RICS Level 3 Building Survey in Boston

Boston presents unique challenges for property buyers that make a RICS Level 3 Survey particularly valuable. The town sits entirely within a floodplain, with a well-documented history of tidal and river flooding that has affected hundreds of properties. While the Boston Barrier Scheme completed in 2020 provides enhanced tidal protection for over 13,500 homes and businesses, the underlying risk from the River Witham, surface water, and groundwater remains significant. Our inspectors assess flood resilience measures, check for signs of previous water damage, and evaluate drainage systems around the property. This is especially important for properties in low-lying areas near the river or the various drainage channels including the Maud Foster Drain and the North and South Forty Foot Drains that crisscross the region. We have surveyed properties that experienced flooding in the January 2025 severe weather event, giving us specific insight into the types of damage buyers should look for.

The local geology presents another critical consideration for Boston property buyers. The underlying ground consists of fine-grained tidal flat deposits and organic peats, which are highly susceptible to clay shrink-swell movement. The British Geological Survey GeoSure data confirms this hazard in the Boston area, where variations in ground moisture, particularly in the upper two metres, can affect building foundations. This means properties, particularly older ones with shallow foundations, can experience subsidence as soil moisture levels change during dry periods when trees draw moisture from the soil. Our surveyors specifically examine walls, floors, and foundations for signs of movement, cracking, or settlement that may indicate foundation problems. We have identified numerous properties in areas like Wyberton and Fishtoft where foundation movement has occurred due to these soil conditions.

With approximately 53.5% of properties in Boston being detached homes and a significant proportion built before 1930, many properties feature traditional construction methods that differ substantially from modern buildings. These include solid wall construction, timber-framed structures sometimes hidden behind later facades, and traditional roof structures using imported slate or local materials. Our Level 3 surveys thoroughly evaluate these elements, identifying deterioration, rot, insect damage, and structural deficiencies that might not be apparent to untrained eyes. For the 226 listed buildings within Boston's conservation area, we also provide guidance on the additional considerations required for historic properties, including advice on listed building consent requirements and potential issues arising from past incompatible repairs using modern materials.

Boston's economy includes significant employers in the agri-food sector, which accounts for 29% of local jobs, attracting workers from both within the UK and internationally. This has contributed to population growth and housing demand, with new developments expanding in villages like Wyberton, Frampton, and Kirton. While new build properties may seem straightforward, our surveyors frequently identify snagging issues and construction defects in recently built homes that benefit from professional inspection. Properties in developments like Heron Park and The Quadrant often have defects that are not immediately obvious to buyers but can be costly to rectify.

• Flood risk assessment
• Foundation and subsidence evaluation
• Traditional construction inspection
• Listed building considerations
• New build snagging inspection

Boston's housing mix is predominantly detached properties, comprising 53.5% of the market, with semi-detached homes at 21.8% and terraced properties at 21.5%. Flats and maisonettes make up only 3.2% of the market. This mix means many buyers are purchasing larger properties where structural issues can be more costly to rectify. The town's architectural heritage includes medieval timber-framed buildings, Georgian townhouses along High Street and Wide Bargate, Victorian terraces, and modern developments that are expanding the town's boundaries. Understanding this diversity is essential when assessing a property, as each era brings its own common defect patterns.

For properties in the Boston Town Centre Conservation Area, which covers 69.30 hectares and contains 226 listed buildings, additional considerations apply. These range from the famous St Botolph's Church (known as 'The Stump') to the 15th-century Shodfriars Hall and the early brick St Mary's Guildhall, one of Lincolnshire's earliest brick buildings dating to around 1390. Our surveyors understand the special requirements for listed buildings and can advise on how structural issues may affect, or be affected by, the property's listed status. We can also identify potential issues arising from past incompatible repairs using modern materials that may have caused damage to historic fabric, a problem we have observed in several historic properties throughout the town.

The local construction materials reflect Boston's history and geography. Traditional red brick, often made from local clay deposits, dominates older properties, with notable examples including St Mary's Guildhall and the Old King's Head in Kirton. Many historic buildings feature timber frames sometimes hidden behind later brick facades, particularly in buildings from the medieval and Georgian periods. Lincolnshire Limestone was used in significant structures, while imported slate covered Victorian roofs. Understanding these materials helps our surveyors identify appropriate repair approaches that maintain the building's historic character while addressing structural concerns. We have seen properties where inappropriate modern repairs have caused significant damage to historic fabric, highlighting the importance of specialist knowledge.

Our inspectors frequently encounter specific defect patterns in Boston properties that reflect the local geology, climate, and housing stock. The clay shrink-swell movement caused by the underlying tidal flat deposits and organic peats is a major concern, particularly for older properties with shallow foundations. We regularly identify cracking to walls, uneven floors, and signs of settlement that indicate foundation movement. Properties with nearby trees, particularly those in dry summers, are especially vulnerable as tree roots draw moisture from the soil, exacerbating the shrink-swell effect. This type of movement is particularly common in properties throughout Fishtoft and the older parts of Wyberton.

Flood-related defects are another significant finding in Boston surveys. Despite the Boston Barrier Scheme, properties throughout the town can be affected by flooding from various sources. Our surveyors look for signs of previous water damage including tide marks, damp staining, warped floorboards, and damaged plaster. We assess the condition of existing flood resilience measures and provide recommendations for improvements where appropriate. Properties we have surveyed following the January 2025 flooding event showed specific patterns of damage that buyers should be particularly aware of, including damage to electrics, plaster deterioration, and structural timber issues.

For historic properties, particularly those in the conservation area, we commonly identify defects related to the original construction methods and materials. These include deterioration of timber-framed elements, both visible and hidden behind later claddings, rot in floor joists and roof timbers, and issues with traditional lime mortar pointing that has been replaced with inappropriate cement mortars. We also see problems with historic windows and doors that have been poorly repaired or replaced with inappropriate modern alternatives that detract from the building's character and may cause moisture problems. The condition of listed buildings varies considerably, with some having been well-maintained and others suffering from neglect that has led to significant structural problems requiring substantial investment.

In newer properties, particularly those in the large developments around Boston, we commonly identify defects related to building quality and workmanship. These range from minor cosmetic issues to more significant problems with structural elements, waterproofing, and thermal performance. Our detailed inspections have identified issues with roof structures, window installations, damp proof courses, and insulation that would not be apparent to buyers without professional survey experience. Given the scale of development in areas like Wyberton and Frampton, these issues affect a significant number of properties.