A Local Historic District (LDH) is a geographic area within a community singled out for its architectural, historic, cultural or archaeological importance.  Property in a historic district is protected from unsuitable change.  A lot and the buildings on it are part of the historic landscape that remain essentially the same from the time the district is established.  The State of Connecticut enacted legislation in 1961 to protect and preserve such areas by proclaiming them legal entities.

Local Historic District designations are the strongest legal forms of historic preservation available to municipalities in Connecticut. LHD mechanisms are implemented by a locally appointed municipal commission – the Historic District Commission (for the Town of Greenwich) – that has the express authority to review and approve exterior changes to historic properties that are visible from a public way.

The Town of Greenwich has three local historic districts: Strickland Road Local Historic District, John Street/Round Hill Road Local Historic District and Stanwich Local Historic District.