Imagine you’re handed a pile of Lego bricks. With them, you can build a car, a spaceship, a house—your imagination is the only limit. Now, imagine you’re handed a pre-assembled, glued-together model castle. It’s impressive, but it’s static. You can’t change it, improve it, or reuse its parts for something new.
For decades, this has been the fundamental challenge in creating smarter buildings. We’ve been installing “model castles”—monolithic, proprietary systems for HVAC, lighting, security, and more. They work, but they’re isolated. They can’t share information or work together to create a truly intelligent, responsive, and efficient building.
What if we could instead build our buildings from a set of universal, interoperable “Lego bricks”?
This isn’t just a whimsical analogy; it’s a necessary architectural shift. In our recent Monday Live session, our community dove deep into the concept of composing Digital Twins for real ROI, and the consensus was clear: to compose the future, we must first master the art of decomposition.
The Lego Analogy: Bricks, Studs, and the Magic of Connection
Let’s break down the analogy, because it’s more than just a cute comparison. It’s a precise framework for understanding interoperability.
- The Brick: This is the core capability or function. It could be a chiller, a VAV box, a lighting controller, or an access reader. Its essence is what it does—the “brick-ness” of the brick. In our world, this is the valuable asset we’ve already paid for.
- The Studs and Anti-Studs: This is the magic. A Lego brick’s true power isn’t in its shape, but in the standardized studs on top and the anti-studs underneath that allow it to connect seamlessly with any other brick in the world, regardless of color or size.
In building technology, the “studs” are the standardized, open interfaces and APIs. They have nothing to do with the brick’s core function, but everything to do with how it connects to the wider world. A chiller shouldn’t just speak “Chiller-ese” (like a proprietary protocol); it needs universal “studs” that allow it to connect to the BMS, the energy analytics platform, and the carbon footprint tracker.
As one community member put it, “The rationale of using the Lego model is that there is only one type of stud that will work with everything.”
The Reality Check: Decomposing Our Existing “Model Castles”
This is a beautiful vision for new construction, but what about the millions of existing buildings? We can’t just tear them down and start from scratch. This is where the “decompose” part of the equation becomes critical.
Decomposing an existing building doesn’t mean physically ripping out systems. It means logically breaking them down into their core capabilities and finding a way to give them those universal “studs.”
This is where a term that often gets a bad rap in our industry becomes a hero: the Gateway.
“There’s almost a disdain for doing something that’s completely normal in other disciplines,” one practitioner noted. “How do you think that 1970s cash register is working inside Walmart? There’s a gateway there. Other industries don’t freak out over this.”
In our Lego analogy, a gateway is an adapter piece. It’s the piece you clip onto an old, non-standard brick that gives it the modern studs to connect to your new creation. It’s a pragmatic, essential tool for bridging the past with the future. Whether we call them “gateways,” “edge devices,” or “connectors,” their function is the same: they are the stud-makers for our legacy systems.
Beyond the Hype: The Tangible Value of a Composable Building
Why go through all this trouble? The payoff is a building that is no longer a static cost center, but a dynamic, value-generating asset.
- Unlocking Silos for Total Building Optimization: When your HVAC can talk to your blinds, which can talk to your weather forecast, you can optimize for energy savings and comfort in ways that are impossible in a siloed environment. This moves us beyond just “making the building work” to making it work optimally at the lowest total cost of ownership (TCO).
- Paving the Way for AI and Natural Language: A composable building is an AI-ready building. As one participant shared, when they asked an AI to visualize their work, it created a complex but interconnected graph. The ultimate goal? “We can just simply walk up and ask, ‘What’s the performance of the chiller?’ and just talk to the system.” This incredible simplicity is only possible with a deeply composable foundation.
- Future-Proofing and Innovation: With a Lego-like architecture, upgrading a single “brick” (like a sensor) is easy. Introducing a new technology (like an EV charging network) is as simple as ensuring it has the right “studs.” This creates an ecosystem where innovation can thrive without requiring a full-scale system replacement.
The Path Forward: Collaboration Over Standardization
The journey to a composable future isn’t just a technical one; it’s a cultural one. For too long, the industry has been bogged down in “religious standards wars,” arguing over which proprietary protocol is best.
The real progress, as evidenced by groups like C4SB and the Linux Foundation, is happening through collaboration. The goal isn’t to create the 15th standard, but to agree on the universal “stud”—the open application-layer interface that allows capabilities to discover and work with each other, regardless of the underlying “plumbing” (like BACnet, Modbus, or MQTT).
As one veteran wisely stated, “In the final analysis, it always ends up being incredibly simple, but it’s terribly complex to make it terribly simple.”
We are in the complex, collaborative work of designing that simplicity. We are decomposing the old to compose the new. We are replacing glued-together castles with a universal set of bricks, empowering building owners to build whatever they can imagine.
The future of smarter buildings isn’t a single, giant AI. It’s a box of Legos.
Want to be part of the conversation? Join us every Monday as we continue to figure out the future for smarter buildings. Watch the full discussion and find past recordings at [MondayLive.org].
