The verdict in three sentences
A CRM/ERP connector is not a simple export: it is a bidirectional flow with mapping, error handling and monitoring. In Berlin in 2026, budget 8,000 to 30,000 EUR depending on the number of synced objects and rule complexity. The payoff: no more double entry, reliable data and credible forecasts.
Cost by systems and mapping
Price depends on the connected systems, flow direction (one-way or bidirectional) and object volume (contacts, quotes, orders, invoices, stock). 2026 ranges (order of magnitude).
| Scope | Connector cost (EUR) | Monthly maintenance | Main gain |
|---|---|---|---|
| One-way sync (1 object) | 8,000 - 12,000 | 300 - 600 | end of basic re-entry |
| Bidirectional (2-3 objects) | 12,000 - 20,000 | 500 - 1,000 | reliable data both sides |
| Multi-object + business rules | 20,000 - 30,000 | 900 - 1,800 | reliable forecasts |
| Multi-system (CRM+ERP+e-commerce) | 30,000 - 50,000 | 1,500 - 3,000 | unified 360 view |
Error handling (retry queue, alerts, logging) is 20 to 30 % of the effort but prevents the silent desyncs that pollute reports for months.
Maintenance, monitoring and reliability
| Line item | 2026 range | Note |
|---|---|---|
| Scoping + field mapping | 3,000 - 10,000 EUR | decisive step |
| Connector development | 5,000 - 25,000 EUR | by objects and rules |
| Monitoring + alerts | included in maintenance | flow dashboard |
| Monthly maintenance | 300 - 3,000 EUR | upstream API changes |
| Delivery time | 4 to 10 weeks | by number of objects |
Vendor APIs (HubSpot, Salesforce, SAP, Odoo, Dynamics) evolve: without maintenance, a connector eventually breaks. Monitoring turns a silent failure into an alert handled within hours.
Mini case study
Nadia is CIO of a distribution SME in Berlin: reps enter orders in HubSpot, then an assistant re-keys them into Odoo, ~15 min/order for 900 orders/month, or 225 h/month. She deploys a bidirectional connector at 19,000 EUR and 800 EUR/month maintenance. Removing re-entry, she recovers ~200 h/month. Valued at 28 EUR/h, that is ~5,600 EUR/month, ~67,000 EUR/year, not counting fewer order errors. The connector pays back in under 5 months.
FAQ
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How much does a custom CRM/ERP connector cost?
Between 8,000 and 30,000 EUR in 2026 depending on synced objects and rule complexity. Multi-system projects exceed 30,000 EUR.
Is monthly maintenance required?
Yes: 300 to 3,000 EUR/month depending on scope. Vendor APIs change regularly; without monitoring, a sync can break with no alert.
Is a bidirectional flow essential?
Not always. If one source is authoritative (ERP for invoices, CRM for contacts), a one-way flow suffices and costs less. Bidirectional is justified when both systems edit the same objects.
How long to deliver?
4 to 10 weeks depending on the number of objects and business rules. Mapping scope is the most decisive step for hitting the timeline.
What do we gain concretely?
The end of double entry, consistent data on both sides and reliable forecasts. Many SMEs recover several hundred hours per year and cut order errors.
Let's scope your project. Specify your systems (CRM, ERP, e-commerce), objects to sync and flow direction: we price connector and maintenance. 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.
