Technical SEO migration services

What this covers that a general SEO audit does not

A standard technical audit answers “is this site healthy?”. Technical SEO migration services answer a different and much narrower question: “will this specific set of URLs, signals and behaviors survive being replaced?”

That difference changes the method. An audit samples. Migration work does not — it works from the complete indexable URL inventory, because the URL that breaks is never the one you sampled. It also works in pairs: nothing is assessed on its own merits, only against its counterpart on the other side of the move.

The four things that get verified

1. Redirects resolve in one hop to a relevant destination

Not “redirect rules exist”. Not “the pattern covers that directory”. Each priority URL is tested individually against the target environment, and the result recorded as a final status code plus a hop count.

Chains are the most common finding, and they are almost always accidental — a rule that normalizes trailing slashes runs after a rule that maps old paths, so every legacy URL takes two hops instead of one. Nobody wrote that on purpose. It shows up in five minutes of testing and is invisible otherwise.

2. The new site presents the same signals as the old one

The parity diff compares titles, H1s, canonicals, meta robots, word counts, internal link counts, structured data types and hreflang annotations across every matched URL pair.

Most of the differences it finds are intended. The value is in the ones that are not: a template that lost its canonical tag, a section where internal link counts dropped by 80% because a sidebar module was cut, a set of pages whose word count halved because a tab component now loads its content on click.

3. Content exists in the HTML, not just in the DOM

When a site moves to a JavaScript framework, body copy, internal links and canonical tags can move out of the initial HTML response. Google will usually render the page eventually, but rendering is queued and not guaranteed, and links that only appear after hydration are discovered slowly.

The test is unglamorous: fetch the raw HTML and look for the content. If the copy and the internal links are not there, treat discovery as a risk and decide deliberately whether to accept it. Server-side rendering the templates that carry organic traffic is usually cheaper than the alternative.

4. Production matches what was approved

The last check is the one most often skipped, and it catches the most expensive class of failure. Staging environments carry noindex directives. Release pipelines sometimes carry them to production.

A site-wide noindex on launch day can start removing pages within days. It is trivial to check and catastrophic to miss, so it is checked in production immediately after cutover, not inferred from the staging sign-off.

Where this sits in the wider engagement

This page describes the technical scope. It is one part of the full migration engagement, which also covers benchmarking, priority tiering, content decisions and post-launch measurement.

If you are still deciding whether the migration plan is sound at all, the pre-launch audit is the smaller, fixed-scope way to find out. If you want to see the sequencing without talking to anyone, the checklist is published in full, and unfamiliar terms are defined in the glossary.

A note on tooling

The tools matter less than people expect. A crawler, a spreadsheet, Search Console and access to logs cover most of this work. What changes the outcome is method: crawling both environments under the same configuration so the diff is meaningful, testing individual URLs rather than trusting patterns, and having a written gate that someone has to sign before the next phase starts.

Any provider can name the same tools. Ask instead what their parity diff compares, field by field, and what their hop-count budget is. Those answers separate a process from a toolbox.