The verdict in three sentences
A custom ERP-CRM integration in Amsterdam costs 8,000 to 30,000 EUR depending on the number of synced objects and mapping complexity. An iPaaS (Make, n8n, Workato) runs 500-2,000 EUR/month but grows expensive beyond a certain volume, where a dedicated connector amortizes over 3 years. The real risk is not the build price but error handling and reconciliation, neglected in 7 of 10 projects.
What an integration really costs in 2026
The budget depends on the number of flows (one-way or two-way), record volume and transformations. Here are the 2026 orders of magnitude seen in the Amsterdam market.
| Scope | Flows | Timeline | Build cost (EUR) |
|---|---|---|---|
| Simple customer sync | 1-way, 1 object | 3-5 wks | 8,000 - 12,000 |
| Customers + orders | 2-way, 2 objects | 6-9 wks | 14,000 - 20,000 |
| ERP + CRM + invoicing | 2-way, 4+ objects | 9-14 wks | 22,000 - 30,000 |
| Real-time (webhooks) | event-driven | +2-3 wks | +4,000 - 8,000 |
| Historical backfill | migration | +1-2 wks | +3,000 - 6,000 |
Monthly maintenance runs 500 to 1,500 EUR/month: flow monitoring, mapping fixes when a field changes, handling API version upgrades.
iPaaS vs custom connector: the 3-year TCO
An iPaaS wins on speed to deploy, but its cost climbs with operation volume. Custom has a higher upfront cost but near-zero marginal cost.
| Item | iPaaS (Make/Workato) | Custom connector |
|---|---|---|
| Initial build | 4,000 - 10,000 EUR | 14,000 - 24,000 EUR |
| Subscription/month | 500 - 2,000 EUR | 0 EUR (hosting 50-150) |
| Maintenance/month | 300 - 800 EUR | 500 - 1,500 EUR |
| 36-month TCO (mid volume) | 42,000 - 90,000 EUR | 32,000 - 60,000 EUR |
| Vendor lock-in | High | None |
Under 50,000 operations/month, iPaaS stays cost-effective and fast. Above that, or with specific business rules (deduplication, scoring, multi-country VAT), the dedicated connector wins over 3 years.
Mini case study
Sarah, COO of a 90-employee industrial SME in Amsterdam, faces double entry between her ERP (Exact) and CRM (HubSpot). Two assistants spend 12 hours/week re-keying orders and contacts, about 1,250 EUR/month in labor. She chooses a two-way connector at 18,000 EUR plus 900 EUR/month maintenance.
Data-entry saving: 1,250 EUR/month. Recurring cost: 900 EUR/month. Net gain from month 1: 350 EUR, plus reliability (zero lost orders). The 18,000 EUR build is offset by fewer invoicing errors, estimated at 6,000 EUR/year. Full ROI in about 14 months.
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FAQ
How long for a complete ERP-CRM integration?
Expect 6 to 14 weeks depending on the number of objects and two-way flows. A simple one-way flow ships in 3-5 weeks.
iPaaS or custom: which to choose?
Under 50,000 operations/month, iPaaS (500-2,000 EUR/month) is faster. Above that, custom becomes cheaper on a 36-month TCO, often 30 to 40 % less.
What happens on a sync error?
A good connector logs each failure, auto-retries and alerts. Budget 10 to 15 % of the project for error handling and reconciliation.
Does the integration need ongoing maintenance?
Yes: ERP/CRM APIs evolve. Maintenance costs 500 to 1,500 EUR/month and covers version upgrades and mapping adjustments.
Can we sync in real time?
Yes, via webhooks, for about 4,000 to 8,000 EUR more. Otherwise a 15-minute batch is enough for most SMEs.
Let's scope your project. Tell us your systems (ERP, CRM, volumes) and priority flows: we'll price a dedicated connector or iPaaS with an indicative budget and 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.
