Property Subsidence Assessment dataset 2025
type: Dataset
description: The BGS PSA dataset provides insurers and homeowners access to a better understanding of the shrink-swell hazard at both the individual property and/or postcode level for Great Britain. It builds upon the GeoSure shrink-swell data by mapping the hazard to the individual building polygon and considering the other susceptibility factors of building type, foundation depth, and drainage and tree proximity. The user receives GIS building polygons with an overall susceptibility to subsidence score between 1-100. Scores are also classified from non-plastic to very high. Each building polygon is also scored from 1-10 for each subsidence factor (geology, foundation, drainage, building type, building storey and tree proximity). Postcode data is also available as a table and shapefiles showing the ‘average’ PSA score for all buildings within the postcode. The identification of shrink-swell related subsidence prone areas, alongside the inclusion of potential sources to exacerbate this phenomena, can better inform insurers and homeowners and form the basis to make decisions concerning prevention and remediation. The product enhances geological information obtained from GIP and GeoSure via the inclusion of the crucial shrink-swell susceptibility factors (proximity to trees and foundation depth). This therefore allows the derivation of a risk element for the housing stock at Building level, which is then generalised to Postcode level.
issued: 2026-06-18T15:34:09.028610
modified: 2026-07-30T19:40:50.913556
spatial: Location
  geometry: {"type": "Polygon", "coordinates": [[[2.6955, 49.8165], [-7.4829, 49.8165], [-7.4829, 60.7850], [2.6955, 60.7850], [2.6955, 49.8165]]]}
keyword: Foundations
keyword: NERC_DDC
keyword: Shrink-swell clays
keyword: Subsidence

Citation Information - Digital Object Identifier (DOI)
type: Distribution
description: British Geological Survey. (2026). Property Subsidence Assessment dataset 2025 [Dataset]. British Geological Survey. https://doi.org/10.5285/31f5041f-f1f6-40ed-897b-513f903a56ea
issued: 2026-07-30T19:40:50.959811
modified: 2026-07-30T19:40:50.922465
access URL: https://doi.org/10.5285/31f5041f-f1f6-40ed-897b-513f903a56ea

BGS Datasets - Property subsidence assessment
type: Distribution
description: Resource page for dataset with contact and licensing details.
issued: 2026-07-30T19:40:50.959809
modified: 2026-07-30T19:40:50.922384
access URL: https://www.bgs.ac.uk/datasets/property-subsidence-assessment/

British Geological Survey (BGS)
type: Organization