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Home / Underfloor Insulation Grant
Underfloor insulation is the best way to maintain a home warmer.
Most of the time, you’ll only require to insulate the floor. If you’re located on an upper floor, you’ll not require insulate the floor area. But, you must think about insulation of floors over unheated areas, like garages, because you could be losing lots of heat through these.
ECO4 scheme is available for suspended timber floor.
Solid floors are not eligible for the grant.
If you have a cellar under your house or if there are ventilation bricks in your property then it shows that you have a suspended floor which needs to be insulated.
Solid concrete ground floors are common in many homes, especially newer ones, and they can be insulated if damaged or by adding rigid insulation.
In older homes, suspended timber floors are more prevalent, often identifiable by ventilation bricks or vents located outside the home at a level lower than the floor. It’s crucial not to block these vents, as they play a vital role in ventilating the floor and preventing floorboard rot.
For houses with basements or underground areas, examining the floor can reveal whether it’s suspended, showcasing wooden joists and the underside of floorboards. In cases where space permits, inspecting beneath the house might involve removing a corner of the carpet and underlay.
Insulating timber floors involves placing mineral wool between the joists using netting. This process, along with insulating ground floor floorboards, can result in annual savings of around £75 for an average property or £130 for a detached home.
A typical suspended floor installation could cost you around £4,700 depending on the circumstances. Solid floor insulation could cost considerably more.
Here's how much you could save on your energy bill (£/year) as well as how many kilograms of CO2 emissions you could save each year with floor insulation:
Estimates based on a gas-heated home. The average install cost is unsubsidised. Figures are based on fuel prices as of October 2024. Find out more about how we made these calculations.
Concrete floors can be effectively insulated using rigid foam insulation, which can be installed either above or beneath the concrete surface.
When the insulation is placed beneath the concrete floor, it stores heat during the day, contributing to a warmer room at night. Conversely, if the concrete is positioned below the insulation, the inner space heats up rapidly in the morning.
Even if your solid floor doesn’t require replacement, it is possible to insulate it using rigid insulation, with chipboards laid over it. However, this may elevate the floor level, necessitating adjustments such as cutting doors shorter to accommodate the insulation. Relocating skirting boards and some electrical sockets may also be required in the insulation process.
When considering additional floor insulation, it’s imperative to comply with local building regulations, a responsibility typically organized by your installer.
For Wales and England, meeting a minimum U-value of 0.25W/m2K is required for floors, with the U-value indicating the speed at which heat can travel through the floor. This standard necessitates a minimum of 70mm high-performance foam insulation or 150mm mineral wool. However, variations may apply based on factors like floor type, shape, and size.
Strict adherence to these standards is crucial, especially if the intention is to replace at least half of a floor.
