Customer Contributions for ECO4: What to Know
“If ECO4 is helping to fund the work, why am I being asked to contribute?” It is a fair question. Qualifying for ECO4 does not always mean every measure will be fully funded, as support can vary by property, project cost, supplier and available funding.
ECO4 has been extended until 31 December 2026, but the extension did not increase the existing obligation targets. This may mean providers need to be more selective about the projects they support. A customer contribution does not automatically make an offer unfair, but it should always be clearly explained.
This guide covers why contributions arise, how they may be calculated and what to check before agreeing to pay.
A customer contribution is the amount you agree to pay when the ECO4 funding available does not cover the full cost of the proposed improvements.
It is not required for every installation, and it is not a fixed fee set by Ofgem. ECO4 funding can vary by property, supplier, delivery partner and the measures being installed, so different providers may offer different packages.
Your contribution, payment schedule and any conditions should always be clearly confirmed in writing before you agree to proceed.
Is a Customer Contribution the Same as a Deposit?
Not always. A customer contribution is your agreed share of the ECO4 project cost. A deposit is usually an advance payment made towards that agreed amount.
| Customer contribution | Deposit |
|---|---|
| Your agreed share of the total project cost | An advance payment made before the work begins |
| May be paid upfront, in stages or through an agreed finance arrangement | Usually deducted from the remaining amount owed |
| Should be clearly confirmed in the quotation or contract | May be refundable or non-refundable, depending on the agreed terms |
Why Are Contributions More Relevant During the ECO4 Extension?
ECO4 was originally due to end on 31 March 2026 but has been extended to 31 December 2026. However, the existing obligation targets were not increased.
This means the extension is mainly intended to help suppliers complete outstanding installations, remedial work and compliance requirements—not create a larger funding pot for unlimited new projects. As a result, funding may be more restricted or selective, and some households may be asked to contribute towards the cost.
| Detail | Information |
|---|---|
| Original end date | 31 March 2026 |
| New end date | 31 December 2026 |
| Were targets increased? | No |
| Main purpose | Complete existing obligations and remedial work |
| What it means for households | Funding may vary, and a new enquiry does not guarantee a fully funded offer |
Does Being Eligible for ECO4 Guarantee Full Funding?
No. ECO4 eligibility means your household and property may qualify for support, but it does not guarantee a fully funded installation.
The project must still pass several stages, including the property survey, technical assessment, measure suitability and supplier funding approval. Suppliers decide which projects they support and how much funding they provide.
Before proceeding, make sure the proposed measures, customer contribution, payment terms and final approval are clearly confirmed in writing.
Why Might a Household Be Asked to Contribute?
A customer contribution is usually requested when the ECO4 funding offered does not cover the full cost of the properly assessed project. The exact reason should always be explained clearly and in writing.
| Reason | What it may mean |
|---|---|
| Funding does not cover the full project | The contribution may cover the difference between the available ECO4 support and the complete installation cost. |
| The property needs more extensive work | The project may require several insulation measures, heating upgrades, ventilation, additional controls or larger equipment. |
| Some work falls outside the funded scope | Optional upgrades, repairs or additional work may need to be paid for separately. |
| Providers use different funding arrangements | Suppliers and delivery partners may offer different packages, equipment, guarantees, exclusions and contribution amounts. |
| The survey identifies extra requirements | Access problems, electrical work, ventilation needs, defects or design changes may affect the final cost. |
A quotation should clearly separate ECO4-supported measures from customer-funded additions and any work outside the funding offer. Customers should avoid accepting one unexplained total.
Where possible, compare quotations on a like-for-like basis, including the measures, equipment, guarantees, exclusions and installation timescale. Any change after the technical survey should be explained and agreed before work proceeds.
How Is an ECO4 Customer Contribution Calculated?
There is no standard ECO4 contribution set by Ofgem. The amount usually reflects the difference between the total project cost and the funding offered through the relevant supplier route.
The quotation should clearly separate funded measures, customer-funded work, optional additions, VAT where applicable and any deposit already paid. It should also explain whether the final amount could change after the technical assessment.
| Item | Illustrative amount |
|---|---|
| Complete proposed project | £14,500 |
| ECO4 funding offered | £11,500 |
| Customer contribution | £3,000 |
The table provides a general guide. The actual work should be confirmed in your property-specific design and contract.
What Should an ECO4 Contribution Quotation Include?
A clear quotation should show exactly what is being funded, what you are paying for and who is responsible for the work.
ECO4 Contribution Quotation Checklist
- Complete scope of work
- Measures included and excluded
- Equipment specification, where relevant
- Total project cost
- ECO4 funding applied
- Customer contribution
- Deposit and payment schedule
- VAT position
- Possible price variations
- Installation and making-good responsibilities
- Guarantees and aftercare
- Cancellation and refund terms
- Name of the company you are contracting with
What Should Be Explained Separately?
The quotation should clearly separate:
- ECO4-funded measures
- Your contribution towards the main package
- Optional upgrades
- Repairs or enabling work
- Finance charges, where applicable
Avoid accepting a quotation that shows only one total without explaining how the amount has been calculated.
Can Paying a Contribution Still Represent Good Value?
Sometimes. A contribution may offer good value when it helps fund a properly designed package of improvements worth significantly more than the amount you pay.
Consider the full scope of work, the property’s needs, installation quality, guarantees and the cost of arranging the same improvements privately. Do not rely on promised savings or EPC improvements before the property has been fully assessed.
| Worth considering | Pause and check |
|---|---|
| Several important property issues are addressed | The contribution cannot be clearly explained |
| A substantial part of the project is funded | You are pressured to decide quickly |
| You receive a complete written quotation | No detailed scope or quotation is provided |
| The payment is affordable | Approval or savings are guaranteed |
| Private installation would cost considerably more | Payment is requested before key checks |
| Equipment, design and guarantees are clearly explained | Refund terms or company responsibilities are unclear |
| You have compared similar offers | You are discouraged from comparing providers |
What Happens After You Accept an ECO4 Contribution?
Accepting a contribution does not always mean the installation is immediately approved. The project may still need to complete several checks.
Initial check → Survey → Design → Approval → Contract → Installation → Handover
1. Eligibility and Evidence Checks
Your household and property information may be verified.
2. Property and Retrofit Assessment
The assessor reviews the home, existing heating system, condition and suitable improvements.
3. Technical Design and Final Scope
The proposed measures are confirmed or adjusted following the survey.
4. Funding and Supplier Approval
The supplier may need to approve the final project before installation is booked.
5. Contract and Payment Arrangements
You should receive the confirmed scope, contribution amount, payment schedule and terms in writing.
6. Installation and Quality Checks
The approved measures are installed and checked in line with the project requirements.
7. Handover and Aftercare
You should receive installation records, guarantees, commissioning details, user instructions and clear complaint or aftercare contacts.
Frequently asked questions (FAQs)
Clear answers about ECO4 customer contributions, deposits, approval, quotations, survey changes, refunds, combined funding and the documents you should receive before paying. Speak to Simple Green Energy .
Check the details before paying
Your provider should clearly explain the project cost, available ECO4 funding, customer contribution, payment schedule, cancellation rights, refund conditions, guarantees and the work included.
Discuss your ECO4 contributionFinal Thoughts on Customer Contributions for ECO4
An ECO4 customer contribution is not automatically unfair, but it is not automatically required for every project either. Eligibility for the scheme and receiving a fully funded installation are two different things.
ECO4 now runs until 31 December 2026, but the existing obligation targets were not increased. This means funding may be more selective during the extension period, depending on the supplier, property and proposed measures.
Before accepting or rejecting a contribution, review the complete scope of work, funding applied, payment terms, guarantees, exclusions and refund conditions. Ask the provider to explain clearly how the project cost, ECO4 support and your contribution fit together.
Written details matter more than verbal promises. Take time to understand the offer and avoid making a payment under pressure.
