weburbanist.com
Iceberg Homes: London Boroughs Curb Luxury ‘Super-Basements’ - WebUrbanist
It is increasingly common to find London properties that have more subterranean interior space than above-ground square footage, a byproduct of the wealthy desiring to build additions without tripping over surface-oriented building codes. New legislation in some boroughs of the city aims to cut down on permits issue to such underground expansions and could provide guidance