This research is expected to deliver a validated, deployable AI-based search and data retrieval system that enables natural-language querying over heterogeneous construction documents and returns evidence-grounded answers with explicit citations. The main expected results are: 1. Retrieval performance improvements: Compared to baseline keyword search, the system should demonstrate higher recall and ranking quality on representative construction queries, measured through standard information retrieval metrics (Recall@k, Precision@k, MRR, nDCG@k). Gains are expected particularly for queries where users lack exact terminology or where relevant information is distributed across long, structured documents. 2. Reliable, auditable answering: The proposed RAG pipeline should produce answers that are demonstrably faithful to retrieved evidence, with mandatory citations pointing to exact document locations (e.g., section/clause/table references). Answer quality will be assessed via accuracy, faithfulness, and citation relevance; the system should minimize unsupported claims by enforcing strict grounding. 3. Uncertainty and abstention behavior: The system should reduce harmful or misleading outputs by detecting insufficient evidence and abstaining or requesting clarification. Performance will be quantified through abstention precision/recall and expert review of borderline cases, supporting safer professional usage. 4. Operational readiness under real constraints: The implementation is expected to include confidentiality-aware ingestion, access control mechanisms, and automated incremental updates to support evolving project documentation. Operational results will include acceptable latency for interactive use, efficient indexing and update times, and robust logging for traceability and governance. 5. Industrial validation: Through case studies with corporate partners, the system is expected to demonstrate measurable productivity gains (reduced search time, fewer missed requirements, improved compliance checks) and increased user trust due to transparent citations and consistent behavior. Overall, the project aims to show that construction-specific RAG can outperform traditional search while remaining safer and more trustworthy than unconstrained generative AI.