Back in November 2017, I used Land Registry data to try to map the land owned by the 11 largest UK housebuilders: more than 42,000 land titles owned via 1,400 subsidiaries.

I was hoping to investigate land banking, but the lack of geospatial data makes it impossible. Read why we still don't know what the housebuilders own.

Analysis and mapping by Anna Powell-Smith.

TLDR: All locations on this map are approximate: many are wrong. Find out why.

HM Land Registry Corporate and Commercial Ownership Data as of 8 November 2017. Information produced by HM Land Registry © Crown copyright 2017. Contains OS data © Crown copyright and database right 2017. Contains Royal Mail data © Royal Mail copyright and Database right 2017. Contains National Statistics data © Crown copyright and database right 2017. Green belt areas (England) contain OS data © Crown copyright and database right (2017). Protected areas: Special Areas of Conservation (England) and Special Protection Areas (England) contain public sector information licensed under the Open Government Licence v3.0. Map definitely contains errors; use with caution.