The NDR submitted in December 2020 a planning application for the extension, this was approved in April 2021 with permission to extend the line 400 m north of the station. Trees were felled and bushes cleared on the section of the embankment between the station and Lamb House Bridge. In accordance with the planning permission granted by Dorset Council, a temporary diversion was created allowing the public to use the Trailway whilst a new Trailway was constructed along the eastern side of the embankment so that the trackbed for the Northern extension could be restored along the western side of the embankment. The Trailway diversion was completed during the Summer of 2022 and officially opened in August by Simon Hoare, MP. Throughout the summer of 2022 work continued reconstructing the embankment to the north of Lamb House Bridge. This had been excavated after the closure of the line to allow the construction of a tennis court. In October 2022 work started excavating spoil that had been dumped on the embankment during the construction of the industrial estate and transferring it over the bridge to complete the reconstruction of the embankment. In February 2023 a temporary diversion of the permissive path at the North end of the station was created allowing the construction of a pedestrian level crossing. The permissive path was restored and the last hump of soil obstructing the line of the trackbed for the extension was removed.
