RICS Level 3 Building Survey London

A RICS Level 3 Building Survey is the most detailed residential survey available through Homemove. Our surveyors inspect all accessible parts of the property and give you a written opinion on construction, materials, visible defects, condition, repairs and maintenance priorities. In London, that often means checking the roof from the loft hatch, the floors where access allows, the external walls, rainwater goods, chimneys, windows and any extensions added to the original house on streets such as Blackstock Road, Bayswater Road or around the Thames-side terraces in SE1.

The report does not stop at description. It explains what a defect could mean if left alone, how serious it is likely to be, and what sort of work may be needed next. That matters where lime mortar has been replaced with hard cement, where a bay window shows signs of cracking on an Edwardian terrace, or where old timber has decayed after years of trapped moisture in a basement off the North Circular. Buyers pay for a Level 3 because they want more than a list of issues, they want context that helps them decide what to do with the property.

There are limits to a survey, and ours are stated plainly. We do not carry out destructive opening-up, we do not lift fitted carpets, we do not run drainage CCTV, and we do not test services in the way a specialist contractor would. If we see a sign that points to a deeper problem, such as movement, hidden damp or an ageing consumer unit, our report will recommend the right follow-up, which may be a structural engineer, damp specialist, electrician, gas engineer or drainage company. That is usually where the buyer's next decision starts.

• Loft and roof structure inspection where safely accessible
• Sub-floor, visible joists and signs of damp or decay
• External walls, windows, chimneys and rainwater goods
• Accessible services and obvious signs of wear, alteration or repair

London is not one construction story. Georgian terraces in Bloomsbury, Victorian houses in Stoke Newington and 1930s semis in outer boroughs all behave differently, because they were built with different materials and on different ground. London Stock brick, Portland stone, ragstone, elm, oak and later concrete all appear across the city, and some repairs have been carried out badly, especially where hard cement has been used against old lime mortar. A Level 3 survey is valuable here because it can read those clues in context rather than treating every crack the same way.

The ground matters just as much as the walls. London sits in the London Basin, with Chalk below and London Clay above, and that clay is highly shrinkable. One in 50 houses in London and the South East has suffered from subsidence, and the highest shrink-swell clay hazard in the country sits here, with South-East London, NW, N and W postcode areas often mentioned as higher risk zones. On Victorian and Edwardian homes with shallow foundations, a summer of dry weather can show up as sticking doors, diagonal cracks or a bay window that no longer sits quite right.

Flooding is another London issue that a Level 3 survey can help to frame. Fifteen percent of London is in a floodplain, and surface water flooding is the main risk, with almost 320,000 homes at high risk and 1 in 8 homes in the city in high-risk surface water zones. East London, including parts of Tower Hamlets, Newham and Hackney, has former marshland in the mix, while basements across the centre and west can suffer deep internal flooding even when the street looks fine. Victorian drainage systems, hard paving and heavier rain make that worse.

• Victorian damp and cellar moisture in older terraces
• Edwardian bay-window settlement and cracking
• 1930s solid-floor and roof wear on interwar stock
• 1960s flat-roof and concrete deterioration on post-war homes