Why Website Migration Timelines Vary So Much

People are often surprised by how different one website migration timeline can look from another. A lot of it comes down to the type of migration - whether you’re just switching hosts or doing a complete overhaul from one platform to another. Through managing migrations for clients with everything from simple small businesses to complex multi-site platforms, I’ve seen timelines range from just half an hour up to several months. I want to dig into real experiences to show how planning, site complexity, and edge cases shape these timelines in practice.

Real-World Timelines: Beyond the "Just Copy the Files" Myth

A common misconception is that migrations are as simple as copying files over from one server to another. It sounds logical, but that’s rarely the reality - especially when you’re moving between platforms like Wix and WordPress. For clients staying within the same technology stack (for example, moving their WordPress site from one host to another), migrations can be very quick. We’ve done straightforward hosting moves where everything wrapped up in about 30 minutes. However, when the project goes beyond a simple host change, things can become much more involved.

Migrating Eight Sites to New Hosting

Let’s take a recent example. We had a client with eight separate sites that all needed to move to different hosting providers. At first glance, this might sound like a cut-and-dry process, but the timeline tells another story:

  • Planning Phase: Took about one week. Most time was spent getting everyone on the same page across all sites, ensuring records were up to date, and making sure we fully understood custom elements on each site. Everyone needed to align on downtime tolerances, technical needs, and migration order.
  • Migration Execution: The actual transfer was pretty quick - about two days for all eight sites. But midway through, we discovered an unknown custom feature on one site that broke in the new environment. This required a developer to recode it so it would work again. The unexpected is always a risk.

This example is a good reminder that even what seems like a technical, logistical job hinges on solid planning and stakeholder involvement. Most delays creep in not during "file moving" but during the research, meetings, and discovery ahead of time.

Major Platform Changes: A Different Ballgame

Migrating from one type of CMS to another (Wix to WordPress, or Squarespace to Shopify for example) is a much bigger undertaking. For one, many platforms don’t give you raw files to export. Moving from Wix to WordPress, for example, means essentially rebuilding the site from scratch. We’ve managed migrations like these that stretched over several months. Here’s why:

  • There’s an extensive planning stage just to map out what can be transferred and what needs to be rebuilt.
  • We often need multiple rounds of recoding, especially if the original site had custom functionalities that don’t exist in the new platform.
  • Website design and content layout must often be recreated or adapted due to platform constraints.
  • Every piece of content (blog posts, product pages, forms) needs to be thoroughly checked and tested in the new environment.

It’s almost never just an export-import job; it’s a process of careful recreation and troubleshooting. The planning itself can take a month or more before any technical move even begins.

Edge Cases and Unexpected Delays

The most common source of delays are edge cases: complex site architectures, legacy technologies, or custom features. These must be fully understood beforehand, because they’re what tends to break in a new environment. We’ve had situations where a seemingly basic website hid custom integrations or legacy plugins that weren’t apparent until migration day. The more unique the build, the more research and custom work will be required—sometimes with no way to predict the scope until you’re deep into assessment.

The True Bottleneck: Planning and Communication

I’d say, based on experience, that planning is almost always the slowest part. The actual data transfer, once you’re ready, is often routine - especially for host-to-host moves. But planning demands multiple meetings with stakeholders, compiling documentation, and mapping out all systems involved. This is necessary not just for logistics, but so everyone is clear about what to expect. The projects that hit delays usually do so because something was missed here, leading to last-minute surprises.

Estimating Website Migration Timelines: Art, Not Science

While you can estimate durations based on prior experience, migrations remain a moving target. Simple host migrations can sometimes be clocked down to a half hour per site. But when you’re changing platforms or managing complex business requirements, the timeline stretches to 1 to 2 months on average - sometimes longer.

The best approach is to be up front about this uncertainty with teams and clients. Build in extra buffer time, and stress that the more custom or less standardized the current site, the more likely you’ll face unexpected hurdles.

The SEO Factor: Timeline Details You Can’t Ignore

Clients with existing SEO rankings can’t afford slipups. The site has to remain as close as possible to the original in both design and, critically, in URL structure. One of the easiest things to overlook is how URLs get handled, especially when moving to WordPress from other platforms. For example, WordPress typically requires URLs to end with a slash, while some platforms don’t. WP is flexible and often handles mismatches, but we still need a solid redirect strategy (usually involving a redirect plugin) to preserve SEO.

I’ve also dealt with platforms that use long or unusual URL structures not directly compatible with WP. If these aren’t anticipated and handled up front, you risk broken links and drops in ranking after launch. The more complex the site’s structure, the more crucial it is to plan your redirects, test them meticulously, and avoid surprises.

If you're migrating to a new URL completely, well then making sure redirects are set is even more important. We usually say that you should expect at least a 20% drop in traffic when migrating to a new domain.