Named after the Chart family for their long association with Mitcham.
From the Mitcham Cricket Green Conservation Area and Appraisal Plan July 2013 (pdf):
A short terrace of late 20th Century cottages on the site of a former tennis court formerly within the garden of 21 Cricket Green. Two-stories and built of rendered blockwork these are of pastiche Victorian styling with traditional style sash windows and projecting canopies over the entrances.

1953 OS Map showing tennis courts behind no. 21

aerial view from Bing Maps