ECO4 Solar Panels — Free Solar for Qualifying UK Households

The ECO4 scheme is the UK government’s main fuel poverty programme, and it offers free or heavily subsidised solar panels to qualifying households. Unlike most solar incentives which require you to pay upfront and earn back over time, ECO4 provides grant-funded installations to eligible low-income homeowners and private renters, funded through energy supplier obligations. If you meet the criteria, you could receive a full solar panel installation at no cost.

This guide explains exactly who qualifies, how the scheme works in 2026, what you receive if eligible, and how ECO4 compares to other available grants like the Boiler Upgrade Scheme and 0% VAT relief. If you don’t qualify for ECO4, we also explain what other options are available.

Important: ECO4 is scheduled to close in December 2026. If you think you might qualify, it is worth applying as soon as possible. Energy suppliers are still obligated to deliver installations under the scheme up until the deadline, but waiting lists are growing and survey slots are filling up quickly in many areas.

Key Takeaways

• ECO4 is a government-mandated scheme requiring large energy suppliers to fund energy efficiency improvements for low-income and vulnerable households.
• To qualify, you must receive certain means-tested benefits OR live in a property with an EPC rating of D, E, F, or G.
• ECO4 typically funds insulation measures first, with solar panels as a secondary measure for properties that meet certain criteria after insulation.
• The Local Authority Flexible Element (LA Flex) allows councils to extend ECO4 to households who don’t receive qualifying benefits but have low incomes.
• ECO4 runs until March 2026, though the government is expected to announce a successor scheme.
• If you don’t qualify for ECO4, the 0% VAT on solar panels (until March 2027) and the Boiler Upgrade Scheme (£7,500 for heat pumps) are the main alternatives.

What Is the ECO4 Scheme?

ECO4 stands for Energy Company Obligation, fourth phase. It is a legal obligation placed on large UK energy suppliers (those with 150,000+ customers) to fund energy efficiency upgrades for vulnerable and low-income households. The energy suppliers fund the scheme and recover costs through consumer energy bills across all their customers.

The scheme is administered by Ofgem, which sets the rules and targets. Individual energy suppliers then work with approved installers and local authorities to identify eligible properties and deliver the upgrades. The current ECO4 phase runs from April 2022 to March 2026, with a total budget of around £4 billion.

Previous ECO phases focused primarily on insulation. ECO4 has a broader scope that includes solar panels, heat pumps, storage heaters, and other measures, though the hierarchy of measures means insulation typically takes priority, with solar considered for properties that already have adequate insulation.

Who Qualifies for ECO4?

ECO4 eligibility is determined by two pathways: the benefits-based route and the EPC-based route via Local Authority Flex.

Benefits-Based Route

You may qualify if you or someone in your household receives any of the following:

• Universal Credit (UC)
• Income-related Employment and Support Allowance (ESA)
• Income-based Jobseeker’s Allowance (JSA)
• Income Support
• Working Tax Credit
• Child Tax Credit (where not receiving other specified benefits)
• Pension Credit Guarantee Credit
• Housing Benefit
• Child Benefit (subject to income thresholds)

For Child Benefit eligibility, income thresholds apply. As of 2026, the thresholds are £31,000 for a single-adult household with one child, rising with additional children. These figures are updated periodically so check with the scheme administrator for current limits.

Local Authority Flex (LA Flex)

Local councils can extend ECO4 eligibility to households that don’t receive qualifying benefits but are in fuel poverty or have low incomes. Criteria vary by council, but LA Flex typically covers households earning below a certain income threshold (often around £31,000) living in properties with EPC ratings of D or below. Contact your local council’s energy or housing team to check whether you might qualify under LA Flex.

Property EPC Requirements

Regardless of which eligibility route you use, your property typically needs to have an EPC rating of D, E, F, or G to qualify. Most ECO4 work targets E, F, and G-rated homes, which are the least energy-efficient. If your property already has a high EPC rating (A, B, or C), ECO4 funding is generally not available because the scheme prioritises the worst-performing homes.

Does ECO4 Cover Solar Panels?

Yes, solar panels are an eligible measure under ECO4, but they are not the primary focus and are typically only funded as part of a broader energy improvement package. The ECO4 scheme uses a “whole-house approach” which means an eligible property must receive insulation measures (loft insulation, cavity wall insulation, or solid wall insulation) before or alongside other improvements like solar panels.

In practice, this means solar panels through ECO4 are most commonly available to properties that either already have adequate insulation or are receiving insulation as part of the same ECO4 package. A property with no insulation improvements needed (already well-insulated) may qualify for solar directly. Properties that need significant insulation work may receive insulation first, with solar as a follow-on measure.

Not all ECO4 installers offer solar panels. The scheme is delivered through a patchwork of energy suppliers and their approved contractors, and availability varies significantly by region and installer. Some areas have much better ECO4 solar panel availability than others.

How to Apply for ECO4

There is no single national ECO4 application portal. Instead, you apply through one of several routes. The simplest is to contact your energy supplier directly and ask whether you qualify for ECO4 measures. All large energy suppliers are obligated to have referral processes. You can also use the Simple Energy Advice (SEA) service at simpleenergyadvice.org.uk, which is the government’s official guidance site and includes a referral service for ECO4.

Your local council is another route, particularly if you might qualify under LA Flex. Many councils have dedicated energy efficiency teams who carry out property assessments and refer eligible households to approved installers. Citizens Advice also operates an energy advice service that can help determine eligibility and navigate the application process.

Once referred, an approved ECO4 installer visits to assess the property and confirm eligibility and suitable measures. You do not pay the installer directly. The installer recovers their costs from the energy supplier under the ECO4 obligation.

What Is Included in an ECO4 Solar Panel Installation?

ECO4-funded solar installations typically include the panels themselves, the inverter, mounting hardware, and connection to the property’s consumer unit. The exact specification depends on the installer and the property, but systems of 3–4kWp are most common for domestic properties. MCS certification should be included as standard, which means the installation qualifies for the Smart Export Guarantee.

Battery storage is not routinely included in ECO4 solar installations, though some suppliers offer it as part of enhanced packages or under separate grant funding. The Home Upgrade Grant (Warm Homes Local Grant) in some areas covers battery storage alongside solar.

ECO4 vs Other Solar Grants Available in 2026

If You Don’t Qualify for ECO4

Most UK homeowners will not qualify for ECO4 because they don’t receive qualifying benefits and their property has an adequate EPC rating. For those who don’t qualify, the most significant incentive available in 2026 is the 0% VAT rate on solar panel and battery storage installations, which is in force until at least March 2027. On a typical £8,000 solar plus battery installation, this saves £1,600 compared to the standard 20% VAT rate.

The Smart Export Guarantee provides ongoing income after installation, paying 8–15p per kWh of surplus electricity exported to the grid. Octopus Energy’s Outgoing tariff at 15p/kWh is currently the most generous available. On a 4kWp system, SEG income runs to £120–£200 per year without battery storage.

For homes without a gas connection (off-grid rural properties), the Warm Homes Local Grant is available in some areas, offering up to £30,000 for energy efficiency improvements including solar panels and heat pumps. Availability depends on local council participation and funding allocation.

Case Study: Nottinghamshire Homeowner, ECO4 Solar Installation

Background

A single parent in Nottinghamshire receiving Universal Credit contacted their energy supplier about ECO4 after receiving a leaflet from their council. The three-bedroom terrace had an EPC rating of E and no cavity wall insulation.

Project Overview

An ECO4 assessment confirmed eligibility. The approved installer fitted 80mm cavity wall insulation throughout the property and a 3.2kWp solar panel system consisting of 8 panels. Both measures were fully funded. The total value of work carried out was estimated at £5,800.

Implementation

Installation took two days. The solar panels were MCS-certified and the installer registered the system under the Smart Export Guarantee with the homeowner’s energy supplier. A SMETS2 smart meter was installed the following month, enabling both time-of-use tariff access and export meter readings.

Results

Annual electricity bill reduced by approximately £420. SEG income of £85 per year adds further benefit. Combined annual saving: £505, at zero upfront cost. The cavity wall insulation reduced heating costs by a further estimated £200 per year. Total annual household energy saving: approximately £705, all funded under ECO4.

Expert Insights From Our Solar Panel Installers About ECO4

“ECO4 solar is genuinely life-changing for households that qualify, but the process can be frustrating because the scheme is fragmented between dozens of suppliers and installers and there’s no simple national portal. My advice is to contact your energy supplier first, then your council, and persist. A lot of eligible households don’t apply because they assume they don’t qualify or find the process opaque. If you receive any qualifying benefit and have an EPC of D or lower, you very likely qualify for something,” says one of our senior solar panel installers with over 11 years of UK residential experience.

Frequently Asked Questions

Summing Up

ECO4 offers genuinely free solar panel installation for qualifying low-income and vulnerable households, funded by energy supplier obligations. If you receive Universal Credit, Pension Credit, or other qualifying benefits and have an EPC of D or lower, you may be eligible for a fully funded solar system worth £5,000–£8,000. Contact your energy supplier or local council to find out. If you don’t qualify for ECO4, the 0% VAT rate and Smart Export Guarantee still make solar installation an excellent financial decision. Contact us for a free quote whether you’re seeking ECO4 or a standard MCS-certified installation.

Updated May 2026