The verdict in three sentences
A reliable ERP ↔ CRM integration costs between €12,000 and €45,000 as a project, depending on the number of flows, mapping complexity and how automated error handling is. The real challenge isn't the connector but edge-case handling: idempotency, incident recovery, duplicates and data conflicts. Done well, it removes up to 20 hours of re-keying per week and gives a unified customer-billing view in near real time.
Custom middleware or iPaaS: the right trade-off
Two families coexist. iPaaS (Make, n8n, Workato, Zapier) wires standard flows quickly at a low monthly cost. Custom middleware (a hosted Node/Python service) pays off as soon as business logic is complex, volume is high or latency is critical.
| Approach | Project cost | Monthly cost | Best for |
|---|---|---|---|
| No-code iPaaS (Make, n8n) | €4,000 – 12,000 | €20 – 200/mo | Standard flows, moderate volume |
| Enterprise iPaaS (Workato) | €15,000 – 30,000 | €300 – 500/mo | Governance, multi-system |
| Custom middleware | €18,000 – 45,000 | €40 – 150/mo hosting | Complex logic, high volume |
| Vendor-native connector | €12,000 – 25,000 | per licence | Known Sage/Salesforce pairs |
iPaaS monthly cost climbs fast with billed operations: syncing 50,000 rows/month can exceed €400/month, bringing custom middleware close to break-even over 24 months.
What really drives the price
The budget depends less on logos than on technical detail. Here are the 2026 cost drivers.
| Item | Range | Note |
|---|---|---|
| Scoping and field mapping | €2,000 – 5,000 | Align customers, products, statuses |
| Flow development (per direction) | €3,000 – 8,000 | Bidirectional ≈ 2x |
| Error handling and idempotency | €2,500 – 7,000 | Recovery, dedup, alerts |
| End-to-end testing | €2,000 – 6,000 | Real data sets |
| Documentation and handover | €1,000 – 3,000 | Runbook, monitoring |
| Supervision (recurring) | €300 – 900/mo | On-call, logs, dashboards |
Idempotency — guaranteeing that a replayed message doesn't create a duplicate — is the most underestimated item. Without it, a network incident can duplicate hundreds of records or ledger entries.
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Mini case study
Mark, IT director of a 240-person industrial mid-market firm in London, syncs SAP Business One and Salesforce. His sales reps re-keyed orders and delivery statuses by hand: roughly 20 hrs/week combined, at an average loaded cost of €32/hr, i.e. €640/week ≈ €33,000/year. The project — a bidirectional custom middleware — is quoted at €28,000 plus €90/month hosting and supervision. Payback in about 11 months, before counting fewer billing errors and a faster sales cycle. Over three years, net savings exceed €65,000.
FAQ
Do we need real-time or batch synchronization? Real time (webhooks) suits order/delivery statuses; nightly batch is fine for product reference data. A hybrid mode is often the best cost/freshness compromise, targeting under 5 minutes latency on critical flows.
What happens if the ERP or CRM is down? Good middleware queues messages and replays automatically, with idempotency to avoid duplicates. Set up alerts and a dashboard: aim for under 0.1% unhandled failed messages.
iPaaS or custom development to start? Under 20,000 operations/month with standard flows, iPaaS deploys faster. Beyond that, or with fine-grained business logic, custom becomes cheaper and more stable over 24 months.
How long to go live? Expect 6 to 12 weeks depending on flow count: 2–3 weeks scoping and mapping, 3–6 development, 1–3 acceptance testing with real data.
Who maintains the integration afterwards? Plan a supervision contract (€300–900/month) covering monitoring, vendor API change management and on-call. Salesforce and SAP APIs evolve several times a year and sometimes break unmaintained integrations.
Let's scope your project. Tell us your systems (ERP, CRM), the number of flows and monthly volume: we'll frame the scope, an indicative budget of €12,000–45,000 and a timeline. 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.
