This report briefly presents information about the current state and analyses all feasible measures leading to the increased energy efficiency of ten multi-apartment buildings in the five ComAct pilot countries, that are Hungary, Lithuania, Republic of North Macedonia, Bulgaria and Ukraine.

The buildings are different by age, size, climate and type. For all of them, the renovation measures are divided in two large groups, that are reduction of energy consumption and introduction of renewables. For each building instead, the report outlines:

• Basic information about building: location, number of apartments and residents.
• Description of current state and condition of building’s envelope, heating and DHW systems.
• Information about billing system for heating, DHW and electricity.
• Description of proposed energy efficiency measures with estimated quantities of materials and work required for implementation, and possible savings in energy and money.
• Overview of measures and energy and financial savings, with aim to enable creation of scenarios

The first part of this document containsa description of the methodology and approach to savings calculation for every proposed measure. It provides details regarding constraints, estimations and possible simplifications in calculations.
The second part contains the above-mentioned information for the ten buildings in five pilot countries, as well as overview tables with savings, required for the development of scenarios.

This document is neither preliminary nor detailed energy audit. It will be used by community staff, energy managers in utility companies, and it should be easily understandable for non-engineering people. Therefore, it does not contain detailed technical descriptions of systems, but brief information about measures, estimated savings in energy and money (if possible). For each building, an overview table is given, containing all available data about all proposed measures, so that anyone (including residents) can have an insight of the proposed measures and savings.