Definition
A big bang migration is an approach where the entire site is rebuilt and launched in a single cutover.
What is a big bang migration?
A big bang migration is an approach where the entire site is rebuilt and launched in a single cutover. The old site goes offline, the new Webflow site goes live, and all redirects activate at once.
This is the most common approach for small-to-mid-size sites (up to around 150 pages). It's faster to execute, simpler to QA, and avoids the complexity of running two versions of a site simultaneously. The tradeoff is risk concentration: if something goes wrong - a missing redirect, a broken integration, a CMS configuration issue - it affects the entire site at once.
We typically recommend big bang migrations when the site is under 200 pages, the content structure isn't changing dramatically, and the team has capacity to do a thorough pre-launch QA. The risk is manageable with a solid staging environment and a clear go/no-go checklist.
Go deeper: How long does a Webflow migration take?, How to migrate to Webflow without losing SEO?
