The South East’s Specialist Home Insulation Company
- Cavity wall insulation from £449
- Loft insulation from £599
- Get your free digital quote and survey report
- Join 11,000+ happy homes
- Save on VAT until March 2027
Cavity wall insulation
Loft insulation
Loft cleaning
Loft insulation and boarding
Cavity wall insulation
Removal of spray foam from loft
Cavity wall insulation
Loft insulation
Loft boarding and new loft insulation
Removal of cavity wall insulation
Cavity wall insulation
See How We Compare
Choosing the right insulation provider is an important decision for your home. See how Viridian’s commitment to quality, service, and value sets us apart.
Factors |
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|---|---|---|---|---|
| TrustPilot Score | ||||
| Free property survey carried out | ||||
| No-obligation quote upon survey | ||||
| Fixed-price, money-saving loft and cavity wall packages | ||||
| 25-year cavity wall insulation guarantee | ||||
| 6-year homeowners' loft insulation guarantee | ||||
| IAA Membership | ||||
| Registered for a Competent Person Scheme (CWISC) | ||||
| In-house, professionally trained installers |
Our Industry-Leading Insulation Services
Not sure what you need?
No problem, just get in touch with us and we’ll be happy to help. Contact us on info@viridian.co.uk or by calling 01233 659111 | 01233 659112.
Or you can always:
What To Expect
At Viridian we take pride in delivering professional, stress-free services, with no fuss and no mess.
Send us a request
Use our online form to request a free survey, and we’ll contact you to arrange a suitable date and time.
Book a free survey
We do the survey
One of our qualified surveyors will conduct a short suitability survey (45 minutes to 1 hour). They’ll work out the best insulation solution for your home and provide you with a no-obligation quote.
Find out more
We carry out the work
When you give us the go-ahead, we’ll undertake the insulation work, and any extra services you’ve asked us for. Our professional team will ensure an expert, mess-free installation process.
Are you a local authority, housing association or private landlord?
We regularly work with housing providers and their tenants, and we ensure that your property is EPC-compliant. By prioritising energy efficiency, we help to keep your costs down while ensuring comfort for your property’s occupants
Discover More On Our Blog
Frequently Asked Questions
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How much money can I save on my fuel bill by insulating my cavity walls?
It is estimated that cavity wall insulation installed in a detached house could save you over £420 per year (source: Energy Saving Trust, 2026).
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How much money can I save on my fuel bill by insulating my loft?
It is estimated that 270mm of loft insulation installed in a detached house could save you over £390 per year (source: Energy Saving Trust, 2026).
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How does insulation affect my property’s EPC rating?
Installing insulation in your property is one of the simplest and most effective ways to improve its EPC rating. Boosting it increases the energy efficiency of your home which allows you to save £££ on fuel bills. According to government data, it also adds up to 14% more value to your property, making it attractive in the eyes of prospective tenants or buyers.
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How long does it take to install cavity wall or loft insulation?
It depends on the size, shape and layout of your property (or loft), but we usually complete the insulation within a day, even for larger properties.
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How much does cavity wall insulation cost?
Prices for installing cavity wall insulation typically start from £1,100* for a 3-bedroom property.
*This is only an indicative price. The cost also depends on the size of the property and the complexity of the job.
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How much does loft insulation cost?
Prices for installing loft insulation typically start from £299* for a 3-bedroom property (included in Viridian’s Basic Loft Package).
*This is only an indicative price. The cost also depends on the size of the property and the complexity of the job.
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How do you calculate the price of insulation?
For small areas and our loft package deals, we will quote you a fixed price. For cavity wall insulation of a complete home or property, we calculate prices based on how many square metres need to be insulated, and how complex the installation will be. Your surveyor will be happy to review and explain our pricing if you have questions.
Specialist Home Insulation Services In The South East
We cover Kent, East Sussex, Surrey, South Essex, and South London.