Subsidence refers to the sinking or settling of a structure, typically a house, into the ground. This can occur for a variety of reasons and can lead to significant damage to a home if left unchecked. In this article, we will explore the causes of subsidence, how to spot the signs of subsidence, and what to do if you suspect that your home is experiencing subsidence. We will also discuss the potential effects of subsidence on the value of your home and your insurance costs, as well as the typical costs associated with repairing subsidence damage.
Causes of subsidence
There are several potential causes of subsidence in homes. Some of the most common include:
- Soil type: The type of soil that your home is built on can play a significant role in the likelihood of subsidence. Clay soils, in particular, are prone to shrinking and swelling as they absorb and lose moisture, which can cause a home to sink or settle.
- Drought: A prolonged period of drought can lead to soil shrinkage, which can cause subsidence.
- Tree roots: Large trees with extensive root systems can cause subsidence if their roots grow under the foundation of a house and start to lift or destabilise it.
- Leaking pipes: A leak in a water pipe beneath a foundation can cause the soil to become saturated and start to sink or settle.
- Mining or drilling: If a home is built over an old mine or on top of an oil or gas well, it can be at risk of subsidence due to underground activity.
How to spot the signs of subsidence
There are several signs that you can look out for if you suspect that your home may be experiencing subsidence. These include:
- Cracks in walls or foundations: One of the most obvious signs of subsidence is the appearance of cracks in walls, foundations, or flooring. These cracks may start out small but can grow larger over time if left unchecked.
- Uneven or sloping floors: If your floors feel uneven or sloped, it could be a sign of subsidence.
- Doors or windows that no longer fit properly: If your doors or windows start to stick or become difficult to open and close, it could be due to subsidence.
- Gaps between walls and ceilings or floors: If you notice gaps appearing between walls and ceilings or floors, it could be a sign of subsidence.
- Bulging or leaning walls: If your walls start to bulge or lean, it could be a sign of subsidence.
What to do about subsidence
If you suspect that your home may be experiencing subsidence, it is important to address the issue as soon as possible. The first step is to contact a structural engineer or a qualified foundation repair contractor to assess the damage and determine the cause of the subsidence. They will be able to recommend the appropriate course of action, which may include stabilising the foundation, injecting grout or other materials to fill voids or stabilise the soil, or installing piers or other support structures to lift and stabilise the foundation.
The cost of repairing a home that has experienced subsidence will depend on the severity of the damage and the extent of the repairs needed. In general, the cost of repairs can range from a few thousand pounds to tens of thousands of pounds, depending on the complexity of the work. For example, the cost of injecting grout to stabilise the soil beneath a foundation may range from £100 to |£200 per linear metre, while the cost of installing piers or other support structures can range from £1,000 to £10,000 or more per linear metre.
It is important to note that the cost of repairing subsidence can vary significantly depending on the location of the home, the local cost of labor and materials, and other factors. In addition, some homeowners insurance policies may cover the cost of subsidence repairs, while others may not. It is always a good idea to check with your insurance company to see if subsidence damage is covered under your policy.
In conclusion, subsidence is a serious issue that can cause significant damage to homes and other structures. If you suspect that your home may be experiencing subsidence, it is important to address the issue as soon as possible to minimise the extent of the damage and prevent further deterioration. By working with a qualified structural engineer or foundation repair contractor, you can determine the cause of the subsidence and take the necessary steps to repair and stabilise your home. The cost of repairing a home that has experienced subsidence will depend on the severity of the damage and the extent of the repairs needed, but it is always a good idea to consult with your insurance company to see if the damage is covered under your policy.