The difference between reblocking, restumping and underpinning a house

After a few decades, due to environmental damage, wear and tear, most homeowners are planning a home renovation. However, the first step of the home renovation involves ensuring that the floors of the house are levelled. If there is any problem with the foundation of the home, it will be difficult to get the home levelled. So before planning a renovation of a house, the homeowner should get the foundation of the home checked and take corrective measures accordingly. Since restumping, reblocking or underpinning may be recommended after inspecting the foundation, the property owner would like to find out the difference between reblocking, restumping and underpinning a house?

Reblocking and restumping

The terms restumping and reblocking are widely used interchangeably by many contractors who are offering these services. In many of the older houses, the stumps used in the foundation were made from wood. Over a while, these stumps may get damaged due to environmental conditions, termite damage and the weight of the house which they are bearing. In other cases, the foundation may sink due to the surrounding soil, waterlogging and other problems. In all these cases, the floor of the house will become uneven as their position will change.

During restumping or reblocking, the entire home will be supported using a hydraulic jack. New stumps made from concrete will be placed in the foundation of the house, and these will be attached to the floor of the house. In some homes, the blocks are used in the house foundation; hence, the process of replacing the blocks is called reblocking.

It should note that the family living in the home, usually does not have to vacate the house during the process of restumping as restumping Melbourne. The time taken to complete the reblocking varies depending on the size, design of the home and other factors. Typically it can be completed in five to ten days. A clearance of 400 mm below the floor is required so that the hydraulic jack for supporting the house can be installed. If not, the floorboards may have to be removed to gain access to the stumps or blocks in the foundation. After the reblocking is complete, the floorboards will be replaced.

During the reblocking process, there may be some damage to the plastic and paint of the house. Able Reblocking, which offers reblocking services will complete the required paperwork and get the permissions from the local government agencies for the restumping work on behalf of their client. They are using high-quality concrete and steel for the blocks or stumps used so that it is durable and does not get damaged. They offer a warranty of ten years for all the reblocking work which they undertake, though the reblocking will usually last for a more extended period.


In many cases, though the house has been constructed after 1990 and used concrete stumps/blocks in the foundation, these stumps may get damaged or sink due to a variety of reasons. For example, due to soil, heavy rain and weather conditions, the stumps may fall, results in cracks in the brick veneer of the house. It could also result in structural instability of the house. Unlike reblocking, during the process of underpinning, the existing foundation stumps are not replaced; they are only reinforced to make them stronger.

During the process of underpinning, the contractor will dig under the footing and increase the support area for the house by installing concrete pads. These concrete pads are called pins. Depending on the damage of the house foundation, several pins may have to be installed. Like the reblocking process, all permissions and paperwork required will be handled by the contractor, and the time taken, will depend on the size of the house and other factors. Most people are willing to spend a lot of money on home renovation, yet unless the foundation is proper, the money spent on renovation could be wasted. Hence reblocking or underpinning is recommended for older houses.

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