The Doorway of Greater Nashua

The Doorway of Greater Nashua | Southern NH Health The Doorway of Greater Nashua The Doorway provides a complete assessment, coordinated referral to treatment and supportive services for anyone living with a substance use disorder. GateHouse Recovery Solutions is not a shelter, but it does allow those seeking to be in an environment designed for recovery before transferring to the Doorway Program. Our main goal is to help people struggling with recovery get the help they need.