All Squarespace sites on an annual billing plan include one free custom domain. Your domain is free for the first year, starting from the date it's registered.
Note: If you’ve already registered a domain with one of these TLDs through a trial site or parking page, you’ll see a credit for your domain purchase when you upgrade to an annual billing plan.
The following TLDs are available for free registration:
When you register your free domain, you can purchase additional domains at the same time for $20 to $70 each.
Note: After the first year of domain service, your domain will renew at the standard annual rate. This policy applies to eligible domains linked to sites created on or after March 5, 2015.