The average energy cost savings from installing rooflights in a typical UK household can vary depending on several factors, including the type of rooflight, the size of the property, and the home’s energy efficiency prior to installation. However, the main areas where rooflights can contribute to energy savings are through the following mechanisms:
Reduced Lighting Costs
Rooflights introduce more natural light into the home, reducing the need for artificial lighting during daylight hours. For a well-positioned rooflight, natural light can significantly reduce the amount of time lights are needed, especially in areas of the home that may be dark otherwise (e.g., hallways, loft spaces, kitchens).
Potential savings: Depending on the type, the number and size of your rooflight/s, this can save around 10-15% of electricity costs related to lighting. For an average UK household, this could translate to savings of £50-£100 annually.
Improved Insulation with High-Efficiency Glazing
Modern rooflights often come with energy-efficient glazing, which helps to reduce heat loss in colder months and minimises heat gain in summer. Double or triple glazing, low-emissivity coatings, and insulated frames help maintain a stable indoor temperature, potentially lowering heating and cooling costs.
Potential savings: By improving thermal insulation, a rooflight can contribute to energy savings of around 5-10% on heating costs in a well-insulated home. In the UK, where average household energy bills (gas and electricity combined) can range between £1,500-£2,000 annually, this could result in a saving of £75-£200 annually.
Improved Ventilation and Passive Cooling
Rooflights that can be opened provide natural ventilation, which helps to cool the home during warmer months. This can reduce the need for energy-intensive cooling systems like fans or air conditioning. Although air conditioning is less common in UK homes, this can still contribute to lower electricity usage for cooling.
Potential savings: While passive cooling might result in modest savings (perhaps £20-£50 annually) for households with limited cooling needs, the comfort and reduction in energy usage could still be noticeable.
Combined Energy Savings Estimate
In total, a household that installs well-designed, energy-efficient rooflights could expect to save £100-£300 annually on energy bills. The actual savings depend heavily on factors like the home’s layout, the efficiency of the rooflight installation, and the existing energy consumption of the household.
It’s also worth noting that while the direct energy cost savings may seem moderate, the overall benefits—improved comfort, increased natural light, and a potential increase in property value—can provide a compelling case for rooflight installation from both a financial and lifestyle perspective.
