RICS Level 3 Building Survey Itchen Valley

The Itchen Valley presents unique challenges for property buyers that make a RICS Level 3 Survey particularly valuable. The geology of the area, characterised by Upper Chalk with superficial deposits of clay, sands, and gravels overlying the chalk on the valley floor, creates potential shrink-swell risks. Properties in areas such as Itchen Wood, where clay overlies the chalk, may be susceptible to ground movement due to changes in soil moisture content. Our inspectors are trained to identify the signs of such movement and assess its implications for the property's structural integrity.

The valley's proximity to the River Itchen and its tributaries means that flood risk is a genuine concern for properties in villages like Ovington, Itchen Abbas, and Abbots Worthy. Both river flooding and groundwater flooding have been experienced in the area, with high groundwater levels in West, North, and Central Hampshire leading to flooding of cellars and land. Our surveys include thorough assessments of flood risk and any existing flood damage that may have affected the property. We examine the condition of drainage systems, which is particularly important given that many properties in Itchen Abbas do not have mains drainage and rely on individual disposal systems that could potentially impact the river.

Many properties in the Itchen Valley are listed buildings or situated within conservation areas. Abbey House in Itchen Abbas, dating from 1693, St. John the Baptist Church, and Martyr Worthy Place are all Grade II listed properties that exemplify the heritage character of the area. Understanding the implications of listed building status and any alterations that may have been carried out without proper consent is a crucial part of our survey process. The Itchen Valley Village Design Statement, adopted by Winchester City Council as supplementary planning guidance, influences development in the area, and our surveyors understand how these planning constraints may affect future renovation plans.

The age profile of properties in the valley further underscores the need for detailed surveying. Itchen Abbas alone contains numerous properties from the 17th century, including Abbey House, The Old House, Old Post Cottage, and Bignell's Cottage, alongside 18th-century properties such as Mill Cottages and Manor Farm. These historic buildings often have non-standard construction methods and traditional breathable fabric that behaves very differently from modern construction, requiring expert assessment.

• Identification of structural movement and subsidence risk
• Assessment of flood risk and drainage issues
• Evaluation of historic building fabric and construction
• Identification of damp, rot, and timber decay
• Review of any unapproved alterations or extensions

Our experience surveying properties across the Itchen Valley has identified several recurring issues that buyers should be aware of. Dampness is among the most common problems we encounter, particularly in period properties where rising damp, penetrating damp, and condensation can all cause issues. These problems often stem from poor ventilation, leaking roofs, defective weatherproofing, or failed damp-proof courses. The presence of thatched roofs on some properties, while beautiful, can present specific challenges in terms of maintenance and condition assessment. Our surveyors know what to look for when inspecting these traditional features.

Roof defects are another frequent finding in our surveys. Slipped or broken tiles, failing lead flashing, sagging roof structures, and chimney deterioration are all common issues, particularly given the exposure of properties in the valley to weather conditions. Many properties in the area have dormer windows, which require careful inspection as they can be prone to leaks and associated timber decay. Flat roofs, where present, also require thorough assessment as membrane failure is a common problem. Given that properties in the valley range from 17th-century buildings to more recent constructions, our surveyors adapt their inspection approach to account for the various roof types and materials encountered.

Structural movement, while sometimes benign, can indicate more serious foundation issues. In the Itchen Valley, this can be related to the shrink-swell behaviour of clay soils, particularly during periods of extreme weather. Our surveyors are trained to identify the signs of structural movement, including cracks in walls, tilting chimney stacks, and gaps where walls meet floors, and to assess whether such movement is active or historical. This is particularly relevant for properties built on the clay-rich superficial deposits that overlie the chalk in parts of the valley.

Drainage issues are also commonly identified in our Itchen Valley surveys. The combination of clay soils, which have poor drainage characteristics, and the valley's proximity to the River Itchen can lead to problems with surface water runoff and subsoil water accumulation. We inspect all visible drainage pipework, inspection chambers, and outflow points, noting any signs of blockages, damage, or inadequate fall that could lead to future problems. For properties with septic tanks or private drainage systems, which are common in the more rural parts of the valley, we will note their condition and location, though we do not carry out a drainage connectivity test.

• Roof defects including slipped tiles and chimney issues
• Damp and condensation problems
• Structural movement and subsidence
• Defective drainage and water penetration
• Timber decay and woodworm infestation
• Open joints and spalling brickwork

While the Itchen Valley is predominantly characterised by older period properties, there has been some new build activity in the area that may be of interest to buyers. A farmyard redevelopment north of Easton and west of Martyr Worthy is converting two existing barns into residential dwellings, including a five-bedroom and a three-bedroom property, alongside the construction of four new dwellings including semi-detached and detached properties. At Wickham Fields in nearby Twyford, which is often associated with the broader Itchen Valley area, new detached and semi-detached homes are being offered by Alfred Homes. An individual bungalow was also granted planning consent in October 2024 in Itchen Abbas, representing a small but notable addition to the local housing stock.

Even for new build properties in the Itchen Valley, a RICS Level 3 Survey can be valuable. While such properties may benefit from the latest building regulations, our survey can identify any construction defects, issues with the quality of workmanship, or problems arising from the conversion of historic barns that may not be immediately apparent. For barn conversions specifically, our surveyors pay attention to the integrity of the converted structure, the condition of any new structural elements, and the effectiveness of insulation and ventilation that has been installed within the historic building fabric.

For those purchasing new builds in the area, we also offer snagging inspections to ensure your property is finished to the expected standard. These inspections are particularly valuable for new properties where defects may not be immediately visible but could develop into significant issues over time. Our snagging inspections cover everything from cosmetic defects to more serious issues with windows, doors, plumbing, and electrical installations, providing you with a comprehensive list of items that require attention from the developer.