Microsoft 365 atWork

Prevent SharePoint Online subsites creation

  1. Turn on/off SharePoint site creation Self Service
  2. Prevent SharePoint Online subsites creation
  3. How to create and share SharePoint Modern Team Site
  4. How to create and share SharePoint Communication Site
  5. How to create SharePoint Hub site
  6. How to rename SharePoint Online site
  7. Modernize SharePoint Online root site
  8. How to fix SharePoint performance issues

SharePoint on Office 365 changed totally the way how sites structure should be organized. One of the key decisions you have to make is the way how you want to organize the site structure.

Analyze available options and decide which model will fit the best to your organization.

Why should I prevent SharePoint subsite creation?

Title of this article already suggests that you should prevent SharePoint subsite creation, but why?

I can imagine that you have strong experience in SharePoint Server working on-premise. Data structure stored on classic SharePoint platforms were focused on multilevel subsite hierarchies. Buidling that kind of structure were very quick but also extremaly difficult in maitanance. This model is past and will be limited.

The answer to this question is the flat architecture of sites which is Office 365 required model.

Flat sites architecture

In Office 365 all SharePoint sites that are created by default as Modern sites, like:

These sites by default do not allow you to create subsites. If you allow subsites creation on Modern sites you will be able to do that, but created subsites will be in Classic mode. There will not be possible to “switch” them to Modern functionality.

The architecture of SharePoint service on Office 365 is based on separated Modern sites. Thanks to that:

In SharePoint Administration Center Preview Mode you can easily get all necessary information about sites owners and sites usage.

Thanks to flat sites architecture you will not have to dig in the site hireachy to analyze the site. You will have just one site with simple ownership.

The final report that will contain all Modern sites will give you clear information about the environment.

What options I have to manage subsite creation?

You have three options available options:

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I highly recommend considering turning off subsite creation globally by using option: Hide the Subsite command. If you using also Classic SharePoint sites in your organization you use such change to start moving your colleagues from Classic to Modern SharePoint sites

In cases where you have huge ammount of Classic SharePoint sites on Office 365 which are heavly used you should limit creation of subsites only to Classic sites by choosing: Show the Subsite command only for classic sites.

What about sites hierarchy?

I can’t imagine the situation when sites hierarchy will not exist at all on your sites. You should use Hub sites in cases when you want to connect multiple sites to one portal like:

with unified navigation and automatic summary of published information.

Hub sites allow you to connect multiple sites in one manageable structure without using subsites.


How to manage SharePoint subsites creation

In the first step, you will need to is log in to Office 365

1. Open Office 365

Open Office 365 site using address. In Office site choose Admin button.

2. Open SharePoint Administration Center

When you will open Admin site choose Admin centers (1) and then SharePoint Admin Center (2).

3. Open SharePoint Settings

In SharePoint Admin Center choose Settings (1) tab.

3. Set Subsite Creation setting

You have to find the option called Subsite Creation. You will have to available options:



When the change will appear for the users?

Changes could be visible for the users after 5-15 minutes because of the caching services on the server and browser side.

Is it possible to make an exception for this setting?

No. This is global setting set for all sites.

Can I change the setting in  Preview version of SharePoint Admin Center?

It is not yet possible (verified at Q4 2018).

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