Ladbroke owned two separate 'islands' of land to the west of the main estate and of the area of Linden Gardens
In 1844 Ladbroke entered into a building agreement with William Henry Jenkins for the development of 28 acres in a the north east of the Notting Hill area. Jenkins was a civil engineer working in a Lincolns Inn Fields. After only a few months, Jenkins assigned his interest to a relative, William Kinnaird Jenkins who was already a successful building speculator in a Paddington area. He proceeded to develop the the 28 acres successfully, despite the economic downturn in the mid-1840s.
The main new road which Jenkins constructed was Pembridge Villas. Westbourne Grove, which started in Paddington, was extended through the land to join in Portobello Lane. But Chepstow Villas and Chepstow Crescent also built partly on this land.
Jenkins' principal contractor was William Judd. James Hall also worked in this area (but mainly on the Holland Estate). In 1847, Jenkins assigned part of the area to his solicitor, T W Budd who bought the freehold from Ladbroke in 1849.
In 1846 Jenkins leased a further 10 acres to the west from Robert Hall so he could extend Chepstow Villas to Portobello Lane and build Denbigh Road and Pembridge Crescent. The builders he used here were mainly James Hall and the Cullingford and Maidlow families.
Robert Waller owned most of the land which encircled the Ladbrokes'. In the south section he used Francis Radford as his builder. Francis Radford was originally from Devonshire, but lived in Kensington. Radford first began work in the area for Jenkins in 1848 when he built Nos. 37-41 (odd) Pembridge Villas. In 1849 his elder brother, William Radford, became his partner. That was the year when they joined the began developing Robert Hall's land, which was now in the hands of his executors since he had died recently. They were responsible for building Pembridge Square and Pembridge Gardens and most of the other land down to Notting Hill Gate itself