The verdict in three sentences
For an online retailer with 4,500 products, 180 categories and two storefronts (Dutch and English), ecommerce SEO agency fees in Rotterdam sit in a 2026 market ballpark of €1,500 to €6,500 a month, ex VAT. At this scale, a good agency is judged on category content, product feed hygiene and the link between the two language versions, far more than on content volume. Score every candidate on a 100-point scorecard and require tracking of revenue attributed to organic search, or you will pay for rankings that do not sell.
What an ecommerce SEO agency costs in 2026
A Rotterdam retailer of outdoor and garden products sells across the Netherlands and Flanders in Dutch, and to the wider EU in English. Two languages double the number of URLs and the room for mistakes: wrong hreflang, untranslated filters, English pages competing with Dutch ones. The figures below are market ballparks to set against a precise scope.
| Provider type | Monthly fees (EUR, ex VAT) | Usually included | Fits when |
|---|---|---|---|
| Senior freelance SEO | 1,500 to 3,000 | Audit, priorities, tracking, little production | Strong in-house team to execute |
| Generalist SEO agency | 2,000 to 4,000 | Audit, content, links, reports | Simple catalogue, one language |
| Specialist ecommerce SEO agency | 3,500 to 6,500 | Templates, categories, feeds, revenue tracking | Large catalogue, two storefronts |
| Web agency with SEO bundled | 1,500 to 3,500 | Technical fixes with development included | Custom platform that needs changes |
| Fixed-plan SEO subscription | Public price per plan | Standardised production and reporting | Predictable budget, steady cadence |
The initial audit is often billed separately at €3,000 to €12,000 depending on depth (2026 estimate). Be wary of free audits: they are designed to sell a retainer, not to tell you what matters.
The 100-point scorecard
Complete it after each pitch with your ecommerce lead and whoever maintains the platform. Anything under 65 points should not go further.
| Criterion | Points | What to check |
|---|---|---|
| Category method across 180 categories | 20 | Useful copy, indexable versus blocked filters, internal links |
| Dutch and English storefronts | 15 | Hreflang, translated slugs, no duplicate English pages |
| Product feed and template quality | 15 | Titles, structured data, feed consistency with Google Merchant Center |
| Out-of-stock handling | 10 | Page kept with alternatives, 301 when discontinued |
| Revenue attributed to organic | 15 | Non-brand organic revenue by category in Google Analytics 4 |
| Ability to get fixes shipped | 10 | Clear tickets for developers or development included |
| Comparable ecommerce references | 10 | Catalogue above 2,000 products, reachable contact |
| Quote transparency | 5 | Days per month, deliverables, notice period |
| Total | 100 |
Red flags in pitches
| Red flag | What it may hide | Question to ask |
|---|---|---|
| Guaranteed number one rankings | Dubious tactics or no-volume keywords | Which queries, and what search volume? |
| Reports built on rankings only | No link to sales | How do you measure organic revenue? |
| Content volume as the main pitch | Output without priorities | Which 20 categories come first, and why? |
| No question about the English store | Hreflang left to chance | How do you stop the two versions competing? |
| 24-month lock-in | Agency protecting itself | What exit clause after 6 months? |
| Bulk link buying | Risk of a Google penalty | Where do the links come from and what do they cost? |
If you would rather have a fixed monthly plan with a weekly report than an open-ended retainer, Kolonell's Traffic Engine runs on 12-month plans and should be scored on the same grid as any other candidate.
Mini case study
Illustrative example, not a real client: Sanne, ecommerce director of a Rotterdam garden retailer, sells €3.5 million a year online, 28% from non-brand organic search, or €980,000. She hires a specialist agency at €4,500 a month, €54,000 a year.
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At a 38% gross margin, the agency must generate at least 54,000 / 0.38 = €142,100 of extra organic revenue to pay for itself, a 14.5% lift on the channel. The agreed plan covers rewriting the 50 Dutch categories that carry 65% of organic sessions, fixing hreflang between the two stores and cleaning 600 discontinued product URLs. Sanne sets a six-month checkpoint on organic revenue, not rankings.
FAQ
What does an ecommerce SEO agency cost in Rotterdam?
In 2026 terms, roughly €1,500 to €6,500 a month, plus an initial audit of €3,000 to €12,000. The top of the range covers agencies that handle templates, categories and revenue tracking across both languages.
When do results show?
Technical fixes often show an effect in 2 to 4 months. Gains on competitive categories usually take 6 to 12 months.
Do we need to rewrite all 4,500 product pages?
Rarely. Improve the templates, then rewrite the 150 to 300 products that drive most revenue, followed by categories.
Does an English store hurt the Dutch one?
Not if hreflang and canonicals are set correctly. Errors here can leave 10% to 30% of pages ranking in the wrong country, so audit them first.
How do we measure SEO revenue?
In Google Analytics 4, isolate organic search and exclude brand queries using Search Console data. Track it monthly by category and compare with agency fees.
Get found by the customers looking for you. Start with a visibility audit at 100,000 FCFA (about 152 EUR, credited against setup if you start within 30 days), then a Traffic Engine plan fitted to your catalogue with a weekly report on enquiries and sales: Traffic Engine. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
