The verdict in three sentences
Odoo wins when your processes fit the standard and you accept adapting to the software; custom ERP wins when your processes are your advantage and Odoo would need heavy customisation. The decisive question is not "what does the licence cost" but what do customisations, technical debt and version upgrades cost over 5 years. For a manufacturing SME, the TCO gap hinges on fit rate: below 70% native fit, Odoo gets expensive.
The real cost of both routes in 2026
Compare at equal scope: production, stock, purchasing, sales, accounting for 30 users.
| Item | Odoo (integrated) | Custom ERP |
|---|---|---|
| Licences / subscription | 25-60 EUR/user/month | 0 (owned) |
| Initial integration | 15,000-60,000 EUR | included in build |
| Build / development | per module | 60,000-150,000 EUR |
| Customisations | 800-1,500 EUR/day | included |
| Annual maintenance | subscription + support | 12-18% of build |
| Version upgrade | risk of re-dev | controlled in-house |
For 30 users, Odoo means 9,000-21,600 EUR/year in licences before integration; each block of heavy customisation quickly adds 10,000-30,000 EUR.
Five-year TCO: the real match
The curves cross over time. 2026 order of magnitude for 30 users.
| Year | Heavily customised Odoo | Custom ERP |
|---|---|---|
| Year 1 | 55,000-90,000 EUR | 90,000-150,000 EUR |
| Year 2 | 25,000-40,000 EUR | 15,000-22,000 EUR |
| Year 3 | 25,000-45,000 EUR | 15,000-22,000 EUR |
| Year 4 | 30,000-50,000 EUR (upgrade) | 15,000-25,000 EUR |
| Year 5 | 25,000-45,000 EUR | 15,000-25,000 EUR |
| 5-year total | 160,000-270,000 EUR | 150,000-244,000 EUR |
Odoo is cheaper to enter; custom often catches and passes Odoo from year 3-4 as customisations and upgrade re-development pile up.
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Mini case study
Sophie runs a precision-engineering SME in Berlin: 30 staff, specific production processes (variant BOMs, in-house quality control). Odoo quote: 40,000 EUR integration + 14,400 EUR/yr licences + 45,000 EUR customisation over 2 years. Custom quote: 110,000 EUR + 18,000 EUR/yr. Over 5 years, Odoo reaches ~225,000 EUR, custom ~182,000 EUR, and above all the ERP fits her BOMs 100%, avoiding 12 hrs/week of re-keying, roughly 28,000 EUR/year of recovered time.
FAQ
Is Odoo really cheaper? At entry, yes. Over 5 years, once customisations exceed 40-50,000 EUR the gap narrows and custom often moves ahead.
What is Odoo's hidden risk? Version upgrades: each heavy customisation must be re-tested, sometimes re-developed, potentially costing 20,000-50,000 EUR every 2-3 years.
When to clearly choose custom? When your production or management processes are your competitive edge and Odoo would fall below 70% native fit.
How long to deploy? Standard Odoo: 2-4 months. Heavily customised Odoo or custom ERP: 5-9 months depending on scope.
Can I start small then switch? Yes: start Odoo on standard modules, then custom-build strategic pieces via API is a valid hybrid strategy.
Let's scope your project. Give us your headcount, modules and production specifics: we price Odoo vs custom with a 5-year TCO. 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.
