DONLON BUILDERS

a Southern California–based industrial contractor and developer specializing in Industrial construction and Industrial Outdoor Storage (IOS) facilities. For over four decades, we have partnered with owners, developers, and investors to deliver high-performance industrial projects that support long-term operational success.

As a family-owned company, we bring a hands-on, relationship-driven approach to every project. Our team works closely with clients from early planning and entitlement through construction and final delivery, ensuring each facility is functional, durable, and aligned with business objectives.

Our portfolio includes tilt-up warehouses, industrial site development, IOS yards, and specialized facilities across the greater Southern California industrial markets. Whether acting as general contractor, design-build partner, or development collaborator, Donlon Builders is committed to reliability, craftsmanship, and results that stand the test of time.

Donlon Builders was founded in 1980 by Joseph Donnellan and is now led by his son, Desmond Donnellan, the company remains family-owned and relationship-driven. This continuity of leadership reflects our long-standing commitment to reliability, accountability, and enduring client partnerships across generations of projects.

Desmond Donnellan, President, oversees all operations and is responsible for building long term relationships and partnerships with clients, consultants and subcontractors.  He has extensive construction management experience, combined with strong relationships in the Southern California real estate market.