Conversion optimisation cost: what CRO costs and when to invest in it

Conversion rate optimisation (CRO) is a way to get more sales out of the traffic you already have. A 10 % lift in conversion is like adding 10 % to the effectiveness of your advertising, without spending any more on ads.

What makes up the cost of CRO?

• Analysis — user behaviour, funnel analysis, competitor comparison
• Hypotheses: what gets tested and why
• Setting up A/B tests: the technical build
• User testing — 5–10 people testing the site
• Reporting and the next iteration

Realistic price ranges

• A one-off CRO audit: €1,500–5,000
• Light continuous CRO: €1,000–2,000/month (1–2 tests a month)
• Active CRO work — €2,000–4,000/month (2–4 tests a month)
• Enterprise CRO: €4,000+/month (a continuous team)

When is it worth starting CRO?

Once you have at least 10,000 visitors a month and 100 conversions a month. Below that, A/B tests do not accumulate statistical significance.

Before CRO it is worth making sure the fundamentals are in place: Core Web Vitals sound, conversion paths clear, GA4 installed correctly.

Frequently asked questions

What is a realistic result from CRO?

A 10–30 % lift in conversion over six months is a realistic target. More than that is rare.

Are A/B tests compulsory?

On a large site, yes. On a small one (under 100 conversions a month) it is better to look at heatmaps and user tests.

What is a good conversion rate?

In ecommerce 1–4 %, on service sites 2–10 %. It varies a great deal by industry.

Worth a look too

Read these related articles and service pages too:

• Conversion optimisation guide
• Business website cost
• Website service

External sources:

• web.dev – Core Web Vitals

Let us find the solution that fits your need

Book a free 30-minute assessment. We go through your goals, a realistic budget and the options. No sales pitch.