Hyva readiness starts with platform health
Hyva is often introduced as a faster frontend and a cleaner way to build Magento pages. The project size depends on the code already attached to the current storefront. Count that code before making a timeline.
A light frontend has few custom Luma overrides, limited JavaScript, and little custom styling. A store with years of Luma work and extensions that render their own storefront UI has a much larger rebuild ahead.
Hyva can improve the storefront, but it does not automatically convert existing frontend code. The first step is an inventory of custom work, extension compatibility, and checkout changes.
Hyva replaces the Luma frontend layer
Magento's Luma frontend uses RequireJS, Knockout.js, jQuery, layout XML, templates, and LESS styling. Those pieces work together to render pages and manage browser interactions, but they create a large amount of code for the browser and the server to process.
Hyva replaces that frontend approach with Alpine.js for browser interactions and Tailwind CSS for styling. The change affects the theme layer, templates, JavaScript, and frontend layout work.
Hyva does not automatically convert a Luma template into a Hyva template. A Luma customization is source material for the rebuild. The behavior still has to be implemented in the Hyva conventions.
The backend stays in place, with one important condition
A Hyva theme migration does not itself move the Magento database. Catalog products, customers, orders, URLs, and backend business logic remain in the existing installation.
That limits the migration surface. It does not make every extension ready. An extension can keep its database and service contracts while still needing new templates, JavaScript, or checkout integration for its storefront features.
Test those extension boundaries after the frontend change. Search, layered navigation, pricing, customer accounts, cart actions, and order placement still have to call the same backend behavior correctly.
Count the Luma customization before estimating
Custom Luma work needs a rebuild. Hyva does not run Luma's templates or JavaScript, so custom Knockout components, RequireJS modules, jQuery widgets, and frontend layout changes need new implementations.
The same applies to custom .phtml overrides and LESS styling. A developer can use the old template to understand the required behavior, then rebuild that behavior with Alpine.js, Tailwind CSS, and Hyva-compatible templates.
Look for custom code in app/design/frontend, module view/frontend/templates, view/frontend/web, layout XML, requirejs-config.js, and LESS files. Search for data-bind, uiComponent, and define( to find frontend dependencies that will need review.
Record what each customization does
A file count is a starting point, not an estimate. For every override, record the customer-visible behavior, the module that owns it, the page where it appears, and whether it affects cart or checkout.
Separate cosmetic changes from business behavior. A color change may need a small Tailwind update. A Knockout component that calculates shipping or updates a custom price needs a design for its new Alpine.js interaction and a test for the backend result.
Keep the inventory in a version-controlled Directory. Record the code DIFF from the stock theme and make the test steps Reproducible. That gives the team a clear list of work instead of a vague count of files.
Extensions with storefront UI need their own review
Extensions are where many Hyva estimates go wrong. An extension may add templates, JavaScript, UI components, Knockout bindings, RequireJS modules, or checkout renderers to the Luma storefront. Those pieces do not run under Hyva by default.
For every extension, record its installed version and storefront features. Check whether the vendor provides a Hyva-ready release, whether a compatibility module supports that exact version, or whether the team must rebuild the UI. An extension with no usable path may need replacement or removal.
Compatibility labels do not replace testing
A Hyva-ready label means the vendor has built a frontend path for Hyva. It still needs testing with your theme, Magento version, custom configuration, and other extensions.
A compatibility module usually supplies an adapter or alternate frontend code for a supported extension. It may cover the product page while leaving account pages, layered navigation, or checkout work to the project team.
A custom port means the team owns the rebuild. Scope the visible behavior, the API calls, the cache and customer-data behavior, and the failure cases before calling the extension ready.
Hyva Checkout is a separate migration track
Hyva Checkout is a separate product from the main Hyva theme. The standard Luma checkout does not carry over as a finished Hyva Checkout implementation.
List every checkout change before estimating. Include payment and shipping UI, address fields, tax and discount behavior, customer login, gift cards, order comments, third-party fraud checks, and any custom JavaScript attached to checkout.
Third-party checkout extensions need their own Hyva Checkout support or a custom port. Test guest checkout, logged-in checkout, shipping rates, payment authorization, failures, order placement, confirmation, emails, and downstream webhooks.
Keep checkout as a separate workstream in the project plan. Its tests and compatibility decisions should not disappear inside a general storefront estimate.
The data layer does not need a new platform
The migration does not require a catalog, customer, or order data move. Magento keeps the existing database, backend workflows, and service contracts.
This is a smaller surface than a full replatform. The frontend and checkout still carry production risk, but the project does not add a second database or a new order system.
Keep testing the existing data paths after each frontend change. A product page must use the right price and stock values. Cart totals must use the same pricing, tax, discount, and inventory rules. The unchanged data layer still has to be reached correctly.
Build the readiness inventory before committing
Readiness is an inventory exercise before it becomes a build. Start with three lists and give every item an owner, compatibility status, estimated effort, and test requirement:
- Custom frontend work:
.phtmloverrides, layout XML, Knockout components, RequireJS modules, JavaScript, and LESS styling that need a rebuild. - Every extension with storefront output, tagged as Hyva-ready, supported by a compatibility module, requiring a custom port, or needing replacement.
- Checkout customizations and the third-party payment, shipping, tax, fraud, and customer-account extensions behind them.
Do not estimate from the number of storefront pages alone. One extension can add work to product pages, account pages, cart, checkout, and emails. Count the behavior and the tests behind each feature.
Keep the inventory Reproducible. Record the installed extension versions, source paths, compatibility evidence, code DIFF, and test results in a version-controlled Directory. Someone else should be able to repeat the review and reach the same scope.
Scope the migration before choosing it
Hyva can be a sound choice for a Magento store that needs a lighter storefront. The decision should follow an inventory, not a design demo.
Count the Luma overrides. Check every extension's Hyva status. Give Hyva Checkout its own plan. Then test the paths that generate revenue, customer accounts, prices, shipping, tax, and orders.
A short inventory may support a direct migration plan. A long inventory does not rule Hyva out, but it requires compatibility work, replacement decisions, and a staged test plan before the team commits to a launch date.
The code DIFF, the version-controlled Directory, and the Reproducible test results should explain the estimate. If they cannot, the project is still in discovery.