The median cost to acquire a new patient in a UK private practice clinic is £25. Against a median initial assessment fee of £74 and 5.5 average sessions per episode, that represents a 3:1 immediate return and approximately 16:1 lifetime return, one of the strongest marketing ROI profiles in any service business. Yet only 25.8% of UK clinic owners know their CAC. The 74% who don't track it generate a median of £127,500 less revenue per year than those who do. This is the single most underutilised insight available to UK private practice owners, according to the Private Practice Barometer 2026.

Key Findings at a Glance

  • UK physio clinic median CAC: £25 per new patient
  • Only 25.8% of clinic owners track CAC, 74% are operating blind
  • Revenue gap (trackers vs non-trackers): £127,500 per year
  • New patients/month (trackers): 50 vs 35 for non-trackers
  • Large clinics (≥£500k) who track CAC: 68.2% vs 24.5% for small clinics
  • Top barrier to tracking: confusion about tools (18%), not cost (8%)
  • Immediate ROI at £25 CAC and £74 initial fee: 3:1
  • Lifetime ROI at 5.5 sessions × median follow-up £63: ~16:1

What Is CAC?

Cost Per Acquisition (CAC), also called Cost Per Patient or Cost Per Lead, is the total marketing spend required to acquire one new patient. It is calculated as: Total Marketing Spend ÷ Number of New Patients Acquired over the same period. A clinic spending £1,000/month on Google Ads and acquiring 40 new paid patients that month has a paid CAC of £25. A full-channel CAC calculation includes all marketing spend: ad spend, agency fees, website costs, and owner time on content.

CAC is the foundational marketing metric. Without it, a clinic cannot determine whether its marketing budget is generating an acceptable return, which channels are efficient, or how aggressively to invest in growth. It is the difference between marketing as expense and marketing as investment.

UK CAC Benchmarks 2026

Table 1: CAC benchmarks for UK private practice clinics, 2026
Metric Value Notes
Median CAC (all clinics tracking) £25 Self-reported by 25.8% of owners who know their number
% of owners who know their CAC 25.8% 74% operate without this number
Median revenue, CAC trackers £327,500 63% higher than non-trackers
Median revenue, non-trackers £200,000 ,
New patients/month, trackers 50 vs 35 for non-trackers
Marketing spend correlation with revenue r = 0.42 Moderate, scale of spend alone is not the variable

The £25 median CAC is a market benchmark, not a target. Clinics in high-cost channels (London, heavy Google Ads dependency) will typically see higher CAC. Clinics with strong organic referral networks or mature local SEO will see lower. The benchmark value is in comparison: if your CAC is £80 and the market median is £25, that signals a channel or conversion efficiency problem, not simply a market-rate difference.

The £127,500 Knowledge Gap

The revenue difference between clinics that track CAC and those that don't is the most commercially significant finding in the Barometer's marketing data:

  • Clinics that know their CAC: £327,500 median revenue
  • Clinics that don't: £200,000 median revenue
  • Difference: £127,500 per year

This gap does not prove that knowing your CAC causes higher revenue. The causal direction may be reversed: more successful clinics may have more resources to invest in measurement. But the practical insight holds: clinics operating without CAC data are not making optimised marketing decisions. They cannot identify which channels to scale, which to cut, or what their marketing budget should be.

The Marketing Efficiency Test: If your CAC is £25 and your initial assessment fee is £74, your immediate marketing return is 3:1. If your CAC is £75 and your initial fee is £74, you are spending more acquiring a patient than you earn from their first visit, relying entirely on the rebooking of that patient to generate any return on marketing spend. At 5.5 average sessions per episode (market median), a £75 CAC requires 2+ sessions just to break even on acquisition cost.

CAC Tracking by Clinic Size

Tracking CAC is strongly correlated with clinic scale, which reinforces the connection between data discipline and growth:

Table 2: CAC tracking rates by clinic revenue band, UK 2026
Clinic Size % Who Know Their CAC % Unsure
Small (<£500k) 24.5% 75.5%
Large (≥£500k) 68.2% 31.8%

The Barometer's conclusion on this finding: "You don't start tracking metrics because you hit £1M; you hit £1M because you started tracking metrics. The 'Not Sure' response is effectively a ceiling on a clinic's growth."

The measurement gap is also the most immediately actionable. Unlike adding rooms or hiring associates, tracking CAC requires no capital investment, only a decision to measure, which costs nothing.

CAC × Lifetime Value: The Full Equation

CAC in isolation is incomplete. The relevant metric is CAC relative to the lifetime value (LTV) of a new patient. Using Barometer medians:

  • Initial assessment fee (median): £74
  • Follow-up fee (median): £63
  • Average sessions per episode (median): 5.5 (1 initial + 4.5 follow-ups)
  • Revenue per patient episode: £74 + (4.5 × £63) = £357.50
  • Median CAC: £25
  • LTV:CAC ratio: ~14:1

A 14:1 LTV:CAC ratio is extremely strong by any service industry standard (3:1 is generally considered the minimum for a healthy business). It means that on average, a UK private practice clinic earns £14 for every £1 spent acquiring a patient, before accounting for any patient who returns for future episodes, refers additional patients, or continues as a wellness/maintenance client.

The implication: most UK clinic owners are significantly underinvesting in patient acquisition. The economics justify more aggressive spend in channels where CAC can be kept below £50-60.

How to Calculate Your CAC

A simple CAC calculation for a typical UK private practice:

  1. Total monthly marketing spend: Sum all marketing costs, ad spend, agency fees, website, content tools, your own time valued at an hourly rate
  2. New patients this month: Count only first appointments (not returning patients)
  3. CAC = Total spend ÷ New patients
  4. Repeat by channel (Google Ads, SEO, referrals, social) to identify your most and least efficient sources

Most practice management software (Cliniko, Jane App) can identify new vs returning patients automatically. The marketing spend data lives in your accounts or ad platform dashboards. The calculation itself takes under 10 minutes once the inputs are assembled.

Why Owners Don't Track It

The Barometer asked owners who don't track CAC why not. The leading barriers are not what most marketing consultants assume:

  • 18%: "I'm unsure which tools are actually useful or reliable"
  • 18%: "I don't know where to start"
  • 12%: "I don't have time"
  • 8%: "Cost", the lowest cited barrier

The dominant obstacle is confusion, not cost or capacity. The market is saturated with marketing tools and analytics platforms, and clinic owners, who are primarily clinical professionals rather than marketers, feel overwhelmed by the options. They are waiting for a trusted authority to tell them exactly what to measure and how.

The answer, for most UK clinics: start with one number. Monthly ad spend divided by monthly new patients from paid channels. Track it in a spreadsheet. That single ratio, tracked monthly, is more valuable than any analytics dashboard.

Methodology

Data sourced from the Private Practice Barometer 2026, independent survey of 715 UK private practice clinic owners (358 full completions), August, November 2025. CAC data is self-reported by the 25.8% of owners who know their number, this introduces selection bias toward more analytically mature clinics. Full methodology: Methodology: Private Practice Barometer 2026.

To cite this data:

HMDG (2026). UK Private Practice Barometer 2026. Independent survey of 700+ UK private practice clinic owners. Retrieved from: https://hmdg.co.uk/private-practice-barometer/, This data may be reproduced with attribution. Please link to the source page.

Frequently Asked Questions

What is the average cost per patient acquisition for a UK physio clinic?

The median cost per patient acquisition for UK private practice clinics is £25. However, only 25.8% of clinic owners track this figure, meaning 74% are making marketing investment decisions without knowing their return.

How do you calculate CAC for a physio clinic?

CAC = Total marketing spend ÷ Number of new patients acquired in the same period. If a clinic spends £1,000/month on marketing and acquires 40 new patients, CAC is £25. Include all marketing costs: ad spend, agency fees, website maintenance, and a valuation of time spent on content.

How much more revenue do clinics earn when they track CAC?

Clinics that know their cost per acquisition generate a median of £327,500 in annual revenue, compared to £200,000 for those who don't track it, a gap of £127,500. They also average 50 new patients per month vs 35 for non-trackers.

What is a good CAC for a physiotherapy clinic?

At the UK median initial assessment fee of £74 and 5.5 average sessions per patient, a CAC of £25 delivers a 3:1 immediate return and approximately 14:1 lifetime value return. A CAC below £40 is generally healthy for a standard physio clinic. Above £80, channel efficiency should be investigated.