Theme updates are the trade-off
Shopify themes receive updates — performance improvements, new features, compatibility fixes. A heavily-modified theme cannot take those updates without redoing the modifications.
That is an acceptable trade for genuine requirements and a poor one for cosmetic tinkering. Knowing which is which is the discipline.
Contain the changes
- Custom styles in one file, not scattered through templates
- Custom snippets clearly named and documented
- A written record of every modification and why it was made
- Nothing modified that the theme settings could have achieved
The record matters more than people expect. Three years later, nobody remembers why a template was changed, and that uncertainty makes every future change slower.
Use theme settings first
Modern Shopify themes expose a great deal through settings and sections. A substantial share of the customisation requests we receive are achievable without touching code.
Check the settings thoroughly before commissioning a change. It is free, it survives updates, and your team can adjust it themselves.
Keep business logic out
Pricing rules, integrations and anything that must survive a theme change belong in an app or in Shopify Functions, not in Liquid templates.
A store that changes theme and loses its bundle pricing has paid for that logic twice, which is entirely avoidable.
Test on a duplicate
- Duplicate the theme before making changes
- Make and test the changes on the duplicate
- Check product, collection, cart and mobile specifically
- Publish when it is right, keeping the previous version
- Verify the live store after publishing