The verdict in three sentences
A reliable ERP-website connector costs between EUR 8,000 and EUR 25,000 in London in 2026, depending on the number of flows (stock, prices, customers, orders) and the API your ERP exposes. The real payoff is not technical but operational: removing double data entry (roughly 1 FTE) and ending wrongly displayed stock-outs that drive B2B buyers away. Budget 6 to 12 weeks to deliver and EUR 400-1,200/month of support to absorb ERP upgrades.
What an ERP connector costs in 2026
The budget hinges mostly on the maturity of your ERP's API and the number of flows to sync. A recent Sage 100 exposes decent APIs; an older SAP often requires exchange middleware (files or a message queue).
| Scope | Flows synced | Budget EUR | Timeline |
|---|---|---|---|
| Simple connector | Stock + prices (read-only) | 8,000 - 12,000 | 6 wks |
| Standard connector | Stock, prices, product data, customers | 12,000 - 18,000 | 8 wks |
| Two-way connector | + web orders sent back to the ERP | 18,000 - 25,000 | 10-12 wks |
| Dedicated middleware | Multi-system exchange bus | +6,000 - 10,000 | +3-4 wks |
| Monthly support | Monitoring, fixes, version upgrades | 400 - 1,200 /mo | ongoing |
Support is not optional: every ERP or CMS upgrade can break a field mapping. A monitoring contract prevents silent incidents where stock stops syncing with no alert.
Real-time API or batch sync
Two architectures compete, and the choice weighs on both budget and customer experience.
| Criterion | Real-time API | Batch (every X min) |
|---|---|---|
| Stock freshness | Immediate | 5 to 60 min lag |
| Development cost | +20 to 35% | Baseline |
| Load on the ERP | High (must be scoped) | Low, scheduled |
| Risk of wrong stock-out | Near zero | Low to moderate |
| Best for | High-turnover products | Stable catalogue |
For a high-turnover B2B spare-parts catalogue, real-time pays off fast: an order placed on a sold-out item triggers a dispute, a refund and lost trust. For a stable catalogue, a 15-minute batch is plenty and cheaper to maintain.
Mini case study
Mark, IT director of an industrial-supplies distributor in London, has two people manually re-key web orders into Sage. Cost: about 1 FTE at EUR 42,000 loaded/year, plus 3% of orders with a price or stock error. He invests EUR 17,000 in a two-way connector and EUR 700/month of support (EUR 8,400/year).
Annual gain: EUR 42,000 of avoided data entry + EUR 6,000 fewer disputes = EUR 48,000. Year-1 cost: 17,000 + 8,400 = EUR 25,400. The connector pays back in just over 6 months, then nets more than EUR 39,000/year from year 2 onward.
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FAQ
How long to connect an ERP to a site in 2026?
Budget 6 to 12 weeks depending on the ERP's API quality and the number of flows. A read-only connector (stock + prices) starts at 6 weeks; a two-way flow returning orders reaches 10 to 12 weeks.
Do I need middleware or can I connect directly?
If the ERP exposes a clean REST API, a direct connection is enough. For an older SAP or several systems to orchestrate, middleware adds EUR 6,000-10,000 but makes exchanges more reliable and centralised.
What does maintenance cost after go-live?
Support of EUR 400-1,200/month covers monitoring, fixes and adapting to upgrades. It is the insurance that sync will not stop without an alert, which happens in more than half of unsupervised projects.
Real-time or batch: which should I pick?
Real-time costs 20 to 35% more but nearly eliminates wrongly displayed stock-outs. For a high-turnover catalogue it pays back within months; for a stable catalogue a 15-minute batch is cheaper.
Can we sync prices per B2B customer?
Yes, provided the ERP holds the pricing tiers. Syncing account-negotiated prices adds about EUR 2,000-4,000 but avoids invoicing errors, which are very costly in B2B.
Let's scope your project. Tell us your ERP, the number of flows to sync and an indicative budget, and we'll scope the right 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.
