RICS Level 3 Building Survey in Trevalga

The architecture in Trevalga reflects centuries of Cornish building tradition. Our surveyors regularly encounter properties constructed from local slate and granite, built with traditional lime mortars and renders rather than modern cement-based products. These older construction methods require an experienced eye to assess properly, as what might appear to be a minor defect could actually indicate a significant structural issue. A Level 3 Survey goes beyond the basic visual inspection, providing you with a comprehensive understanding of the property's condition.

The hamlet's coastal position means properties face exposure to salt-laden winds and driving rain. Over decades, this can cause deterioration of external stonework, timber joinery, and roof coverings. Our inspectors pay particular attention to these coastal effects, checking for signs of penetrating damp, salt crystallisation in stonework, and corrosion of any hidden metal fixings. We also assess the condition of leadwork around chimneys and roof penetrations, which can deteriorate more rapidly in marine environments.

Trevalga's historic properties were typically built before modern building regulations existed, meaning they often lack the cavity walls and damp-proof courses that we expect in contemporary construction. Our Level 3 Survey specifically addresses these traditional building characteristics, identifying where remedial work may be needed to bring the property up to a reasonable standard while respecting its historic character. Properties like The Old Rectory on Trevalga Hill, which sold for £875,000 in 2018, exemplify the type of significant historic homes in this area that require detailed structural assessment.

• Traditional stone and slate construction
• Pre-1919 building methods
• Coastal weathering effects
• Historic mortars and renders
• Potential mining subsidence
• Conservation considerations

Properties in Trevalga typically exhibit construction methods that differ substantially from modern building practice. The traditional Cornish cottage construction often features solid walls built from locally sourced stone, typically 450-600mm thick, with internal lime plaster applied directly to the stonework. These solid walls lack the cavity that modern construction uses to prevent moisture penetration, meaning our surveyors must assess the condition of any existing damp-proofing arrangements carefully. Understanding how these traditional walls perform in Cornwall's wet climate is essential for accurate defect identification.

Roof construction in older Trevalga properties typically consists of timber rafters bearing onto load-bearing walls, often with purlins supporting the rafters at mid-span. The original roof coverings were generally local slate, laid on timber sarking boards or directly onto rafters. Our inspection examines the condition of these timber elements, checking for signs of past water ingress, woodworm activity, or structural movement that might indicate inadequate load-bearing capacity. The age of these properties means timber elements may have been exposed to decades of seasonal moisture cycles.

Another characteristic feature of Trevalga's historic properties is the use of traditional lime-based mortars and renders. Unlike modern cement-based products, lime mortars allow moisture to evaporate from within the wall structure, which helps prevent damp accumulation. However, these mortars can deteriorate over time, particularly where hard cement-based renders have been applied inappropriately. Our surveyors can identify where such inappropriate repairs have been carried out and advise on sympathetic remediation using traditional materials that will maintain the building's breathability.

• Solid stone walls 450-600mm thick
• Timber rafter and purlin roofs
• Local slate coverings
• Lime mortar and render
• No cavity wall construction
• Traditional timber-framed windows

Our experience surveying properties across north Cornwall means we know what to look for in Trevalga's historic homes. Damp penetration ranks among the most frequently identified issues, particularly in properties built with solid walls rather than cavity construction. Rising damp can affect ground-floor walls, while penetrating damp often appears around windows, in roof spaces, and where wall plates sit on external walls. Our inspectors use their expertise to distinguish between historic damp staining and active, problematic damp that requires remediation.

Timber defects represent another significant category of findings in older Cornish properties. Woodworm infestation, wet rot, and dry rot can all affect structural timbers and joinery, particularly in properties where roof coverings have allowed water ingress over the years. We carefully inspect all visible timber for signs of insect activity and fungal decay, noting any areas of concern that require further investigation or treatment by a specialist contractor.

Roof issues are particularly common given the traditional slate coverings used throughout the area. Slate slippage, deterioration of ridge tiles, and failed leadwork around chimneys all feature regularly in our reports. The inspection includes accessing the roof where safe and practical to do so, or using drones for properties where direct access is difficult. We also examine flat roofs, parapet walls, and other details that can allow water penetration.

The underlying geology of Cornwall presents additional considerations. While Trevalga itself does not have a documented history of mining subsidence, the wider county has extensive historical mining activity. Our surveyors are trained to look for signs of ground movement or mining-related features that might indicate subsidence risk. Similarly, we assess the potential for clay shrink-swell movement in soils, which can affect foundations in certain ground conditions. Cornwall's diverse geology includes slate, granite, and other metamorphic rocks that can create varied ground conditions affecting property foundations.

• Rising and penetrating damp
• Woodworm and timber rot
• Slate roof deterioration
• Leadwork failure
• Ground movement signs
• Window and door joinery decay