RICS Level 3 Survey in St. Mewan

Properties in St. Mewan and across the wider St Austell area bring challenges that only a comprehensive RICS Level 3 Survey can properly pick apart. Devonian slates and grits dominate the local geology, with pockets of granite intrusion and kaolinitic clay deposits, and that mix can encourage shrink-swell movement beneath homes. Over time, that instability may lead to structural movement, especially in older buildings with shallow foundations. Our inspectors are trained to spot the signs and judge whether past or present ground conditions are giving cause for concern.

St. Mewan’s housing stock reflects Cornwall’s architectural history, and a notable share of it dates from the pre-1919 period. Many of these older homes use solid wall construction, with local stone, cob, or early brick methods that are very different from modern cavity wall builds. They may have stood for generations, but they still need an experienced eye to assess them properly. Our Level 3 survey does that work, checking roof structures, load-bearing walls, floors, and the building envelope in detail.

Cornwall’s climate also means damp turns up again and again in St. Mewan properties. Penetrating damp, rising damp, and condensation are all familiar problems in older homes, especially those with solid walls that do not have the cavity space seen in modern construction. Timber can suffer too, with woodworm or rot appearing where damp has been allowed to linger. Our inspectors go through these issues methodically, using moisture meters on walls and checking accessible timber for infestation or decay.

The wider St Austell economy, long linked to china clay extraction, has shaped how the area developed. Some homes were built for workers in that industry, while others come from the parish’s agricultural past. From workers' cottages to farmhouses and newer family homes, the mix is wide enough that every property needs its own assessment, not a blanket judgement about build quality.

Surveying homes throughout St. Mewan has taught us exactly what to watch for in this part of Cornwall. Older stock, local clay soils, and a wet climate create a fairly familiar pattern of defects, and our surveyors are used to finding them. Whether it is slate roof deterioration on a period property or render failure on a solid-walled house, we record each issue with photographs and plain explanations.

Another concern here is structural movement. St. Mewan is not on the coast or beside a major river, but surface water flooding can still affect low-lying spots during heavy rain, with damp problems sometimes following. More importantly, clay deposits in the local geology can cause shrink-swell movement, shifting foundations through annual weather cycles. Our inspectors look closely at cracking patterns in walls that suggest this kind of movement and judge whether remedial work may be needed.

Traditional Cornish slate roofs are common in St. Mewan properties, and although they are durable, they do eventually need attention as slates age and mortar breaks down. We inspect hip roofs, gable ends, valleys, and flashing details, noting slipped slates, broken ridges, or evidence of earlier repairs. Chimney stacks on older homes often show decay in the pointing, damaged flashings, or worn brickwork, all of which our surveyors document carefully.

Render and other external wall finishes on solid-walled homes can crack, bulge, or fail altogether, especially where water has got in and frost damage has followed. We assess all render types, whether traditional lime-based finishes or newer cement render, and we note any areas where repair or replacement may be needed to stop further deterioration.

When our team carries out a RICS Level 3 Survey, you receive a report laid out in the standard RICS format, which keeps everything consistent and clear regardless of which surveyor handled the inspection. It starts with an executive summary that sets out the main findings and any urgent matters needing immediate attention. After that comes a detailed breakdown of each building element, from roof to foundations, with specific observations on condition and any defects noted.

Each section of the report uses the RICS condition rating system, from Rating 1 (no repairs required) through to Rating 3 (urgent repairs needed). That makes it straightforward to prioritise any remedial work. We do more than list problems, though, because the report also gives practical recommendations for dealing with each issue, from simple maintenance jobs that can be tackled at once to more substantial repairs that may call for specialist contractors. Where possible, we also include cost guidance, so you can gauge the likely financial impact of defects found.

Where we identify possible ground stability concerns in St. Mewan, the report may recommend further specialist investigation. That is especially relevant for properties built on, or close to, areas with clay deposits, or where cracking patterns suggest foundation movement. A Level 3 Survey gives a thorough visual assessment, but some matters need a geotechnical engineer or structural engineer to look more closely. If we think that is necessary, the report will say so plainly.

St. Mewan properties show the range of construction methods used across Cornwall’s history. Traditional solid wall construction is common in homes built before the 1930s, with many using local stone, granite, or cob walls that can be several hundred millimetres thick. These walls were usually built without cavities, so they depend on their mass and any existing render or paint finish to keep out the weather. Knowing how they work matters, particularly where modern retrofitting has altered how they originally behaved.

Post-war development in the area brought cavity wall construction, usually brick or blockwork with a gap between the inner and outer leaves. It gives better thermal performance and weather resistance, but it can still suffer from cavity bridging, missing insulation, or damp penetration where the outer leaf has been damaged. Our surveyors understand both forms of construction and know the defects to look for in each.

Roofing in St. Mewan is mostly natural slate, a long-established and durable material in Cornwall. Even so, as slate ages the fixing nails can corrode and slates can become brittle or slip. We inspect roof slopes, valleys, and flashings carefully, using ladder access where it is safe to do so. Flat roofs, where they exist, get particular attention because they are more vulnerable to water ingress than pitched roofs.