The verdict in three sentences
A packaged ERP (Odoo, Sage) at EUR 25-70/user/month plus EUR 15,000-60,000 integration covers most standard distributors. A custom ERP (EUR 70,000-160,000 + 15-20%/year maintenance) makes sense when your customer price lists, supplier EDI or multi-warehouse logic exceed the product's scope. The real gain is measured on stock rotation, price reliability and 2026 e-invoicing compliance.
Packaged or custom: the underlying math
The distributor chooses between a proven product to adapt and a build that fits its processes. Odoo attracts with its entry cost and ecosystem; custom wins when pricing and logistics complexity become a competitive edge.
| Criterion | Packaged ERP (Odoo/Sage) | Custom ERP |
|---|---|---|
| 2026 license | EUR 25-70/user/month | None |
| Integration | EUR 15,000-60,000 | EUR 70,000-160,000 |
| Maintenance | Included + support | 15-20%/year |
| Go-live | 2-5 months | 5-9 months |
| Business fit | 70-90% | 95-100% |
| Extensibility | Vendor-bound | Full |
For 20 users, Odoo at EUR 45/month is EUR 10,800/year in license, plus integration. Over five years with evolutions, the packaged bill often reaches EUR 90,000-130,000: in that zone, custom becomes competitive again.
The features that weigh on margin
Multi-warehouse management and customer price lists are the two most sensitive bricks in distribution. Supplier EDI and 2026 e-invoicing drive compliance and processing speed.
| Feature | Expected 2026 gain | Standard Odoo | Custom |
|---|---|---|---|
| Multi-warehouse | Reliable real-time stock | Yes | Fine rules |
| Customer prices/discounts | -50% price errors | Partial | Full |
| Supplier EDI | -3 to -5 days purchase cycle | Module | Native |
| 2026 e-invoicing | Mandatory compliance | Yes | Yes |
| E-commerce/accounting connectors | Zero double entry | Connectors | Custom |
| Stock rotation analytics | +10-20% rotation | Basic | Advanced |
A multi-site distributor prioritizes multi-warehouse and auto-replenishment; a B2B distributor bets on price lists and EDI.
Mini case study
Claire is CFO of a Nantes distributor: 3 warehouses, 22 users, 4,500 SKUs. Reps apply customer prices in Excel, causing about 2% price errors on EUR 6.5M revenue, i.e. EUR 130,000/year in lost margin and credit notes. A custom ERP at EUR 120,000 + EUR 21,000/year maintenance, with centralized price lists, multi-warehouse and compliant e-invoicing, brings errors to 0.3%. Price-error savings reach about EUR 110,000/year; added to stock-rotation gains, break-even lands around 18 months.
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FAQ
Is Odoo enough for a multi-warehouse distributor?
Often yes up to a certain pricing and logistics complexity. Beyond that, custom developments on Odoo end up costing as much as a better-controlled custom build.
Is e-invoicing mandatory in 2026?
France's reform progressively mandates e-invoicing and e-reporting for companies. Your ERP must comply with the timeline applicable to your size.
What does packaged-ERP integration cost?
Between EUR 15,000 and 60,000 by module count, connectors and data migration. It is a line item separate from the license, often underestimated.
What realistic gain on price errors?
Centralized, auto-applied price lists cut errors by 50% or more. On high revenue it is the fastest savings line to pay back.
How long for a custom ERP?
Between 5 and 9 months by scope. A purchasing/stock/sales/billing core ships in 5-6 months; EDI and e-commerce connectors follow.
Let's scope your project. Give us your warehouses, SKU count, price lists and target connectors, and we will price an integrated packaged or custom ERP. 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.
