Sitecore to Drupal Migration: The Complete Technical Guide

The migration from Sitecore to Drupal is one of the most common and structurally sound architectural shifts in the modern enterprise landscape. Organizations—particularly in highly regulated sectors like banking, government, and higher education—are increasingly abandoning the exorbitant licensing fees and inflexible .NET monolithic structures of Sitecore. In its place, they are adopting Drupal 10: a wildly powerful, open-source, enterprise-grade CMS framework built on PHP and Symfony.

Drupal is often considered the most "natural" successor to Sitecore because they share similar philosophies regarding highly structured data. Both systems excel at managing complex, deeply relational content models, granular user permissions, and massive taxonomy vocabularies. However, Drupal achieves this without the multi-million dollar vendor lock-in, and it integrates far more elegantly with modern decoupled (headless) React or Next.js frontends.

This 3,000-word technical guide serves as a definitive blueprint for Lead Architects tasked with executing a flawless migration. We will dissect the granular details of mapping Sitecore Templates to Drupal Content Types, extracting heavily fragmented SQL data via PowerShell, and orchestrating the data ingestion using the formidable Drupal Migrate API (ETL pipeline).

Before any data is extracted, the Information Architecture (IA) must be mapped. Sitecore and Drupal manage content structures similarly, but the terminology and underlying database schemas differ drastically.

Mapping the Content Models

• Sitecore Templates to Drupal Content Types: In Sitecore, everything is an Item based on a Template. In Drupal, data is separated into Entities (Nodes, Users, Taxonomy Terms). A Sitecore Press Release Template must be explicitly mapped to a Drupal Press Release Content Type.
• Sitecore Fields to Drupal Fields: Sitecore's Single-Line Text maps to Drupal's Text (Plain). Sitecore's Rich Text maps to Drupal's Text (Formatted, Long).
• Sitecore TreeLists to Entity References: Sitecore uses TreeLists and Multilists to create relationships (e.g., assigning a "Category" to a "Blog"). In Drupal, these are mapped to Entity Reference fields, pointing to specific Taxonomy Vocabularies or other Node types.

Presentation Mapping

Sitecore relies on Renderings, Sublayouts, and Placeholders for its presentation layer (often managed via the Experience Editor). Drupal handles this via Layout Builder or Paragraphs. You must audit every single Sitecore Rendering and determine its Drupal equivalent. If the enterprise is moving to a headless architecture, these Renderings will instead map directly to React components in the Next.js frontend repository.

Sitecore does not use standard relational database tables for content. The data is heavily fragmented across the SharedFields, UnversionedFields, and VersionedFields SQL tables, bound together by 32-character GUIDs. You cannot simply dump the SQL database.

The PowerShell Extraction Method

For enterprise databases (100,000+ items), the absolute most reliable extraction method is utilizing Sitecore PowerShell Extensions (SPE). Your engineering team must write complex PowerShell scripts that execute directly on the Sitecore server.

These scripts recursively traverse the entire Content Tree. For every Item, they extract the standard fields, the Rich Text content, the Media Library references, and the complex relation GUIDs. The script then formats this data into highly normalized JSON or CSV files and writes them directly to the server's hard drive. This bypasses HTTP timeouts and drastically reduces the load on the SQL server compared to querying the Sitecore Item Web API.

Once the JSON or CSV files are extracted, they must be ingested into Drupal. This is where Drupal absolutely outshines every other CMS on the market. The Drupal Migrate API is a world-class, built-in Extract, Transform, Load (ETL) pipeline.

The ETL Pipeline Process

1. Extract (Source Plugins): You configure a Drupal Migration configuration (YAML file) to point to your extracted JSON files. The Source plugin reads the data row by row.
2. Transform (Process Plugins): This is the critical step. You cannot push raw Sitecore data into Drupal. You must write custom Process plugins (PHP classes) to transform the data. For example, a custom plugin must parse the incoming Sitecore Rich Text HTML, find legacy Sitecore GUID links (~/link.aspx?_id=...), look up the new Drupal Node ID in a mapping table, and rewrite the HTML link dynamically.
3. Load (Destination Plugins): Once the data is transformed, the Destination plugin securely writes it into Drupal's complex SQL schema, creating Nodes, Paragraphs, or Taxonomy Terms.

Because the Migrate API tracks every single imported item via a map table, you can run the migration iteratively. If a script fails halfway through, you simply fix the bug and restart; Drupal knows exactly where it left off, preventing duplicate data.

Media extraction requires its own dedicated migration script. Images and PDFs stored in the Sitecore Media Library are technically Items as well. The extraction script must compile a list of all media URLs.

During the Drupal ingestion phase, a specific migration is run that reads this list, physically downloads the binary files (images/PDFs) from the legacy Sitecore server via HTTP, saves them to Drupal's public file system (or an S3 bucket via the Flysystem module), and creates corresponding Media Entities in Drupal. The subsequent Node migration then references these newly created Media Entities.

Sitecore's presentation layer (.NET MVC or WebForms) must be entirely discarded. You are moving to a modern ecosystem, which presents a strategic architectural choice for the frontend.

Traditional Drupal (Twig)

In a traditional setup, Drupal renders the HTML using the Twig templating engine. This is significantly lighter and faster than Sitecore's WebForms. With the adoption of Drupal's Layout Builder, marketing teams gain a highly visual, drag-and-drop interface that is far more intuitive and responsive than the Sitecore Experience Editor.

Headless Drupal (Decoupled React/Next.js)

However, the majority of enterprise migrations in 2026 are adopting a Decoupled (Headless) Architecture. In this model, Drupal acts strictly as a backend content repository and API server (exposing data via JSON:API or GraphQL). A separate frontend application, built in Next.js or React, queries this API and renders the website.

This decoupled approach provides massive performance gains (sub-100ms page loads via Static Site Generation), infinitely scalable edge hosting (via Vercel or AWS Amplify), and extreme security (because the CMS database is never directly exposed to the internet). We executed this exact decoupled architecture flawlessly in our Sitecore to Drupal Migration for Indian Bank case study.

A major reason highly regulated industries (like banking and government) choose Drupal over other platforms is its unparalleled security track record.

Drupal features a dedicated, global Security Team. Security advisories (SAs) are highly structured, and patches are released on a predictable schedule. Furthermore, because Drupal is open-source, its core code is constantly audited by thousands of independent security researchers. In contrast, Sitecore relies on "security by obscurity"—if a zero-day vulnerability exists in the proprietary .NET code, you are entirely dependent on Sitecore's internal team to find and patch it.

A successful enterprise migration must result in zero downtime and zero data loss. This is achieved through the Delta Sync strategy.

The initial massive migration of 100,000 items (which may take days to process) is run against a Staging environment. The marketing team continues to use Sitecore in Production. On the night of the launch, the migration scripts are run again, but configured only to fetch items that were created or modified since the initial sync. Because the Drupal Migrate API tracks high-water marks, this Delta Sync takes only minutes. Once the final delta is ingested, the DNS A-records are updated to point to the new Drupal infrastructure, resulting in a seamless transition.

Migrating from Sitecore to Drupal permanently eliminates hundreds of thousands of dollars in annual proprietary licensing fees. Drupal is open-source (GPL) and free to use. While the initial engineering effort of the migration requires capital, the 5-Year Total Cost of Ownership (TCO) is drastically lower.

For a deeper dive into the specific financial metrics underlying this decision, read our exhaustive Sitecore vs Drupal TCO Comparison.

Migrating from Sitecore to Drupal is not just an infrastructure upgrade; it is a strategic business transformation. It liberates the enterprise from restrictive vendor lock-in, slashes the 5-Year TCO by millions of dollars, and provides the marketing team with a modern, agile authoring experience.

However, the execution requires deep architectural expertise. The complexities of Sitecore's fragmented SQL database and the intricacies of the Drupal Migrate API demand a specialized engineering team. If your organization is ready to modernize its digital stack, engage our Enterprise Migration Architecture team to architect your flawless transition.