Upgrade Joomla 3 to Joomla 6 — Complete Migration Service
Joomla 3 has been end of life since August 2023 — over two and a half years without a single security patch. Joomla 6 is the current major release, launched in October 2025, with version 6.0.4 already available and Joomla 6.1 arriving in April 2026. If you want your website on the latest, most capable version of Joomla, this is the migration path.
Migrating from Joomla 3 to Joomla 6 is the most comprehensive upgrade available. It spans two generations of the platform and requires a carefully managed multi-step process. We handle the full journey — from a decade-old Joomla 3 installation to a modern Joomla 6 website — preserving your content, protecting your search rankings, and ensuring every extension and feature works correctly on the new platform.
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Why Migrate from Joomla 3 to Joomla 6
Every reason to leave Joomla 3 applies to this migration path: the security vulnerabilities are permanent, PHP 7.x hosting is being discontinued, extensions are abandoning Joomla 3 support, and GDPR compliance on unpatched software is legally indefensible. For a detailed breakdown of these risks, see our Joomla 3 to 5 migration page, which covers them comprehensively.
The additional question here is: why choose Joomla 6 over Joomla 5?
Joomla 6 Is the Current Release
Joomla 6.0 was released on 14 October 2025, introducing the next generation of the platform. It builds on the architecture established in Joomla 4 and refined in Joomla 5, adding new developer APIs, performance improvements, and modernised infrastructure. Joomla 6 is not an experimental release — it is the current, actively developed version receiving the most attention from the Joomla development community.
Automatic Core Updates
One of the most significant new features in Joomla 6 (and Joomla 5.4) is support for automatic minor version core updates. For website owners, this means that security patches and bug fixes can be applied automatically without logging into the administrator backend and manually triggering the update process. This is a substantial improvement for maintaining website security with minimal effort.
Modernised Codebase
Joomla 6 is built on Joomla Framework 4, a significantly modernised framework compared to what powers Joomla 5. The framework improvements benefit developers building extensions and templates, resulting in better-performing, more secure extensions over time. For website owners, this translates to a platform that is better positioned for the long term.
The Compatibility Plugin
Joomla 6 ships with a Compatibility Plugin that allows extensions not yet fully updated for Joomla 6 to continue functioning. This is a deliberate bridge feature designed to ease the transition for the extension ecosystem. While the plugin provides valuable compatibility coverage, it does impact performance — websites that can run without the Compatibility Plugin will load faster. As extensions update their codebase for native Joomla 6 support, the plugin can be disabled for improved performance.
When to Choose Joomla 5 Instead
Joomla 5 is the Long Term Support release and remains the more conservative choice. If your website relies on extensions that have not yet confirmed Joomla 6 compatibility, or if your organisation prioritises proven stability over having the latest features, migrating to Joomla 5 may be the better option. We assess extension compatibility during the free site audit and recommend the most appropriate target version based on your specific installation.
The Migration Path: Joomla 3 → 4 → 5.4 → 6
Joomla 3 cannot be upgraded directly to Joomla 6. The migration follows a defined path through intermediate versions, each step handled as part of a single managed project:
Stage 1: Joomla 3.10.x — Pre-Migration Preparation
Your Joomla 3 installation is updated to the latest 3.10.x release (if not already current), all extensions are updated to their final Joomla 3 versions, and the installation is cleaned of unused extensions, temporary files, and database bloat. This preparation ensures the cleanest possible starting point for migration.
Stage 2: Joomla 3 → Joomla 4 — Architecture Bridge
The first major step is migrating from Joomla 3 to Joomla 4. This is the most complex step in the entire process because it crosses the architectural boundary between the legacy Joomla 3 codebase and the modern Joomla 4+ architecture. Core content, users, menus, and categories migrate through this step, but extensions and templates must be replaced with Joomla 4+ compatible versions.
Stage 3: Joomla 4 → Joomla 5.4 — Refinement
Once on Joomla 4, the upgrade to Joomla 5.4 (the LTS release) is performed through the standard Joomla Update component. This is a smoother process than Stage 2 because Joomla 4 and 5 share the same architecture. Extensions compatible with Joomla 4 generally work with Joomla 5, though some require minor updates.
Stage 4: Joomla 5.4 → Joomla 6 — Final Upgrade
The final step upgrades from Joomla 5.4 to Joomla 6. This upgrade is supported through the standard update process. The Compatibility Plugin is enabled automatically to ensure extensions that have not yet been updated for Joomla 6 continue to function. We then test each extension and configure the site for optimal performance.
All four stages are performed on a staging environment. Your live Joomla 3 website continues to operate normally throughout the entire process. The migrated Joomla 6 site goes live only after thorough testing and your approval.
What Changes Between Joomla 3 and Joomla 6
The gap between Joomla 3 and Joomla 6 is the largest possible in the Joomla ecosystem. Virtually every aspect of the platform has been rebuilt.
Framework and Architecture
Joomla 6 runs on Framework 4, a complete rewrite from the framework powering Joomla 3. The codebase is fully namespaced, PSR-compliant, and built for modern PHP 8.2+. The legacy compatibility layers that existed in Joomla 3 have been progressively removed through versions 4, 5, and 6. This results in a cleaner, faster, more secure platform — but it means that no Joomla 3 extension or template code can run on Joomla 6 without being rewritten for the modern architecture.
PHP and Server Requirements
Joomla 3 ran on PHP 5.6 to 7.4. Joomla 6 requires PHP 8.1 at minimum, with PHP 8.2 or 8.3 recommended. MySQL 8.0.13 or MariaDB 10.4 are required (Joomla 3 supported MySQL 5.1+). Apache 2.4+ or Nginx is required. These requirements reflect over a decade of progress in server technology and provide the foundation for substantially better performance and security.
Template System
Joomla 3 used Bootstrap 2 for its template framework. Joomla 6 uses Bootstrap 5 — an entirely different system. Your Joomla 3 template will not work on Joomla 6 under any circumstances. The template must be rebuilt or replaced. This is actually an opportunity: modern Joomla 6 templates are faster, more accessible, more responsive, and easier to customise than anything available in the Joomla 3 era.
Administration Interface
The backend has been completely redesigned across Joomla 4, 5, and 6. The Joomla 6 admin is cleaner, more intuitive, and built with accessibility as a priority. The workflow is different from Joomla 3, but the underlying concepts remain the same. Administrators familiar with Joomla 3 can typically adapt to the new interface within a few days of use.
Core Features Not Available in Joomla 3
- Automatic core updates — security patches applied without manual intervention
- Task scheduler — automate repetitive tasks within Joomla itself
- Guided tours — built-in onboarding for backend users
- Workflow publishing — configurable content approval stages
- Child templates — customise templates safely without losing changes during updates
- Mail templates — customise system emails through the backend
- Improved Web Services API — modern REST API for integrations
- New media manager — folder management, inline editing, improved file handling
- Privacy tools — built-in GDPR consent management and data request handling
- Accessibility improvements — significantly better screen reader support, keyboard navigation, and ARIA implementation throughout the backend and default templates
Extension Compatibility for Joomla 6
Because Joomla 6 is the newest major release, the extension ecosystem is still catching up. The Compatibility Plugin bridges most gaps, but it is important to understand the current landscape.
Well-supported extensions with Joomla 6 compatibility: Akeeba Backup, HikaShop, AcyMailing, RSForm Pro, Kunena, Phoca Gallery, DOCman, JCE Editor, and most major commercial extension providers have released Joomla 6 compatible versions or confirmed compatibility through the Compatibility Plugin.
Extensions still in transition: Some smaller or independent extension developers are still working on Joomla 6 native support. These extensions typically work under the Compatibility Plugin but may not yet have native Joomla 6 releases. Our audit identifies these cases specifically.
Discontinued extensions: A number of extensions that were popular in the Joomla 3 era have been discontinued entirely and have no Joomla 5 or 6 versions. For these, we identify functional alternatives or develop custom replacements as part of the migration project.
We assess every extension on your Joomla 3 site during the free audit and provide a clear compatibility report with our recommendation for each — migrate, replace, or develop a custom alternative.
Our Migration Process
Our process for Joomla 3 to 6 follows the same disciplined methodology as all our migration projects, with additional attention to the multi-step nature of this particular path.
- Free comprehensive site audit — we document every aspect of your Joomla 3 installation and provide a detailed migration plan with a fixed-price quotation
- Staging environment setup — complete copy of your site in a secure development environment
- Pre-migration preparation — update, clean, and prepare the Joomla 3 installation
- Four-stage migration — J3 → J4 → J5.4 → J6, each stage verified before proceeding
- Extension migration — install, configure, and test all Joomla 6 compatible extensions
- Template implementation — new Joomla 6 template matching your brand and design requirements
- SEO preservation — comprehensive URL redirect mapping, metadata transfer, sitemap configuration
- Thorough testing — functional, cross-browser, mobile, performance, and accessibility testing
- Your review and approval — you test the staging site and approve before anything goes live
- Live deployment — carefully scheduled switchover with zero downtime
- 30-day post-migration support — monitoring, adjustments, and issue resolution included
Timeline and Pricing
Joomla 3 to 6 migrations are inherently more complex than Joomla 3 to 5 migrations due to the additional upgrade stages and the newer target platform. Typical timelines range from two to four weeks for standard business websites, with complex installations requiring additional time.
Projects start from €1,500 for standard migrations. Complex sites with custom components, e-commerce, multi-language content, or extensive extension ecosystems are quoted individually based on the audit findings. All quotations are fixed-price — you know the complete cost before work begins.
After the Migration
Once your website is running on Joomla 6, maintaining it becomes significantly easier than maintaining a Joomla 3 installation. Automatic core updates handle security patches without manual intervention. The modern codebase is compatible with current and future PHP versions. Extensions built for Joomla 6 follow modern development standards that result in fewer conflicts and better performance.
To protect your investment and keep your website in optimal condition, we recommend our maintenance plans for ongoing updates, security monitoring, and performance management. Our managed hosting provides the server infrastructure specifically optimised for Joomla 6 performance, with European data centres for GDPR compliance.
Frequently Asked Questions
Is it better to upgrade to Joomla 5 or Joomla 6 from Joomla 3?
Both are excellent choices. Joomla 5 is the Long Term Support release — proven, stable, and with a mature extension ecosystem. Joomla 6 is the latest release with the newest features and the most active development. If stability is your priority, choose Joomla 5. If you want the latest platform and are comfortable with extensions that may still be using the Compatibility Plugin, choose Joomla 6. We assess your specific installation and recommend the most appropriate target.
How does the Joomla 6 Compatibility Plugin work?
The Compatibility Plugin is enabled by default in Joomla 6. It provides backward compatibility for extensions that were built for Joomla 4 or 5 but have not yet been updated for native Joomla 6 support. The plugin allows these extensions to function correctly, but it does add some overhead to page loading. As extensions release native Joomla 6 versions, the plugin can be disabled for better performance.
Can I skip Joomla 4 and 5 and go straight from Joomla 3 to 6?
Not technically — the migration must pass through Joomla 4 and 5.4 as intermediate steps. However, we handle this entire process as a single managed project. You do not need to run Joomla 4 or 5 in production. Your website goes from Joomla 3 directly to Joomla 6 in the staging environment, and the live deployment is to Joomla 6.
Will my SEO rankings be affected?
We implement comprehensive 301 redirect mapping to preserve your search rankings. Every URL on your Joomla 3 site is mapped to its corresponding URL on the Joomla 6 site. Properly executed, this process preserves your search visibility. In many cases, the improved performance and accessibility of Joomla 6 actually leads to improved rankings over time.
What about my website's design?
Your Joomla 3 template cannot be used on Joomla 6 — it must be replaced. This can be seen as an opportunity to modernise your website's design. We can implement a commercial Joomla 6 template, build a custom template matching your brand, or customise the Cassiopeia default template. All template work is included in the migration project scope.
How much does a Joomla 3 to 6 migration cost?
Projects start from €1,500 for standard business websites. The final cost depends on the number of extensions, template complexity, content volume, and any custom development required. We provide a fixed-price quotation after the free site audit — no hidden costs, no hourly surprises.
Start Your Migration to Joomla 6
The first step is understanding exactly what your Joomla 3 site needs. Our free audit examines your installation in detail and delivers a clear migration roadmap within 24 hours — including a compatibility report for every extension, a recommended approach, and a fixed-price quotation.