In 1982 the Builders' Association together with the Kansas City Chapter of the AGC, with the approval of the Kansas Insurance Department and the Missouri Division of Workers' Compensation, agreed to sponsor a Group Workers' Compensation Self-Insured Program to be made available to their members, to be known as the Builders' Assoication Self-Insurers' Fund of Missouri and the Builders' Association Self-Insurers' Find of Kansas (The Funds). The formation of the Funds was done to help meet the specialized insurance needs within the commercial construction industry. Due to the high costs of workers' compensation insurance, a number of construction groups, in states other than Kansas and Missouri, were turning to self-insurance as a means to hold down their rising workers' compensation premiums.

The funds were organized as trusts under the laws of Missouri and Kansas and administered so all benefits and excess revenues will flow back to the members as dividends. This concept provides lower costs for members and allows for the program surplus, including investment income, to accrue to the members of the Funds and be returned to the participating members according to a dividend formula subject to regulatory approval prior to the release.

The Funds were the first workers' compensation pools in the United States to receive a rating form the A.M. Best Company, the premier insurance rating organization. On December 9th, 1997, the Funds were assigned an A- (Excellent) rating and have continued to maintain that rating. Over their twenty-five year history the Funds grew to become one of the largest group self-insured workers' compensation pools in the United States. In 2007, due to increasing needs of its members for coverage in states outside of Missouri and Kansas and the competitiveness of the insurance market the Funds began exploring options allowing for growth and evolution of the group self-insurance vehicle.

On July 1st, 2008 Midwest Builders' Casualty Mutual Company, a Kansas domiciled mutual insurance company, was formed with the purpose of assuming all existing policies, all assets, liabilities, and surplus of both existing Funds through an approved Transfer and Assumption agreement. This process was approved by the then members of the Funds allowing for the creation of a single mutual insurance company and for the termination of the existing Funds. Midwest Builders' Casualty has the authority to provide workers' compensation coverage in both Kansas and Missouri and began the process of seeking approvals to write business in additional states. In addition to workers' compensation, Midwest Builders' Casualty, as a mutual insurer, would have the ability to provide other lines of insurance to its policyholders, when and if decided to do so and only after receiving the necessary regulatory approvals.

Membership in the Mutual is restricted to members of the Builders' Association of Missouri, The Kansas City Chapter of the Associated General Contractors of America, the Heavy Constructors Association of Greater Kansas City, the Associated General Contractors of Kansas, the Associated General Contractors of St. Louis, and the Kansas Contractors Association.

Midwest Builders' Casualty is based on the same principles and philosophies that have made the Funds so successful over their twenty-five year history. The unwavering focus on loss prevention and loss control remains unchanged, as it is the main factor that allows for the return of surplus to the participating policyholders in the form of dividend distributions. As a mutual insurance company, Midwest Builders' Casualty will operate in much the same manner as the Funds have done previously with the largest exception being that as a mutual insurer, policyholders are not subject to "joint and several liability" through assessments in the case of fund insolvency. Midwest Builders' Casualty will maintain the same underwriting standards and membership requirements as enforced previously by the Funds. Additionally, A.M. Best Company has assigned Midwest Builders' Casualty Mutual Company an A- (Excellent) rating effective July 1, 2008 based on its financial strength in addition to the successful track record of the Funds.