RICS Level 3 Building Survey in Nelson

Nelson’s older homes are a big reason we often suggest a RICS Level 3 Survey here. As a former mill town in Lancashire, it has a dense stock of terraced and semi-detached houses built between 1850 and 1910, originally put up for workers from the local cotton mills. Those buildings usually rely on traditional methods rather than anything close to current standards, with local stone and red brick commonly used and solid walls instead of the cavity insulation found in newer homes.

Across Nelson, our inspectors regularly come across problems that are typical of this older housing, such as weathered stonework, historic timber frame sections, and electrical and plumbing installations that are well past modern expectations. A fair number of these properties have seen very little upgrading since first being built, so buyers can end up taking on sizeable repair costs unless the condition is properly understood in advance. Age, original materials and, in some cases, patchy maintenance all give defects plenty of time to develop.

The setting matters too. Nelson sits within former coal mining territory, so some homes may have been affected by past mining activity, with subsidence not always obvious at first glance. Local geology is another factor, because clay-rich soils can shrink and swell during drought or periods of excessive rainfall. We look at these risks as part of the survey and, where needed, set out recommendations for further checks.

For properties in Nelson, we recommend a RICS Level 3 Survey across the board, especially where the building is pre-1900, has been heavily altered, or sits in an area known for mining activity. The report gives you the detail needed to make a properly informed decision on the purchase, or to negotiate suitable repairs with the seller.

• Victorian terraced houses
• Pre-1900 period properties
• Properties with visible cracking
• Homes near former mining areas
• Properties with significant alterations
• Listed buildings in conservation areas

Once you understand how much of Nelson was built, the recurring defects make more sense. Most terraced houses here use traditional solid wall construction, usually with walls around 225mm to 300mm thick in local stone or red brick. They were commonly built with lime-based mortars, which help the structure breathe but can break down with age and need a different repair approach from modern cement-based pointing.

In many of Nelson’s older houses, the roof is formed with timber rafter construction and finished in slate or clay tile. Plenty of original slate coverings from the Victorian and Edwardian periods still survive, even though some are now close to, or beyond, an expected lifespan of 80-100 years. During inspection we look carefully for slipped tiles, worn ridge pointing, damaged flashing and the state of any flat roof areas over extensions.

Pre-war homes in Nelson often have suspended timber ground floors over ventilated voids, and that can bring its own trouble. Rot and woodworm are more likely where subfloor ventilation is poor or blocked altogether. Where access allows, our surveyors inspect these underfloor spaces for timber decay, fungal growth and signs that water has got in at some point.

By the 1920s, cavity wall construction had become more common in Nelson, although many semi-detached and detached homes from the post-war years still have only limited insulation. Knowing whether a house has solid walls or cavity walls matters when judging suitable energy efficiency upgrades and the right way to deal with damp. We cover both points in the report with advice that fits the property type.

After surveying homes across Nelson, we see the same concerns crop up time and again. Damp is one of the most common, especially in older terraced houses with solid walls and poor ventilation. Rising damp often shows at ground floor level, while penetrating damp is frequently linked to failed pointing, leaking gutters or missing roof tiles. Because so many Victorian and Edwardian properties in Nelson were built with solid walls rather than a cavity, keeping damp under control matters a great deal.

Roof defects are another regular issue. A large number of Nelson properties still have their original slate roofs and, although these suit the age and character of the buildings, many are now near or beyond their expected lifespan. We check for slipped tiles, deteriorated flashing, damaged ridge tiles and the condition of any flat roof sections. Left alone, those faults can let in a lot of water and lead to damage in plaster and timber inside the house.

We also frequently identify timber problems in Nelson homes, particularly wet rot and dry rot affecting window frames, door frames and structural timber. The mix of age, past damp and sometimes poor ventilation creates the right conditions for decay to take hold. Our surveyors inspect suspect timber visually and, where required, recommend a specialist damp and timber survey so the full extent of the problem and the necessary repairs can be properly assessed.

Now and then we find signs of structural movement in Nelson properties, including cracking to walls, sticking doors and uneven floors. Some movement may be relatively minor for a building of this age, but we still assess the likely cause and seriousness carefully and say whether structural repair or extra investigation is needed. Former mining areas need close attention, because historic mining activity can lead to ground movement, cracking and subsidence.

• Rising and penetrating damp
• Roof tile deterioration
• Wet and dry rot
• Structural cracking
• Outdated electrical systems
• Inadequate insulation
• Defective guttering and drainage
• Subfloor ventilation issues