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How Long Does Underpinning House Foundations Take?

Underpinning a house to strengthen its foundations becomes necessary in the event of subsidence – when unstable soil causes the foundations to sink – or if you want to add extra floors.

Either way, underpinning technologies have advanced rapidly in recent years, and several different methods are now available.

Because of the complexities of the job, it’s difficult to predict exactly how long an underpinning project will take, but on average it works out at around four to six weeks.

However, some underpinning or restumping jobs may take longer, especially if unforeseen snags arise – a particular problem in older houses.

For instance:

  • Utility lines may need to be relocated.
  • HVAC (heating, ventilation and air conditioning) systems may have to be modified.
  • Basement stairs could need extending or rebuilding.

The Underpinning Process

Underpinning begins with digging out the ground around the foundations. This is followed by the actual underpinning process. Three techniques popular among Melbourne underpinning contractors are:

  • Concrete underpinning.
  • Placing reinforcing beams.
  • Resin injection.

Concrete Underpinning

Concrete underpinning is often used for smaller jobs. It involves pouring concrete into excavated cavities. As the concrete sets, it forms a new foundation underneath the existing one. It entails the use of formwork moulds and reinforcing steel wires to ensure the concrete is the right shape and size.

Reinforcement Beams for Underpinning

Reinforcing beams – or piles – are driven into the ground or fitted into drilled holes until they’re anchored in stable soil.

Resin Injection Underpinning

With resin injection underpinning, small holes are drilled into the ground around the foundations and filled with environmentally-friendly resin.

Need a Free Underpinning Evaluation?

An experienced Melbourne underpinning contractor will be able to give you a better idea of how long your underpinning job will take – by carrying out a free inspection of your home.

They can also take care of all the preparatory admin work including getting the necessary permits.


Your comment will be published within 24 hours.


  • Braden Bills
    April 23, 2021, 2:43 pm REPLY

    My foundation has been having some issues, and I’m not sure what to do about it. It makes sense that I would want to get a professional to underpin it for me! It’s amazing that doing that can stabilize a foundation so much.

  • Adam Golightly
    May 10, 2021, 10:19 pm REPLY

    My brother has been thinking about getting his foundation looked at because there are a lot of cracks in the concrete. He would really like to get some help from a professional to make sure that it can be underpinned safe. I liked what you said about how they can inset injection, install reinforcing beams, and underpin after digging out the ground.

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