Home Insulation

Loft Insulation

Loft insulation is one of the most effective and affordable energy-saving improvements you can make to your home. It’s a simple way to keep your property warmer while reducing heating costs.

Current guidance recommends approximately 300mm of insulation, with additional measures such as insulating pipework and tanks. Proper ventilation may also be needed to prevent condensation.

In an uninsulated home, up to a quarter of heat can be lost through the roof. By insulating your loft, attic, or flat roof, you can significantly reduce heat loss and lower your energy bills.

Cavity Wall Insulation

Around a third of the heat in an uninsulated home is lost through the walls. Properly insulating cavity walls is an effective way to save energy and reduce heating costs.

Homes built after the 1920s are likely to have cavity walls, which consist of two walls with a gap between them. If your bricks are laid in a consistent, lengthwise pattern, your home probably has cavity walls.

To insulate, our installers drill small 22mm holes at roughly 1m intervals in the exterior walls. Insulation—typically mineral wool or polystyrene beads—is then blown into the cavity using specialist equipment. Once complete, the holes are filled and finished to blend seamlessly with your brickwork.

For an average home with accessible walls, the entire process usually takes around two hours, providing a quick and effective energy-saving upgrade.

 

Room in Roof Insulation

If your loft is used as a living space, it should be properly insulated to keep it warmer in winter and cooler in summer. Room-in-roof insulation is installed by overboarding with thick insulated plasterboard, which is then plastered and prepared for decorating, providing a comfortable and energy-efficient space.

External Wall Insulation

Insulating solid walls can reduce heating costs and make your home more comfortable. Homes built before the 1920s often have solid walls.

External wall insulation involves attaching a thermal layer to the outside of your walls, which is then finished with a protective render or decorative cladding to shield it from the elements. Once the insulation system is installed, any fixtures or fittings that were temporarily removed are carefully restored.

Internal Wall Insulation

Internal wall insulation is used to upgrade solid wall properties by adding insulation to the interior walls of your home. This creates a thermal barrier between the inside and outside, significantly reducing heat loss. It also improves the acoustic performance of your walls, helping to reduce noise from outside.

Flat Roof Insulation

The most effective way to insulate a flat roof is from the outside. Insulation boards are installed, followed by a new weatherproof layer. This is best done when the roof covering is being replaced and is also required under building regulations for flat roof renewals.

While it is possible to insulate a flat roof from the inside, incorrect installation can lead to condensation issues. Properly installed flat roof insulation can deliver energy savings comparable to loft insulation, helping to reduce your heating bills.

Case Study - Solid Wall Insulation

Cambridge City Council appointed Aran to deliver a comprehensive programme of energy efficiency improvements, including solid wall insulation. The project involved 79 homes and one sheltered housing unit, receiving external wall insulation (EWI), ventilation upgrades, solar PV, and loft insulation, with the most recent installations funded through the Sustainable Housing Development Fund (SHDF). All works were completed on budget and within the agreed timescales.

Resident engagement across the social housing sector also encouraged uptake in the private housing sector, with many households accessing Sustainable Warmth Funding, further enhancing the impact of the programme.

“Aran installed solar PV and a range of insulation measures, including EWI, for Cambridge City Council. They effectively managed material supply and subcontractor capacity throughout the entire programme, delivering consistently high-quality workmanship across all aspects of the project.”