Changing the theme on a HubSpot site that already has a few hundred pages feels risky, mostly because people picture flipping one switch and watching the whole site change at once. You don't have to do it that way. With a bit of planning you can rebuild everything in the background while your current site stays exactly as it is, then go live in one clean step.
This guide covers three ways to change your HubSpot theme, when each one makes sense, and the steps to do it without taking your site offline or losing your search rankings. It applies whether you are moving to one of our themes or any other HubSpot CMS theme.
Short answer: only if you want to change the theme's code. A marketplace theme installs as read-only, so if you need custom modules, new templates, or layouts the built-in modules don't cover, you clone it in Design Manager to get a copy you can edit.
If you are mainly applying your branding and rewriting copy, you don't need to clone anything. The look and feel is controlled from the theme settings, and copy is edited on each page in the editor. Most theme changes fall into this second group, so don't clone out of habit. It just leaves you maintaining a separate copy for no reason.
This is the approach I use most for a full redesign where the copy is changing too. It is simple, it is safe, and it works on any HubSpot tier.
The nice thing here is you control the pace. You can switch a handful of pages at a time and check each one, or hold everything as drafts and publish them all on your launch day. For a site of a couple hundred pages with a fixed go-live date, this is usually the cleanest path.
HubSpot has a built-in tool made for exactly this job. You find it under Settings, Website, Pages, Content Staging.
Content Staging lets you redesign your existing website pages in a separate staging area while the live versions keep running untouched. You rebuild and rewrite as many pages as you want, then publish them all together in one move when you are ready. It is a good fit when you are redesigning a lot of existing website pages and want them to go live at the same moment.
The thing to know is that Content Staging is for website pages. Landing pages and blog posts are handled outside of it, so if your site is a mix you will still use the draft-and-swap method for those parts. Many migrations end up using Content Staging for the main site pages and drafts for everything else.
If you are not rewriting much and you just want existing pages on the new theme, you can change the template on a page directly from its settings, without creating a new page at all. The URL, the analytics history, and the page stay the same. You point it at the new theme's template and then tidy up the content.
This is the fastest option for a smaller site or for pages that are staying largely the same. The trade-off is that you are editing live pages, and modules from the old theme don't always map one to one onto the new theme, so you need to check each page after the swap. For a big redesign with new copy, the draft-and-swap approach gives you more room to work without that pressure.
You can mix them. A real migration often uses Content Staging or drafts for the main pages, the in-place swap for a few simple ones, and a blog template update at the end.
Because you built everything ahead of time, launch day is mostly publishing and checking, not building.
All of the above assumes you have picked a theme you actually want to live with for the next few years. If you are still deciding, our themes are built so the styling lives in the theme settings and the copy stays editable per page, which is what makes a migration like this straightforward. You can see them on the demo site and read the documentation to see how the settings and modules work before you commit.
However you do it, the rule is the same: build in the background, keep the live site running, and switch over once everything is ready.