
Extension subsidence
At the heart of our journey lies the trust of thousands of businesses worldwide, reflected in the numbers that drive us forward.
Are you concerned about extension subsidence in your home?

Extension subsidence is a problem that should not be ignored. If you suspect your home is experiencing subsidence, it’s important to consult with professionals right away to prevent further damage.
Extension subsidence typically occurs due to problems with the soil under your home’s foundations. As experts in dealing with subsidence in residential homes, Mainmark offers solutions that deal with the root cause of the extension subsidence, getting your home back to normal as soon as possible.
Common causes of extension subsidence include:
Inadequate foundation – If an extension’s foundation is not properly designed or constructed
Shrinkage or erosion of soil – Often caused by flooding or prolonged dry spells, which cause soil to lose moisture
Historic land use – Such as mining or fracking
Mainmark’s extension subsidence solutions, Teretek® resin injection technology, and JOG computer-controlled grouting, are quick, reliable and cost-effective. Work can usually be completed in about a day, causing minimal disruption to your family and allowing you to rest assured that your extension is safe, stable and on solid ground.
The signs of extension subsidence

If left untreated, the problems associated with extension subsidence can become exacerbated, causing more damage, and possibly requiring the extension to be demolished or rebuilt. Knowing the signs of extension subsidence can help you spot problems early and get help before further complications arise.
A common sign of extension subsidence is the noticeable separation between the extension and the main house structure. This will appear as cracks in the internal or external walls where the extension meets the house. As well as being a clear sign of extension subsidence, this separation can be a safety hazard, it can cause draughts and it may allow rainwater and other moisture to get into your walls.
Other potential signs of extension subsidence include:
Cracks in walls, floors or ceilings
Doors and windows that stick or don’t close properly
Sloped, sinking or otherwise uneven floors
Unexplained ripples or creases in wallpaper
Leaning of the extension
By recognising these signs and taking prompt action, you can mitigate the impact of extension subsidence, ensuring the safety of your home and preventing more extensive damage in the future.
Technologies for treatment of extensions subsidence
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.

Teretek® resin injection for extension subsidence treatment
Teretek® is an engineered solution for re-levelling subsided residential homes and treatment of extension subsidence, using a plural component, expanding polyurethane resin. Teretek® works in a way similar to keyhole surgery. Small holes are drilled under the foundation in order for Mainmark’s proprietary, environmentally inert resin to be injected under the house foundation, improving the stability of the ground and re-levelling the home.

JOG computer-controlled grouting for extension subsidence
JOG computer-controlled grouting is a multi-point injection technique that can be used to remedy extension subsidence in residential homes. This technology typically uses cementitious grout to re-level structures, including residential homes and extensions. This means that cementitious grout is injected under the foundations of your home, using computers to accurately control the injection amounts in the various predetermined locations.
Mainmark’s specialised in-house solutions
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.
Featured Case Studies
A diverse group of passionate professionals, each bringing unique skills and experiences to drive innovation and excellence in every project we undertake.
Benefits of Mainmark’s treatments for extension subsidence
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.
Fast
Our technologies are installed quickly and can be walked on soon after.
Environmentally inert
We use safe materials that are non-toxic and do not leach into the environment or affect the treated area.
Non-invasive
Our solutions are surgical in nature, causing minimal disruption to you and your family.
Cost-effective
Compared to other solutions, our technologies cost significantly less and have fewer associated costs.
Get in Touch
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.

Extension subsidence
At the heart of our journey lies the trust of thousands of businesses worldwide, reflected in the numbers that drive us forward.
Are you concerned about extension subsidence in your home?

Extension subsidence is a problem that should not be ignored. If you suspect your home is experiencing subsidence, it’s important to consult with professionals right away to prevent further damage.
Extension subsidence typically occurs due to problems with the soil under your home’s foundations. As experts in dealing with subsidence in residential homes, Mainmark offers solutions that deal with the root cause of the extension subsidence, getting your home back to normal as soon as possible.
Common causes of extension subsidence include:
Inadequate foundation – If an extension’s foundation is not properly designed or constructed
Shrinkage or erosion of soil – Often caused by flooding or prolonged dry spells, which cause soil to lose moisture
Historic land use – Such as mining or fracking
Mainmark’s extension subsidence solutions, Teretek® resin injection technology, and JOG computer-controlled grouting, are quick, reliable and cost-effective. Work can usually be completed in about a day, causing minimal disruption to your family and allowing you to rest assured that your extension is safe, stable and on solid ground.
The signs of extension subsidence

If left untreated, the problems associated with extension subsidence can become exacerbated, causing more damage, and possibly requiring the extension to be demolished or rebuilt. Knowing the signs of extension subsidence can help you spot problems early and get help before further complications arise.
A common sign of extension subsidence is the noticeable separation between the extension and the main house structure. This will appear as cracks in the internal or external walls where the extension meets the house. As well as being a clear sign of extension subsidence, this separation can be a safety hazard, it can cause draughts and it may allow rainwater and other moisture to get into your walls.
Other potential signs of extension subsidence include:
Cracks in walls, floors or ceilings
Doors and windows that stick or don’t close properly
Sloped, sinking or otherwise uneven floors
Unexplained ripples or creases in wallpaper
Leaning of the extension
By recognising these signs and taking prompt action, you can mitigate the impact of extension subsidence, ensuring the safety of your home and preventing more extensive damage in the future.
Technologies for treatment of extensions subsidence
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.

Teretek® resin injection for extension subsidence treatment
Teretek® is an engineered solution for re-levelling subsided residential homes and treatment of extension subsidence, using a plural component, expanding polyurethane resin. Teretek® works in a way similar to keyhole surgery. Small holes are drilled under the foundation in order for Mainmark’s proprietary, environmentally inert resin to be injected under the house foundation, improving the stability of the ground and re-levelling the home.

JOG computer-controlled grouting for extension subsidence
JOG computer-controlled grouting is a multi-point injection technique that can be used to remedy extension subsidence in residential homes. This technology typically uses cementitious grout to re-level structures, including residential homes and extensions. This means that cementitious grout is injected under the foundations of your home, using computers to accurately control the injection amounts in the various predetermined locations.
Mainmark’s specialised in-house solutions
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.
Featured Case Studies
A diverse group of passionate professionals, each bringing unique skills and experiences to drive innovation and excellence in every project we undertake.
Benefits of Mainmark’s treatments for extension subsidence
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.
Fast
Our technologies are installed quickly and can be walked on soon after.
Environmentally inert
We use safe materials that are non-toxic and do not leach into the environment or affect the treated area.
Non-invasive
Our solutions are surgical in nature, causing minimal disruption to you and your family.
Cost-effective
Compared to other solutions, our technologies cost significantly less and have fewer associated costs.
Get in Touch
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.

Extension subsidence
At the heart of our journey lies the trust of thousands of businesses worldwide, reflected in the numbers that drive us forward.
Are you concerned about extension subsidence in your home?

Extension subsidence is a problem that should not be ignored. If you suspect your home is experiencing subsidence, it’s important to consult with professionals right away to prevent further damage.
Extension subsidence typically occurs due to problems with the soil under your home’s foundations. As experts in dealing with subsidence in residential homes, Mainmark offers solutions that deal with the root cause of the extension subsidence, getting your home back to normal as soon as possible.
Common causes of extension subsidence include:
Inadequate foundation – If an extension’s foundation is not properly designed or constructed
Shrinkage or erosion of soil – Often caused by flooding or prolonged dry spells, which cause soil to lose moisture
Historic land use – Such as mining or fracking
Mainmark’s extension subsidence solutions, Teretek® resin injection technology, and JOG computer-controlled grouting, are quick, reliable and cost-effective. Work can usually be completed in about a day, causing minimal disruption to your family and allowing you to rest assured that your extension is safe, stable and on solid ground.
The signs of extension subsidence

If left untreated, the problems associated with extension subsidence can become exacerbated, causing more damage, and possibly requiring the extension to be demolished or rebuilt. Knowing the signs of extension subsidence can help you spot problems early and get help before further complications arise.
A common sign of extension subsidence is the noticeable separation between the extension and the main house structure. This will appear as cracks in the internal or external walls where the extension meets the house. As well as being a clear sign of extension subsidence, this separation can be a safety hazard, it can cause draughts and it may allow rainwater and other moisture to get into your walls.
Other potential signs of extension subsidence include:
Cracks in walls, floors or ceilings
Doors and windows that stick or don’t close properly
Sloped, sinking or otherwise uneven floors
Unexplained ripples or creases in wallpaper
Leaning of the extension
By recognising these signs and taking prompt action, you can mitigate the impact of extension subsidence, ensuring the safety of your home and preventing more extensive damage in the future.
Technologies for treatment of extensions subsidence
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.

Teretek® resin injection for extension subsidence treatment
Teretek® is an engineered solution for re-levelling subsided residential homes and treatment of extension subsidence, using a plural component, expanding polyurethane resin. Teretek® works in a way similar to keyhole surgery. Small holes are drilled under the foundation in order for Mainmark’s proprietary, environmentally inert resin to be injected under the house foundation, improving the stability of the ground and re-levelling the home.

JOG computer-controlled grouting for extension subsidence
JOG computer-controlled grouting is a multi-point injection technique that can be used to remedy extension subsidence in residential homes. This technology typically uses cementitious grout to re-level structures, including residential homes and extensions. This means that cementitious grout is injected under the foundations of your home, using computers to accurately control the injection amounts in the various predetermined locations.
Mainmark’s specialised in-house solutions
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.
Featured Case Studies
A diverse group of passionate professionals, each bringing unique skills and experiences to drive innovation and excellence in every project we undertake.
Benefits of Mainmark’s treatments for extension subsidence
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.
Fast
Our technologies are installed quickly and can be walked on soon after.
Environmentally inert
We use safe materials that are non-toxic and do not leach into the environment or affect the treated area.
Non-invasive
Our solutions are surgical in nature, causing minimal disruption to you and your family.
Cost-effective
Compared to other solutions, our technologies cost significantly less and have fewer associated costs.
Get in Touch
Our dedicated team of experts is committed to understanding your unique needs and objectives, working closely with you to develop and execute.