RICS Level 3 Building Survey in Cathays, Cardiff

Cathays presents unique challenges for property purchasers that our surveyors understand intimately. The area is defined by dense rows of Victorian-era Pennant sandstone terraces, many built before 1919 using traditional solid-wall construction. These properties often feature lime mortar pointing rather than modern cement-based mortars, and many lack modern damp-proof courses. Understanding these construction methods is essential for identifying potential defects.

The local geology adds another layer of complexity. Cathays sits on the Severn Estuary floodplain with alluvial deposits in the ground composition, which can be susceptible to movement. Combined with the clay-rich soils common in the Cardiff area, this creates potential for subsidence and structural movement issues that a trained eye can identify during a thorough inspection. Our surveyors know exactly what to look for when examining foundations on this type of ground condition.

With approximately 79% of the housing stock being Victorian terraces and nearly one-third of households operating as Houses in Multiple Occupation (HMOs), the wear and tear on these properties can be significant. Our inspectors frequently find evidence of damp and mould issues, deterioration of original Pennant sandstone, and historical alterations that may lack proper building regulation approval. A Level 3 Survey is specifically designed to uncover these hidden problems.

The student population in Cathays (approximately 64.5% of residents) means many properties experience higher than average occupancy levels and faster wear on fixtures and fittings. This high turnover of tenants can mask underlying maintenance issues that only become apparent during a detailed professional survey. Our inspectors are experienced in assessing properties that have been subject to intensive rental use.

• Victorian Pennant sandstone construction
• Alluvial soil and floodplain location
• Traditional solid-wall build methods
• High density of HMOs and student housing
• Historical alterations without building control approval
• Age of housing stock (pre-1919)

The Victorian properties in Cathays were predominantly built using Pennant sandstone, a hard-wearing stone quarried locally in the South Wales valleys. This distinctive blue-grey stone gives the area its characteristic appearance, particularly along streets like Cathedral Road, Ruhlemann Street, and the roads surrounding Cathays Park. However, despite its durability, Pennant sandstone can deteriorate when exposed to decades of wet Welsh weather, and our surveyors know how to identify early signs of erosion and weathering that may require maintenance.

Many of these original Victorian walls were constructed with solid brick or stone masonry, meaning they lack the cavity that modern properties use to prevent moisture penetration. This solid-wall construction was the standard before the mid-20th century and creates specific challenges for insulation and damp resistance. Our inspectors assess the condition of original lime mortar pointing, which is softer than modern cement mortar and allows the walls to "breathe" but requires regular maintenance to remain effective.

The foundations of these Victorian properties are typically shallower than modern standards require, often built on ground-level sleeper walls with minimal depth. Combined with the alluvial soil conditions in parts of Cathays and the clay-rich ground that Characterises much of the Cardiff area, this creates potential for differential settlement and structural movement over time. Our surveyors are trained to identify the signs of this movement, including cracking patterns, door and window operation issues, and uneven floor levels.

Original features such as sash windows, decorative cornices, and period fireplaces are common in Cathays Victorian properties. While these add character and value, they also require specific knowledge to assess properly. Our surveyors understand the maintenance requirements of these traditional features and can advise on their current condition and any repairs that may be needed.

Given the age and construction type of properties in Cathays, our surveyors frequently encounter several recurring issues. Damp and mould are highly prevalent, caused by the age of the stock, original solid-wall construction lacking modern insulation, and the high density of HMO usage where properties may experience higher moisture levels from multiple occupants. Rising damp and penetrating damp are commonly identified in these Victorian terraces, particularly in ground floor rooms and basements where the original damp-proof courses may have failed or never been installed.

Structural movement is another significant concern. The shallow foundations common in Victorian properties, combined with alluvial soil conditions and clay-rich ground that can shrink and swell with moisture variations, can lead to settlement issues over time. Our surveyors are trained to identify signs of subsidence, wall cracking, and movement that may indicate structural problems requiring further investigation. In Cathays, we particularly watch for cracking in the Pennant sandstone frontages, which can indicate foundation movement.

The deterioration of original Pennant sandstone and lime mortar pointing is a continuous maintenance issue in the area. Stonework can weather and erode, particularly on north-facing elevations that receive less sunlight, while lime mortar can wash out or become damaged, allowing water penetration. Our reports identify areas where repointing or stone repair may be needed and provide guidance on appropriate traditional repair methods that maintain the building's breathability.

Roof and chimney defects are also frequently found, as these are often the original Victorian components that have surpassed their expected lifespan. Missing or slipped tiles, deteriorated flashing, and damaged chimney stacks are common findings. Historical renovations and alterations that were not approved by building control are another common finding that can complicate future renovations or affect insurance coverage. Our surveyors check for building regulation approval documentation where visible and note any unapproved works in the report.