For enterprise websites running on .NET platforms, Umbraco’s open-source flexibility offers both creative and technical control. But while its core features offer significant value out of the box, the true potential lies in extending its capabilities with custom modules. Whether you’re building for internal workflows or customer-facing tools, crafting bespoke modules can reduce long-term maintenance, increase site longevity, and give your development team a major edge. Still, many teams approach Umbraco customization like they would any other CMS, often neglecting architectural considerations specific to Umbraco’s architecture.
That misalignment introduces technical debt. So, what does it actually look like to follow best practices when building a custom module in Umbraco?
Understand the Role of Composition
Rather than rely on inheritance-heavy models, Umbraco leans heavily on composition. Compositions in Umbraco allow you to reuse property groups and fields across multiple document types without redundant configuration. If your module depends on multiple types of content, this model makes your development cleaner and more scalable. Instead of building one-off modules each time a business request comes through, compositions allow you to build reusable logic across the project.
Modular planning isn’t about abstraction for the sake of it—it’s about avoiding hardcoded content assumptions. That includes your use of compositions, document types, custom data sources, and code-behind logic.
Keep Views and Logic Clearly Separated
Many developers coming from other CMS platforms are tempted to put business logic directly in Razor views. But this leads to bloated views, difficult debugging, and more painful upgrades. Best practice calls for keeping all logic that queries content or processes user input within controllers or external service layers. Razor views should only focus on display.
In high-traffic applications, this separation also makes caching easier. Your logic layer can handle pre-processing and caching decisions, while the Razor layer simply renders what it receives. For content-heavy modules—like faceted search, interactive charts, or dashboards—this kind of separation is essential to ensuring fast response times under load.
Avoid Performance Bottlenecks with Smart Caching
Umbraco is fast, but like any CMS, it can be slowed down by poor caching strategies. When you’re building a custom module, especially one that handles dynamic content, you should consider multi-tiered caching.
Use Umbraco’s in-memory cache for quick access to stable content. For data that changes frequently or needs to be real-time (e.g., user-generated content, inventory, booking data), offload to an external source like Redis or SQL Server. And always use dependency injection to make your caching logic testable and swappable, rather than hardcoded.
It’s also worth mentioning Umbraco’s Examine search engine. For any custom module that involves content indexing or querying large sets of content nodes, Examine should be configured properly—custom indexes, analyzers, and field mapping—to ensure your content loads quickly and accurately.
Don’t Rely Too Heavily on Surface Controllers
Surface controllers are often used for forms, but many developers overuse them for general logic. While they’re quick to implement, they tie you tightly to MVC rendering pipelines and can complicate testing.
Instead, design your custom modules with controller abstraction in mind. That allows for unit testing and parallel development. Your front end and logic layers can evolve independently, which is especially helpful in multi-team environments or when using headless delivery patterns.
Version Control Isn’t Just for Code
When dealing with custom modules in Umbraco, it’s important to remember that some components—like document types and data types—are configured via the back office, not code. That makes them easy to forget when syncing between environments.
Use tools like uSync or Deploy to ensure your module’s configuration is treated like source code. If a module relies on a specific document type, that should be version-controlled and deployable like any other part of the solution.
Failing to do this means your local module may work fine, but fall apart in staging or production. Worse, you may lose part of your configuration if a database is rolled back.
Build with Editors in Mind
You’re not just building a module for technical use—you’re building for editors too. A technically brilliant custom module that’s unusable or confusing in the CMS is a liability.
Use clear labeling, intuitive property groupings, and helpful descriptions within the Umbraco back office. If your module includes a complex UI, consider building custom dashboards using AngularJS and Umbraco’s extensibility points. This ensures the editors who rely on your module can operate confidently and efficiently.
Test How It Fails, Not Just How It Works
Edge cases and fail states often get ignored until they appear in production. When testing your Umbraco custom modules, don’t just validate success conditions. Test what happens when required data is missing, when user input is malformed, or when a dependent API is unavailable.
Graceful failure handling builds trust with editors and end users. If a module silently crashes or shows cryptic error messages, its long-term viability drops fast.
Plan for Upgrade Paths and Legacy Compatibility
Umbraco releases frequent updates, and while major version changes are not frequent, they can introduce breaking changes. When you build a custom module, you’re creating a code asset that must survive beyond a single project version.
Document every dependency. Avoid private APIs or undocumented hooks. And always build with the assumption that your module might one day need to run on a newer Umbraco version—or be removed cleanly without disrupting the rest of the site.
Also, as Umbraco continues its shift toward composable DXP and headless functionality, consider how future integrations—REST APIs, GraphQL, or external SaaS tools—might impact your module’s architecture.
Security Should Be Built-In, Not Added Later
All custom modules should follow basic security hygiene: sanitize inputs, follow least-privilege access controls, and audit for XSS and CSRF risks. But in Umbraco, you should also pay special attention to the Member and User APIs.
If your module interacts with sensitive content or user data, don’t assume that the presence of a login equates to correct permissions. Umbraco offers fine-grained permissions—use them. And never expose internal APIs unless absolutely necessary.
Professionalization of Umbraco Modules
As Umbraco gains more enterprise-level adoption, clients are increasingly expecting production-ready modules that follow software engineering standards—not just “code that works.” That means CI/CD pipelines for deployment, integration testing, documentation, and analytics hooks.
When these practices are embedded into your Umbraco development cycle, the custom modules you deliver are no longer just code—they’re products. This raises stakeholder confidence and helps secure long-term buy-in from project sponsors.
In the broader context of enterprise CMS development, umbraco development isn’t just about using a flexible tool—it’s about using that flexibility with discipline. Following best practices ensures your custom modules are scalable, maintainable, and editor-friendly.
Sometimes, great Umbraco development doesn’t feel flashy at all. It feels quiet, predictable, and surprisingly invisible—just like the best infrastructure usually does.
