SAP is the de facto standard in enterprise ERPs. Over 70% of Fortune 500 companies use it, and its ecosystem is the most complete on the market. But SAP is not the only option for mid-sized and large companies that need robust management software. Custom development has matured enough to be a real alternative in many scenarios.
At Soamee we have worked with companies that had SAP and needed complementary modules that were more efficient to develop outside the SAP ecosystem. We have also built complete management systems for companies that evaluated SAP and decided it wasn’t the right option for them. This guide helps you make that decision with real data.
The Real Cost of SAP (That Nobody Tells You Upfront)
SAP pricing is notoriously opaque. Real costs are typically 3-5x what you expect initially.
Direct SAP Costs
| Concept | Market range |
|---|---|
| SAP S/4HANA licenses (perpetual) | 3,000 - 8,000 EUR/user |
| Annual maintenance (22% of licenses) | 660 - 1,760 EUR/user/year |
| SAP S/4HANA Cloud (subscription) | 200 - 500 EUR/user/month |
| Implementation (partner) | 150,000 - 2,000,000 EUR |
| Functional consulting | 150 - 300 EUR/hour |
| Custom ABAP development | 120 - 250 EUR/hour |
| Data migration | 30,000 - 200,000 EUR |
| User training | 20,000 - 80,000 EUR |
Hidden Costs
- Infrastructure: SAP on-premise requires powerful servers (HANA needs lots of RAM)
- Forced upgrades: SAP forces updates requiring re-validation of all custom processes
- Ongoing consulting: you need SAP consultants for any significant change
- Integrations: connecting SAP with modern systems (REST APIs, microservices) is non-trivial
- Named users: every person accessing needs their license, even for sporadic queries
Example: Total 5-Year Cost (100-user company)
| Concept | SAP S/4HANA | Custom development |
|---|---|---|
| Licenses/initial development | 500,000 EUR | 200,000 EUR |
| Implementation | 400,000 EUR | (included) |
| Maintenance year 1-5 | 550,000 EUR | 125,000 EUR |
| Customizations | 200,000 EUR | 100,000 EUR |
| Infrastructure | 150,000 EUR | 75,000 EUR |
| Total 5 years | 1,800,000 EUR | 500,000 EUR |
Numbers vary enormously by complexity, but the total cost difference is consistent: SAP is typically 2-4x more expensive than an equivalent custom development.
When SAP Is the Right Choice
Your company revenues exceed 100M EUR with multinational operations
SAP is designed to manage multinational complexity: multi-currency, multi-legislation, financial consolidation, transfer pricing, and regulatory compliance in 50+ countries. If you operate in 10+ countries with different legal requirements, SAP has localization already solved. Replicating that custom is possible but extremely expensive.
Your auditors or investors require SAP
In some sectors and for certain institutional investors, having SAP is a non-negotiable requirement. If you’re preparing for an IPO or acquisition by a group that uses SAP, implementing it beforehand can facilitate due diligence.
You need native integration with partners using SAP
If your main clients or suppliers exchange data via SAP IDocs, RFC, or BAPI, native integration is much simpler than building bridges from a custom system.
Your sector has specific SAP templates
SAP has vertical solutions for automotive, pharma, retail, utilities, and other sectors with pre-configured process templates. If your sector has one and your processes fit, implementation is faster and proven.
You need a large talent ecosystem
There are over 100,000 SAP consultants worldwide. If you need to rapidly scale your support team or change implementation partners, the SAP ecosystem gives you options that a custom system cannot offer.
When Custom Development Is Better
Your processes differ significantly from SAP standard
SAP works well when your processes fit its model. But if you need to customize more than 30-40% of SAP, customization complexity (and cost) quickly exceeds building from scratch. SAP customizations (ABAP, BADI, enhancements) are technically complex and fragile during upgrades.
Your company revenues are between 5 and 50M EUR
For mid-sized companies, SAP is typically oversized. The total cost of ownership isn’t justified when the business doesn’t need the multinational complexity SAP solves. Custom development or a customized ERP like Odoo covers needs at a fraction of the cost.
You need iteration speed
SAP has slow change cycles. A change that takes 1-2 weeks in a custom system can take 2-3 months in SAP between functional analysis, ABAP development, transport between environments, and validation. If your business needs to pivot quickly or experiment with new processes, SAP slows you down.
Your competitive advantage is in unique processes
If what differentiates you from competition is a unique operational process (differentiated logistics, dynamic pricing, special relationship management), building it custom gives you an advantage competitors cannot replicate by buying the same SAP license.
You want technological independence
With SAP you’re tied to their roadmap, product decisions, and update cycles. If tomorrow SAP decides to discontinue a module or raise prices by 30%, you have few options. With custom development, intellectual property is yours and you can evolve the system according to your priorities.
The Hybrid Model: SAP + Custom Development
An increasingly common strategy is using SAP for what it does well (financial accounting, controlling, multinational compliance) and building custom modules for specific processes that integrate with SAP via API.
Example hybrid architecture
[SAP FI/CO] ← API → [Custom sales system]
↑ ↑
| |
[SAP MM] ← API → [Mobile app for sales reps]
↑
|
[SAP HCM] ← API → [Custom employee portal]Advantages of this model:
- SAP manages accounting and compliance (where it’s strong)
- Custom modules manage specific business processes (where SAP is rigid)
- Integration via modern APIs (REST/GraphQL) instead of legacy protocols
- Each component can evolve independently
When the hybrid model works
- You already have SAP implemented and don’t want to migrate everything
- You need SAP for compliance but your business processes are very custom
- You want a gradual transition from SAP to custom (or vice versa)
- Your SAP team is overloaded and you need agility in specific modules
Migration from SAP to Custom
If you already have SAP and are evaluating migration to custom development, the approach is similar to any legacy software migration: incremental, module by module, with both systems running in parallel.
The typical migration order is:
- First: modules SAP handles poorly (client portal, mobile apps, custom reporting)
- Then: specific business modules (sales, operations)
- Last: accounting and compliance (where SAP is strongest and migration is riskiest)
Not all companies need to migrate everything. Many stay with the hybrid model indefinitely.
Decision Process
- Calculate the 5-year TCO of both options with real data (get quotes from SAP partners and development agencies)
- Evaluate functional fit: what percentage of your processes fit standard SAP
- Consider time-to-value: when you need the system operational and how long you can wait
- Assess risk: what happens if the project fails or is delayed in each scenario
- Talk to similar companies: get references from both SAP implementations and custom developments in your sector
Conclusion
SAP is the right option for large multinational corporations with standard processes and corresponding budget. Custom development is better for mid-sized companies with specific processes, limited budget, or need for agility. And the hybrid model is probably the smartest option for companies that have SAP but need flexibility in specific processes.
The worst decision is implementing SAP because “that’s what big companies do” without evaluating whether you actually need that complexity and cost. Equally, the worst decision on the custom side is underestimating the complexity of building a robust custom ERP.
If you need help evaluating your case, schedule a free consultation with our team. We analyze your situation without bias: if SAP is the best option, we’ll tell you.