Foundation Underpinning Contractor Northern Virginia is Fairfax Contractor. There are many reasons you may need to underpin your home’s foundation. Most of the underpinning projects Fairfax Contractor performs are areas in Northern Virginia with problem soil conditions. Concrete underpinning your home involves going under your existing foundation and digging pits with soil that will support your foundation. Underpinning your foundation should be designed by a Virginia-licensed engineer. Fairfax Contractor has the credentials as a Virginia class A (RBC) contractor to pull the necessary permits to complete an underpinning project. Though we will pull a permit to underpin your home, most Northern Virginia Counties will require 3rd party inspections by an approved engineer. For more information on repairing a basement foundation in Northern Virginia, Check this link.