An underpinning agreement is a legal contract that outlines the terms and conditions of a process called underpinning. Underpinning is a technique used to reinforce the foundation of a building or structure. It involves excavating and adding additional support to the existing foundation to increase its stability and load-bearing capacity.

An underpinning agreement typically includes provisions related to:

1. The scope of work: The underpinning agreement should outline the specific work that will be done as part of the underpinning process, including any modifications to the existing foundation.
2. Timing: The underpinning agreement should specify the timeline for the work, including the start and completion dates.
3. Costs: The underpinning agreement should outline the costs associated with the underpinning work, including any materials, labor, and equipment.
4. Liability: The underpinning agreement should specify which party is responsible for any damages or injuries that may occur as a result of the underpinning work.

It is important to have a written underpinning agreement in place to ensure that the work is done properly and to protect the interests of all parties involved. If you are considering underpinning work, it is a good idea to consult with an attorney who can help you draft an underpinning agreement that meets your needs and complies with applicable laws.