Subsidence 

We provide premium underpinning and crack stitching as a result of various signs of subsidence, such as ​cracks in the walls, ceilings, outside brickwork​ and more.

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What is subsidence?

One of our key areas of work lies in repair issues as a result of subsidence and movement. Subsidence occurs when the ground underneath your home sinks and causes the building foundations to move downwards. We provide premium underpinning and crack stitching as a result of various signs of subsidence, such as ​cracks in the walls, ceilings, outside brickwork​ and more.

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Signs of subsidence

The signs of subsidence can be identified in many varied ways. This can be internal and external cracking,uneven floors, doors and windows failing to close properly as well as walls moving.

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Causes of subsidence

Ground movement types come in four forms: ​heave, landslip, settlement and subsidence​. Subsidence in particular has a number of causes, some of which being broken drains, root damage, expansion of pre-existing cracks, excessive amount of soil in drains, insufficient depth of existing foundations, dry conditions causing ground movement or extension overload with weak foundations.

The UK is especially prone to homes facing subsidence and movement, which is characterised by variable rainfall, hot and extremely cold weather – with ​1 in 50​ London homes being subject to the issue

Subsidence repair solutions

Subsidence can be managed by ​underpinning – a highly specialised method which strengthens below ground level to solidify foundations of a building. Underpinning can be performed on current or previously existing subsidence in order to prevent further movement. Although it can be a lengthy and costly process, it will secure the building in position by digging holes beneath the existing foundations and filling them with concrete. The treatment lasts for generations and locks everything into place.

Resin ground stabilisation​ can also be used to treat building movement. Soil injection is a method used to solidify existing soil beneath your home, through a combination of silicate, polyurethane, and special binders which are injected into the substrate. Their high-strength properties provide super strong and reliable stability for properties of all types.

Crack stitching​ is another great option for cracks as a result of subsidence exceeding 3mm. The process involves the use of a large grout gun which is placed carefully in between the gaps of a wall, followed by stitching rods and cement work to fully seal and finalise the treatment. This will help strengthen the wall, prevent further movement or sinkage, and protect against penetrating damp.

What properties are most at risk of subsidence?

There are numerous factors which impact what types of properties are affected by subsidence. Some examples being:

  • Trees: ​drains moisture from the soil beneath your home
  • Property aging:​ period properties with shallow and insufficient foundations
  • Dry climate: ​hot climates drying up the soil
  • Leaks:​ causing washaway and sinkage of soil

If you have plans to add a new story or extension to your home, it is absolutely essential to underpin the foundations to support the extra weight. Subsidence cases can be extremely complex, requiring expert help, evidence and data to fully analyse the process and plan the best course of action for your property.

Call: 0300 030 1822

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Subsidence FAQs

We’re here to help! Here you’ll find the answers to the questions we get asked the most about subsidence. If you would like to know more, get in touch for a free consultation.

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    How much does subsidence cost to repair?

    The repair costs of subsidence depend on many factors. These would include the type of underpinning undertaken to rectify the problem, whether it is traditional mass concrete underpinning or resin injection. The costs though would typically start from £550.00 per linear metre.

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    How much does subsidence devalue a property?

    If underpinning is undertaken to the correct procedures with the correct structural calculations and building control consents, it is unlikely to have a negative impact on the property value.

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    How do I check for subsidence in my house?

    It is fairly straightforward to identify subsidence. This would be by identifying visual cracking or doors or windows failing to close correctly along with the floors sloping.

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