When purchasing residential property in London, commissioning a Building Survey is one of the most important steps in the due diligence process.
Experienced Building Surveyors regularly identify a wide range of defects during a Level 3 Survey that may affect the structural condition, safety, or long‑term maintenance requirements of a property.
London contains an extremely varied housing stock including Georgian, Victorian and Edwardian buildings alongside post‑war and modern developments.
Each construction period presents different building materials and potential defects.
This guide highlights 50 of the most common defects identified by Building Surveyors during a Building Survey in London.
Understanding these issues can help property buyers appreciate the importance of commissioning a detailed Level 3 Survey.
Structural Defects Identified During a Building Survey
• Subsidence and structural movement – commonly identified by Building Surveyors during a Level 3 Survey.
• Cracking in loadbearing masonry – commonly identified by Building Surveyors during a Level 3 Survey.
• Bulging brickwork – commonly identified by Building Surveyors during a Level 3 Survey.
• Settlement cracks around openings – commonly identified by Building Surveyors during a Level 3 Survey.
• Movement around bay windows – commonly identified by Building Surveyors during a Level 3 Survey.
• Failed lintels above windows and doors – commonly identified by Building Surveyors during a Level 3 Survey.
• Deterioration of structural timbers – commonly identified by Building Surveyors during a Level 3 Survey.
• Deflection of floor joists – commonly identified by Building Surveyors during a Level 3 Survey.
• Roof spread in pitched roofs – commonly identified by Building Surveyors during a Level 3 Survey.
• Structural alterations without adequate support – commonly identified by Building Surveyors during a Level 3 Survey.
Roof Defects Found During Building Surveys
• Missing or slipped roof tiles – frequently observed during a Building Survey of London properties.
• Broken slate roof coverings – frequently observed during a Building Survey of London properties.
• Deteriorated roof felt – frequently observed during a Building Survey of London properties.
• Defective lead flashings – frequently observed during a Building Survey of London properties.
• Chimney stack deterioration – frequently observed during a Building Survey of London properties.
• Loose chimney pots – frequently observed during a Building Survey of London properties.
• Blocked gutters and downpipes – frequently observed during a Building Survey of London properties.
• Roof timber decay – frequently observed during a Building Survey of London properties.
• Flat roof membrane failure – frequently observed during a Building Survey of London properties.
• Inadequate roof ventilation – frequently observed during a Building Survey of London properties.
Damp and Moisture Defects
• Rising damp within masonry – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Penetrating damp through external walls – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Condensation and mould growth – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Bridged damp proof courses – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Defective cavity wall insulation – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Leaking rainwater goods – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Damp penetration around windows – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Poor drainage around foundations – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Moisture trapped within cavity walls – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
• Inadequate ventilation – commonly detected during a Level 3 Survey undertaken by Building Surveyors.
External Fabric Defects
• Brickwork spalling – issues often highlighted within a detailed Building Survey report.
• Deteriorated mortar joints – issues often highlighted within a detailed Building Survey report.
• Cracked render – issues often highlighted within a detailed Building Survey report.
• Defective pointing – issues often highlighted within a detailed Building Survey report.
• Stone weathering – issues often highlighted within a detailed Building Survey report.
• Damaged parapet walls – issues often highlighted within a detailed Building Survey report.
• Movement in boundary walls – issues often highlighted within a detailed Building Survey report.
• Defective window frames – issues often highlighted within a detailed Building Survey report.
• Timber decay in external joinery – issues often highlighted within a detailed Building Survey report.
• Corroded wall ties – issues often highlighted within a detailed Building Survey report.
Internal Building Defects
• Cracked internal plaster – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Uneven floors – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Squeaking floorboards – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Rot in timber floors – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Poor loft insulation – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Cold bridging around openings – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Defective internal joinery – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Ceiling cracks – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Water staining from leaks – defects frequently identified by Building Surveyors during a Level 3 Survey.
• Inadequate fire separation in conversions – defects frequently identified by Building Surveyors during a Level 3 Survey.
Why a Level 3 Building Survey is Essential
A Level 3 Survey provides the most detailed Building Survey available for residential property purchases.
By instructing experienced Building Surveyors, buyers can identify defects before committing to the purchase.
Many of the defects listed above can be expensive to repair if they remain undetected. A professional Building Survey
helps buyers understand the condition of the property and make informed decisions about repairs, negotiation and future maintenance.
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