Website Migration Guide · The Basics

What Are the Different Types of Site Migration?

Site migration is an umbrella term covering several kinds of change. Here are the main types, domain, platform and CMS, HTTP to HTTPS, URL restructure and subdomain, what each involves, and why each needs careful handling.

Updated: July 2026
Written by: Andrew Odgers, Managing Director
Reading time: 7 minutes
The short answer

The main types of site migration are domain migrations, platform and CMS migrations, HTTP to HTTPS migrations, URL restructure migrations and subdomain to root domain migrations. A domain migration moves the site to a new domain name; a platform or CMS migration changes the system that builds it; an HTTP to HTTPS migration moves it to a secure connection; a URL restructure changes how URLs are organised; and a subdomain to root domain migration moves content onto the main domain. Each changes a different aspect of a site, but all need careful SEO handling with mapping and correct redirects.

One term, several changes

The main types, and domain, platform and CMS migrations

The main types of site migration are domain migrations, platform and CMS migrations, HTTP to HTTPS migrations, URL restructure migrations and subdomain to root domain migrations, each changing a different aspect of a site but all needing careful SEO handling. Some change where a site lives, some change how it is built, and some change how its URLs are organised or secured; because each type affects search engines differently, knowing which one you are doing shapes how you plan and execute it. A domain migration is moving a website from one domain name to another, for example after a rebrand, which means every URL changes and search engines must be guided from the old addresses to the new ones with correct redirects. Because the whole address of the site changes, it is one of the more visible migrations and relies heavily on complete, accurate 301 redirects. A platform or CMS migration is moving a site to a different system that builds and manages it, such as from one content management system or ecommerce platform to another, which can change URLs, templates and technical setup. The content may stay similar while the underlying technology and URL structure change, so preserving content, metadata and redirects matters; because the way the site is built changes, careful handling of URLs and on-page elements protects its SEO.

T 01

Domain

New domain name, all URLs move.

T 02

Platform / CMS

New system builds the site.

T 03

HTTPS / URL / subdomain

Addresses change, redirects needed.

HTTPS, URL restructures and subdomains

HTTP to HTTPS, URL restructure and subdomain migrations

An HTTP to HTTPS migration is moving a site to a secure connection, which changes every URL from http to https and so counts as a migration that needs redirects and careful setup even though the content stays the same. It is a common and worthwhile change for security and trust, but because the URLs technically change it still needs proper 301 redirects and updated internal links; because every address changes, an HTTPS move should be treated as a migration and handled carefully. A URL restructure migration changes how a site's URLs are organised, such as new folders or naming, while a subdomain to root domain migration moves content from a subdomain onto the main domain, and both change addresses that search engines have indexed. Each alters where pages live, so each needs URL mapping and correct redirects to preserve rankings; because the URLs change, both are true migrations that rely on careful planning and complete redirects. Whichever type you are facing, the safe path is the same: understand the change, map every URL, and implement correct 301 redirects, then plan and monitor carefully. To go deeper on the overall process, see how to plan a site migration.

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Domain, platform, CMS, HTTPS, URL restructure or subdomain, each type of migration changes something search engines rely on. We identify exactly what is changing, map every URL, set up correct redirects and monitor closely, so the move is handled properly and your rankings are protected.

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Frequently asked

Types of site migration

What are the main types of site migration?
The main types are domain migrations, platform and CMS migrations, HTTP to HTTPS migrations, URL restructure migrations and subdomain to root domain migrations, each changing a different aspect of a site but all needing careful SEO handling. Some change where a site lives, some change how it is built, and some change how its URLs are organised or secured. Because each type affects search engines differently, knowing which one you are doing shapes how you plan and execute it.
What is a domain migration?
A domain migration is moving a website from one domain name to another, for example after a rebrand, which means every URL changes and search engines must be guided from the old addresses to the new ones with correct redirects. Because the whole address of the site changes, it is one of the more visible migrations and relies heavily on complete, accurate 301 redirects. Because all the URLs move, careful mapping and redirects are essential to carry rankings across.
What is a platform or CMS migration?
A platform or CMS migration is moving a site to a different system that builds and manages it, such as from one content management system or ecommerce platform to another, which can change URLs, templates and technical setup. The content may stay similar while the underlying technology and URL structure change, so preserving content, metadata and redirects matters. Because the way the site is built changes, careful handling of URLs and on-page elements protects its SEO.
What is an HTTP to HTTPS migration?
An HTTP to HTTPS migration is moving a site to a secure connection, which changes every URL from http to https and so counts as a migration that needs redirects and careful setup even though the content stays the same. It is a common and worthwhile change for security and trust, but because the URLs technically change it still needs proper 301 redirects and updated internal links. Because every address changes, an HTTPS move should be treated as a migration and handled carefully.
What are URL restructure and subdomain migrations?
A URL restructure migration changes how a site's URLs are organised, such as new folders or naming, while a subdomain to root domain migration moves content from a subdomain onto the main domain, and both change addresses that search engines have indexed. Each alters where pages live, so each needs URL mapping and correct redirects to preserve rankings. Because the URLs change, both are true migrations that rely on careful planning and complete redirects.