The debate about hourly rates versus fixed fees has been running in the UK legal market for well over a decade. In that time, a consensus of sorts has emerged: clients increasingly expect fixed fees for routine work, and firms that refuse to offer them lose instructions. But the consensus conceals a messier reality. Many firms that have moved to fixed fees have done so without the underlying cost data to set them profitably, and the result is a pricing model that looks client-friendly but quietly erodes margins.

This guide cuts through the theory to examine when each model genuinely works, what it takes to make fixed fees profitable rather than just popular, and how the best UK firms are using hybrid structures to manage risk.

The Case for Hourly Billing

Hourly billing has attracted more criticism than it deserves in recent years. The criticism is largely valid for routine, predictable work — but for genuinely complex and unpredictable matters, the hourly rate remains the most commercially rational pricing model, and abandoning it without good reason is a mistake.

When hourly billing is the right model

The hourly rate works best when:

The scope is genuinely uncertain at the outset. A complex commercial dispute, a contested employment tribunal, or a multi-jurisdictional M&A transaction involves risks and workstreams that cannot be reliably estimated at instruction. Pricing these matters on a fixed fee exposes the firm to the entire cost of unexpected complexity.
The client has control over the scope. If the client’s instructions, availability, or decision-making materially affect how much work is required, the firm should not carry the price risk of those decisions. Hourly billing aligns incentives correctly.
The matter requires senior expertise throughout. High-value bespoke advisory work — complex restructuring, regulatory investigations, significant litigation — is often best priced hourly precisely because the value lies in the judgment of experienced lawyers, which is inherently variable in time.

The legitimate problem with hourly billing

The genuine problem with hourly billing is not the model itself but its perverse incentives. A fee earner whose income is measured in billable hours has no structural incentive to work efficiently. A client who receives a bill for 40 hours cannot easily verify whether 40 hours was appropriate or whether 25 would have sufficed. This information asymmetry erodes trust over time, even when the firm is behaving entirely honestly.

The SRA Transparency Rules, which came into force in 2018 and were strengthened in subsequent guidance, require firms to give clients clear and realistic cost information. Hourly billing satisfies this requirement only if rates are quoted accurately and estimates are updated promptly when they change — something many firms do poorly.

The Case for Fixed Fees

Fixed fees have become the default client expectation for most categories of consumer and SME legal work. Residential conveyancing, simple wills and probate, uncontested divorce, straightforward employment settlement agreements, small business company formations — clients expect to know the cost upfront and are choosing between firms substantially on that basis.

When fixed fees work well

Fixed fees are commercially sound when:

The work is genuinely standardised. If your firm does 200 residential conveyances a year, you have rich data on the typical time and cost. Setting a fixed fee based on that data is rational.
You control the main variables. Matters where the outcome depends primarily on the firm’s own work, rather than on third-party behaviour, are better candidates for fixed pricing.
The fee includes only a defined scope. Fixed fees that do not clearly delineate what is included are not really fixed — they are provisional quotes that become contentious at billing.

The profitability trap

The most common mistake when introducing fixed fees is setting them based on what competitors charge rather than what the work actually costs. This is understandable — market pricing data is accessible and your own cost data may be imprecise — but it is financially dangerous.

A residential conveyance quoted at £800 plus disbursements might be profitable at 3.5 hours of fee earner time. At 5 hours, it is break-even. At 7 hours — which happens when a transaction becomes complex — it is loss-making. If your fixed fee was set by looking at competitor websites rather than your own time recording data, you do not know which scenario applies most often.

Legal Business research published in 2024 found that firms with fixed-fee practices that also had robust matter-level time recording were 40% more likely to report those practices as profitable than firms that had introduced fixed fees without improving their time data. The data is not optional — it is the foundation.

Hybrid Pricing Structures: Managing the Middle Ground

For most firms and most practice areas, the choice is not binary. Hybrid structures that combine elements of both models are often the most commercially intelligent approach.

Capped fees

A capped fee sets a maximum cost for a defined scope of work, with the firm billing on an hourly basis up to that cap. The client gets cost certainty — they know their maximum exposure. The firm retains efficiency incentives — if the matter is resolved quickly, the client pays less. And the firm does not carry unlimited scope risk.

Capped fees work well for matters where the lower bound is predictable but the upper bound is not: a commercial lease negotiation, a straightforward employment dispute, a first-instance regulatory matter. The cap must be set at a level that allows the firm to price the full scope of work that might materialise — a cap that is too low just becomes a fixed fee with a liability disclaimer attached.

Phased billing

For complex matters, billing in phases — each with its own estimate or fixed fee — provides cost transparency without requiring the firm to estimate the full matter cost at the outset. The client approves each phase before it commences. This structure is particularly well-suited to litigation, where the cost of each procedural stage can be estimated with reasonable accuracy even if the overall case trajectory cannot.

The SRA Codes of Conduct explicitly require solicitors to update costs estimates when they change, and a phased structure is the most practical way to fulfil this obligation in complex matters.

Subscription models

A small but growing number of UK firms — particularly those serving owner-managed businesses — offer monthly subscription arrangements that cover a defined range of advisory services. These models trade revenue predictability for scope management discipline. They work well for general commercial advisory, employment law retained services, and compliance advice where the volume of queries is relatively consistent month to month.

The pricing challenge is avoiding adverse selection — attracting clients who expect heavy usage at a price point set for light usage. Robust scope definitions and usage monitoring are essential.

Making the Decision for Your Firm

There is no universal answer to the billable hours versus fixed fees question. The right approach depends on your practice area mix, your cost data quality, and your client base.

Start with cost data

Before changing your pricing model, improve your cost data. This means accurate time recording for all matter types, including fixed-fee matters, and a clear cost-per-hour figure for each fee earner that includes salary, employer NI, and a proportionate share of overhead. Without this, any fixed fee you set is a guess.

Segment your work

Map your practice areas against the criteria above. Which categories are standardised enough to price confidently on a fixed basis? Which involve genuine uncertainty that warrants hourly billing or a capped structure? Segmenting deliberately, rather than treating all work the same way, gives you better economics and a clearer client proposition.

Review regularly

Fixed fees set in 2022 are unlikely to reflect 2025 costs. Inflation, salary increases, and changes in the volume or complexity of work all affect the cost of delivery. Build a regular review — at minimum annual — into your pricing governance.

Invest in efficiency

Fixed fees and AI automation are natural partners. If the cost of delivering a standard piece of work can be reduced through better processes, document automation, and AI assistance, the margin on a fixed fee improves without any change to the price. Firms that are moving to fixed fees without simultaneously improving their delivery efficiency are accepting lower margins. Those that improve efficiency first are creating a structural cost advantage.

Whichever pricing model your firm adopts, accurate time data is essential — both to set fixed fees correctly and to monitor whether hourly matters are progressing within estimate. Obiter captures billable time automatically as work happens, giving fee earners and managers real-time visibility into matter economics without the administrative overhead of manual time recording. That data foundation makes pricing decisions better and billing conversations with clients more straightforward.

Billable Hours vs Fixed Fees: Which Works Best for UK Firms?