Is your property at risk of subsidence? The screening factors: shrinkable clay soil (most of North London), pre-war shallow foundations, substantial trees within ~15m, drainage age and defects, and — most importantly — actual symptoms: diagonal cracking, seasonal opening, sticking doors. Risk factors without symptoms mean vigilance, not alarm; symptoms mean assessment.
Six-factor screening
Important: this tool provides general, indicative guidance only. It is not a survey, a diagnosis or a quotation, and it cannot assess your specific property. Figures are broad London planning ranges; the appointed professional confirms actual fees and any repair costs are confirmed by contractors pricing an engineered specification. If you are concerned about your property, request a structural assessment or call.