What chat plugin are you using ?
That's why I said get modifyworld...
Get the plugin modify world which you can find here and then add the permission - modifyworld.* Modifyworld comes with PermissionsEX when you...
http://pastebin.com/Uu11MYyR ^ this should fix it :)
Please put this in pastebin. Then I can help you :)
You could implement buycraft, but it would be a complicated process
Please post your plugins & your permissions. Be sure that your PermissionsEX is up to date.
Separate names with a comma.