A builder subdomain can be a reasonable way to publish a first website. As the business grows, its own domain can make the address easier to carry across signs, profiles, email, and future platforms.
Separate the address from the builder
The domain is the public address; the builder or host is where the site runs. Owning the address adds flexibility only when registration, renewal, DNS access, and recovery information are under clear control.
Choose a name for continuity
Use a domain customers can read, say, and type. Check spelling and business-name consistency before printing it. A custom domain does not guarantee trust or search visibility; it creates a stable address the business can manage.
Plan email and forms together
Document mail records before changing DNS. Test incoming and outgoing mail, forms, and account recovery afterward. A website move should not disconnect the inbox receiving leads.
Preserve old paths
Map important old URLs to relevant new pages and use permanent redirects when possible. Update internal links, profiles, citations, ads, and printed materials. Google recommends changing one major thing at a time and monitoring the move.
Keep expectations realistic
Search systems may need time to recrawl a move, and no domain guarantees rankings. The practical win is control: a business-owned address, documented renewals, and a site that can evolve.