Loft insulation is one of the most effective ways to improve your home’s energy efficiency, reduce heating bills, and lower your carbon footprint. However, understanding the costs involved can be a bit daunting, especially with the variety of materials and installation methods available. In this blog, we’ll break down the costs of loft insulation, what factors influence these costs, and why multifoil insulation is a smart investment for your home.
Why Insulate Your Loft?
An uninsulated home can lose up to 25% of its heat through the roof. Loft insulation acts as a barrier, trapping heat inside during the winter and keeping your home cooler in the summer. Not only does this improve comfort, but it also significantly reduces energy bills. In fact, the savings on heating costs often mean that loft insulation pays for itself within a few years.
Factors Affecting the Cost of Loft Insulation
The cost of insulating your loft depends on several factors, including:
Type of Insulation Material: Different materials come with varying price points. For example, mineral wool is cost-effective, while natural options like sheep’s wool are more expensive. Multifoil insulation, which combines reflective foil layers with insulating barriers, offers excellent performance at a competitive price.
Size of the Loft: Larger lofts require more material and labour, increasing the overall cost.
Accessibility: If your loft is difficult to access or has irregular spaces, the installation may take longer and require specialised techniques, which can add to the cost.
New Installation vs. Top-Up: If your loft already has some insulation but doesn’t meet the recommended 270mm depth, topping it up will generally cost less than a full installation.
Professional Installation vs. DIY: While some insulation types can be installed as a DIY project, others, like multifoil insulation, require professional expertise to ensure optimal performance.
Average Costs of Loft Insulation
Here’s a breakdown of typical costs for different types of loft insulation in the UK:
Blanket Insulation (Mineral Wool): £400 – £850
A cost-effective option for DIY or professional installation.Blanket Insulation (Sheep’s Wool): £1,000 – £2,850
A premium natural material with excellent thermal properties.Loose-Fill Insulation: £550 – £1,050
Ideal for topping up or insulating irregular spaces.Sheet/Board Insulation: £500 – £1,600
A rigid option often used for loft conversions.Blown-Fibre Insulation: £650 – £1,300
Requires professional installation and is great for hard-to-reach areas.Spray Foam Insulation: £1,050 – £3,450
Highly controversial due to potential property devaluation and ventilation issues.Multifoil Insulation: £550 – £1,000
A modern, lightweight solution that reflects radiant heat and maximises loft space.
For a top-up from 120mm to the recommended 270mm, costs are approximately £750 in Great Britain.
Why Choose Multifoil Insulation?
Multifoil insulation is a standout choice for homeowners looking for a high-performance, durable, and space-saving solution. Here’s why:
- Superior Thermal Performance: Multifoil insulation reflects up to 97% of radiant heat, keeping your home warm in winter and cool in summer.
- Space-Saving Design: Its thin, lightweight structure maximises usable loft space, making it ideal for storage or conversions.
- Moisture Resistance: Many multifoil products include an integrated vapour control layer, preventing condensation and mould.
- Durability: With a long lifespan and often a lifetime guarantee, multifoil insulation is a reliable investment.
- Eco-Friendly Options: Some brands use sustainable and recycled materials, aligning with environmentally conscious values.

Why Professional Installation Matters
While some insulation types can be installed as a DIY project, multifoil insulation requires professional expertise to ensure it performs as intended. Proper installation involves creating air gaps, securely stapling the foil, and sealing all seams with foil tape to create an airtight barrier. A poorly installed system can compromise its effectiveness, so it’s always best to trust the professionals.
At LoftFoil, we specialise in the installation of high-quality multifoil insulation, helping homeowners across the UK achieve superior energy efficiency and comfort. Our experienced team ensures every installation is carried out to the highest standards, maximising the performance of your insulation.
Ready to transform your loft and start saving on energy bills? Contact LoftFoil today for a free consultation and quote. Let us help you make your home warmer, greener, and more efficient with our expert multifoil insulation services.