CRO Agency Pricing UK: What Conversion Optimisation Costs in 2026

CRO agency pricing in the UK runs from £2,000 to £10,000 or more per month, and the number that matters is not the fee but the uplift the fee has to buy. Conversion rate optimisation (CRO) is the practice of raising the share of visitors who complete a valuable action, using research and controlled experiments rather than opinion. SugarNova publishes its bands below, with the break-even arithmetic for each, so a founder can test any quote against their own revenue before a sales call.

Key takeaways

• A UK CRO agency typically costs £2,000 to £10,000 or more per month, and SugarNova prices in three bands: entry at £2,000 to £4,000, core at £4,000 to £7,000 and programme at £7,000 to £10,000+.
• A CRO retainer pays back when the percentage uplift in monthly contribution exceeds the monthly fee divided by monthly contribution, which SugarNova calls the Break-Even Uplift Test.
• On a 35% contribution margin, a £5,500 monthly retainer needs a 15.7% conversion uplift at £100,000 monthly revenue but only a 3.1% uplift at £500,000.
• CRO returns arrive in two stages, with early wins in 4 to 6 weeks and statistically reliable uplift in 3 to 6 months, so a fair test needs a budget for at least six months.
• Sustained conversion gains are valued at a multiple of profit at exit, which is why SugarNova treats a CRO fee as an enterprise value investment under Exit-Led Growth.

How much does a CRO agency cost in the UK?

A CRO agency in the UK typically costs £2,000 to £10,000 or more per month on a retainer. SugarNova prices conversion rate optimisation in three bands, set by how much traffic a brand has, how many funnels need work and how many tests can run at once.

Source: SugarNova published CRO pricing bands, October 2026. The full service scope sits on the SugarNova CRO agency page.

What decides which price band a brand lands in?

Traffic volume decides the band more than any other factor, because a test needs enough visitors to reach a reliable result in a sensible time. Funnel count, testing velocity and integration with paid and SEO move a brand up the bands from there.

• Traffic: low-traffic sites run fewer, longer tests, so the entry band fits a single funnel with 1 to 2 concurrent tests.
• Funnels and markets: each extra funnel or market adds research and test design, which is why the core band covers multiple funnels with a full research cycle.
• Testing velocity: more concurrent tests need more design, build and analysis hours each month.
• Integration: the programme band ties CRO to paid media and SEO so that conversion gains and traffic spend are managed as one system.

SugarNova runs every engagement in five fixed stages, starting with a quantitative audit in week one, so the band is confirmed against real traffic data rather than guessed from a form. Each testing cycle runs 4 to 6 weeks, which sets the minimum rhythm of work behind a monthly fee.

How do you calculate whether a CRO retainer will pay back?

A CRO retainer pays back when the percentage uplift in monthly contribution is larger than the monthly fee divided by monthly contribution. SugarNova calls this the Break-Even Uplift Test, and it needs three inputs: monthly revenue, contribution margin and the monthly fee.

The formula is: break-even uplift = monthly fee ÷ (monthly revenue × contribution margin). A brand with £250,000 monthly revenue and a 35% contribution margin earns £87,500 a month in contribution, so a £5,500 retainer must lift contribution by 5,500 ÷ 87,500 = 6.3% to cover itself.

Source: SugarNova calculation using band mid-points and an illustrative 35% contribution margin, October 2026. Brands with a different margin should substitute their own figure, because the break-even uplift moves in direct proportion to it.

When is a CRO retainer not worth buying yet?

A CRO retainer is usually not worth buying below roughly £100,000 in monthly revenue, because the core and programme bands then need a conversion uplift of 15.7% to 24.3% just to break even. Brands under that line get a better return from the entry band, a fixed-scope audit or fixing the offer and traffic quality first.

The table above shows the pattern. At £100,000 monthly revenue the programme band needs a 24.3% uplift, while at £500,000 the same fee needs 4.9%. SugarNova holds this position because the same fee that is a rounding error for a £500,000-a-month store is a bet on an exceptional test result for a £100,000-a-month store.

Retainer, fixed-scope project or performance-based: which CRO pricing model fits?

A monthly retainer fits most brands that want continuous testing, a fixed-scope project fits brands with an in-house team that only needs a diagnosis, and performance-based pricing fits only when the baseline is defined in writing. Each model moves risk between the brand and the agency in a different way.

How does CRO spend turn into enterprise value?

CRO spend turns into enterprise value because a sustained conversion gain adds profit, and acquirers pay a multiple on profit rather than on traffic. A conversion gain reaches profit without a matching rise in media spend, which is why it capitalises more cleanly than most growth spend.

A worked example shows the scale. A brand with £250,000 monthly revenue that sustains a 10% relative conversion uplift adds £25,000 in monthly revenue, which at a 35% contribution margin is £8,750 a month or £105,000 a year. At an illustrative 8x multiple that is £840,000 of enterprise value, against £66,000 of core-band fees over twelve months at £5,500 a month. The same logic sits behind CRO and Exit-Led Growth, and the category itself is defined in what Exit-Led Growth is.

What should a CRO proposal state before you sign?

A CRO proposal should state the baseline conversion rate, the test cadence, the term and who owns the test data before any fee is agreed. A proposal missing any of the four cannot be measured against the Break-Even Uplift Test.

• Baseline: the current conversion rate, session count and average order value, for example 2.0% on 62,500 sessions at an £80 order value.
• Cadence: the number of tests per month and the length of each cycle, with 4 to 6 weeks as the working range.
• Term: a minimum of six months, because reliable uplift takes 3 to 6 months to confirm.
• Ownership: test designs, data and learnings that stay with the brand if the contract ends.

Buyers comparing agencies side by side can use the shortlisting method in best CRO agency UK, and London-based brands can read the local view in CRO agency London. Platform-specific scopes sit in Shopify CRO agency and ecommerce CRO agency.

How do you find out which CRO price band fits your store?

The fastest way to find the right CRO band is a 20-minute diagnostic against your real traffic, funnel and margin data. SugarNova runs this as the Free Growth Audit, and the findings are delivered live on the call rather than in a sales deck.

Book the Free Growth Audit at book.sugarnova.com/audit. The audit confirms the band, the break-even uplift for your revenue and the first funnel to test.

Written by Shayne Williams, Founder and Group CEO, SugarNova Group

Shayne Williams founded SugarNova Group in London in 2016 and has built it into an integrated growth group spanning digital PR, SEO, generative engine optimisation, paid media and CRO. Shayne writes the Operator's Playbook newsletter and hosts the Build. Scale. Sell. podcast, both aimed at founders building towards a high-multiple exit.

Last substantively updated 2 October 2026. Fee bands are SugarNova's published CRO bands as at that date, and the break-even and enterprise value figures are illustrative calculations using a 35% contribution margin and an 8x multiple, not client results.