A common misconception about dormer loft conversions is that they will increase your heating bills. In reality, a house extension in Hayes which adds insulation in your loft and uses energy-efficient windows can improve your home’s energy efficiency. Having energy-efficient loft space can even increase your property value. A home extension in Hayes which increases the energy efficiency of your home can be a great selling point for potential buyers who are looking for a home that is environmentally friendly and will save them money on their energy bills.