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Subsidence Risk Checker by Postcode: Quick Guide

Quick guidance, plus our full guide.

Subsidence Risk Checker by Postcode: Quick Guide Property Survey and Construction

Updated October 2026 · Fraser Bond

Surveys · Subsidence

Checking subsidence risk

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Claysoils
Surveystill needed
Full guidebelow
In short: Postcode subsidence tools from geological surveys and insurers show the general ground risk for an area, which is often higher on London Clay. They don't tell you about a specific building, so if you see cracks or are buying an older home, get a survey. Our full guide covers warning signs, insurance and mortgages.

Frequently asked questions

Are postcode checkers accurate?

They show general risk, not the condition of a specific property.

When do I need a survey?

Before buying, or if you notice cracking.

Buying or selling?

Talk to our team or read the full guide.

Speak to our teamRead the full guide

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