Book in your FREE, no-obligation site inspection. Contact us today for peace of mind.

Quick Enquiry Call Us


If you cant find what you’re after please don’t hesitate to contact us.

Select Region

Please select the global region website you'd like to view.


Quick Enquiry

Submit your enquiry using our online form and include a brief message about the type of issues you are experiencing. One of the Mainmark experts will contact you as soon as possible.

This field is for validation purposes and should be left unchanged.


House Underpinning Repair


The Modern Alternative To Underpinning

Traditional underpinning involves digging deep holes next to the footings of your home. This method disturbs your gardens and pavements, often taking weeks to complete. 

Underpinning involves mass concrete pouring to widen a foundation, or installing piles to transfer loads to deeper soils. 

Your house might be built on soft or expansive soils. In this situation, if only part of the footing is underpinned, differential movement can occur between the underpinned areas and the rest of the house. This can result in new damage to the parts of the structure not underpinned.

The Non-Invasive Solution

Mainmark provides an alternative to traditional underpinning. Our non-invasive, engineered solutions can bring your house back to level. Ground improvement enables the foundations to carry greater loads. It also reduces how much settlement or movement happens across your house from season to season. Our Teretek or Permeation Grouting technologies can be used for ground improvement in suitable soils.

If your house has experienced sinking, our re-levelling solutions can improve the ground beneath your house. We can also carry out ground improvement to mitigate further damage. Mainmark use the Teretek and JOG technologies, which are versatile and suitable for re-levelling both simple and complex structures.


Teretek uses a method of injecting polyurethane resin beneath your house. As the resin expands, it gently lifts the structure. This is also a non-invasive and cost-effective solution.

JOG is a multi-point injection system which uses cementitious grout to re-level your entire house all at once.


How we get your home back to level


Mainmark’s Level Correction Methods


Our technologies have fast curing times and treated areas can be used immediately or without the delays compared to traditional repair methods.

Environmentally Inert

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


Our solutions are of surgical nature compared to traditional methods.


Compared to traditional methods, our solutions are more cost-effective.

Get a quote

Arrange a site assessment in 3 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 the Mainmark experts will visit your home or property, assess the damage, and ascertain the likely cause. They will establish the approach needed, creating a plan specific to the needs of your building and provide you with a detailed quote.

This field is for validation purposes and should be left unchanged.

© 2024 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering (NZ) Ltd





About Mainmark

Our team




Media & Press



Privacy Policy

Terms and Conditions

Created by Codex