Barnes Squash Club is a small friendly club with 2 well maintained courts. The monthly membership fee is very low compared with other London clubs and squash courts are readily available. Courts are booked online and each member is provided with an access key to the courts. The courts can be used between 8am and 9:30pm - 7 days a week. A great little club for social squash players. The website has lots more details.
Barnes Sports Club has a cricket green as well as a hockey pitch, three tennis courts and two squash courts. They also have a bar area.