A twelve-person professional services firm with decent utilisation and a full pipeline often has a net margin stuck well below where it should be. The owner knows something is leaking, but can’t pin it down from the P&L. Revenue looks fine, the team is busy, and invoices are going out, but the bank account at the end of the quarter tells a different story.
That gap between a firm that looks profitable and one that actually is tends to come from a small number of predictable places. Before you add more clients or hire another person, it’s worth understanding which of them applies to you.
What are the main levers for improving margin in a service firm?
For a service firm with five to fifty people, margin improvement comes down to three levers: pricing, utilisation, and overhead control. McKinsey’s research shows that a one percent price increase can lift operating profit by eight to eleven percent if volume holds, making pricing the single biggest margin lever. But the room to move on price depends on whether the other two are in good shape first.
Nicholsons Chartered Accountants frame this well: protect margins through pricing and supplier review, scrutinise every overhead line, and invest in productivity-improving tools. The sequence matters because jumping to a fee increase without understanding your cost base first risks either leaving money on the table or triggering pushback you can’t justify.
Utilisation sits at the heart of service firm profitability. Sage’s guidance for professional services firms identifies non-billable time as the first diagnostic to run before any other change. This includes internal meetings, poorly scoped free work, and administrative overhead that should have been billed or cut. You cannot know whether pricing is the problem until you can see how much time is generating no revenue at all.
The practical starting point is a margin-by-service-line view. Which services earn you the most? Which clients take the most time relative to what they pay? That clarity changes what lever you pull first.
Why do existing clients often produce more margin than new ones?
Selling more to a client you already serve costs less than winning a new one. Xero UK’s profit guidance describes growing revenue from existing customers as “far less costly” than acquisition, and Aston Shaw echo the point: reliable margin gains come from deepening existing relationships. For owner-managed firms where your time is the most expensive sales resource, that argument is particularly sharp.
Not all existing clients are worth keeping, though. Aston Shaw advise reviewing which customers are actually profitable and which consume disproportionate time relative to what they pay. A client who pays at full rate and asks for straightforward work is worth more than one who negotiates hard, pays late, and requires constant management.
Over-reliance on a single large client creates a separate risk. Aston Shaw flag this directly: focusing on your most profitable customers is sensible, but allowing one client to represent too large a share of revenue makes the business fragile. If that client cuts spend or leaves, the margin impact is immediate. Broadening your base while deepening relationships with high-value segments is the more stable posture.
Retainers, subscription models, and structured service tiers can help on both fronts. They create predictable revenue, which makes staffing and planning easier, and they often lift average revenue per client without requiring you to win more accounts.
Where is margin actually leaking in a typical service firm?
In a service business, margin leaks in three places reliably: non-billable time, scope creep, and overhead that has grown unchecked. Sage’s guidance for professional services firms makes utilisation the first diagnostic. What proportion of your team’s time is actually billable? Moving from sixty-five to seventy percent has a direct effect on profitability without changing your prices or headcount, and it costs nothing to measure.
Non-billable time includes internal meetings, admin, unbounded free advice, and rework caused by unclear project scopes. Tightening scope at the start of every engagement and building a change control process for work that expands prevents the quiet erosion that happens when a fixed-price job runs thirty percent over time.
Overhead deserves a structured annual review. Xero recommends checking for unused or duplicated software subscriptions and matching premises costs to your actual footprint. Many firms discover a gap between the software they pay for and the software they actively use. Renegotiating supplier contracts and consolidating purchasing with fewer vendors are both worth addressing before you look at price rises or headcount changes.
Business Advice identifies administrative automation, including invoice reminders, appointment scheduling, and email follow-ups, as a direct way to reduce back-office labour without reducing service quality. Off-the-shelf tools handle much of this at low cost, and the saving tends to be immediate.
When should you raise fees, and when would that be premature?
Fee increases work when your cost base is clear, your current pricing does not reflect the value you deliver, and your operations are running cleanly. Raising fees before fixing utilisation leaks or scoping problems often generates pushback that would not exist if the fundamentals were in order. The sequence matters: diagnose first, operate cleanly, then price accordingly.
LKA Chartered Accountants are direct on this: if you haven’t reviewed your fees recently, raising them is often the most straightforward profit improvement available. The McKinsey data supports it. A one percent rise with no volume loss can lift operating profit by up to eleven percent in a firm with high fixed costs. That applies particularly to service firms where staff time is the main cost and pricing has often drifted below inflation.
Nicholsons and Business Advice both recommend starting fee increases with new clients or segments where you are clearly undercharging, rather than a blanket rise across the board. Segmenting customers by profitability and price sensitivity before changing rates is less risky and more defensible.
What to avoid: discounting by default when clients push back. Many UK advisers point out that habitual discounting erodes margin faster than almost any other single habit. If a client is genuinely price-sensitive, de-scoping the work or offering a lower-intensity package is a better response than cutting the rate.
What else sits beneath margin that service owners often overlook?
Two things sit outside the main margin conversation but affect it directly: data compliance and cyber security. When you introduce tools that process client data, UK GDPR obligations follow. The ICO’s Accountability Framework requires proportionate data protection assessments before adopting new systems, and the ICO’s 2022 enforcement against Easylife, fined £1.48 million for data misuse, shows what unchecked automation can cost.
The NCSC’s Small Business Guide recommends basic cyber controls: strong passwords, multi-factor authentication, regular patching, and data backup. These are cheap relative to the cost of a breach, and the NCSC’s 2023 Annual Review noted that ransomware is the most acute cyber threat facing UK organisations, with smaller firms increasingly targeted because of weaker controls. A single incident can wipe out months of margin improvement.
The practical implication is a compliance floor in your margin playbook. Before you automate invoicing, use AI to manage client communications, or move client records to cloud tools, check that you have a lawful basis for processing, that staff access is limited to what they need, and that your vendors can be held to basic security standards.
None of this requires a specialist at the outset. The NCSC’s Cyber Essentials scheme sets a minimum security baseline that is achievable for a firm of five to fifty people without significant upfront investment.
The margin playbook for a service firm is not complicated in principle. Get clarity on where you are and are not making money, tighten the operational leaks, build the case for a fee review, and treat compliance and security as part of the overhead conversation rather than optional extras. Any of these moves on its own will make a difference. Worked through in sequence, they compound.
If you’d like to think through where to start in your business, book a conversation.
