Maximizing Quality, Scheduling and Cost Efficiencies YLH Construction Company (YLH) is a full service construction firm specializing in General Contracting, Design/Build and Construction Management. YLH works with each client on a case by case basis to determine the approach that best fulfills their needs. Regardless of the delivery method, YLH is well positioned in the design and trade communities to maximize a project’s quality, schedule and cost efficiency.