EXPERT ADVICE
What you need to know about eco-friendly insulation
Updated 07/26
By: Alex Peters
Reviewed: Content Team
Thinking about insulating your home but put off by how much energy and how many chemical additives go into some conventional materials? Eco-friendly insulation is a genuine alternative, though "eco-friendly" covers a range of materials with real differences between them, not a single interchangeable choice. It still does the basic job of any insulation: keeping your home warmer in winter and cooler in summer.
What actually makes insulation "eco-friendly"
The genuine benefits over conventional materials
How the main options compare
What to weigh up before choosing one
Roughly what installation costs
Who to hire for the job
Find an insulation specialist near you
What is eco-friendly insulation?
Eco-friendly (or "green") insulation is recyclable, efficient, produced using comparatively little energy, and generally free from the chemical fire retardants and additives found in some conventional insulation. This makes it a cleaner option both to manufacture and to live with.
"Eco-friendly" and "best-performing" aren't always the same thing. Compare actual thermal performance (its U-value or R-value) between materials, not just how green the manufacturing process is, since you still need the insulation to do its job well.
Why choose eco-friendly insulation?
Lower manufacturing energy: some conventional insulation takes up to 10 times more energy to produce than green alternatives.
Lower running costs: better energy efficiency in your home reduces your heating bills.
Fewer harmful chemicals: some conventional insulation contains formaldehyde, a substance linked to increased cancer risk with prolonged exposure. Eco-friendly options generally avoid this.
What types of green insulation are there?
Each material has its own strengths, so the right choice depends on where in the house you're insulating and what matters most to you.
Cellulose (made from recycled paper): affordable, fire-resistant when treated, and highly insulating. Commonly used for loft and wall cavity insulation.
Sheep wool: naturally resistant to mould and fire, highly insulating, and one of the more sustainable options available, though typically pricier than cellulose.
Cork: particularly effective at reducing noise, resistant to damp, and long-lasting. It's a strong choice where soundproofing matters as much as heat retention.
Hemp: breathable and moisture-regulating. It suits older, solid-wall properties that need to "breathe" rather than being fully sealed.
Denim (recycled cotton/denim fibre): good thermal performance and free from itch-inducing fibres. It's easier to handle during installation as a result.
Wood fibre: dense and good at both insulating and reducing summer overheating, often used in roofs and walls.
Which of these actually suits your project depends heavily on the wall type you're insulating. If you have a solid, single-skin wall rather than a cavity, our guide on methods of insulating a single skin wall to meet building regs covers the specific considerations.
Which eco insulation is right for you?
There's no single "best" eco-friendly insulation; the right choice depends on your circumstances:
Prioritise cellulose for a cost-effective, general-purpose option.
Prioritise sheep wool if you want strong all-round performance and don't mind the higher price.
Prioritise cork if noise reduction matters as much as heat retention.
Prioritise hemp or wood fibre for older, breathable wall constructions.
Compare recommendations from a few insulation professionals for your specific property, since factors like wall construction, damp risk, and budget all affect which material makes sense.
On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.
Making the switch to eco-friendly insulation
This is a job worth hiring a professional for, both for a high-quality result and to avoid the risks of DIY. Installing insulation can involve accessing your loft or cavity walls, and mistakes can cause damage or safety issues if done incorrectly. Our guide to finding an insulation installer near you can help you find the right person for the job.
How much does loft insulation cost in 2026?
Loft insulation is one of the most cost-effective ways to improve your home's energy efficiency. Discover what loft insulation costs, what affects the price and how to compare quotes from checked loft insulation installers working in your area.
How much does eco-friendly insulation cost to install?
Cost depends on where the insulation is being fitted, which material you choose, and the size of your home. Our cavity wall insulation cost guide and loft insulation cost guide cover current pricing for the two most common jobs, while our retrofit insulation cost guide is a useful reference for wider whole-home projects.
Before you choose a material
Find an eco-friendly insulation expert
An experienced insulation specialist will help you weigh performance, cost, and sustainability against your home's specific needs, rather than defaulting to whichever material they usually stock.
Find an insulation specialist near you
FAQs
There's no single answer; sheep wool, cellulose, cork, hemp, denim, and wood fibre are all considered eco-friendly, each with different strengths. The right one depends on where you're insulating and what matters most to you.
Many eco-friendly materials perform comparably to conventional insulation, and some (like sheep wool and wood fibre) perform very well. Always compare the specific product's thermal rating rather than assuming "eco" automatically means "less effective," or the reverse.
It varies by material. Cellulose is generally competitive with conventional insulation, while options like sheep wool tend to cost more.
It's possible for straightforward loft insulation. But accessing wall cavities or working at height carries real risk of injury or damage if done incorrectly, so hiring a professional is generally the safer, more reliable choice.
Find an insulation specialist near you
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