RICS Level 2 Surveys in CR5

Coulsdon developed rapidly during the inter-war period, with the Southern Railway electrification programme in the 1920s and 1930s spurring a wave of suburban housebuilding. Many of the semi-detached and terraced properties that characterise the CR5 area date from this period, meaning buyers are frequently purchasing homes that are 80 to 100 years old. Properties of this age often have original electrical wiring, roofing materials approaching the end of their useful life, and drainage systems that have never been replaced. Our surveyors know where these issues typically appear in 1920s and 1930s construction, and our report tells you what we found.

The area also has a significant proportion of Victorian and Edwardian stock in its older streets, alongside post-war developments and modern infill. CR5 sits within the North Downs, with chalk as the dominant underlying geology, though pockets of clay are present in lower-lying areas. Properties on clay-bearing ground are at risk of subsidence driven by tree root activity and shrink-swell ground movement, a particularly relevant consideration given the mature trees common in the established gardens of Coulsdon. Our inspectors look specifically for signs of ground movement during every CR5 inspection.

• 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 chalk of the North Downs, which is a geologically stable formation. However, chalk in this area is overlaid in some locations by clay deposits, including London Clay and Reading Beds. Where clay is present, the ground is susceptible to shrink-swell movement: it expands during wet weather as it absorbs water and contracts during dry spells, causing differential movement beneath foundations. In established suburban streets like those in Coulsdon, mature trees compound this risk significantly, as their roots extract moisture from clay soils over a wide radius and accelerate ground drying during summer. Our surveyors check specifically for evidence of clay-related movement during every CR5 inspection.

CR5 does not sit within a high fluvial or coastal flood risk zone, but surface water flooding is a relevant risk across parts of the area. During heavy rainfall events, drainage systems in older suburban streets can be overwhelmed, leading to surface water accumulation in lower-lying gardens, driveways, and in some cases, ground floor interiors. The Environment Agency maintains detailed surface water flood risk maps that buyers can consult for their specific property address, and we recommend obtaining a formal drainage and flood risk search through your solicitor as part of the conveyancing process.

• 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

Our inspectors follow the RICS Home Survey Standard, which defines the minimum scope of inspection for each property element. We assess the exterior, the interior, and the services, noting what we found at each element and assigning the appropriate condition rating. For inter-war and Victorian properties that are typical of CR5, our inspection pays particular attention to the roof coverings (where ageing concrete or clay tiles are a common source of condition rating 2 or 3 items), the condition of timber floor structures (where suspended floors in older properties are vulnerable to rot and woodworm), and the state 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