Elevating the building energy modeling industry

Big Ladder is a software and services company that provides innovative software tools, top-quality services and resources for software training and support, and industry-leading consulting services in energy modeling analysis and research.

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Your Partner in EnergyPlus™

We specialize in all things related to the EnergyPlus™ simulation engine.

We provide software tools, training, support, and consulting services for EnergyPlus to mechanical, architectural, and design engineering firms across the US.

As members of the EnergyPlus™ Development Team, we have over 15 years of collective experience programming EnergyPlus. We have been involved with developing component algorithms, user interfaces, and other tools for EnergyPlus. As developers we are able to delve into the program source code to help debug users’ problems.

Building software tools that we would want to use ourselves

Smarter Software for Building Energy Modeling

We design and maintain open-source tools that make modeling faster and more accurate. Backed by years of EnergyPlus expertise, we deliver solutions trusted by clients and inspiring to future engineers alike.

Helping Clients Reach New Heights

We specialize in all things related to the EnergyPlus simulation engine. We provide software tools, training, support, and consulting services for EnergyPlus to mechanical, architectural, and design engineering firms across the US.

Trusted by leading organizations shaping the future of building energy modeling.