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Foundation subsidence

What is foundation subsidence?

Footings and foundations aren’t necessarily the first elements of a house that you think will have problems. It’s usually the cosmetic issues, such as interior wear and tear, that are obvious and which you expect to maintain.

But when it comes to potential problems with a house or other building, they don’t get much worse than sinking foundations, especially if not identified quickly or treated correctly.

Foundation subsidence occurs when weak ground cannot support the weight of structures or floors above it and can cause major property hazards.

There are many natural and human-made reasons for weak ground. Loosely packed or sandy soils, or even activities such as excavating and drilling, can cause ground subsidence issues.

Over the last decade, foundation subsidence has cost the UK economy billions of pounds, making it the most damaging geo-hazard in Britain today. It is expected to affect as many as one in five homes in England and Wales in the coming years.

What are the likely signs of foundation subsidence?

Subsidence, which is the gradual downward movement or sinking of an area of land, results in your home moving, sinking in one area or across the entire foundation footprint.

The first signs of foundation subsidence usually include:

  • Sinking floors
  • Cracks in walls, paths and driveways
  • Jammed windows and doors

With Mainmark’s range of cost-effective, non-invasive subsidence repair solutions, we can work with you to make the rectification process less stressful, assessing damage, fixing the ground and allowing you to live happily in your home again.


What are the causes of foundation subsidence?

Some homes are at a greater risk than others when it comes to ground sinking or subsidence. There are also many geological, human-made and seasonal factors that can make your home more likely to need foundation repair:

• Clay soil can shrink, crack and shift during hot weather and then expand during wet weather
• After a drought, sandy or fine gravel soil is much drier and moves more easily, which can impact the building’s footing
• Trees and shrub roots can also be a factor, particularly if they’re close to a property’s foundations
• Leaking drains and water mains can wash away or soften the soil, causing it to compact under the foundation’s weight
• Flood water saturates the ground, causing ground movement and the house foundations to sink or move
• Vibrations caused by heavy road traffic, machinery or nearby excavation can cause changes in the soil under your home
• Local mining activity can cause ground instability and voids
• Liquid, gas or mineral resources being removed from the ground affects stability, causing voids and sinkholes
• Other natural causes, including erosion and earthquakes, can affect ground stability
Older properties may have shallower footings or foundations


Fast, cost-effective and non-invasive solutions to treat foundation subsidence


Mainmark technologies for foundation subsidence remediation

Teretek® – Foundation subsidence remediation through resin injection

With over 25 years of experience, Mainmark is a world leader in resin injection solutions. Teretek® uses an injection delivery method that raises, re-levels and re-supports buildings and other above-ground structures and remediates foundation subsidence.

Teretek® resin injection technology

Foundation subsidence remediation with JOG Computer-Controlled Grouting

JOG Computer-Controlled Grouting is an award-winning technology for strengthening weak ground beneath larger residential buildings and other structures, using a cement grout injected under computer control. It is an extremely precise method for the remediation of foundation subsidence, improving and consolidating weak ground and lifting foundations to deliver specific, engineered outcomes, regardless of complexity.

JOG Computer-Controlled Grouting

Mainmark technology benefits

Benefits of Mainmark’s foundation subsidence treatments


Our foundation subsidence treatments have fast curing times. Treated areas can be used quickly, without the delays associated with traditional repair methods.

Environmentally inert

Our foundation subsidence treatments use an inert material that is non-toxic and does not leach into the environment or affect the treated area.


Our foundation subsidence treatments are surgical in nature compared to traditional methods.


Compared to traditional methods, our foundation subsidence technologies are more cost-effective and cause minimal disruption to the area.


We’re happy to have helped

Foundation subsidence FAQs
What happens uneven or sunken floors?

After the application of the Mainmark solution, sunken floors will become raised and re-aligned as the ground underneath is strengthened and re-supported. Simple cosmetic repairs may be required.

Will there be a mess?

With Mainmark’s methods, there will be very little, if any mess. We use Teretek® engineered resin injection technology, which is likened to keyhole surgery, or JOG Computer-Controlled Grouting, which requires no major excavation and causes minimal disruption or mess. The required injection holes are very small.

How long does it take?

Each project is different, and the length of time will depend on the required amount of lift, the size of the area needing correction, building construction methods and ground conditions. Most projects can be completed in a day or two, and we can work at times that suit you.

Do I need to vacate my property?

No, most projects don’t require you to vacate your home or even move furniture. For the most part, your day-to-day life can continue as normal with minimal disruption.

What warranty will I get?

The materials we use have been developed for use underground and have been specifically engineered to resist shrinkage and deterioration. Teretek® is warranted by Mainmark for an industry-leading period of 50 years.

Is it safe and environmentally friendly?

Injected Teretek® and JOG Computer-Controlled Grouting materials are environmentally inert and have no detrimental effects on the environment.

Get a quote

Arrange a site assessment in three simple steps:

Step 1

Submit your enquiry using our online form. Include a brief message about the type of foundation issues you are experiencing.

Step 2

Our friendly customer service team will be in touch to schedule a site assessment that suits you.

Step 3

One of Mainmark’s experts will visit your home or property, assess the damage and determine the likely cause. They will establish the approach needed, create a plan specific to the needs of your building and provide you with a detailed quote.

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