Perplexed by all this talk of u-values and blower door tests? Our sustainable building glossary will help you get to grips with the key terminology.

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Term Definition

Using sunlight for indoor lighting needs


See Dwelling Energy Assement Procedure (Deap)

Dew point

The temperature below which water vapour in the air will start condensing to liquid. This is important in buildings, because anywhere there is a dew point, there is a risk of condensation and mold growth. For example, improperly installing insulation on the inside of a wall can create a dew point between the insulation and the wall.

District heating

A type of heating system in which heat is piped from a large central heating system (such as a boiler) to multiple units (such as houses or apartments), rather than each unit having its own separate heat source. Often financed via energy service companies (ESCos), district heating systems tend not to become less viable in very energy efficient buildings, given that the low space heating demand means smaller bills payable to the ESCos

dry lining
Dwelling Energy Assement Procedure (Deap)

A software programme used to calculate the Building Energy Rating (BERs) of buildings