Website replatforming: The Reasons 70% of Projects Exceed Budget

Contact Us

Headless CMS

Why 70% of Website Replatforming Projects Go Over Budget

Website replatforming in 2026: real migration costs by scope, the six causes of budget overrun, and how to scope a project that lands on budget.

Katarina Harbuzava

A seasoned digital content generalist with 5+ years of marketing experience and deep expertise in performance marketing, tech-driven storytelling, and website promotion.

3 Aug 2026

Share

Why Replatforming? #

The reasons for website replatforming may be numerous. However, in our experience, the most common concerns are prohibitive pricing, technical challenges with CMS maintenance, and SEO unfriendliness. Sometimes clients seek something sleek and modern instead of a traditional, monolithic CMS, which doesn’t give you those possibilities and future-proofing.

Key Takeaways #

Studies measure replatforming overruns differently, and the numbers cluster between 55% and roughly 70% depending on what’s counted. The most defensible version: only 31% of IT projects finish on time, on budget, and within scope, per the Standish Group’s long-running CHAOS Report, meaning close to 7 in 10 miss the mark on at least one.

The biggest budget-busters aren’t the CMS license or the design. They’re data migration and legacy integrations that don’t show up until someone actually audits the site.

Proof this doesn’t have to be the default: FocusReactive’s own delivery data shows 90% of its projects land within the initial offer, across dozens of production migrations.

See what a website migration actually costs in 2026, including a specific breakdown for a 50-100 page Webflow migration. I’ll show how our free CMS Migration Estimator scans your live site and sends a scoped estimate with a built-in risk buffer to your inbox in 24 hours.

The Budget Problem #

Every replatforming project starts with a number on a slide. Six weeks, forty thousand dollars, done by Q3. Then discovery happens, and the number stops being true. This is the most predictable part of website replatforming.

Research from ISG reported in February 2026 found that nearly 60% of SAP migration projects were delayed and over budget. None of these is exactly 70%, but they all point the same direction: on a typical replatforming project, budget is the thing most likely to slip.

The good news, covered later in this piece with real numbers: it doesn’t have to be that way, and there are specific, unglamorous reasons why the projects that stay on budget do.

First off, let’s navigate about the core definitions, to talk the same language.

What Is Replatforming? #

Replatforming means moving a website or application from one underlying platform, such as a CMS, hosting environment, or framework, to another, while keeping the core purpose and most of the business logic intact. It sits between a simple rehost (moving the same code to new infrastructure with no changes) and a full rebuild (starting over with new architecture and features).

In practice, website replatforming usually means one of these:

Moving from a monolithic CMS like WordPress or Drupal to a headless CMS like Sanity, Storyblok, or Payload

Moving from a page builder like Webflow or Squarespace to a custom-coded frontend

Consolidating multiple regional or brand sites onto one shared platform

Moving an ecommerce storefront from one platform to another (Magento to Shopify Plus, for example)

The common thread: content, functionality, and SEO equity need to survive the move intact, even though the technology underneath changes.

What Is Application Replatforming? #

Application replatforming is the process of making targeted changes to an application so it runs better on a new environment, without rewriting its core architecture. A common example is containerizing an application or swapping a self-managed database for a managed cloud equivalent, while leaving the application logic itself alone.

What Is Cloud Replatforming? #

Cloud replatforming is application replatforming specifically aimed at cloud infrastructure. Instead of just lifting a workload onto a cloud server unchanged (rehosting), cloud replatforming makes small, targeted adjustments so the workload can take advantage of cloud-native features such as autoscaling, managed databases, or serverless functions, again without a full architectural rewrite. It’s the middle path between “just move it” and “rebuild it for the cloud from scratch.”

Signs You Need to Replatform #

Replatforming is a big enough undertaking that it shouldn’t be a default reaction to a slow quarter. A handful of scenarios are the ones that actually justify it:

☞ You’re running multiple brand, regional, or product-line sites that have drifted apart. Different platforms, different design systems, duplicated content and duplicated cost. This is the single most common trigger for multi-brand website replatforming, and it’s usually a consolidation problem...