Marketing leaders rarely lose sleep over the decision to leave WordPress.
What keeps them up is the execution: redirect chains that break, rankings that dip, integrations that quietly stop working the week after launch.
Choosing the right partner is where most of that risk actually gets managed, and the criteria for evaluating a WordPress to Webflow migration agency look very different from the criteria for evaluating a general web design shop.
That distinction is easy to overlook because migration and net-new design can look similar from the outside — same platform, similar deliverables, similar-sounding proposals.
But a new build starts from a blank canvas.
A migration starts from a full inventory of every URL, redirect, integration, and structured data element that has to survive the move intact.
Those are different skills, developed by doing migrations specifically, not by building marketing sites from scratch.
The single best predictor of a smooth migration
Marketing teams evaluating agencies for this kind of project should look past the portfolio first and ask about process.
Specifically: does the agency run a documented, deliverable-based audit before any design or build work begins?
That audit should account for every URL on the current site, including orphaned pages that don't show up in the main navigation, every existing redirect, all metadata, and any structured data or third-party integrations that need to be re-platformed.
An agency that treats this step as optional, or folds it informally into "discovery," is the agency most likely to underscope the project — and underscoped work tends to surface as expensive problems after launch rather than manageable ones before it.
SEO continuity is a deliverable, not a hope
Ranking loss is the most common fear marketing teams bring to a migration conversation, and it's a reasonable one.
It's also largely preventable when SEO continuity is scoped as its own workstream from day one rather than handled as a launch-week afterthought.
That means redirect mapping validated well before go-live, metadata reviewed and approved by the marketing team rather than auto-migrated and assumed correct, canonical structure verified, and a defined Search Console validation period after launch.
If an agency's answer to "how do you handle SEO during migration" stops at redirects and metadata, that's worth pushing on further — structured data and post-launch validation are where a lot of avoidable ranking loss actually originates.
Ask about content complexity specifically
A twenty-page brochure site and a two-thousand-page content library with a dozen custom post types are not the same migration, even on the same platform.
Marketing teams should ask any prospective partner about the largest, most structurally complex project they've completed, not just the total number of migrations.
Legacy shortcodes, inconsistent templates, and taxonomies that don't map cleanly to a new CMS structure are exactly the kind of complications that separate an agency with genuine migration depth from one that's done a handful of straightforward projects and is generalizing from that experience.
The finish line is stability, not launch day
Migration risk doesn't end when the new site goes live.
The thirty days after launch are typically when redirect gaps get discovered in Search Console, when CMS edge cases show up under real production traffic, and when integrations that tested fine in staging behave differently in the live environment.
Marketing teams should confirm upfront what post-launch support looks like and whether it's included in the base scope or billed as a separate engagement.
A partner who treats migration as complete at deployment, rather than at confirmed post-launch stability, is scoping the project differently than one built for continuity — and that difference tends to show up exactly when a marketing team can least afford it.
Frequently Asked Questions (FAQs)
Why is a deliverable-based audit necessary before replatforming?
An audit accounts for every URL, existing redirect, orphaned page, and third-party integration that needs to move intact.
Agencies that skip this step or fold it into informal discovery are the ones most likely to underscope the project, resulting in expensive technical problems surfacing after launch.
How can marketing teams prevent SEO ranking loss during a site migration?
SEO continuity must be handled as a dedicated workstream from day one.
Preventing ranking loss requires validating redirect mapping well before go-live, verifying canonical structure, having the marketing team manually review metadata, and defining a strict Search Console validation period to catch post-launch errors.
When is a website migration officially considered complete?
The migration does not end when the new site goes live.
The thirty days after launch are necessary to discover Search Console redirect gaps, monitor integrations in the live environment, and catch CMS edge cases under real traffic.
The true finish line is confirmed post-launch stability, not deployment day.