Cosman Construction

Cosman Construction is a construction company in Boulder, Colorado. This boutique design-build firm specializes in residential projects including home additions, interior and exterior remodeling, custom deck building, outdoor living spaces, and design refresh services. Serving homeowners, property owners, and property management companies, the company provides services throughout Boulder County and the surrounding Front Range.

Led by Alex Cosman, the firm operates with a focus on accountability and direct communication. Every project begins with a personal consultation to assess goals and produce design drawings, a written scope, and an estimate. The company manages the entire process under one contract, from the initial design conversation through the final permit and walkthrough. Notably, clients have the flexibility to use the produced designs with other builders, and if they choose to proceed with Cosman Construction, the design fee is credited toward the total project cost. Since founding the company in 2013, the firm has maintained a standard where the person responsible for the project remains the primary point of contact from start to finish.

The business is located on Arapahoe Ave, situated near the University of Colorado Boulder (CINC), the Boulder Police Department, and various government offices including the Department of Motor Vehicles and the RTD Office.

Cosman Construction is recognized for its commitment to craftsmanship and its reliable, transparent process. The firm is known for providing a single point of accountability, ensuring that every detail of a build meets high standards before the final walkthrough is completed.

For homeowners seeking dependable residential construction, Cosman Construction provides expert design-build services across Boulder.