The professional era and the impact of the new RFU Courage League structure through the late 1980s, and 90s led to a decline in the size of the club as greater attention was paid to the needs of the 1st XV, and Streatham's membership struggle coincided with its drop down the National and then London leagues.

Streatham run three senior men's teams and a senior ladies' XV during the season, as well as a mini and junior rugby section, and own a private ground in Thornton Heath (close to the original pitches on Streatham Common), comprising two pitches (one floodlit) and a large clubhouse and grandstand, along with several squash courts, which are all in the process of refurbishment and renovation.

John Sharland of Streatham toured with the 1904 British Lions to Australia and New Zealand, playing in seven matches.

Super League player Will Sharp, played for the 1st XV, before signing his first professional contract with Harlequins RL in 2007.

Celebrity chef Antony Worrall Thompson played for the club's Colts side from 1969–71 before touring France to learn his trade.