Which Metrics Really Matter: a Pirical Analysis

5 min read Published September 2026

The next generation of law firm leaders face difficult decisions with no precedent to fall back on. Grow revenues when clients are pushing back on prices, and cut costs during an escalating salary war. In the meantime, AI continues to change what clients think a lawyer's hour is worth. Reporting tells you how well you did, and benchmarking tells you where you stand. Neither tells you where your opportunities are.

Polaris is the solution that gives law firm leadership the knowledge of their firm's performance across each practice, and the modelled profit opportunity within each metric.

To illustrate what this might be worth, we have modelled data for ' Practice X ', a synthetic practice group of approximately 49 qualified lawyers, 13 equity partners, and £27m annual revenue. Using pooled data from law firms across a basket of key operational metrics, we've uncovered how the market varies and what a jump from the bottom quartile ('among the worst') to the top quartile ('among the best') of performance in each metric would actually be worth, in pounds, to Practice X. Practice X sucks: they are bottom quartile of the market for everything. The question is, what should they work on first?

Our analysis shows why picking your battles is wildly important.

Investing to become market-leading in the least impactful area is worth £0.5m additional annual profit. But the same effect in the most impactful one would be worth £23.6m, 47 times more.

The Metrics Wasting Your Time

The metrics below are worth under £5m a year to Practice X.

Horizontal bar chart of annual profit opportunity for the eight metrics worth under £5m a year, running from direct cost per lawyer at £4.6m down to client revenue diversification at £0.5m

Below, we outline why these metrics might not be the battles most worth fighting for Practice X.

The Gaps Firms Can See are Often the Ones Worth Least

Some of our metrics have a very wide market spread, with comparatively little reward. This makes them easy distractions to the uncritical eye.

Firms are more spread out on associate headcount growth than on any other metric we measured, yet it presents one of our smallest profit opportunities. Cross-sales revenue growth (revenue growth from selling additional practices into existing clients) and annual rates rises (how fast the firm puts its rates up each year) are also very spread across the market, and both sit near the bottom for profit.

All three are visible in the market, which makes them straightforward to build a case around internally. A firm can look at a genuine gap between itself and its peers, fund the work to close it, but ultimately find a low return in the end. For Practice X , these are not the metrics that matter most.

Junior Retention, Back Office and Client Mix All Sit at the Bottom

Improving non-partner fee earner retention to top-of-market levels is worth just £0.7m to Practice X. Leaders championing investment in this area may find little bang-for-buck.

Business services leanness (the number of business services professionals compared to fee earners) is worth £0.6m and client revenue diversification (how concentrated revenue is in the largest clients) £0.5m. Neither the back office nor the shape of a firm's client base carries much profit opportunity either way to Practice X , and none of these three metrics are where a typical practice's time is best spent.

Cost Per Lawyer is in the Middle

The annual cost of employing each non-partner lawyer (including salaries and bonuses) medians at about £98,000. Around £31,000 per non-partner lawyer separates the bottom quartile from the top, and at £4.6m it sits just about in the middle for profit opportunity.

The Metrics That Really Matter

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Horizontal bar chart ranking all sixteen metrics by annual profit opportunity, from billed rate per hour at £23.6m down to client revenue diversification at £0.5m

Billed Rate is the Largest Opportunity by a Wide Margin

Around £94 an hour separates the bottom quartile from the top, and closing that gap is worth £23.6m a year to Practice X. With a fairly wide market spread, this metric isn't a quiet edge but rather an open goal.

Where the Hours Sit is Worth £10.9m

Leverage here means the share of hours actually worked by non-partner fee earners.

The bottom quartile runs at around 76% and the top at around 84%, a gap of eight percentage points. Firms are bunched on it, and it is the fourth largest profit opportunity of these metrics, which is the widest mismatch between visibility and value.

The difference between firms in leverage is difficult to see, but closing the gap here yields high reward for Practice X.

Collecting What You Agreed is Worth More than Agreeing More

Postwork realisation refers to the revenue a firm writes off as the work is being done. It is worth £6.8m in our analysis, and firms are very tightly bunched on it.

So the market competes visibly on raising prices and barely at all on collecting them, while improving on collecting is worth more than double to Practice X.

Simply Standing Still Might Win You the Matters per Lawyer Game

Completed matters per lawyer is one of the metrics we're watching closely to see whether AI is helping firms realise more productive economics.

An interesting finding is that matters completed per head are actually falling by five to seven per cent a year in many practices. And even firms in the top quartile are barely holding flat.

In this context, the value of holding a steady pace while the rest of the market declines is particularly large. If Practice X can keep its output the same, it will enjoy market-leading performance on this measure.

To Practice X , this investment would be worth £13.5m, second only to billed rate.

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Read the metrics that really matter

Unlock the full picture, including metrics worth more than £5 million to Practice X.

What this means for your firm

Where would your firm's biggest opportunity sit?

These figures describe the market. Which move any particular firm should make first depends on its own numbers, and on the peers it would genuinely compare itself against. Polaris models that, practice by practice.

Learn more

An annual presentation for firm leadership, with the peer group chosen by the firm.

What this means for your firm

Which of these moves should your firm make first?

The figures above are market-wide. They do not tell you which move any particular firm should prioritise, because that depends on the firm's own numbers and on the peers it would genuinely compare itself against. That's what Polaris is built for.

Learn more

Polaris uses benchmarking data across these metrics and more, with the peer group chosen by the firm.

Methodology

Timeframe: Five financial years, 1 May 2021 to 30 April 2026.

Scope: UK offices, measured at practice-area level. Each firm contributes one value per metric, averaged across the years it has data for. A metric has at least six firms behind it, and a firm has at least four of the five years.

Caveats: Extra revenue is valued at the 70% contribution margin and cost removed at the full amount. Figures carry around 12% of uncertainty either way. They are not additive, because several metrics price the same revenue from different directions, and they are not a projection for any individual firm.