The WMCA is composed of construction contractor organizations, contractors, organized labor and affiliate members. The WMCA is committed to a program of quality craftsmanship and professional contracting. The Alliance was formed in 2003. The primary purpose of the WMCA is to promote and market the advantages of the organized construction industry in West and Southwest Michigan in order to provide the highest quality, most cost effective and safest delivery of our products and services to our customers/owners.