The verdict in three sentences
A custom ERP-CRM integration costs between EUR 8,000 and 25,000 in London in 2026, depending on the number of synced entities and the mapping complexity. An iPaaS (Make, n8n) starts at EUR 3,000 setup but hits limits as soon as business logic gets specific. The real win is not the connector price: it is removing 10 to 20 hours a week of re-keying and the errors that pollute your sales pipeline.
What an ERP-CRM connector costs in 2026
Price depends on the number of synced objects (customers, products, orders, invoices), sync direction and mapping granularity. Below are 2026 order-of-magnitude figures for the London market.
| Scope | Synced objects | Direction | Indicative price |
|---|---|---|---|
| Simple connector | Customers + contacts | One-way | EUR 8,000 - 12,000 |
| Standard connector | + Products + orders | Bidirectional | EUR 12,000 - 18,000 |
| Advanced connector | + Invoices + stock + discounts | Bidirectional near real-time | EUR 18,000 - 25,000 |
| Full flow rebuild | Everything + business rules | Event-driven | EUR 25,000 - 40,000 |
On top of these, budget for technical documentation, client acceptance testing and a history migration phase (often EUR 1,500 to 4,000).
iPaaS or custom development
Many SMEs hesitate between a no-code tool (Make, Zapier, n8n) and a built connector. The table compares both approaches on a 5,000 orders/month flow.
| Criterion | iPaaS (Make/n8n) | Custom development |
|---|---|---|
| Setup | EUR 3,000 - 7,000 | EUR 12,000 - 20,000 |
| Monthly cost | EUR 80 - 400 (operation quota) | EUR 0 (excl. hosting) |
| Complex business logic | Limited | Unlimited |
| Error handling | Basic | Retry + alerts + log |
| Vendor lock-in | High | None (code delivered) |
| 24-month cost (5,000 ord/mo) | EUR 8,000 - 16,000 | EUR 12,000 - 20,000 |
Below 1,000 operations/month, iPaaS wins. Above that, or as soon as mapping needs conditional rules, custom becomes cheaper over 24 months.
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Mini case study
Claire, CFO of an industrial trading SME in Croydon (38 staff). Her teams re-keyed every order from the ERP (Sage) into the CRM (HubSpot): about 14 hours/week combined, at a loaded cost of EUR 32/h, i.e. EUR 448/week or ~EUR 19,400/year. Kolonell delivered a bidirectional connector at EUR 16,500, first-year maintenance included. Net payback by month 11. Bonus: billing error rate fell from 4.2% to 0.6%.
FAQ
How long to deliver an ERP-CRM connector? Expect 4 to 8 weeks for a standard connector: 1 week scoping and mapping, 3 to 5 weeks development, 1 to 2 weeks acceptance. A full event-driven flow rises to 10-12 weeks.
What annual maintenance budget should I plan? Typically 15 to 20% of the build cost per year, i.e. EUR 2,500 to 5,000, to absorb vendor API changes (Sage, Cegid, Salesforce alter endpoints 1 to 2 times/year).
What happens if the ERP API goes down? A serious connector uses a retry queue with idempotency: messages replay without duplicates once service is restored. This guarantees no order is lost even after 6 hours of downtime.
Can I sync in real time? Yes via webhooks, with 2 to 10 seconds latency. Batch mode (every 15 min) stays 30 to 40% cheaper and covers most SMEs.
Do I need a dedicated person on my side? No. A supervision dashboard and email alerts are enough; 1 to 2 hours/month of monitoring by a key user covers it.
Let's scope your project. Tell us your two tools (ERP + CRM), monthly order volume and indicative budget (EUR 8,000-25,000): we frame the mapping and sync direction. 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.
