When should you choose a standard ERP and when a custom development?

A standard ERP like Business Central is the right choice when processes are reasonably conventional (finance, purchasing, sales, warehouse, manufacturing, projects), when you need fast deployment, and when budget is limited. Custom development is only justified when processes are genuinely unique and constitute a competitive advantage — and even then, it usually ends up more expensive and riskier than extending an ERP with certified vertical modules.

What's the maintenance cost of custom development vs a standard ERP?

Custom development requires an in-house or outsourced technical team continuously maintaining, patching, and evolving the system (typically 15-25% of the development cost every year). Business Central shifts that cost to Microsoft: regular automatic updates, security patches, and new features, all included in the monthly subscription at no extra charge.

Can I customize Business Central without losing updates?

Yes, that's the major advantage of Business Central's AL extension model. Customizations are developed as extensions independent from the base code, which means Microsoft can keep updating the platform without breaking your customizations. Davisa's dv* extensions follow this model and remain compatible with every new release at no migration cost.

What kind of support and community back Business Central?

Business Central is backed by Microsoft with a guaranteed cloud SLA, official multilingual documentation, a network of more than 3,000 certified partners worldwide, very active user communities on LinkedIn, official forums with MVPs, and regular User Group meetings. A custom development depends exclusively on the team that built it.

What if my processes really are unique to my industry?

The most efficient path is to combine standard Business Central with a vertical extension specific to your industry. Davisa offers certified verticals (dvproject for construction and projects, dvproduction and dvquality for manufacturing, dvgmao for maintenance, dvscrap for packaging, dvretencionesgarantia for construction retentions). These extensions encapsulate industry logic without reinventing the base ERP.

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Business Central vs Custom ERP Development: Which Is Better?

Business Central with extensions or a custom-built ERP? If you're weighing which option fits your company best, keep reading.

5 min

Business Central vs Custom ERP Development: Which is the best option for your company?

The choice between Microsoft Dynamics 365 Business Central combined with a vertical extension and building your own custom management tool depends on several factors. And, except in very specific cases, the honest answer is that custom development rarely pays off compared to a well-extended standard ERP.

Here’s the full analysis, no sugar-coating.

The “custom development is cheaper” myth

Many SMBs enter the conversation believing custom development will be cheaper because “it only does what I need.” The actual math says otherwise:

Item	Custom development	Business Central + extension
Upfront investment	€80,000 - €300,000+	€25,000 - €80,000
Required technical team	Ongoing (2-5 people)	External partner on demand
Annual maintenance	15-25% of development (€12,000-€60,000)	Subscription + support (€10,000-€25,000)
Functional updates	New development each time	Automatic, included (2x year)
Regulatory adaptation (SII, Verifactu)	Build from scratch, compliance risk	Included as standard
Time-to-market for features	Months	Weeks
Key-person dependency risk	Critical (if the dev leaves, you’re stuck)	Mitigated (3,000+ partners)

Over 3-5 years, the TCO of a custom development is typically 2-3 times higher than BC + vertical extension. And the risk profile is radically worse.

The 5 real dimensions of the decision

1. Complexity and customization

Myth: “My processes are unique, I need custom development.”

Reality: 80-90% of any SMB’s processes (finance, purchasing, sales, warehouse, basic HR, standard manufacturing) are reasonably conventional. BC + vertical covers that 80-90% without writing a single line of code.

The remaining 10-20% — where real competitive differentiation lives — is covered with:

Custom AL extensions on top of BC (without touching the core, upgrade-compatible).
Power Platform (Power Apps, Power Automate) for auxiliary flows.
API integrations with other critical systems.

2. Implementation cost and time

Milestone	Custom development	BC + extension
Functional design	2-4 months	3-6 weeks
Development	6-18 months	0 weeks (standard) + 2-8 weeks customization
Testing and UAT	2-3 months	2-4 weeks
Go-live	12-24 months from kick-off	3-6 months from kick-off

3. Maintenance and updates

With Business Central, Microsoft handles:

Platform maintenance (servers, database, security).
Functional updates (2 major releases per year, automatic).
Security patches.
Regulatory updates (SII, Verifactu, AEAT forms, EU AI Act, etc.).

With custom development, you handle everything. And if your technical team leaves or shrinks, the system starts to degrade.

4. Support and community

Business Central is backed by:

3,000+ certified partners globally.
A very active community in Spanish (LinkedIn, forums, User Group) and across many languages.
Official forums with MVPs.
Official multilingual documentation.

Custom development depends exclusively on the team that built it. If that person or vendor disappears, the knowledge is lost.

5. Scalability and future needs

Business Central scales with:

Native multi-company and financial consolidation.
Multi-country with tax support included in 50+ countries.
Multi-language and multi-currency.
Native integration with Microsoft 365, Power BI, Power Platform, and Copilot.

Custom developments typically start out designed for one company, one country, one legal entity. Growing means redesigning.

The AL extension model: customization without losing upgrades

The major architectural advantage of Business Central over custom developments (and even over legacy NAV with C/AL) is the AL extension model:

Customizations are developed as independent extensions from the base code.
Microsoft keeps updating the platform without breaking your customizations.
Davisa’s dv* extensions follow this model and remain compatible with every new release at no migration cost.

This solves the classic legacy NAV problem: “I have NAV 2013 with so many modifications that upgrading to BC costs me €100,000.” With BC and AL, that problem disappears.

When custom development DOES make sense

There are real cases where custom development is worth it:

✓ Your core business is unique software that constitutes your competitive advantage (e.g. your own SaaS platform). ✓ Your operating model is genuinely unique and no ERP on the market models it even minimally (rare). ✓ You have a strong, stable in-house technical team capable of maintaining and evolving the system for 10+ years. ✓ You operate at a scale that justifies the investment (hundreds of millions in revenue with thousands of users).

For everyone else — 95% of SMBs and mid-market companies — BC + vertical extension is radically more efficient.

Davisa verticals: industry logic without reinventing the ERP

Davisa offers certified extensions that encapsulate industry-specific logic without touching the BC core:

Vertical	Industry
dvproject	Construction, engineering, real estate developers, project manufacturing
dvproduction	Discrete and process manufacturing
dvquality	Industrial quality control
dvgmao	Asset maintenance (industrial, facilities)
dvscrap	Packaging industry and scrap
dvretencionesgarantia	Construction with retention guarantees
dvfinance + dvimpuestos	Spanish finance-tax core (SII, Verifactu)
dvstock	Inventory optimization and forecasting
dvplanner	PMO and project planning

When NOT to migrate yet

⚠ If you’re in the middle of a critical project (plant opening, merger, etc.). ⚠ If your current system works reasonably well and migration doesn’t solve a specific problem. ⚠ If you don’t have an executive sponsor willing to lead the project.

Closing thoughts

The choice between Business Central and custom development depends on your needs, resources, and long-term goals. But the practical rule we’ve seen across 22+ years of projects: custom development is a decision that’s rarely justified and almost always costs more than planned.

Is your company torn between upgrading the current system or jumping to BC? Talk to a Davisa advisor and we’ll review your specific case — without selling you what you don’t need.

Learn more about Business Central

How we do it at Davisa

For industrial and facility assets, dvgmao is the native Business Central extension that replaces isolated maintenance software or custom developments with asset management, preventive plans, mobile work orders, and costs integrated with purchasing and stock — without reinventing the base ERP.

Talk to a Davisa advisor — 30 minutes, no commitment. We’ll tell you which critical processes in your current system could be replaced by standard extensions and how much cost/risk you’d avoid over the next 3-5 years.