RICS Level 3 Building Survey in PA60 Isle of Gigha

A RICS Level 3 Building Survey is the fullest residential survey available in the UK. It goes well beyond a basic assessment, looking closely at the property's construction, overall condition, and any serious defects that may need attention now or later. On the Isle of Gigha, that extra detail matters, not least because the island has a mix of traditional buildings and older housing stock that has needed extensive renovation work over the past two decades.

On Gigha, many homes were built using traditional methods and local materials from the island's small quarry, and since 2002 the Isle of Gigha Heritage Trust has done substantial work to bring cottages up to tolerable standards. We know these construction types well and can spot problems that are easy to miss if you are not familiar with older island buildings. Our survey covers walls, floors, roofs, foundations and the full range of structural elements, so we can give a clear picture before you commit to a purchase. That includes assessing solid stone walls, traditional lime mortar pointing and the particular maintenance issues that come with older island properties.

Gigha properties have to contend with conditions that are not found everywhere, including coastal weather exposure, salt air corrosion and possible flooding in low-lying parts of the island. We address those local risks directly in our Level 3 survey, looking at how the building and its site may be affected by sea-level rise projections for the Firth of Clyde and by the island's coastal setting. Where work is needed, we set out practical recommendations to help protect your investment against the environmental conditions found on Gigha.

Gigha's geology is unusual and relevant to property condition. The island sits on ocean floor sediments compressed by continental movement, and volcanic activity around 40 million years ago formed distinctive dykes running through older rock formations. We take those geological conditions into account when considering foundation performance and drainage behaviour in different parts of the island.

• Thorough structural inspection of all load-bearing elements
• Detailed assessment of roof condition and drainage
• Identification of damp, rot, and timber defects
• Evaluation of thermal efficiency and insulation
• Flood risk assessment specific to coastal location
• Recognition of traditional building methods and materials

The Isle of Gigha's location in the Firth of Clyde brings property issues of its own. Coastal flooding is one of them, with UKCP09 data indicating a sea-level rise of approximately 0.47 metres by 2080 under high-emission scenarios. We examine the property's exposure to flood risk by considering elevation, drainage arrangements and how close it sits to areas marked on SEPA flood maps. In lower-lying locations in particular, we assess whether the existing drainage is suitable for both current conditions and what is projected ahead.

Because the island is exposed to the Atlantic, buildings here have to cope with strong wind loading and salt-air corrosion. Traditional Gigha properties, often built with local stone and materials from the island's small quarry, can be very solid but also fairly rigid, which means cracking can develop with age. We understand how these structures typically perform, and we can separate normal ageing from defects that call for action. Roof structures get special attention, as they take the full force of Atlantic weather systems.

There is also coastal erosion to think about, especially for properties with exposed coastal frontages. The main settled parts of the island do benefit from protection measures, but it is still important to understand the risk profile of an individual property when planning maintenance. The Sound of Gigha Special Protection Area is a reminder of how strongly the marine environment shapes the island, with tidal currents and changing depths influencing the coastline. For homes near the shore, ongoing erosion risk may need to be factored into both the purchase decision and long-term upkeep.

Gigha's community wind turbines have been running since 2005, and the four turbines produce approximately two-thirds of the island's electricity needs. That does not directly affect the structural condition of a property, but we are mindful of the wider local setting and the way community infrastructure can influence area character and, in some cases, property values. Our focus stays on the building itself, while still recognising the island's distinctive context.

• Coastal flood risk assessment
• Wind exposure evaluation
• Salt corrosion identification
• Drainage system inspection
• Foundation condition check
• Traditional material assessment

Over time, we have seen recurring defect patterns in Gigha properties that reflect both the island environment and its building history. Many cottages bought by the Isle of Gigha Heritage Trust in 2002 were described as "below tolerable standard" or "in serious disrepair", which points to longstanding maintenance pressures that can still show up in older homes today. Knowing about those common issues helps when planning budgets for ongoing maintenance and setting priorities for remedial work.

One of the issues we most often find is deterioration in stone walls. As traditional lime mortar pointing breaks down, water can get in and lead to damp problems internally, and on Gigha that process can move faster because of the salty coastal air. We identify where repointing is needed, assess the condition of solid stone walls and recommend repair methods that preserve breathability while still improving weather protection.

Roof problems are common here. Atlantic weather exposure often leaves us finding slipped or missing slates, worn ridge pointing and corrosion in lead flashings and valley gutters. Strong winds combined with salt-laden air can shorten the life of roofing materials, so our survey sets out the condition of the roof in detail, together with likely remaining lifespan and any repairs that need urgent attention.

Damp and condensation are frequent concerns in Gigha properties, particularly where modern insulation has been introduced during renovation. Traditional buildings were meant to breathe, and unsuitable insulation upgrades can trap moisture within the fabric. We check whether ventilation is sufficient, look for signs of penetrating damp and recommend solutions aimed at the actual cause rather than the visible symptoms alone.

Some properties are especially well suited to the depth of a Level 3 survey. Homes built before 1900 often rely on traditional construction methods that need experienced assessment, and we know how to inspect them without causing damage through inappropriate intrusive investigation. Our approach follows industry best practice while keeping a close eye on the older construction types that are so common on Gigha.

Listed buildings on Gigha need careful handling during survey work, including examples such as the Category B listed Gigha Hotel. We have experience of inspecting historic buildings and understand the effect that alterations can have on listed status. We identify unauthorized changes, then give practical guidance on maintenance that protects historic character while still addressing structural concerns. It also helps to know what counts as an acceptable repair method for a listed building before planning future work.

Homes that have seen major renovation or extension work are another strong case for a detailed Level 3 assessment. The Isle of Gigha Heritage Trust has renovated many properties over the years, and understanding how those improvements were carried out can reveal possible issues linked to structural alterations. We review the quality of earlier work and consider whether it meets current building standards. We also check that extensions and conversions have been built properly and do not weaken the original structure.

Even newer homes can benefit from a Level 3 assessment, including the affordable homes being built by the Heritage Trust and the 11 plots sold for private development. Although they are usually in better condition than older properties, a full survey still helps verify construction quality. It can also pick up snagging issues that should be dealt with before warranty periods expire.