RICS Level 3 Survey Mawnan

Mawnan’s housing stock brings its own headaches, which is why a detailed structural survey matters so much. The parish has a striking run of historic properties, with numerous C17 and C18 listed buildings including Bareppa Farmhouse, Bosloe House, and The Sanctuary. These homes were built in traditional ways that sit a long way from modern methods, and our inspectors know exactly what to look for in killas rubble stone walls, granite dressings, and scantle slate roofs.

Killas stone, quarried from the surrounding hills, shapes the local geology and the way homes here need to be assessed. In Mawnan, properties often have solid stone walls with lime-based mortars, timber floors, and old roof timbers that call for specialist judgement. Our surveyors are used to the defects that turn up in Cornish properties of this age, from moisture coming through porous stonework to timber rot in floor joists and worn slate roofing that can lead to internal damp problems.

Over the years, many Mawnan homes have been altered quite heavily, and planning applications show everything from careful extensions to modernisation using both traditional and contemporary materials. That makes a Level 3 survey especially useful for any property that has been extended or substantially changed, because our inspectors can judge whether the work appears properly carried out and whether structural alterations have created fresh concerns.

There is also the setting to think about, because the Helford River and the surrounding coastline can affect how a property wears. Homes very close to the shore may face salt-laden air, which speeds up weathering on external surfaces, and the nearby waterways mean flood risk has to sit within any proper assessment. Our surveyors look for salt corrosion on metalwork, crumbling mortar joints in exposed coastal positions, and any sign of earlier flooding or water damage.

Every RICS Level 3 survey we carry out in Mawnan follows a structured process that covers the main building elements and defects. We begin outside, looking closely at the walls, especially the condition of killas rubble stone and any granite quoins or window reveals that are typical of local homes. From there we check for movement, cracking, bulging, or deterioration that might point to structural concerns. Because so many properties in Mawnan are old, we often come across historic fabric that needs a careful eye.

The roof is always given close attention. Where access allows, our surveyors go into the roof space to inspect the scantle slate covering, timber rafters, and chimney stacks. Many homes in Mawnan still have original slate roofs, and over the years these may have been patched using different materials and methods. We assess the overall condition and highlight any areas where water ingress may be happening or where structural timbers show decay. Many C17 and C18 properties in the area also have traditional cob or stone chimneys that may have been relined or need specific checking.

We also inspect the internal joinery, floor surfaces, walls, and ceilings for damp, rot, or pest infestation. If we find issues, the report includes clear photographs and plain explanations of what each defect means for the property, along with the kind of repair or remediation that may be needed. All accessible floor areas are checked, including cellars or sub-floor voids where damp and rot can build up. With the age of these homes and the local maritime climate, damp is one of the most common issues we pick up in Mawnan properties.

We also assess drainage, any outbuildings or attached structures, and the general grounds and access. For properties near the Helford River or in low-lying spots, we pay particular attention to flood risk indicators and any flood resilience measures already in place. That wider approach gives you a fuller view of the property’s condition, not just the obvious bits.

Every inspection in Mawnan takes account of the parish’s local environmental conditions. Bounded to the south by the Helford River and blessed with striking coastal scenery, the area also brings practical issues for property condition. Homes very near the coast may suffer from salt-laden air speeding up weathering on external surfaces, and the proximity to waterways means flood risk assessment belongs in any proper property evaluation.

Mawnan sits within historic Cornwall, a region with a long mining past. We did not find specific active mining subsidence risks for individual properties in our research, but our surveyors remain alert to the broader issues that can affect former mining areas and will look for signs of ground movement or settlement linked to earlier activity beneath the surface. Archaeological evidence of Iron Age and Romano-British activity in the area also suggests long-standing disturbance of the ground, which can have a bearing on modern foundations.

The proposed Goldmartin Field development of 42 homes off Sampys Hill brings new growth to Mawnan Smith, while planning applications continue to come through for conversions and extensions elsewhere in the parish. For any newer home, or a property that has been recently extended, our Level 3 survey can assess build quality and any concerns linked to recent work. The scheme includes both affordable and market housing, with construction methods that may look very different from traditional Cornish buildings.

Mawnan’s character owes a great deal to its four sub-tropical gardens, Glendurgan, Trebah, Carwinion, and Meudon, which bring in thousands of tourists each year and help support the area’s premium property market. Mawnan Smith itself has a post office, The Red Lion Inn, a working smithy, and a range of community facilities. All of that feeds into local demand, but it also means property prices sit high compared with the wider Cornwall region, making a thorough survey all the more important before you buy.

From our experience surveying homes across Mawnan, we keep seeing a few defect patterns that buyers should be ready for. Age is a big factor, and damp is the issue we encounter most often, whether it is driving rain pushing through porous killas stone, rising damp from ground levels, or condensation caused by modern double-glazing fitted without enough ventilation in traditionally built homes.

Timber defects are another major concern in Mawnan properties. A mix of age, damp conditions, and, at times, poor sub-floor ventilation means wood rot and woodworm infestation show up fairly regularly, especially in floor joists, roof timbers, and window frames. Our surveyors can tell the difference between active infestation and old damage that is no longer moving, and where needed we can recommend further specialist investigation.

Roof defects are also common, particularly where older homes have scantle slate roofs. We regularly find slipped or broken slates, deteriorating mortar on ridge tiles, and chimney stacks that have been repaired badly over the years. Many Mawnan homes still have original slate roofs that are now well over 100 years old, and although they can keep performing well, they increasingly need maintenance and repair. Our reports will flag any current or possible roof issues so you can plan for the work ahead.

Structural movement and cracking do turn up from time to time in older properties, especially those built on traditional rubble stone foundations that may have settled unevenly over centuries. Our surveyors are trained to separate the minor age-related movement that is common in historic buildings from the more serious sort of structural issue that needs swift attention. We explain the significance of any movement we see and, where appropriate, recommend input from a structural engineer.