LCCbyg, developed by the Danish Building Research Institute at Aalborg University together with specialist software designers, is a decision-support tool that calculates lifecycle costs for whole buildings or individual components. By assessing construction, operation, and maintenance costs over time, this approach enables users to compare alternatives with different cost profiles and identify the most economically robust long‑term solution. The tool simplifies complex calculations through built‑in default values while still allowing users to tailor parameters to project‑specific needs.

For public and private clients, consultants, contractors, and manufacturers, LCCbyg provides a structured basis for evaluating design choices, documenting statutory lifecycle assessments, and demonstrating the operational savings associated with particular systems or products. Used within a broader lifecycle costing strategy, it supports more coherent decision‑making, clearer business cases and better value in both new construction and renovation projects.