Guest Editor(s)
Prof. Debora Anelli
Email: debora.anelli@uniroma1.it
Affiliation: Department of Architecture and Design, Sapienza University of Rome, Rome, Italy
Homepage:
Research Interests: economic evaluation of energy and urban projects, techno-economic analysis, building energy renovation, sustainable finance and ESG, multi-criteria decision analysis, urban regeneration, real estate valuation, green value recapture, decision-support and optimization models

Dr. Francesco Sica
Email: francesco.sica@uniroma1.it
Affiliation: Department of Architecture and Design, Sapienza University of Rome, Rome, Italy
Homepage:
Research Interests: economic evaluation of projects, environmental economics, assessment of ecosystem services and nature-based investments, multi-criteria decision analysis and mathematical programming, decision-support systems for sustainable urban and energy-related projects, evaluation of urban regeneration strategies, energy-transition policies, and decarbonization pathways in the built environment, integrated assessment models for environmental, economic, and social impacts

Prof. Pierluigi Morano
Email: pierluigi.morano@poliba.it
Affiliation: Department of Civil, Environmental, Land, Building and Chemical Engineering, Polytechnic University of Bari, Bari, Italy
Homepage:
Research Interests: real estate valuation, economic evaluation of investment projects, financial feasibility and risk analysis of energy-efficient building renovation, techno-economic assessment of sustainable urban transformation, public–private partnership and project financing for low-carbon interventions, property-value effects of energy performance improvements, decision-support models for urban regeneration, environmental economics, and energy transition policies

Prof. Francesco Tajani
Email: francesco.tajani@uniroma1.it
Affiliation: Department of Architecture and Design, Sapienza University of Rome, Rome, Italy
Homepage:
Research Interests: appraisal and valuation, real estate market analysis, economic and financial evaluation of urban regeneration projects, ESG-oriented real estate valuation, assessment of energy retrofit programs and building decarbonization strategies, property-value impacts of energy-performance improvements, decision-support models, multi-criteria analysis, and risk assessment for sustainable investments, public policies, and energy transition in the built environment

Summary
The decarbonization of the existing building stock requires the coordinated development of energy-efficient technologies, engineering assessment methods, optimization models, and economically viable implementation strategies. Deep energy renovation can substantially reduce energy consumption, greenhouse gas emissions, and peak energy demand while supporting the integration of renewable energy sources. Its large-scale deployment remains affected by technical uncertainty, high initial investment costs, fragmented ownership, energy-price volatility, and heterogeneous building characteristics.
This Special Issue aims to collect original research on the engineering, techno-economic assessment, planning, and optimization of energy renovation strategies for buildings, districts, and urban energy systems. Particular attention will be devoted to studies integrating energy-performance modelling with investment analysis, uncertainty assessment, decision-support systems, and innovative financing mechanisms.
Suggested themes include, but are not limited to:
· Building and district energy modelling and performance simulation;
· Deep energy renovation technologies and retrofit strategies;
· Integration of renewable energy systems, heat pumps, and energy storage;
· Multi-objective optimization of energy efficiency interventions;
· Life-cycle cost and techno-economic assessment of energy projects;
· Energy-performance gaps, uncertainty, sensitivity, and risk analysis;
· Artificial intelligence, digital twins, and smart energy management;
· Energy communities and distributed urban energy systems;
· Energy performance contracting and innovative financing for renovation;
· Property-value effects and Green Value Recapture related to energy improvements;
· Energy poverty and equitable access to energy renovation;
· Policies and implementation tools supporting the Energy Performance of Buildings Directive.
The Special Issue welcomes theoretical, methodological, computational, experimental, and case-study contributions that advance the engineering and economic implementation of the energy transition in the built environment.
Keywords
deep energy renovation, techno-economic analysis, building energy performance, multi-objective optimization, innovative energy finance, green value recapture, decision-support systems, energy performance of buildings directive, sustainable built environment, energy transition