Who we are

A&O Engineering is a San Diego-based commercial engineering and multi-trade services firm with over 15 years of proven experience supporting complex building systems and commercial properties.

We provide structured engineering solutions across mechanical, electrical, plumbing, structural, and infrastructure systems. Our work supports office buildings, commercial campuses, industrial facilities, and multi-site portfolios throughout the region.

Unlike single-trade contractors, A&O Engineering operates through a coordinated execution model. This means every project is managed with technical oversight, in-house expertise, and clear accountability from start to finish.

Our team understands that commercial infrastructure requires more than quick fixes. It requires consistency, system-level thinking, and dependable execution.

For over a decade, property managers and commercial asset owners across San Diego have trusted A&O Engineering to deliver reliable engineering support that protects operational continuity and long-term asset performance.