I am a newbie and have a question concerning what regulations/guidelines there are about using three comps from within the subjects sub-division. I have heard that this is not allowed at all by most underwriters. I have also heard that this is allowed as long as the sub-division isn't new (i.e. has a significant number of resales). I understand that each house has to be considered independently. But some guideance would be grealty appreciated. Thanks in advance.