A2 Efficiency
Santa Rosa, CABuilding performance consulting, from first principles to policy.
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Building performance consulting, from first principles to policy.
We Make Building Projects a Better Value
Converged Engineering Services
Engineering with Precision
Providing service with teamwork
Planning Solutions for Complex Sites

Consulting engineering, audits and analysis

Designing critical infrastructure that supports life.
Experience. Passion. Excellence.
Energy efficiency engineering and clean energy design for the built environment
Our Work Exemplifies Successful Implementations of Advanced Technologies + Human Design Ingenuities

Safety Focused Engineers

Harmonizing Relationships, Sustainability and Innovation
MEP & Sustainability Consulting

Making Buildings Perform Better

Allison Structural Group is a Columbus, Ohio-based structural engineering and inspection consulting practice serving developers, architects, contractors, realty companies, and facility owners. It provides structural design for new and existing buildings, site civil consulting, condition assessments, and industrial support structures. Project types range from residential additions and tenant improvements to industrial plant upgrades and commercial property acquisitions. The practice delivers projects using BIM and Revit for clear, coordinated design documentation.

Expert commissioning and MEP engineering solutions delivering precise building performance and sustainable design.
Critical investigations, testing, analysis, and design for a more certain world

Trusted Solutions. Proven Expertise. Client Focused.

Smart design, stronger building envelopes

Smart People Creating Smart Buildings

Full Service Structural Engineering
We shape a better world
Solving Engineering Problems at Existing Facilities