Many households will be paying 10–15% more than they should on their heating bill because of draughts, and when a lack of insulation is also an issue, that figure goes up. However, many draughts are easily fixed, and for a little outlay a considerable sum can be saved. Insulation can often be installed by the homeowner and lead to a substantial reduction in heating bills. This comprehensive guide covers all aspects of draughtproofing and insulation, with principles and techniques that can be applied in all homes.