In building maintenance processes there is often the presence of fragmented data, the absence of traceability, and centralized processes in building maintenance mechanisms are the major drawbacks to transparency and efficient operations. In this thesis, the challenges are overcome by presenting and developing a decentralized building maintenance management system, combining Building Information Modeling (BIM) and blockchain technology. The proposed solution is a decentralized application (DApp) for facility maintenance that enables fault reporting, asset registration, and technician coordination through Ethereum-based smart contracts. A 3D BIM model viewer (implemented with the IFC.js library and React) provides an interactive interface for users to visualize building assets and report issues in context, while smart contract logic written in Solidity manages maintenance tasks and enforces role-based access via on-chain rules.