The ECO4 scheme is funded through a legal obligation placed on the UK’s largest energy suppliers, not directly from general taxation or household bills. Ofgem reports that the Energy Company Obligation (ECO) is financed by a levy on energy suppliers, which they pass on to all domestic customers through standard energy bills (Ofgem, 2026). Every household that pays an energy bill contributes a small amount, typically around £20–£30 per year, to fund the scheme.
The total annual budget for ECO4 is approximately £1 billion, allocated across the four-year scheme ending in March 2026 (GOV.UK, 2026). This funding covers the full cost of qualifying energy-efficiency measures for low-income and vulnerable households, including insulation, heating upgrades, and renewable technologies. The amount each supplier must contribute is calculated based on their market share of domestic energy customers.
Energy suppliers fund the entire cost
Under ECO4, obligated energy suppliers, such as British Gas, EDF, E.ON, Octopus Energy, and Scottish Power, must deliver energy-saving measures to eligible households at no upfront cost to the homeowner. The supplier pays for the installation directly, and the cost is recovered through the levy on all customers’ bills. The Department for Energy Security and Net Zero states that suppliers are legally required to meet their ECO4 targets or face financial penalties (GOV.UK, 2026). This means the scheme is effectively industry-funded, not a government grant in the traditional sense.
Households contribute through energy bills
Every domestic energy customer in Great Britain pays a small annual levy to fund ECO4, regardless of whether they receive support. Ofgem calculates the levy as part of the supplier’s overall cost, which is then reflected in unit rates or standing charges (Ofgem, 2026). For example, a typical household pays around £20–£30 per year through their bill. This collective contribution means the cost is spread across millions of customers. That makes it affordable per person while funding large-scale home improvements for those who need them most.
No direct government tax revenue is used
Unlike schemes such as the Boiler Upgrade Scheme or the Great British Insulation Scheme, ECO4 does not draw directly from government tax receipts. Instead, it is a regulatory obligation on energy suppliers, enforced by Ofgem. The Energy Saving Trust confirms that ECO4 is a supplier-led obligation, meaning the government sets the rules but the suppliers bear the delivery cost (Energy Saving Trust, 2026). This structure ensures the scheme is self-funding and does not compete with other public spending priorities, while still targeting fuel-poor and low-income households for free energy upgrades.
A worked example
A typical 3-bedroom semi-detached house in Manchester, built in the 1970s, could receive a full ECO4-funded package worth £14,000 at no upfront cost to the homeowner. This package includes cavity wall insulation, loft insulation top-up to 300mm, a new A-rated gas boiler, and smart heating controls. According to the Energy Saving Trust, the combined measures would reduce annual heating bills by approximately £580 and cut carbon emissions by 1,400 kg CO2 per year. The household’s EPC rating would jump from a D to a B, adding an estimated £8,000 to the property’s resale value. Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6). The homeowner qualifies because their household income is under £31,000 and they receive means-tested benefits.
| Item | Figure |
|---|---|
| Upfront cost after grants | £0 |
| Yearly savings | £580 |
| Payback period | Immediate |
| 25-year lifetime savings | £14,500 |
What homeowners often get wrong
The most common mistake is believing ECO4 is a government grant you apply for directly, when in reality it is a supplier obligation you access through a registered installer. Here are three frequent pitfalls to avoid.
- Thinking you must pay upfront and claim back Many homeowners assume ECO4 works like a cashback scheme where you pay the installer and then reclaim the cost. In fact, the energy supplier pays the installer directly, and you should never pay a penny upfront for qualifying measures.
- Assuming all energy suppliers offer the same service Some people think any supplier will handle their ECO4 application the same way. The reality is that each obligated supplier has its own delivery partners and criteria, so you may need to approach a specific supplier or use an accredited installer who works with multiple suppliers to find the right match for your home.
- Believing the scheme is only for the unemployed A widespread myth is that ECO4 only helps people on out-of-work benefits. In truth, eligibility extends to households with a gross annual income under £31,000, even if both adults are in full-time work, which means thousands of working families miss out because they do not apply.
Quick reference
- The total annual budget for ECO4 is approximately £1 billion, funded through a levy on energy bills rather than general taxation.
- Every UK household pays roughly £20 to £30 per year through their energy bill to fund the ECO4 scheme, regardless of whether they use it.
- To qualify for ECO4, your household must have a gross annual income under £31,000 or receive one of several means-tested benefits such as Pension Credit or Universal Credit.
- The average ECO4 package covers insulation, heating upgrades, and renewable technologies worth between £5,000 and £20,000 at no cost to the homeowner.
- If you are a private tenant, you need written permission from your landlord before any ECO4-funded work can proceed, and the property must have an EPC rating of E, F, or G.
Frequently Asked Questions
ECO4 is funded through a legal obligation on the UK's largest energy suppliers, who pass the cost to households via energy bills. Ofgem reports the levy adds roughly £20–£30 per year per customer.
Yes, every household paying an energy bill contributes a small amount, typically £20–£30 per year, to fund the ECO4 scheme. This levy is included in standard energy bills.
Obligated energy suppliers like British Gas and E.ON pay for ECO4 installations directly. They recover the cost through the levy on all domestic customers' bills, as confirmed by GOV.UK.
