Should you migrate everything at once or in phases?
- Published November 6, 2026
- Linked from 1 answer
- In a cluster of 7
All at once for small and medium sites, in sections for large ones. Google’s guide to moving a site with URL changes gives that split: “Small or medium sites: We recommend moving all URLs on your site simultaneously instead of moving one section at a time.” It explains that a single move helps users find their way in the new site and helps Google detect the move and update its index faster. For large sites it allows moving one section at a time.
How the two approaches compare
| All at once | In sections | |
|---|---|---|
| Fits | Small and medium sites, per Google | Large sites, where a single cutover is too big to test |
| Mixed state | Short; old and new coexist only briefly | Long; parts of the site sit on old URLs while others have moved |
| Detection by Google | Faster, per Google's guide | Slower, since the move arrives in pieces |
| Risk if something breaks | Everything is exposed at once | A mistake is contained to one section |
| Redirect and linking work | One complete map, applied once | Maps per section, plus internal links that must work across old and new parts |
The trade is between a short, concentrated risk and a long, contained one. For a site small enough to test fully before launch, the short risk is the better bargain, which is why Google recommends it. For a site with hundreds of thousands of URLs, testing the whole map in one go may not be realistic, and moving a section first lets you see how Google handles it before committing the rest.
If you move in sections
Start with a section that is representative but not one of your highest-value areas, so problems show up on pages you can afford to lose for a while. Google’s guide describes this pattern: move part of the site first, then move the rest all at once or in further chunks. Between phases, check how the moved section is crawled and indexed, fix what the first phase revealed, and apply it to the next.
Whichever route you take, the redirect map is what decides the outcome; the other failure points are listed in what breaks rankings first in a site migration. Choose by size, and do not phase a small site in the hope of reducing risk; it lengthens the period of mixed signals without a matching benefit.
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