The verdict in three sentences
A reliable ERP/CRM integration connector costs between 15,000 and 35,000 EUR in 2026 depending on the number of data flows and mapping complexity. Expect 6 to 12 weeks from scoping to supervised go-live. The return on investment comes from eliminating double entry: roughly 30 hours per month saved for an average industrial SME.
The line-by-line cost breakdown
Every integration project breaks down into four major cost items. Flow scoping precisely defines which data moves, in which direction and at what frequency. The API connector is the bulk of the development and is priced per connected system. Mapping transforms data from one model to another. Finally, monitoring and error recovery ensure nothing is silently lost.
| Item | 2026 range (EUR) | Timeline |
|---|---|---|
| Flow scoping and specifications | 3,000 | 1-2 weeks |
| API connector (per connected system) | 4,000 - 10,000 | 2-4 weeks |
| Data mapping and transformation | 3,000 | 1-2 weeks |
| Monitoring and error recovery | 2,500 | 1 week |
| Testing and go-live | 2,500 | 1-2 weeks |
| Total (2 to 3 flows) | 15,000 - 35,000 | 6-12 weeks |
Cost rises with the number of systems: linking only the website to the ERP stays under 18,000 EUR, but adding the CRM, a billing tool and a WMS quickly pushes toward the top of the range.
iPaaS or custom connector?
The real economic decision is between an integration platform (iPaaS such as Make, Zapier or Workato) and a custom-built connector. iPaaS starts fast and is cheap to enter, but the monthly subscription climbs with task volume. Custom costs more to build but has no volume toll.
| Criterion | iPaaS (subscription) | Custom connector |
|---|---|---|
| Setup cost | 2,000 - 8,000 EUR | 15,000 - 35,000 EUR |
| Annual recurring cost | 3,000 - 15,000 EUR | 1,500 - 4,000 EUR (maintenance) |
| Transaction volume | Billed per task | Unlimited |
| Complex business logic | Limited | Full |
| Vendor lock-in | High | Low |
| Break-even point | < 20,000 tasks/month | > 20,000 tasks/month |
Simple rule: below 20,000 operations per month with standard flows, iPaaS wins. Beyond that, or with specific business rules, the custom connector becomes more profitable from year two.
Mini case study
Claire is CFO of a 60-person industrial SME in Toulouse. Her sales reps enter orders in the CRM, then an assistant re-enters them in the ERP: about 30 hours per month at 28 EUR loaded cost, meaning 840 EUR monthly lost, plus copying errors. She invests 22,000 EUR in a bidirectional CRM-ERP connector. Direct savings reach 10,080 EUR per year, on top of fewer billing disputes. The connector pays for itself in about 26 months, before even counting restored stock accuracy.
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FAQ
How long does an ERP/CRM integration project take?
Expect 6 to 12 weeks depending on the number of flows. A simple single-flow connector can ship in 4 weeks; a bidirectional sync with multiple entities needs more testing and load validation.
Do we have to modify the existing ERP?
Rarely in depth. We rely on the vendor's APIs or web services. If the ERP is old and API-less, budget an extra 3,000 to 6,000 EUR for a bridge via database or files.
What happens if a flow fails overnight?
That is the job of the monitoring and error recovery item: failed transactions are queued, alerted by email or Slack, and replayable without loss. Without it, a silent failure can desync stock and invoices for days.
iPaaS or custom to start fast?
For a first flow and to validate the need, iPaaS is unbeatable on timeline. If you exceed 20,000 monthly tasks or have fine business logic, switch to custom: the iPaaS subscription eventually costs more than maintenance.
Can the connector handle multiple companies or subsidiaries?
Yes, but each entity adds mapping and rules. Budget around 3,000 EUR per additional company for setup and dedicated testing.
Let's scope your project. Tell us your systems (ERP, CRM, third-party tools), the number of flows you need and your monthly volume: we scope the perimeter and settle iPaaS versus custom. Detailed quote within 48 h. 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.
