How much does restumping a house cost?

Finance Journalist · 16 October 2019

If your floors are sloping in one direction or you’ve started to see cracks in your walls, it could be a sign that your house needs restumping. So you’re not stumped by what the cost could be, we lay out what this process involves and some factors that can impact its overall price.

What is restumping a house?

Restumping, also known as reblocking, is when the existing stumps under a house are replaced with new ones. A house may undergo a full restumping (where all stumps are replaced) or a partial restumping (if some of the stumps are still in good condition). Restumping will commonly involve replacing deteriorated timber stumps, for example those that have rotted or suffered termite damage, with concrete, galvanised steel or rot-resistant timber stumps. 

Restumping can be an important process, because stumps support the structure of the house they sit under. So, if left untreated, defective stumps can lead to structural damage and potentially result in the house totally or partially collapsing. 


What does restumping a house involve? 

Generally, the process will begin with a professional assessing which stumps need to be replaced. According to Black and White House Raising and Restumping, this often involves visually inspecting the stumps for decay, as well using a level to see how even the floor is.

Before starting work, the soil underneath your house should typically also be checked. Global Reblocking says an engineer should assess how deep the stumps should be, depending on the soil condition. This may help to avoid problems in the future. 

The next step is jacking up the house and removing the defective stumps. The remaining stump holes may then be reused, or further digging may be required if they aren’t deep enough. 

Next, the new stumps will be positioned, ensuring the house will sit level. Once these have all been installed, the house will then be lowered onto the new stumps and secured. 

How much does restumping a house cost?

According to tradie listings website HIREtrades, fully restumping a 150 square metre home will set homeowners back at least $10,000 to $23,500. Building inspection company Action Property Inspections estimates the cost of restumping a typical Queenslander home to be between $10,000 to $30,000, depending on the number of stumps that need replacing. 

Some factors that may impact the end cost of a restumping job include:

  • Number of stumps being replaced – Global Reblocking says that in Melbourne, for instance, the average price per stump is between $500 and $700. 
  • Stump material – galvanised steel stumps are generally the most expensive option, according to Dion Seminara Architecture. However, these are low maintenance and will typically last for a long time. On the other hand, timber stumps are the cheapest option (cheaper than concrete stumps) but they may not last as long. 
  • Space underneath your house – the lower your house is to the ground, the more difficult it could be for builders to access the stumps underneath it. According to house stump supplier LevelMaster, in some cases workers may need to excavate or lift the floor boards in order to restump the house, which can add to the costs involved. 
  • Soil condition – poor soil conditions can also make the restumping process more expensive.
  • Existing foundations if the existing foundations can be reused, this may cut down on time and costs.
  • Existing stump holes – similarly, if the existing stump holes are reusable, this can also save time and money, as it could mean less digging work is required. 

What are the options to finance restumping a house?

Before you dive into the work, thinking about the most suitable way to pay for your renovation is an essential step.

Depending on your situation, your options could include:

How do I know if my house needs restumping?

In addition to visibly rotted or otherwise deteriorated stumps, some common signs that your house may need restumping are:

  • Doors and windows sticking or not opening and closing properly 
  • The floor sloping in one direction 
  • Sagging or uneven floors
  • Cracking interior and exterior walls 
  • Floors that feel spongy or bouncy underfoot 

How long does it take to restump a house?

How long restumping takes will depend on a number of factors, including whether you are completely or partially restumping your home. According to Queensland House Restumping, a full home restumping project takes on average seven to nine days, depending on the size of the house. If only a few stumps are being replaced, Queensland House Restumping says it will take approximately one to three days. 

Renovating a home could change what insurance cover you may need. Compare home and contents insurance providers.

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Main image source: Blue Jacaranda (Shutterstock)


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