retainer. A defective fee agreement on the receiving side can provide grounds to challenge the recoverability of costs in detailed assessment proceedings.

Common Compliance Issues to Watch For

Retainer problems are more common than many law firms expect. Issues that arise regularly include:

Incomplete or missing information – A valid legal retainer must include sufficient detail about the fee structures that apply, including how the hourly rate or fixed fee is calculated and the basis on which additional charges may arise. Retainers that omit key information about the cost of legal services can fall short of the required standard.

Failure to explain assessment rights – Clients must in most circumstances be informed of their right to seek a detailed assessment of any bill they receive. Where this information is absent from the retainer or the accompanying documentation, the bill’s enforceability can be undermined.

CFA formality requirements – Conditional fee agreements must be in writing and signed by the client before work begins. A CFA that is backdated, unsigned, or entered into after the relevant work has commenced is likely to be non-compliant.

Damages-based agreement errors – DBAs carry their own technical requirements distinct from those applicable to CFA precedents; for use as DBAs without appropriate review frequently introduce compliance problems that only become apparent at the recovery stage.

Unclear terms and conditions – Vague or ambiguous language around what is included in a fixed fee, what triggers additional charges, or what happens if a matter settles early can create disputes that could easily have been avoided.

The 12-Month Point and Why Early Review Is Essential

Under the Solicitors Act 1974, a client who has not paid a bill may apply for a detailed assessment within 12 months of delivery in certain circumstances. However, specific time limits and conditions apply depending on the situation, and the right to seek assessment can be affected or lost, depending on the steps taken by both parties after the bill is delivered.

For law firms, this means that retainer issues which are not identified early can quickly become difficult to resolve. A compliance problem that might have been corrected or mitigated before a bill is raised becomes significantly harder to address once assessment proceedings are underway, or a client has raised a formal dispute.

Getting specialist advice before problems arise, ideally at the point the retainer is drafted or at the start of the billing process, is almost always more cost-effective than attempting to resolve a compliance issue after the fact.

How Greener Costs Can Help

At Greener Costs, we work with law firms across England and Wales on costs recovery at every stage of a matter. Our team of qualified costs lawyers and costs draftsmen regularly advise on legal retainer compliance, the validity of statute bills, and the steps needed to protect a firm’s position at the point of recovery.

Whether you are preparing to bill a long-running matter, dealing with a client who is disrupting your fees, or facing a challenge to your costs in detailed assessment proceedings, we can provide clear and practical advice on where you stand and what your options are.

Our services in this area include:

• Reviewing retainers and fee agreements for compliance issues
• Advising on CFA and DBA validity
• Preparing bills of costs and supporting detailed assessment proceedings
• Advising on time limits and assessment rights under the Solicitors Act 1974
• Negotiating resolution of solicitor-client costs disputes

 We provide transparent, upfront pricing on all instructions with no hidden fees.

Contact our team today on 01204263047 or email info@greenercosts.co.uk to discuss your requirements.

Frequently Asked Questions

What is a legal retainer? A legal retainer is the fee agreement between a law firm and its client. It sets out the terms and conditions of the legal representation, including how fees are structured – whether on an hourly rate. Fixed fee, or on a conditional fee basis – and how the client pays for the legal services provided.

Can a non-compliant retainer affect inter partes costs recovery? Yes. Where costs are sought from an opposing party, the paying party is entitled to scrutinise the retainer underpinning the claim. A defective or non-compliant fee agreement can give grounds to challenge the recoverability of costs in detailed assessment proceedings, not just in disputes between the solicitor and their own client.

What are the most common legal retainer compliance problems? Common issues include failure to explain client assessment rights, conditional fee agreements that were not signed before work commenced, ambiguous terms and conditions around fixed fee scope, and damages-based agreements drafted without proper attention to their specific regulatory requirements.

How long does a client have to challenge a solicitor’s bill? Time limits depend on the specific circumstances. In many cases, a client who has not paid may apply for a detailed assessment within 12 months of the bill being delivered. However, the position can vary, and specialist advice should be sought as early as possible to avoid missing relevant deadlines.