How to Change Your Internal (Built-In) Domain in Squarespace
If you’ve ever noticed a strange-looking URL tied to your Squarespace site (something like your-site-name.squarespace.com), that’s your built-in domain, also called your Site ID. Most site owners never need to touch this. But in some cases, changing it can be useful, especially during early setup, rebrands, or cleanup work before launch.
Below is a quick explanation of what it is, why you might change it, and how to do it safely.
TL;DR
You can change your Squarespace Site ID by going to Settings → Domains & Email → Domains, clicking your built-in domain, editing the Site ID, and saving. Do this early, and only if you know why you need it.
What Is the Squarespace Built-In Domain?
Every Squarespace site automatically gets a built-in domain when it’s created. This is mainly used:
Internally by Squarespace
For system links, previews, and some integrations
As a fallback if no custom domain is connected
It’s not meant to be your public-facing URL, but it can still show up behind the scenes or in edge cases.
Why You Might Want to Change It
Changing your internal domain can make sense if:
You’re rebranding and want cleaner internal references
You duplicated a site and want to avoid confusing IDs
You’re doing early-stage setup before SEO or integrations
You want internal consistency for testing or staging
You want to make sure your site is branded from top to bottom
How to Change Your Internal Domain (Site ID)
Open your Squarespace website
Click Settings (gear icon)
Go to Domains & Email
Click Domains
Find Built-In Domains and select your built-in domain
Under Site ID, edit the value
Click Save
That’s it. The change is instant.
Need Help With Squarespace Setup or Cleanup?
If you’re not sure whether changing your internal domain is the right move, or you want a pro to handle setup, SEO, or custom code the right way, we can help.
Reach out and let’s make sure your Squarespace site is set up cleanly, correctly, and with zero surprises later on.
