SharePoint Online really only has two primary site types — Team Sites and Communication Sites — and picking the wrong one early means a rebuild later, not a quick setting change.
In this post: Team Sites · Communication Sites · Beyond the two types · Why the rebuild warning is real · Permissions work differently between the two · When would you actually use this?
Team Sites
Microsoft 365 Group-connected, built for collaborative teamwork — document sharing, shared calendars, task planners, discussion boards. Best for teams working on shared projects on an ongoing basis, usually linked with Microsoft Teams for communication.
There’s a lesser-known variant worth knowing about: a Team Site without a Microsoft 365 Group, available from the SharePoint admin center’s site-creation flow. It skips the group entirely — no shared mailbox, no Teams-connectable calendar, no group-based membership — and relies purely on classic SharePoint permission groups instead. Admins reach for this when they want the Team Site layout and permission model, but don’t want the group sprawl that comes from every project spinning up its own mailbox, calendar, and Planner board.
Communication Sites
Built for organization-wide, one-to-many communication — company news, HR updates, leadership announcements, policy publishing. Functions as an internal intranet page rather than a workspace. Communication Sites come with three starting templates, and the choice mostly affects the default layout, not the underlying capability:
- Topic: a general-purpose landing page with a hero section, news, and highlighted content — the default choice for most department or announcement sites.
- Showcase: image-forward, built for visually presenting a product, project, or event rather than dense text content.
- Blank: no pre-built sections at all — start from an empty canvas if neither of the above layouts fits.
All three are fully editable afterward with the same web parts — the template just decides what’s already on the page when you land on it for the first time.
Team Sites are for ongoing collaboration; Communication Sites are for broadcasting to an audience that isn’t editing alongside you. Picking based on that distinction, not habit, avoids a rebuild later.
Beyond the two types
- Hub Sites connect multiple Team/Communication Sites under unified navigation, branding, and governance — not a third site type, a way of organizing the other two. See Understanding SharePoint Hub Sites.
- Document Center / Records Center — specialized Team Site configurations for advanced document management and compliance.
- Enterprise Wiki — a knowledge-base feature layered onto either site type.
Why the “rebuild” warning is real
There’s no supported direct conversion between a Team Site and a Communication Site — Microsoft doesn’t offer a switch because the two are architecturally different (Team Sites are tied to a Microsoft 365 Group; Communication Sites aren’t). If you pick wrong, the actual fix is creating a new site of the correct type and migrating content into it, optionally swapping URLs afterward. That’s a real project, not a settings change, which is exactly why it’s worth spending five minutes on this decision upfront.
Permissions work differently between the two
A group-connected Team Site inherits its membership from the Microsoft 365 Group — add someone to the group (via Outlook, Teams, or the SharePoint member list, they’re all the same underlying group) and they get site access automatically, at the Owner/Member/Visitor level the group maps to. A Communication Site has no group backing it by default, so permissions are assigned directly through SharePoint groups (Owners, Members, Visitors as plain SharePoint permission levels, not synced to anything else). Practically: Team Site membership changes propagate from wherever people manage the group; Communication Site membership only changes where someone edits SharePoint permissions directly. Mixing up which one you’re editing is a common source of “I added them but they still can’t see it.”
When would you actually use this?
- A new project team needs a shared workspace — Team Site, connected to Teams.
- Leadership wants a place to publish company-wide updates that most people only read, not edit — Communication Site.
- Several related sites need consistent branding and cross-site navigation — neither type alone does this; that’s what Hub Sites are for.
Give that a try and let me know how it goes in the comments.
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