RICS Level 3 Building Survey in Llangan

The geology underlying Llangan and the wider Vale of Glamorgan presents specific considerations for property owners. The Lias Group rocks that dominate the area contain limestone, shales, and mudstones, with clay-rich soils that can experience shrink-swell behaviour. This means properties built on these soils may be susceptible to ground movement, potentially leading to subsidence or heave issues that affect foundations and structural integrity. Our inspectors are familiar with these local ground conditions and know what signs to look for when assessing properties in this area, including crack patterns in walls, door and window binding, and signs of movement in the surrounding grounds.

The local housing stock in Llangan reflects its rural character, with a significant proportion of older, traditionally constructed properties. Many homes feature solid walls constructed from local stone, lime mortar pointing, and slate or tile roofing. While these traditional buildings have considerable character, they often require more specialized knowledge to assess properly. Our surveyors understand the specific defects that affect older properties in this region, from deterioration of lime mortar to the effects of rising damp in solid wall constructions. We examine properties with the understanding that age-related issues often interact in complex ways that require experienced interpretation.

The village has seen a notable proportion of detached properties (55.4%) and semi-detached homes (27.5%), with terraced properties (11.2%) and flats (5.9%) making up the remainder. Each property type brings its own set of typical defects, and our Level 3 Survey examines them all. For properties showing signs of structural movement, significant damp, or those that have been substantially altered, a comprehensive survey is strongly recommended to understand the full extent of any issues. Detached properties in particular, which dominate the local market at over half of all homes, often have more complex roof structures and multiple exposure walls that can be more vulnerable to weather penetration and structural stress.

Unlike some parts of South Wales, Llangan does not have a history of coal mining, meaning mining subsidence is not a significant concern for properties in this area. However, surface water flooding can occur in low-lying areas during periods of heavy rainfall, particularly where properties are located near natural drainage paths or small watercourses that traverse the village. Our surveyors assess these environmental factors as part of the overall property evaluation, noting any evidence of previous water ingress or flood damage that could affect the property's long-term durability and insurance implications.

• Detailed inspection of all accessible structural elements
• Assessment of walls, floors, ceilings, and roof structure
• Identification of damp, rot, and timber defects
• Evaluation of local geology and ground conditions
• Analysis of any signs of subsidence or movement

Properties in Llangan reflect the traditional building practices of the Vale of Glamorgan, with older homes predominantly constructed using local Lias limestone. This cream-coloured limestone has been quarried locally for centuries and gives many buildings their distinctive appearance. Traditional cottages typically feature thick solid walls, often 400-600mm in thickness, which provide excellent thermal mass but can present challenges when assessing damp penetration and breathability. Our inspectors understand that lime mortar pointing is commonly used in these older properties, and its deterioration can allow water ingress that leads to damp issues throughout the building.

The roofing on older Llangan properties typically consists of natural slate or clay tiles, reflecting the traditional materials used throughout South Wales. These roofs often have a lifespan of 80-100 years when properly maintained, but many roofs in the area are now reaching or exceeding this age. We examine the condition of roof coverings carefully, checking for slipped tiles, deteriorated pointing at ridges and hips, and the condition of flashings around chimneys and roof windows. The felt underlay beneath the tiles is particularly important, as deterioration can allow water to penetrate into the rafters and ceiling timbers, causing rot and structural damage that may not be visible from inside the property.

More modern properties in Llangan, particularly those constructed from the 1970s onwards, typically feature cavity wall construction with brick outer leaves and blockwork inner leaves. These properties often have concrete tiled roofs and uPVC windows and doors. While generally more straightforward to assess than traditional buildings, these properties still require careful inspection for issues such as cavity bridging, condensation problems, and the condition of concrete elements that can suffer from carbonation and reinforcement corrosion over time. Our survey approach adapts to each property's construction type, ensuring we identify the issues most relevant to that specific building.

For properties that may be listed or located in conservation areas, additional considerations apply. St Canna's Church in Llangan is a Grade I listed building, indicating the historical significance of certain properties in the area. Any listed building will require particular attention to its structural condition and the specific constraints imposed by listed building consent requirements from the Vale of Glamorgan Council. Our surveyors are experienced in assessing historic and traditionally constructed buildings, understanding that repair and maintenance approaches for such properties often differ significantly from modern construction methods.

Properties in Llangan, particularly those built before 1919 using traditional methods, often present with damp-related issues. Rising damp occurs when moisture from the ground travels up through porous solid walls, often due to a missing or failed damp-proof course. Penetrating damp results from water ingress through defective pointing, damaged render, or compromised roof coverings. Given the age of many properties in the area, condensation can also be problematic, particularly in properties with inadequate ventilation or where modern double-glazing has been installed without adequate background ventilation. Our inspectors use moisture meters and thermal imaging equipment to identify the extent and cause of damp issues, distinguishing between different moisture sources to provide accurate diagnoses.

Roofing defects are frequently identified during our surveys of Llangan properties. Older roofs constructed with natural slate or clay tiles often show signs of wear, including slipped or broken tiles, deteriorated pointing at ridges and hips, and damaged or missing flashings around chimneys and roof windows. The felt underlay beneath roof coverings can deteriorate over time, leading to water penetration into the roof structure. Our inspectors examine these elements carefully and report on their current condition and expected remaining lifespan. We also assess the condition of parapet walls, which are common on period properties and can be a source of water penetration if not properly maintained.

Timber defects represent another common finding in the area's older properties. Wet rot and dry rot can affect timber elements, particularly where damp conditions exist. Woodworm (common furniture beetle) can also be present in older timber structures. These issues are often related to underlying damp problems, and our surveyors identify both the symptom and likely cause. For properties with significant timber defects, we may recommend further investigation by a specialist timber treatment contractor. We pay particular attention to roof trusses, ceiling joists, and floor timbers, as these structural elements are critical to the building's integrity.

Foundation and substructure issues can arise in Llangan due to the local clay soils that exhibit shrink-swell behaviour. During prolonged dry periods, clay soils can shrink and cause foundations to settle unevenly, while during wet periods they can expand and cause heave. This movement can manifest as cracking in walls, particularly around window and door openings, and as doors and windows becoming difficult to open or close. Our inspectors are trained to identify the signs of such movement and will advise if further investigation by a structural engineer is warranted. We also assess the condition of any retaining walls or garden walls, which can be particularly vulnerable to movement in properties on sloped sites.

• Rising damp and penetrating damp
• Roof covering deterioration
• Slate and tile slippage
• Wet and dry rot
• Woodworm infestation
• Chimney structural concerns
• Foundation movement due to clay soils