RICS Level 2 Surveys in CR5

Across the 1920s and 1930s, Coulsdon expanded quickly as the Southern Railway electrification programme drove a burst of suburban housebuilding. A large share of the semi-detached and terraced homes that define the CR5 area come from that inter-war period, so buyers are often taking on properties that are 80 to 100 years old. At that age, it is common to find original electrical wiring, roofing materials nearing the end of their useful life, and drainage systems that have never been replaced. Our surveyors know the usual weak points in 1920s and 1930s construction, and our report sets out exactly what we found.

Older CR5 streets still contain plenty of Victorian and Edwardian homes, sitting alongside post-war schemes and more modern infill. Geologically, CR5 lies within the North Downs, where chalk is the main underlying formation, although lower-lying pockets of clay do occur. Where houses stand on clay-bearing ground, there is a risk of subsidence linked to tree root activity and shrink-swell movement, which matters in Coulsdon because so many established gardens have mature trees. On every CR5 inspection, we look closely for signs of ground movement.

• Inter-war semi-detached and terraced houses from the 1920s and 1930s Coulsdon expansion
• Victorian and Edwardian terraces in older parts of the town
• Post-war estates with a mixture of houses and bungalows built 1945-1980
• Modern infill developments and converted flats in larger period properties
• Conservation area properties along protected streetscapes with stricter planning controls

CR5 sits on the North Downs chalk, which is generally a geologically stable formation. Even so, some locations have clay deposits above the chalk, including London Clay and Reading Beds. Where that clay is present, the ground can be prone to shrink-swell movement, expanding in wet weather as it takes in water and contracting in dry spells, which can lead to differential movement beneath foundations. In long-established suburban roads such as those in Coulsdon, mature trees can increase the risk sharply because their roots draw moisture from clay soils across a wide radius and speed up summer drying. That is why, on every CR5 inspection, we check carefully for evidence of clay-related movement.

CR5 is not in a high fluvial or coastal flood risk zone, but surface water flooding is a real issue in parts of the area. Heavy rainfall can overwhelm drainage in older suburban streets, with water then collecting in lower-lying gardens and driveways, and sometimes even reaching ground floor interiors. The Environment Agency keeps detailed surface water flood risk maps that buyers can check against a specific address, and we also recommend a formal drainage and flood risk search through a solicitor during conveyancing.

• Check the British Geological Survey map for clay soil presence at your specific CR5 property address
• Look for mature trees within 10-15 metres of the property that could affect clay soils and foundation stability
• Use the Environment Agency surface water flood risk map to check your property's specific exposure
• Ask your solicitor to obtain a drainage and environmental search covering flood and subsidence risk
• Review any historic subsidence insurance claims through a specialist property search provider

We work to the RICS Home Survey Standard, which sets the minimum inspection scope for each property element. Our inspectors assess the exterior, the interior, and the services, record what they found for each element, and apply the appropriate condition rating. In CR5, where inter-war and Victorian homes are common, we pay particularly close attention to roof coverings, as ageing concrete or clay tiles are a frequent source of condition rating 2 or 3 issues, to timber floor structures, because suspended floors in older houses can be vulnerable to rot and woodworm, and to the condition of the drainage system.

• Roof tiles, slates, and flat roof sections for deterioration, slipped tiles, or evidence of active leaks
• Gutters, downpipes, and rainwater goods for blockages, rust, or failed joints
• External walls for cracking, spalling brickwork, failed pointing, or evidence of damp penetration
• Damp-proof course condition, particularly in Victorian and Edwardian solid-wall properties
• Internal walls and ceilings for staining, cracking, or signs of rising or penetrating damp
• Suspended timber floors and accessible joists for woodworm, wet rot, dry rot, or excessive deflection
• Electrical consumer unit for signs of outdated fuse boards or potentially unsafe wiring types
• Drainage inspection covers where accessible, to check pipe condition and look for blockage or root ingress
• Outbuildings, garages, and boundary structures for structural stability and condition