Residential Underpinning: Three Critical Aspects Influencing the Project Costs

The process of underpinning in construction and renovation involves reinforcing the building's foundation. You should consider performing this type of project if your home is old or the building base is not strong enough. This option is significantly cheaper than building an entirely new structure. If you are planning on constructing an extension or your building has been affected by earthquakes or floods, the foundation reinforcement might be critical to the continued use of the building. Unfortunately, the project costs attached to underpinning can be high, particularly if you have just become aware of a problem. Therefore, consider these outlined factors that affect underpinning costs to help you manage your budget more efficiently.

Underpinning Method 

There are different methods for foundation reinforcement, and each requires different levels of work input before completion. Therefore, this will influence the charges from your underpinning contractor. There are two common methods used in general residential underpinning: traditional mass concrete and resin injection. Traditional concrete underpinning is the more costly choice for your home. Typically, this process involves excavating the ground below the house and pouring concrete beneath the current foundational elements. The technique is highly effective for reinforcement, especially if you want to increase the load-bearing capacity. If you want to cut the project costs, choose resin injection. This does not require extensive excavation because the resin material is injected in fluid form. It is highly effective for repairing cracks, crevices and voids.

Location of the Building

The location of your residential building will influence your underpinning expenses. In simple terms, some worksite configurations are difficult to perform renovations in. This will necessitate extra labour and special equipment. For example, if your home is built on a slope, the contractor will charge more because such foundations are not highly accessible. The ground conditions in your property will also determine the ease of excavation. Shifty soil or rocky ground is more difficult to work with. Additionally, you should think about the space surrounding your home and manoeuvrability. If the workers cannot move heavy machinery around the building, more manual work will be required, and this will increase total costs.

Condition of the Foundation

The state of your home's foundation will be factored into the budget. Basically, if there are numerous cracks in the basement and the supporting footings are unstable, the underpinning required will be extensive in comparison to simply sealing voids and fissures. Therefore, you should hire a ground penetrating radar expert to assess the extent of damage before your project for accurate underpinning estimates.