KLB Construction is a Mukilteo-based construction company founded in 1984 by Kelly Bosa. Kelly was later joined by her brothers, sister, and husband, as well as many other key employees. While KLB was once small, it has grown into a multi-million dollar company that has expanded beyond the Northwest Region of Seattle.

Today, KLB works primarily in Washington.
It operates over 500 pieces of equipment, which allows KLB to maintain its position in the Heavy Highway market, the backbone of the Company's work since it was founded.

KLB's greatest asset is its employees. Because of KLB's employees, and their commitment to excellence, KLB has a reputation of always timely performing the highest quality of work. KLB strives for a team relationship with its clients to partner with them to achieve a high-quality finished product.