Energy label

Energy label for an existing home

For homes that are already built and lived in, the label is based on an assessment of the property as it actually is.

What is assessed

The assessor records the building envelope and the installations: external walls, roof, ground floor, windows and doors, and the systems for heating, hot water, ventilation, cooling and any renewable energy. Measurements are taken on site rather than assumed from the building year.

Two houses built in the same year and the same street can end up with different labels, because one has been insulated and the other has not. That is the point of an on-site assessment.

What affects the result most

Insulation of roof, walls and floor, and whether it can be evidenced

Type of glazing and the condition of window frames

The heating system and how hot water is produced

Ventilation, and whether heat recovery is present

Solar panels, a solar water heater or a heat pump

The ratio between external surface area and floor area

Why evidence matters

Insulation that cannot be seen and cannot be evidenced may not be counted. Prescribed default assumptions apply instead, and they are deliberately cautious. If cavity wall or floor insulation was added at some point, an invoice or a photograph taken before the work was closed up can change the label class.

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