Wealthy London residents are extending many floors beneath their homes . The aim is to increase their value and provide extra room . Comment: Some have installed swimming pools , gyms and cinemas in their extended basements .
Wealthy London residents are extending many floors beneath their homes . The aim is to increase their value and provide extra room . Tight space and strict planning laws make extending upwards or outwards difficult . Some have installed swimming pools , gyms and cinemas in their extended basements .