Coastal risks, such as marine submersion and erosion, are now burning issues due to the increasing occurrence and intensity of climatic phenomena. The coastal fringe hosts 40% of the world’s population, requiring the development of innovative, agile but accurate, monitoring methods. Unmanned Aerial Vehicle (UAV) is now essential for monitoring sedimentary changes using passive photogrammetry at the decimeter and daily resolutions. Recently, UAVs have been fitted with active LiDAR (Light Detection And Ranging) sensors, increasing both accuracy and precision through the lasergrammetry. The Anse Du Guesclin’s dune in Brittany, France, has been impacted by human activities for seven decades. Construction of a road and parking in the 1960s halted sediment movement and hindered dune vegetation growth, despite restoration efforts in the 1980s. Recent UAV-borne LiDAR surveys since 2022 allowed analysis of sediment volume changes. Bulk results have revealed an inter-annual difference of + 7 292 m3 and − 2 637 m3. At the seasonal scale, a gain of + 2 359 m3 and a slight loss of 884 m3 were observed during the accreting summer period. In the winter season, prone to eroding storms, a gain of + 8 848 m3 and a loss of − 1 034 m3 were estimated. On an inter-annual or seasonal scale, the analysis of the volumes of the entire point cloud (ground + non-ground) has demonstrated the positive geo-ecological morphodynamism of the site.