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Recently I got into a position where I need to see a trade off of creating a Subsite in SharePoint. I would like to know what are all the scenario that we need to create a new Sub Site and why ?

Example :

  1. To have a different level of security compared to other sites.
  2. To have a different master page
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migrated from stackoverflow.com Sep 15 '11 at 22:11

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5 Answers

up vote 8 down vote accepted

Subsites are incredibly useful in all the following scenarios

  • This site has a different function from the main site.

Assuming you are talking about an internal portal, generally you would want your helpdesk and your social committees to have their own subsite each. Because their information will almost never be relevant to each other, and they are both not commonly used.

  • The site has a different target audience from the main site.

You could have a portal for all the interns to look at. It isn't private, it doesn't have a separate permissions system, but it has all the "Getting Started at XYZ corporation" stuff, and it has the various training handouts and other information all put in one small place.

  • The site has information which is not needed elsewhere.

It is very helpful to classify all your information, and usually desirable to split it up as much as possible. If you have weekly status meetings, and someone creates and agenda, and there are minutes, and there are attendances and etc... then you can create a subsite to house only the information that relates to those meetings. You can then add a calendar and etc to it. That way, anyone wondering about the meetings need only go to the "Weekly Meeting" subsite, and all the information is laid out and tailored.


In general, you want to use subsites whenever there is a division of information. I would suggest that you fight against the urge to do most things in the root. In fact, I've often seen the root site mostly contain links to all the subsites. Because it is simpler to go to an area that is DEDICATED to the particular information that you need, rather than slog through the tons of information that would be stuck in the root.

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Here are some popular blog posts I wrote in the past:

SharePoint Site Topology Planning

Site Topology Planing and Taxonomies

I believe they are still helpful and relevant.

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For when one site has different business rules than another site.

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Another reason is when you need to have separate lists or document libraries that are specific to a site. If you create pages, all the pages have to use the parent site list collections. If you need "sites" to have their own collections or lists, sub sites will do that.

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One obvious reason would be localization. If you have a site called Sample, you create a English subsite and further a US subsite under English. Now if you need to use all the content from Sample and English for a Canadian site, you could create a "CA" site under English. That is how Microsoft sites are built currently.

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