The verdict in three sentences
Odoo is unbeatable when your processes resemble those of thousands of companies: you buy proven modules rather than rebuilding them. Custom wins when your trade has specifics that set you apart and no standard module covers them without costly contortions. The question isn't the upfront price but fit to your business and the 5-year TCO, licences included.
Deployment cost and cost per module
Odoo shows a low entry ticket, but per-user licences and modules add up.
| Item | Odoo | Custom |
|---|---|---|
| Build / integration | 15,000 - 60,000 EUR | 30,000 - 80,000 EUR |
| Per-user licence | 25 - 40 EUR/month | 0 EUR |
| Cost per added module | 3,000 - 8,000 EUR | included in dev |
| Deployment time | 6 - 16 weeks | 12 - 24 weeks |
| Business fit | 70 - 90% | 100% |
| Code ownership | no (vendor) | yes |
The per-user cost (25-40 EUR/month) is painless at 5 people, but becomes a heavy line at 50 or 100 users over several years.
5-year TCO: when each option wins
Over 5 years, the comparison depends mainly on user count and customization needs.
| 5-year scenario (30 users) | Odoo | Custom |
|---|---|---|
| Build / integration | 35,000 EUR | 60,000 EUR |
| Licences (30 x 30 EUR x 60 mo) | 54,000 EUR | 0 EUR |
| Customizations | 20,000 EUR | included |
| Hosting / maintenance | 12,000 EUR | 25,000 EUR |
| 5-year TCO | 121,000 EUR | 85,000 EUR |
| Ideal if | standard process | specific trade |
At 30 users over 5 years, Odoo licences (54,000 EUR) tip the scale toward custom; at 5 or 10 users, Odoo stays cheaper.
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Mini case study
Claire, CFO of an industrial SME in Lyon, must equip 30 staff with an ERP. Odoo: 35,000 EUR integration + 54,000 EUR licences over 5 years + 20,000 EUR customizations = 121,000 EUR. Custom: 60,000 EUR build, zero licence, 25,000 EUR maintenance = 85,000 EUR, i.e. 36,000 EUR saved over 5 years. But her order-management process is 100% standard: Claire ultimately picks Odoo for the accounting core and a custom module for her specific production tracking. The mix spares her rebuilding what already exists.
FAQ
Is Odoo cheaper than custom? At build time and for few users, yes. But per-user licences flip the math beyond 20-30 people over 5 years.
When is custom justified? When your trade has specifics that form your competitive edge, or when Odoo customizations exceed 20,000 EUR and jeopardize upgrades.
How much does an extra Odoo module cost? Expect 3,000 to 8,000 EUR of integration per business module, plus setup time. Over-customized modules complicate version upgrades.
Does Odoo cover every need? It covers 70 to 90% of standard processes. The remaining 10 to 30% require specific developments that bring the cost closer to custom.
Can you mix Odoo and custom? Yes, often optimal: Odoo for standard accounting and HR, custom connected via API for your differentiating core.
Let's scope your project. Tell us your user count, specific processes and budget: we price Odoo, custom or a mix, with a 5-year TCO to back it. 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.
