These days I got phoned up by a buddy who asked how on earth he could programmatically produce a web site collection in 2010 mode in SharePoint 2013. Why he wanted to do this I’m not confident, and it is not the point of this post

It’s truly pretty uncomplicated if you appear at the documentation of some of the SPSiteCollection.Add() strategies which take an int as a compabilityLevel parameter. Passing in 14 in this parameter will make certain you get the 2010 appear and really feel. For reference the SPSite.SelfServiceCreateSite() technique has equivalent overloads.

SPWebApplication webApp = new SPSite(<a href="http://host/">http://host</a>).WebApplication;
SPSiteCollection siteCollections = webApp.Sites;
uint lcid = 1033;
int compatLevel = 14;
string webTemplate = "STS#0";
SPSite newSiteCollection = siteCollections.Add("sites/test", "Title", "Description", 1033, compatLevel, webTemplate,
 "DOMAIN\\User", "Name", "Email_Address", "DOMAIN\\User", "Name", "Email_Address");

If you want to do it I PowerShell you can use the following command:

New-SPSite -Url http://host/sites/test -OwnerAlias "DOMAIN\User"

And via Central Admin:

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