North Yorkshire · Subsidence Risk
Subsidence risk in York: what to check before buying
York sits on the Vale of York lowland with bedrock of Mercia Mudstone overlain by thick glaciolacustrine silts and clays from the proglacial Lake Humber, plus river-terrace sand and gravel near the Ouse. The mix produces a generally moderate clay shrink-swell profile.
Last updated: 6 May 2026. Editorially reviewed: 20 May 2026.
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Check subsidence signals for a UK address in 15 seconds
BGS clay susceptibility, building age, tree context and the things to ask your surveyor.
Run a free previewBGS clay susceptibility for York
BGS GeoSure rates the city as moderate clay susceptibility, lower than London or south-east England but with localised pockets of higher risk where the lake clays are thick. Clay-driven subsidence is uncommon compared to flood as a buyer issue.
BGS GeoSure publishes shrink-swell susceptibility ratings at 1:50,000 scale, covering the whole of Great Britain. Most insurer subsidence-risk models begin with this dataset. Conveyancers' environmental searches use BGS data plus mining and contamination layers to produce a per-address report.
Trees, drainage and other risk factors in York
Mature trees within proximity of clay foundations remain the standard trigger. The bigger heritage-property issue in York is movement in masonry from soft river-terrace ground beneath foundations of older properties. This is not classical clay shrink-swell but does show on surveys.
Three checks the survey should cover:
- Tree species, distance from foundations, and any TPO (Tree Preservation Order)
- Drain condition and any documented leaks (CCTV survey if older clay drains)
- Crack pattern: BRE Digest 251 categories 0–5 with width, location, and direction
Mining-era subsidence in York
No significant historic coal mining within York city itself. Selby coalfield workings sit east of the city; deep mine subsidence risk to York-postcoded properties is generally low but should still be confirmed via the Coal Authority CON29M for any property near the coalfield boundary.
What subsidence means for your mortgage and insurance
Lenders treat historic, stabilised subsidence as standard if there is a structural engineer's report and any underpinning is documented. Active subsidence triggers retentions, specialist insurer placement, and in some cases lender refusal until remediation is complete and stable.
Insurance is the bigger ongoing constraint. A property with a prior subsidence claim sits in a constrained insurer market. The existing insurer typically continues cover but new business placement is harder. Disclosure of any prior claim is required on the seller's TA6 form.
How to check your specific address
City-wide context is orientation. Per-address checks before offer:
- 1Pull the BGS shrink-swell susceptibility for the postcode (free at bgs.ac.uk/datasets/geosure).
- 2Order a Coal Authority CON29M report if the property is in a historic coalfield boundary. Your conveyancer arranges this.
- 3Read the TA6 form for any prior subsidence claim, structural movement, or insurance involvement.
- 4Commission a RICS Level 3 (Building Survey) for any property over 60 years old in a high-clay-susceptibility area.
Run the check
Check subsidence signals for a UK address in 15 seconds
BGS clay susceptibility, building age, tree context and the things to ask your surveyor.
Run a free previewFrequently asked questions
Is subsidence common in York?
York sits on the Vale of York lowland with bedrock of Mercia Mudstone overlain by thick glaciolacustrine silts and clays from the proglacial Lake Humber, plus river-terrace sand and gravel near the Ouse. The mix produces a generally moderate clay shrink-swell profile. BGS GeoSure rates the city as moderate clay susceptibility, lower than London or south-east England but with localised pockets of higher risk where the lake clays are thick. Clay-driven subsidence is uncommon compared to flood as a buyer issue.
Will subsidence affect my mortgage in York?
Lenders treat historic, stabilised subsidence as standard if a structural engineer's sign-off is in place. Active or progressive subsidence triggers retentions, specialist insurer placement, and in some cases lender refusal until remediation is complete.
What should the survey cover for subsidence in York?
Mature trees within proximity of clay foundations remain the standard trigger. The bigger heritage-property issue in York is movement in masonry from soft river-terrace ground beneath foundations of older properties. This is not classical clay shrink-swell but does show on surveys. The surveyor should record any cracks (BRE Digest 251 categories), assess proximity of trees and drains, and recommend a structural engineer's report where category 2+ cracking or active movement is suspected.
Keep going
Related York buyer pages
- Flood risk in York , the other major environmental check before offering.
- Full property check in York , 12 public-data checks for any York address.
- Subsidence monitoring on a survey , what surveyors mean by "monitor for movement" and what to do.
- Evidence of movement , the broader category surveyors use for cracking patterns.
Editorial review
Editorial owner: BiteRight Ltd, operator of MyPropertyScan. We review buyer guides against UK public property datasets, RICS survey wording, lender requirements, and common buyer questions.
Pages are updated when source coverage, property-risk guidance, survey cost assumptions, or product checks materially change. Methodology and dataset limitations are explained on the MyPropertyScan methodology page.
Sources used
We use UK public and specialist sources where they are available. Public datasets can be incomplete, delayed, or missing for some addresses. Treat them as a starting point, not as a replacement for professional advice.
Source standard: preference goes to official government datasets, statutory bodies, professional standards, and primary dataset publishers. We cite the source family on the page and explain coverage limits rather than filling gaps with unsupported estimates.
General information only. Not legal, mortgage, insurance, or surveying advice. Always confirm with your own surveyor, broker, and conveyancer before making decisions. MyPropertyScan is operated by BiteRight Ltd.