Open Integration Is Becoming Unavoidable for Smart Building Vendors

The smart buildings market remains highly fragmented, with competing communication protocols, siloed data environments, disconnected vendors, and complex integration requirements. As a result, building owners and operators remain hesitant to scale smart building deployments due to long deployment cycles, high integration costs, operational complexity, and uncertainty around Return on Investment (ROI).

Now, the rise of Artificial Intelligence (AI)-driven automation, sustainability reporting, and real-time operational analytics is reshaping priorities around standardized data exchange and system interoperability. For technology vendors, operating within interoperable ecosystems is becoming non-negotiable for long-term success.

This transition is now being reinforced at the policy level. In early May, the European Commission launched the Horizon Europe Innovation Action (HORIZON-IA) initiative to enhance intelligent data orchestration throughout the building lifecycle. The program focuses on integrating flexible building information systems with whole-life carbon assessment tools to accelerate the digital transformation of the built environment.

A core focus of the program is to drive interoperable data ecosystems that continuously track Whole Life Carbon (WLC), including both operational carbon emissions from building use and embodied carbon associated with construction, renovations, and demolition. Achieving this level of lifecycle visibility requires standardized data-sharing frameworks and unified information models that connect stakeholders across design, construction, and operations, producing a continuously updated “single source of truth” so building owners and operators can easily view and assess building performance and sustainability data.

With a budget of €15.75 million, the initiative strengthens platforms tailored for the revised Energy Performance of Buildings Directive (EPBD), centered on interoperable carbon tracking and sustainability reporting from design through operation. More broadly, the program signals a growing recognition that scalable digital infrastructure and open data exchange are necessary to support climate targets, energy-efficiency mandates, and AI-enabled building operations.

By lowering integration friction and shortening deployment timelines, interoperability expands the number of buildings that can realistically support advanced digital operations. For technology vendors, this shifts competitive advantage away from proprietary lock-in and toward platforms that can integrate across multi-vendor environments using open protocols and standardized data models. As AI-driven building optimization, digital twins, and portfolio-scale automation become more common, building owners and operators increasingly prioritize flexible systems that can normalize and exchange data across Heating, Ventilation, and Air Conditioning (HVAC), lighting, occupancy, energy, security, and Internet of Things (IoT) infrastructure in real time.

Building owners and operators who continue to rely on proprietary systems may face growing integration costs, limiting scalability and making it difficult to adopt AI-driven operational technologies. Continuing to invest in disconnected systems can limit long-term operational efficiency and reduce the value of future technology investments, constraining ROI.

This is driving the use of common standards, cloud-native middleware, and Application Programming Interface (API)-first building operating systems. Vendors enabling interoperable orchestration and data integration reduce deployment complexity while improving scalability, analytics, and lifecycle flexibility. Examples include Johnson Controls OpenBlue, which combines digital twin and AI-driven operational analytics across building systems, and Siemens Building X, an open digital building platform built around API connectivity and cloud applications.

Interoperable environments can reduce the Total Cost of Ownership (TCO) by minimizing custom integrations and reducing future upgrade complexity. The broader market direction is pointing toward software-defined building operations built on open ecosystems that support AI integration, continuous optimization, and cross-portfolio scalability, rather than isolated proprietary stacks.

Vendors that simplify onboarding and support heterogeneous environments will expand the overall addressable market by making smart building deployments faster, less risky, and easier to justify financially.

Open architectures allow owners to modernize incrementally instead of replacing entire building systems at once. Connected ecosystems reduce switching costs, preserve optionality, and create more flexibility for AI adoption, cloud analytics, digital twins, and portfolio-wide automation. While proprietary platforms may maximize short-term revenue, open platforms are increasingly better aligned with how enterprise customers want to deploy and manage infrastructure at scale and maximize total market growth.

For vendors, this means the competitive landscape is shifting from isolated products toward ecosystem enablement, deployment repeatability, and software orchestration. As building owners and operators prioritize progressive integration and flexibility across vendor solutions, they evaluate not only technical capability, but also ease of integration, cybersecurity measures, deployment speed, and long-term serviceability, making it important for vendors to emphasize:

• Design platforms that can ingest and normalize data from legacy Building Management Systems (BMS), third-party sensors, edge devices, and cloud applications without extensive custom engineering.
• Validated reference stacks for key verticals such as hospitals, campuses, retail portfolios, logistics facilities, and commercial office environments where deployment pathways are repeatable.
• Open interoperability standards like BACnet, Message Queuing Telemetry Transport (MQTT), Open Platform Communications Unified Architecture (OPC UA), Haystack, and Brick Schema to simplify cross-system integration.
• Position solutions such as orchestration and data layer platforms that enable AI-driven optimization.

Ultimately, vendors that truly embrace interoperability and make smart building deployments easier to repeat, scale, and govern will be best positioned to lead the next phase of intelligent building infrastructure.