How to Restrict SharePoint Designer Access at Site Collection in SharePoint 2010

The following Restrictions for SharePoint Designer usage can be applied to SharePoint 2010 Site.

• Allow Site Owners and Designers to use SharePoint Designer in this Site Collection
• Allow Site Owners and Designers to Detach Pages from the Site Definition
• Allow Site Owners and Designers to Customize Master Pages and Page Layouts
• Allow Site Owners and Designers to See the Hidden URL structure of their Web Site

Go to Site Actions -> Site Settings

In “Site Collection Administration” section click on SharePoint Designer Settings.

Update the appropriate settings.