10% off for new customers
Highly rated online
IPAF AND CSCS TRAINED - LOCAL FAMILY RUN BUSINESS
Over 15 years of experience
Slash energy bills with expert cavity wall insulation
Quality marked insurance backed guarantee
We won't be beaten on price
Same day quotes
Friendly and reliable
Fully insured & approved installer
Over 15 years of experience
Slash energy bills with expert cavity wall insulation
Quality marked insurance backed guarantee
We won't be beaten on price
Same day quotes
Friendly and reliable
Fully insured & approved installer
Sarah Clarke
After insulating my 1960s home with S.E.F, my energy bills dropped dramatically, and the house feels so much warmer! Highly recommend.
James Milton
Fantastic service from start to finish! The installation team was professional and efficient, and we noticed the difference in comfort immediately.
Cavity wall insulation reduces your energy use by maintaining a constant temperature in your home.
High energy bills and an uncomfortable home shouldn’t be your reality. At S.E.F, we specialise in cavity wall insulation that keeps your home warmer, slashes your energy costs, and reduces your carbon footprint—all while offering tailored solutions that suit your property’s needs.
Get started today with a free quote!
Cavity wall - 10% off spray foam - Hooks
Free Floor Insulation Replacement
Discount on Insulation Upgrades (if we were to remove the spray foam and replace with Super Foil for example, which is an insulation we install).
25% off for new customers.
Why cavity wall insulation?
Save money on energy bills
Stop losing heat through uninsulated walls. Our cavity wall insulation reduces heat loss, significantly lowering your energy bills.
Enhance home comfort
Enjoy a cosy, consistent indoor temperature all year round—no more cold spots in winter or overheating rooms in summer.
A service tailored to your property’s needs
Whether you’re building your dream home or improving an older property, we provide solutions to fit your specific requirements.
Protect the environment
By improving your home’s energy efficiency, you contribute to a greener, more sustainable world.
Guaranteed expertise
With years of experience, S.E.F ensures professional installation and optimal performance that lasts.
Get in touch
Contact a S.E.F specialist today to get a free quote for your bespoke insulation solution.
Our innovative insulation solutions
At S.E.F, we provide tailored solutions that meet the unique needs of homeowners and builders alike.
Polystyrene beads installation
Polystyrene beads offer numerous advantages when it comes to insulation. Their lightweight and spherical design ensure they effectively fill every gap within the cavity, providing comprehensive coverage and minimising heat loss.
This results in significant energy savings by reducing the need for excessive heating or cooling in your home.
Polystyrene beads are also moisture-resistant, preventing dampness and condensation issues that can compromise the structure and comfort of your property. Additionally, these beads are durable and long-lasting, ensuring your insulation remains effective for years to come.
Easy to install and cost-effective, polystyrene beads are a trusted solution for improving energy efficiency in both older and modern properties.
Whatever your property type, our tailored solutions ensure the best results.
Anita Doran
S.E.F did a brilliant job on our new home build. The cavity batts are high-quality, and the results speak for themselves. A+ service.
Aaron Mills
Great team of guys. Helpful from the initial call and the work they did was second to none. Wouldn’t hesitate to use them again
Why Choose S.E.F?
Your property is a long-term investment, which is why meticulous installation matters. At S.E.F, we combine experience, expertise, and the finest materials to ensure every project exceeds expectations.
Trusted experts
We’re specialists in cavity wall insulation with a commitment to excellence.
Tailored approach
No two homes are the same, and our custom solutions reflect that.
Customer satisfaction
We pride ourselves on delivering high-quality service and exceptional results.
Government-backed schemes
We actively participate in the UK government insulation voucher schemes, helping homeowners make their properties more energy-efficient while saving on costs.
Checkatrade approved
Our services are vetted and approved by Checkatrade, reflecting our dedication to quality, reliability, and customer trust.
A warmer home awaits! Reduce your energy bills today!
Stop wasting energy and money. With SEF Ltd, you can transform your home into a more comfortable, energy-efficient space.
Discover how cavity wall insulation can upgrade your home, save you money, and make a positive impact on the environment.
Contact SEF Ltd and start your insulation project today!
Our client feedback...
We were let down by a previous plumber and had our radiator off for 2 months so decided to ask for recommendations at work and someone suggested these guys. We rang them up and they were here the next day to give us a quote and the work was done 2 days later. Really professional and friendly staff, we were so impressed at how quickly the job was done after first contacting them. Would definitely recommend them and it’s good to know we finally have a decent plumber for future problems.
Jasmine L
We've worked with this company for a few years now, and the quality of their work is always top-notch!
Fantastic team of guys highly recommend.
Ian Costello
We had our bathroom fitted July 2024 by this truly professional company. A great set of lads and very polite. I wouldn't hesitate to recommend them.
James David Bramham
The attention of details the lads put in their work was astonishing. The end result was great we’re so happy with our new Bathroom! Especially the newly tiled floor and walls.
Would recommend Opulence to anyone looking to get their bathroom done.
Thank you
James McKenna
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