The verdict in three sentences
A CRM-ERP-billing synchronization connector links your systems so data entered once flows everywhere without re-keying. In London in 2026, expect 12,000 to 30,000 EUR depending on the number of flows, mapping complexity and whether sync is bidirectional. The payback comes from eliminating double data entry and cleaning up your customer, product and invoice data.
What drives a connector's price
Budget depends mostly on how many systems you link, the direction of flows (one-way or two-way) and conflict handling when two systems edit the same record.
| Line item | 2026 range (EUR) | What moves it |
|---|---|---|
| Scoping & data mapping | 2,000 - 5,000 | Number of entities, business rules |
| One-way connector (2 systems) | 6,000 - 12,000 | Volume, available APIs |
| Bidirectional sync + conflicts | 12,000 - 22,000 | Priority rules, deduplication |
| Billing linked (3rd system) | +4,000 - 9,000 | Numbering, VAT, credit notes |
| Monitoring & error recovery | 2,000 - 4,000 | Alerts, replays, logs |
Bidirectional sync is the riskiest item: without clear conflict rules, a CRM and an ERP can overwrite each other. That's where reliability is won or lost.
Recurring costs to plan for
A connector is a living asset: APIs change, volumes grow, edge cases get refined.
| Recurring item | 2026 ballpark | Frequency |
|---|---|---|
| Middleware / iPaaS hosting | 80 - 400 EUR | per month |
| Evolutionary maintenance | 150 - 600 EUR | per month |
| Supervision & alerts | 60 - 200 EUR | per month |
| Major API version upgrade | 1,500 - 5,000 EUR | per year (estimate) |
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Mini case study
Mark, IT director of a B2B distribution SME in London (48 staff), has every order re-keyed into the CRM, then the ERP, then the billing tool. Two people spend around 3 hours a day combined, roughly 60 hours a month. At a loaded cost of 34 EUR/h, that's ~2,040 EUR/month, before entry errors (credit notes, disputes). A bidirectional connector at 19,000 EUR removes 80% of that keying: ~1,600 EUR/month saved, a payback of about 12 months, even before the quality gain.
FAQ
Do we need an iPaaS (Make, n8n, Zapier) or a custom connector? For 2-3 simple flows, an iPaaS at 80-400 EUR/month is often enough. Once business logic is rich (VAT, discounts, deduplication), custom at 12,000-30,000 EUR is more reliable and cheaper long-term.
How long to deliver? Plan 2 to 4 months: 2-3 weeks scoping/mapping, 6-10 weeks of build and testing, then a supervised cutover. Bidirectional projects sit at the top of the range.
What happens if an API goes down? A good connector queues messages, replays automatically and alerts the team. Budget 2,000-4,000 EUR for error recovery and monitoring.
Can we keep our current software? Yes, in 90% of cases. The connector adapts to your existing CRM/ERP via their APIs. Replacing a tool is only needed when it exposes no usable API.
How do we avoid duplicate customers? With a deduplication rule (company number, email, normalized phone) defined at scoping. Settle this mapping point early, or conflicts explode in production.
Let's scope your project. Tell us your systems (CRM, ERP, billing tool), the flow direction and monthly order volume, and we'll frame the connector and its 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.
