Magento 1 to Magento 2 Migration in 2026: The Honest Guide

Why migrate now (not later)

Magento 1 reached end-of-life in June 2020. Adobe ships no security patches, and the third-party patch services that filled the gap are winding down. For any store that takes card payments, that is the real problem: PCI DSS Requirement 6 expects vendor-supplied security patches, and an unpatched platform fails it. The longer you stay, the more you spend on custom patching, monitoring, and aging extensions: often more than the migration itself, with none of the upside.

Migration is a rebuild, not an upgrade

There is no in-place upgrade from Magento 1 to 2. The codebase, database schema, theme system, and extension architecture all changed. Treat it as four separate tracks:

Data is the part that automates well. Everything that touches presentation or behaviour is built fresh, which is also the opportunity to drop the dead weight your M1 store accumulated over the years.

Moving the data with the Data Migration Tool

The Data Migration Tool is a Composer-installed CLI that Adobe maintains. Its version must match your Magento 2 version exactly: install the tool for the same release you are migrating to:

composer require magento/data-migration-tool:<your-2.4.x-version>
bin/magento setup:upgrade

It runs in three ordered modes against config files that map M1 tables to M2:

# 1) settings: stores, websites, system config
bin/magento migrate:settings --reset config.xml

# 2) data: catalog, customers, orders, everything else
bin/magento migrate:data --reset config.xml

# 3) delta: replay changes made on M1 during the project
bin/magento migrate:delta config.xml

The tool verifies that table structures line up and logs every discrepancy. Custom M1 tables (from extensions) need explicit mapping or they abort the run: this is where most of the hands-on migration time goes. Plan for iteration: you will run migrate:data against a staging copy several times, fixing mappings, before a clean pass.

Themes, extensions, and custom code

None of your Magento 1 front end carries over. The theme is rebuilt: most teams now go straight to Hyvä for speed rather than Luma. Every extension must be re-sourced as a Magento 2 version (often a new licence) and reconfigured; there is no shim that runs M1 extensions on M2. Custom functionality is rewritten as proper M2 modules: see how to build a Magento 2 module from scratch for the modern structure.

This is the right moment to audit: list every M1 extension and custom tweak, then decide keep, replace, or drop. Stores routinely cut 30-40% of their extensions during migration because the functionality is now native in M2 or simply unused.

Cost and timeline, honestly

Agency quotes for a Magento 1 to Magento 2 migration in 2026 land roughly between $3,800 for a small catalog and $25,000+ for a large, heavily customized store, with most mid-size projects in the middle. Timelines cluster around three months once discovery, the theme rebuild, extension replacement, data passes, QA, and go-live are all counted. The variables that move the number most are catalog size, the number of custom extensions, and how much bespoke checkout or B2B logic exists.

A safe go-live plan

The cutover is where migrations go wrong. A plan that protects orders and SEO:

1. Build and test everything on a Magento 2 staging environment with a full data pass.
2. Freeze M1 customizations; only orders and customers keep flowing.
3. Run migrate:delta to replay the orders and customer changes made on M1 during the build.
4. Ship a 301 redirect map from every M1 URL to its M2 equivalent: product, category, and CMS URLs change format, and skipping this tanks rankings.
5. Cut DNS over during a low-traffic window, keep M1 read-only as a fallback, and watch order flow + search console for 48 hours.