The verdict in three sentences
A custom CRM-ERP integration costs between 12,000 and 30,000 EUR excl. VAT in 2026 for two systems and a few synced objects, and 40,000 to 90,000 EUR for real-time multi-flow with advanced error handling. The heavy cost is not the "pipe" but the business mapping, error recovery and monitoring. The ROI is tangible: -50 % data entry, reliable data and consolidated reporting that unblocks decisions.
What the budget actually covers
The price of an integration is not just the connector code. Most of the cost comes from flow analysis (which objects, which direction, how often), mapping between incompatible data models (a Salesforce "account" is not an SAP "business partner"), error handling and monitoring. A middleware architecture (central bus) costs more upfront than a point-to-point link but pays off from the third flow onward.
| Cost item 2026 | Point-to-point | Middleware / iPaaS |
|---|---|---|
| Scoping & mapping | 3,000 - 6,000 EUR | 5,000 - 10,000 EUR |
| Connector development | 6,000 - 15,000 EUR | 10,000 - 30,000 EUR |
| Error handling & retry | 2,000 - 5,000 EUR | 4,000 - 12,000 EUR |
| Monitoring & alerts | 1,500 - 4,000 EUR | 3,000 - 8,000 EUR |
| Middleware hosting / month | 50 - 150 EUR | 150 - 300 EUR |
Simple or complex: where does your project sit
Complexity depends on the number of objects, the sync direction and the required freshness. Pushing a catalog from CRM to ERP once a night is simple; a real-time two-way sync of quotes, orders and invoices is an engineering project.
| Scenario | Synced objects | Frequency | Budget 2026 |
|---|---|---|---|
| CRM contacts → ERP | Accounts, contacts | Nightly | 12,000 - 18,000 EUR |
| Quotes & orders | + orders, products | Hourly | 20,000 - 35,000 EUR |
| Two-way invoicing | + invoices, payments | 15 min | 40,000 - 65,000 EUR |
| Real-time multi-flow | All objects, 2 ways | Event-driven | 65,000 - 90,000 EUR |
| Annual maintenance | Support & changes | - | 15 - 20 % of build |
Mini case study
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Claire, CFO of a 60-employee industrial SME in Lyon, suffers from double entry between HubSpot (sales) and Sage (accounting). Two assistants each spend 2 h/day re-keying orders and contact details, i.e. 4 h/day × 220 days = 880 h/year. At a loaded cost of 32 EUR/h, that is 28,160 EUR/year of unproductive time, not counting re-entry errors. She invests 26,000 EUR excl. VAT in a two-way sync of accounts, orders and invoices. In year one, re-keying drops 50 %, saving 14,080 EUR, and better reliability avoids several credit notes. The project pays back in about 22 months, then delivers a recurring net gain.
FAQ
Do I always need middleware? No. For two systems and one or two flows, a point-to-point link at 12,000-18,000 EUR excl. VAT is enough. Middleware makes sense from 3 flows or if you plan to add more tools, since it shares mapping and monitoring.
How much is maintenance? Budget an annual support contract of 15 to 20 % of the build cost, i.e. 3,000 to 15,000 EUR. APIs change, volumes grow: without monitoring, a silent failure can corrupt data for days.
Can I use Zapier or Make instead? For low volumes and simple mappings, yes, at 30-500 EUR/month. Beyond that (high volumes, business logic, real time, strict GDPR), iPaaS costs explode and a custom connector becomes cheaper again.
How long to deliver? A simple integration takes 4 to 6 weeks, a real-time multi-flow project 3 to 5 months, including testing and a phased cutover.
How do I avoid data loss? Require idempotency (replaying a message without duplicates), a retry queue on errors and alerts. These three items are 20 to 30 % of the budget but prevent disasters.
Let's scope your project. Describe your systems (CRM, ERP), the objects to sync and the freshness you need: we will price a point-to-point or middleware architecture with an indicative budget. 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.
