ECCOlab a cloud-based product offers the key instrument to all building professionals (architects, engineers, investors, building operators) and users alike to navigate challenges of satisfying the UK/EU (EU Green Deal) ‘Near Zero Energy Buildings’ (NZEB) and similar regulations in other parts of the world, that usually require minimizing buildings’ carbon/energy footprint at a feasible cost. All of that is delivered in an audited way, using mathematics, physics and economics; this makes ECCOlab, with some localization, deployable anywhere in the world. By using knowledge-based approach through expert systems and Artificial Intelligence (AI) optimization, the entire platform is delivered through a collaborative effort of the industry-leading experts in the respective fields of Energy, Carbon and Cost, as well as Information Technology (IT).