Building heat loss is simply the amount of heat lost through the fabric of the building. This is the most important calculation that has to be done in order to determine what energy improvements could be made. If your building has a high heat loss some renewable technology may not be advisable.
When looking at fabric heat loss it is also important to consider other types of heat loss; for example from un-insulated pipework. Limitless Energy provides a full energy assessment which determines all heat losses incurred. It looks at how may Watts per Square Meter (w/m2) is lost through the fabric and pulls all other relevant information together to produce an accessible report.