The verdict in three sentences
A successful ERP integration removes re-keying and makes a single source of truth flow between the ERP and the web app. Budget 8,000 to 30,000 EUR (excl. tax) depending on depth (native API vs middleware) and sync mode (real time vs batch). The real cost lies in connector maintenance (10-15%/year) and resilience against ERP version upgrades.
What it really costs in 2026
Price depends mainly on the number of synced objects (customers, items, stock, orders, invoices) and the quality of the ERP's exposed APIs. A recent Odoo exposes a clean API; an old Sage often requires middleware.
| Integration scope | Timeline | 2026 cost (EUR excl. tax) | Maintenance/year |
|---|---|---|---|
| Simple connector (1-2 objects, batch) | 4 weeks | 8,000 - 12,000 | 800 - 1,800 |
| Standard (customers + items + orders) | 6 weeks | 12,000 - 20,000 | 1,500 - 3,000 |
| Advanced (real time, stock + invoicing) | 8 weeks | 20,000 - 28,000 | 2,500 - 4,200 |
| Complex (multi-site, dedicated middleware) | 10 weeks | 28,000 - 30,000+ | 3,500 - 4,500 |
These 2026 orders of magnitude assume an accessible ERP (API or usable database) and a test environment provided by the vendor.
Direct API, middleware or batch: which to pick
The technical choice drives both cost and reliability. Real-time sync is smoother for users but pricier to maintain.
| Approach | Use case | Latency | Relative cost |
|---|---|---|---|
| Native ERP REST API | Modern ERP (Odoo, SAP S/4) | Real time | Medium |
| Middleware (iPaaS/ETL) | Heterogeneous ERPs, multi-flow | Near real time | High |
| Batch export/import | Stable volumes, tight budget | 1 to 24 h | Low |
| Webhooks + queue | One-off events (order) | Seconds | Medium |
Mini case study
Claire, CFO of a 45-employee industrial SME in Lyon, has every web order re-keyed into SAP: three people spend 2 h/day in total, i.e. 40 h/month. At a loaded cost of 32 EUR/h, that is 1,280 EUR/month, or 15,360 EUR/year, excluding errors. A standard connector at 17,000 EUR (excl. tax) with 2,400 EUR/year maintenance cuts re-keying by 80%. Annual saving: about 12,288 EUR; the investment pays back in under 15 months, then generates net gains.
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FAQ
Do you absolutely need an API on the ERP side?
No. If the ERP exposes no usable API, we use middleware or file export/import. Cost rises 15 to 30%, but integration remains possible on almost any ERP.
Real time or batch: what impact on price?
Batch is cheapest (from 8,000 EUR excl. tax) but introduces a delay. Real time adds a queue, error handling and replays, which explains a 20-40% premium.
What happens when the ERP is upgraded?
A major version upgrade can break the connector. That is why maintenance (10-15%/year) is essential: it covers regression testing and API adaptations.
How long until production?
Expect 4 to 10 weeks depending on scope, including 1-2 weeks of acceptance testing with your real data. An available ERP test environment from day one greatly shortens the timeline.
Let's scope your project. Tell us your ERP (SAP, Odoo, Sage), the objects to sync and the desired mode (real time or batch), and we will frame the connector. 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.
