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ECO4 Flex scheme

Under the new ECO4 Flex scheme, the funding will cover the whole house retrofit approach, so multiple measures can be installed within the property.

What is ECO4 Flex?

ECO4 Flex is a flexible approach to identifying eligible households and to target low-income households who are unlikely to be in receipt of the ECO4 qualifying criteria.


Applying for ECO4 Flex

Properties must be an EPC rating of D or below in order to qualify for the ECO4 Flex funding, to check your EPC on the GOV.UK energy certificate webpage.

If a property does not have an EPC, the ECO4 Flex installer may carry out a survey to determine the EPC rating of the property.

To be assessed for ECO4 Flex applications must be made via an ECO4 installer registered with Stockton-on-Tees Borough Council, you must complete and sign a short application form that is then submitted to the council along with supporting documents, such as proof of income, for determining eligibility.

The ECO Flex eligibility criteria is detailed on our  ECO4 and Great British Insulation Scheme Statement of Intent V.2 (PDF) [120KB] . Previous versions of the statement of Intent can be accessed, please contact

Residents cannot send the application form directly to us, as we will only accept applications from the household's chosen installer, which has been approved by the council.

Once we've confirmed eligibility with proof of occupancy or ownership (via bank statements, wage slips and other accepted evidence), we'll provide a declaration to the installer and to Ofgem.

Once the sign off has been completed, the final decision will lie with Ofgem and the grant funders whether to accept the ECO4 LA Flex application.


How to find a registered installer?

In order to help safeguard residents we have carried out extensive checks and a vetting process to ensure the installer companies listed below are fully compliant to deliver works under the ECO4 Flex scheme within Stockton-on-Tees. We will only accept applications from the installer companies listed below for the ECO4 flex scheme.

Each company listed below will be able to provide you with further information on the range of energy efficiency improvements they specialise in. Most companies have a website where you can find out more about them and how to contact them directly.

Please note, the installer companies listed below are not contracted by us and neither do they work on our behalf.

Registered installer

Contact details


Contact number: 01962 679048


Elite Group

Contact number: 01325 466016


Marshall and McCourt

Contact number: 01642 913200


Rothwell Plumbing Services

Contact number: 0845 058 0170


Heat4Energy Ltd

Contact number: 0800 998 7776


Insulation and Heating Installations Ltd

Contact number: 0800 048 590


Hamilton (Building Contractors) Ltd

Contact number: 08000 291966


Once you have chosen your installer, we recommend you request to see their company ID when they visit your property. Make sure they leave you with their contact details in case you want to check on the status of your application after they leave because we will not have access to this information.


ECO4 Flex improvement measures you could qualify for

Your chosen installer will carry out a survey and identify a package of improvements suitable for your property and will make the necessary arrangements for the installation of the energy efficiency measures. 


If you are not happy with the installation

Any complaints or issues regarding the ECO4 Flex scheme in the first instance should be referred back to the ECO4 Flex installer company which has carried out the works at the property. The ECO4 Flex installer company will have a standard complaints procedure which they must follow to address any complaints.

If you feel that your complaint has not been dealt with sufficiently by your chosen ECO4 Flex installer, you can then contact us through our complaints process.. However, we will only be able to provide further advice on how to escalate the complaint further.

You can also contact Citizens Advice Consumer Services for free impartial advice.


Have any further questions about ECO4 Flex?

Visit the Ofgem ECO webpage for more information.


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