Insulation
Insulation is the most effective way to reduce your home’s energy usage and carbon footprint. By creating a thermal barrier around your property, you keep heat inside during the winter and out during the summer.
In the UK, around one-third of all heat lost in an uninsulated home escapes through the walls, and a further quarter through the roof.
The “Fabric First” approach
Before considering expensive technology like heat pumps or solar panels, you should ensure your home is well-insulated. This “fabric first” approach reduces the amount of energy your home needs to stay warm, allowing you to install smaller, cheaper heating systems and enjoy lower bills immediately.
Key areas to insulate
Depending on your property type and budget, you should prioritize these areas:
- Loft and Roof: The easiest and cheapest area to insulate, with the fastest payback.
- Walls: Whether you have cavity or solid walls, this is where you can save the most energy.
- Floors: Often overlooked, but essential for removing cold spots and draughts at ground level.
- Windows and Doors: Upgrading glazing and sealing gaps to prevent heat loss.
Grants available: You may be eligible for free or subsidised insulation through the Great British Insulation Scheme or ECO4.
Tools
- U-value calculator — Check how effective your current or planned insulation is.
Guides
- Loft insulation — Topping up to the recommended 270mm.
- Cavity wall insulation — Filling the gap in modern brickwork.
- Solid wall insulation — Solutions for pre-1930s homes (Internal and External).
- Floor insulation — Dealing with suspended and solid floors.
- Condensation and mould — Managing ventilation after insulating.
- Draught proofing — Simple, low-cost ways to stop heat escaping.
- Double and triple glazing — Upgrading your windows for better thermal performance.
- Insulation materials guide — Comparing mineral wool, PIR board, and natural fibres.
- Find an installer — How to find accredited professionals.