This study of building height was conducted through open source software and data obtained by the London Data Store and GLA data which is widely available. LiDAR technology was used to gather height data. The first stage was mapping of the terrain, then proceeding to overlay maximum heights as read through the roofs of buildings. With these two valuable datasets it was possible to derive building heights along the major thoroughfares and then across the Borough. The next stage involved joining the building footprints with the height data in order to obtain a visual representation of height along. Heights were checked through site visits and crosschecking with other popular mapping services. The resulting three dimensional map allows for an accurate representation of height, which has been studied in parallel to the 2D maps presented.