Great British Insulation Scheme: 2026 Update Norfolk

Author: Co-Dunkall Ltd || Date: 17th August 2026

Last reviewed: 17 August 2026. Figures and rules can change – always confirm on the official links.

The Great British Insulation Scheme (GBIS) officially ended on 31 March 2026, after three years of helping households across the UK upgrade their insulation. The £1 billion government scheme closed to new applicants in October 2025 and delivered 139,200 measures to 100,900 households nationwide between March 2023 and March 2026.

Key Facts: GBIS Final Figures

Scheme ended: 31 March 2026 (closed to new applicants October 2025)
Total households upgraded: 100,900 across Great Britain
Total measures installed: 139,200
Budget allocation: £1 billion (£388.1 million spent by December 2025)
Top measures: Cavity wall insulation (37%), loft insulation (28%), heating controls (25%)
Low-income households: 53% of all measures delivered to eligible low-income groups

What the Great British Insulation Scheme Achieved

According to the Department for Energy Security and Net Zero’s final report, the scheme installed three main types of improvement: cavity wall insulation accounted for 51,400 measures (37%), loft insulation totalled 39,500 measures (28%), and heating controls made up 34,900 measures (25%).

In England, around 364 upgrades were delivered per 100,000 households. Regional variation was significant: the North East had the highest rate of upgrades at 919 households upgraded per 100,000. Total delivery costs reached £366.0 million, with administrative costs of £22.1 million, bringing the total scheme cost to £388.1 million by December 2025. The average cost of delivering the GBIS obligation was £25.44 per £ of annual bill savings.

Who Was Eligible Under GBIS?

The scheme targeted two eligibility groups. The first group included low-income and vulnerable households, with a ‘Flexible eligibility’ mechanism allowing Local Authorities to refer low-income, fuel-poor or vulnerable households directly. The second group covered properties with an EPC rating of D to G, in Council Tax bands A to D in England (or A to E in Scotland and Wales).

Around 53% of all measures were delivered to the low-income eligibility group, ensuring the scheme prioritised those most in need of support with energy efficiency improvements.

Mid-Scheme Changes in 2025

ECO and GBIS mid-scheme changes came into effect in Spring 2025 for measures installed from mid-November 2024 onwards. The changes meant households became able to receive two primary measures under GBIS in certain circumstances. Between January 2025 and the end of March 2026, around 3,300 households received two primary measures.

In January 2026, the government confirmed GBIS would end as planned on 31 March 2026, with no extension. The government also introduced mid-scheme changes to enable additional ECO4 delivery to be reassigned to GBIS targets, according to Ofgem’s scheme summary.

Quality Concerns and Government Response

In October 2025, the National Audit Office reported failures with the quality of external and internal wall insulation under government schemes. In response, the UK Government offered affected homes free audits conducted by TrustMark, with any identified problems to be fixed at no cost.

This underlines the importance of choosing experienced, professional installers for any preparation and insulation work, whether grant-funded or privately commissioned.

What This Means for Norfolk, Suffolk and East Anglia Homeowners

With GBIS now closed, homeowners and commercial property owners in Norfolk, Suffolk, Cambridgeshire, Essex and Hertfordshire looking to improve thermal performance and reduce energy bills will need to fund insulation upgrades privately or explore alternative grant schemes such as ECO4.

For new-build projects, renovations and commercial developments, proper blown bead and loft roll insulation remains essential to meet Building Regulations and achieve long-term energy savings. Insulation installed beneath screeds—particularly when combined with underfloor heating systems—delivers excellent thermal performance, reduced heat loss, and lower running costs.

At Co-Dunkall, we supply and install a full range of floor insulation materials through Eastern Insulation Supplies, supporting both domestic and commercial clients across East Anglia since 2008. Whether you’re laying a new screed or upgrading an existing floor, we can advise on the right insulation solution for your project.

Frequently Asked Questions

Can I still apply for the Great British Insulation Scheme?

No. The scheme closed to new applicants in October 2025 and officially ended on 31 March 2026. No further applications are being accepted.

What insulation grants are available now in Norfolk and Suffolk?

The ECO4 scheme continues to run and may offer support for eligible low-income and vulnerable households. Check the government’s latest guidance or contact your local authority for details on current schemes.

How much did the Great British Insulation Scheme cost per household?

The average cost of delivering the GBIS obligation was £25.44 per £ of annual bill savings. Total delivery costs reached £366.0 million, with administrative costs of £22.1 million, for a total scheme cost of £388.1 million by December 2025.

Were there issues with insulation quality under GBIS?

Yes. In October 2025, the National Audit Office reported failures with the quality of external and internal wall insulation under government schemes. The government responded by offering affected homes free TrustMark audits, with any problems fixed at no cost.

What should I do if I need insulation for a new screed in East Anglia?

We recommend consulting with an experienced floor screeding and insulation contractor. At Co-Dunkall, we offer full floor preparation, insulation supply and installation, liquid screed, and underfloor heating for domestic and commercial projects across Norfolk, Suffolk, Cambridgeshire, Essex and Hertfordshire.

Get Expert Insulation and Screeding Advice in Norfolk and Suffolk

Whether you’re planning a new-build, renovation, or commercial project, our team at Co-Dunkall can guide you through the right insulation and screeding solution to maximise thermal performance and energy efficiency. Operating across East Anglia since 2008, we’re the region’s largest and most-reviewed floor screeding company, with extensive experience in liquid screed, sand and cement screed, underfloor heating, and floor insulation.

Call us on 01953 488224 or email info@co-dunkall.co.uk to discuss your project and request a no-obligation quote.

Floor insulation, underfloor heating & liquid screed – Norfolk, Suffolk, Cambridgeshire, Essex, Hertfordshire.

Read what our customers had to say

    
 
 
         
   S Pearson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service, professional and reliable each time we use them.
  
 
        
   A Thompson 
 
 
 
 Trustindex verifies that the original source of the review is Google. The team did a professional and courteous job for over 100m2 with insulation. Helpful advice, efficient measures, laying out was done with attention to detail. Pouring was prompt and careful. The skip liner was much appreciated. The levels were perfect for our doors. Helpful advice and ensured we’re satisfied with the results. Thank you and well done. 👍🏻
  
 
        
   M Boby 
 
 
 
 Trustindex verifies that the original source of the review is Google. Co-Dunkall ltd recently laid a floor screed for a new gymnasium floor.Very pleased with the service they provided throughout the process.Hard working team that kept me informed of deliveries to site and left the site spotless .Client super impressed with the floor finish .
  
 
        
   O V 
 
 
 
 Trustindex verifies that the original source of the review is Google. I did screed with them twice, we had our house done in 2 phases and in the 1st phase they supplied us with specific stats, on the 2nd phase they supplied us with different stats model and a control box which allows to connect to them remotely but, then I had an issue with the phase 1 stats won't connect to the system as they don't support that functionality. I rang their customer support and explained the issue, they offered to swap the phase 1 stats with new ones so, all stats will be from the same model and all will connect to the control box.
One more word about their expertise, the 2 phases were done a part so the 1st phase screed was higher than the existing old bit, when they came to do the old bit on the 2nd phase, I asked if they can do the screed so that both bits will be same height, they did it perfectly, both phases met up level and the wood floor on top is at the same height, I must say I was sceptic but, these guys are awesome, they are experts in what they do. that made me so happy!
That is a company who cares about their business and about their customers.
I will definitely recommend and will definitely do business with them again.
Thanks you Co-Dunkell
  
 
        
   P W 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had our screed pumped in and laid by the team at Co-Dunkall today at our self-build, the three man team onsite and those in the office were all professional and friendly at all stages from quotation, survey and the final delivery and instation. Everyone has done what they said they would do and within the timescale given. If you need pumped floor screed I can recomend this company 100%
  
 
        
   H Campbell 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very good service. Nicky and Adrian super helpful to see the job through! 5 star. Screed is silky smooth
  
 
        
   M Brooks 
 
 
 
 Trustindex verifies that the original source of the review is Google. Complete bungalow floor screeded by these guys.
Bob who surveyed the project and supervised the screed being laid is a credit to the company. No more than 1mm difference in levels throughout !
  
 
        
   S smith 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had Co-dunkall provide a cemfloor screed for an outbuilding which needed the floor raising. Thoroughly professional service 3 survey calls and inspections prior to the job. Nikki and the office team all highly knowledgable on so many aspects and on the day they even provided a 6 wheel mini mix to accommodate the property complexities. Good follow up and so pleased for a  very clean and tidy washout considering how messy the job can be. You would not know they had been on site. End result is exactly what we needed
  
 
        
   L Bailey 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent job and Excellent service.
Had 100% confidence in them.
Can't fault them.
They are very professional and they have a lovely approach to customer service.

We have used Co Dunkall on any occasions and will do so in the future.

Would highly recommend.

Thank you very much from the Bailey's.
  
 
  
 
  
 
   Google rating score: 4.8 of 5, based on 53 reviews

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