Building energy audit frequently asked questions
These answers explain what a preliminary Energy-audit.eu assessment can help you organise, and where professional inspection or detailed design is still needed.
What is a building energy assessment?
It is a structured review of entered building-envelope, system and energy-use information used to estimate heat-loss contributions and prepare renovation questions.
Is Energy-audit.eu the same as an official energy audit or energy certificate?
No. Energy-audit.eu is a preliminary digital assessment and renovation-planning tool. It does not issue a statutory audit, energy performance certificate or compliance decision.
Can I use it before renovating?
Yes. It can help document the existing building, identify uncertain inputs and compare questions about insulation, windows, ventilation and heating before detailed design.
Can I use it before buying a house?
Yes. It can help organise documents and questions for property due diligence, but it is not a property inspection, valuation or legal guarantee.
What information should I enter?
Useful inputs include element areas, construction layers where known, windows, doors, heating, ventilation, climate location and available consumption data. Unknown information should be marked as uncertain rather than guessed.
Does the assessment estimate heat loss?
Yes. It estimates component contributions from entered U-values, areas and heating-degree-day climate inputs, plus a ventilation-loss estimate. It does not measure heat loss on site.
Can it compare insulation or renovation options?
It can support renovation-oriented comparisons using entered assumptions. Costs, savings and payback remain approximate and should be checked with project-specific evidence and advice.
Can it evaluate heating-system changes?
Heating-system and consumption inputs provide context, and the theoretical demand estimate can support planning questions. Detailed system sizing, controls and installation design need qualified professional review.
Does it consider condensation or moisture risk?
It provides a simplified condensation-related indicator based on entered layers and assumed temperatures. It is not a hygrothermal calculation or confirmation of moisture safety.
Why can actual energy bills differ from the calculated result?
Bills also reflect weather, occupancy, indoor temperatures, hot water, appliances, energy prices, controls, system condition, air leakage and workmanship. The result is an input-dependent preliminary estimate.
Does better insulation always reduce condensation risk?
Not automatically. Insulation can improve surface temperatures, but moisture behaviour also depends on layer order, vapour control, rain exposure, thermal bridges, airtightness and ventilation.
Why is ventilation important after renovation?
Envelope improvements can change uncontrolled air exchange and indoor humidity conditions. Ventilation should be considered alongside insulation and airtightness to support indoor air quality and moisture management.
Can the result replace professional engineering design?
No. Use the result to prepare questions and a documented brief; use appropriate local professionals for surveys, detailed moisture design, system design, procurement and statutory requirements.
Start a preliminary assessment
Use the report to organise evidence and next questions for your building.
Start your building energy assessmentEnergy-audit.eu provides a preliminary digital building energy assessment and renovation-planning aid. Results depend on the information entered and simplified model assumptions. They do not replace a site survey, detailed moisture design, professional engineering advice, or a certified energy audit where one is required.