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ECO4 Flex may allow some low-income or vulnerable households to access funded home energy improvements even when they do not qualify through the standard benefits route.
Check Your EligibilityCurrent status: ECO4 Flex is part of the wider ECO4 scheme. ECO4 installations are currently scheduled to be completed by 31 December 2026. Local authority participation, referral routes and funding availability can vary by area.
Answer a few questions about your property, income, and household circumstances to see if ECO4 Flex may be a relevant route for you.
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ECO4 Flex is a component of the ECO4 scheme that allows participating local authorities or energy suppliers to identify households eligible for funded energy efficiency improvements through alternative criteria. It is designed to reach people who are fuel poor, on a low income, or vulnerable to cold — but who do not receive the standard qualifying benefits.
Where a local authority participates, it publishes a Statement of Intent setting out its ECO4 Flex criteria. A household that meets these criteria may receive a referral or declaration, which an installer or energy supplier can then use as the basis for a funding application.
Standard ECO4 eligibility typically requires the householder to receive one or more qualifying means-tested benefits (such as Universal Credit, Pension Credit, or Income Support). ECO4 Flex removes this requirement and instead allows eligibility to be established through:
The funded measures available are the same as standard ECO4. The difference is how the household demonstrates eligibility.
Yes, potentially. ECO4 Flex exists specifically to provide an alternative for households that do not receive qualifying benefits. However, not receiving benefits does not in itself make you eligible. You must still meet the specific criteria set by a participating local authority or supplier, and your property must also meet the scheme’s EPC and technical requirements.
The eligibility checker on this page can help indicate whether ECO4 Flex criteria may be relevant to your circumstances.
One common ECO4 Flex route applies to households with a combined gross annual income below £31,000. This figure is referenced in Ofgem guidance, though local authorities may apply different thresholds or additional criteria.
Important: A household income below £31,000 does not automatically guarantee ECO4 Flex eligibility. The property must also meet EPC requirements, the local authority must participate, and a supplier must agree to fund the work. Income is one factor among several.
Some households may qualify through ECO4 Flex where a member has a severe or long-term health condition that may be worsened by living in a cold home. Conditions that local authorities may consider include:
The specific conditions considered and the evidence required vary by local authority. Medical documentation or a GP referral may be requested in some areas.
Beyond specific medical diagnoses, local authorities may consider a broader range of vulnerability indicators. These can include:
Not all local authorities use the same vulnerability criteria. The relevant Statement of Intent should confirm what applies in your area.
ECO4 Flex uses the same property requirements as standard ECO4:
The property must also be capable of achieving at least a two-band EPC improvement through the proposed measures. An installer survey confirms this during the assessment stage.
ECO4 Flex supports the same range of measures as standard ECO4. Available measures depend on the property survey, supplier funding and current scheme rules.
Loft insulation
Where existing insulation is absent or below minimum depth
Cavity wall insulation
For properties with unfilled cavity walls
Solid wall insulation
Internal or external insulation for solid-walled homes
Room-in-roof insulation
Insulating converted loft spaces
Underfloor insulation
For properties with suspended timber floors
Heating controls
Programmers, thermostats, TRVs and smart controls
First-time central heating
For properties without any central heating system
Boiler repair or replacement
Where existing boiler is broken or condemned
Air-source heat pumps
Renewable heating where appropriate
Other whole-house measures
Additional measures contributing to EPC uplift
The specific measures installed depend on what is technically appropriate for the property and what achieves the required EPC uplift. Not every measure is available for every property.
No. Participation in ECO4 Flex is not mandatory for local authorities. While many councils do publish a Statement of Intent and accept Flex referrals, coverage varies across England, Scotland, and Wales.
Where a council participates, its criteria and referral process may differ from neighbouring authorities. Some councils handle referrals directly, while others work through installers or third-party organisations. If your local authority does not participate, an energy supplier may still operate its own Flex route in some circumstances.
Yes. Owner-occupiers who meet ECO4 Flex criteria and whose property has a qualifying EPC rating (generally D, E, F or G) can apply. There is no mortgage requirement. The key factors are your household circumstances (income, health, or vulnerability), your property’s energy efficiency, and whether a participating authority or supplier will issue a referral.
Private tenants may qualify for ECO4 Flex if they meet the household criteria. The tenant is typically the applicant. However, the landlord must normally give written consent before measures can be installed in the property.
Yes. For privately rented properties, the landlord must provide consent before any ECO4 measures are installed. This applies regardless of whether the tenant qualifies through the standard benefits route or through ECO4 Flex. Some landlords welcome the improvements as they enhance the property’s EPC rating at no cost to them.
No. ECO4 Flex is specifically designed to widen access beyond the normal qualifying-benefits route. If you do not receive benefits such as Universal Credit, Pension Credit, or Income Support, ECO4 Flex may provide an alternative path based on household income, health, or vulnerability.
However, not receiving benefits does not automatically make you eligible through Flex. You still need to meet the specific criteria published by a participating local authority or energy supplier, and your property must meet the scheme’s EPC requirements.
EnergyChecker.co.uk does not issue ECO4 Flex declarations. Declarations are issued by participating local authorities or, in some cases, directly by energy suppliers.
Check Your EligibilityAfter a local authority or supplier issues an ECO4 Flex referral or declaration, the next steps are:
No. A local authority referral or Flex declaration confirms that the household meets the eligibility criteria, but it does not guarantee that an energy supplier will fund the work. Final approval depends on:
Use the free eligibility checker on this page to get an initial indication of whether ECO4 Flex criteria may be relevant to your household. The checker considers your income situation, property type, EPC rating, and other factors.
Remember that an online eligibility check is an indication only. Final eligibility is confirmed through a participating local authority or supplier, followed by an installer property assessment.
Be cautious of callers who guarantee ECO4 Flex approval, claim to represent your council without evidence, request unusual upfront payments or pressure you to sign immediately.
EnergyChecker.co.uk is an independent guidance website. We are not a government body, council, energy supplier or installer. For official information, see:
Government energy grants eligibility checker
Check all available UK schemes
ECO4 scheme guide 2026
Full ECO4 eligibility and measures guide
Insulation grants UK 2026
Loft, cavity and solid wall support
Boiler grants UK 2026
Boiler replacement funding options
Heat pump grants UK 2026
All heat pump funding routes
ECO4 scams guide
Spot fake offers and stay safe
Energy Checker home
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EnergyChecker.co.uk provides general guidance and an initial eligibility indication only. ECO4 Flex rules, local participation and referral routes can vary. A referral or declaration does not guarantee funding, installation or approval.
ECO4 Flex is part of the ECO4 scheme that allows participating local authorities or energy suppliers to identify households that may be fuel poor, on a low income, or vulnerable to living in a cold home — even where the standard qualifying-benefits route does not apply. It widens access to funded energy efficiency improvements for households that might otherwise fall outside the main eligibility criteria.
Potentially, yes. ECO4 Flex is specifically designed to provide an alternative eligibility route for households that do not receive qualifying means-tested benefits. However, you must still meet the Flex criteria set by a participating local authority or supplier, and your property must also meet the scheme’s requirements.
One common route requires a combined gross household income below £31,000 per year. However, income alone does not guarantee eligibility. Criteria may vary by local authority, and other factors such as property EPC rating and household vulnerability are also considered.
Conditions that may be worsened by living in a cold home can be relevant. These may include cardiovascular conditions, respiratory illness (such as asthma or COPD), limited mobility, immunosuppression, and mental health conditions affected by cold or damp housing. The specific criteria are set by the local authority or supplier.
No. Participation in ECO4 Flex is not mandatory for local authorities. Some councils actively operate Flex referral routes, while others may not. Where a council does participate, it publishes a Statement of Intent setting out its criteria. Coverage and approach vary across England, Scotland and Wales.
Pensioners may qualify through ECO4 Flex if they meet the relevant criteria. Many older people living on low incomes or with health conditions worsened by cold housing may be considered vulnerable under Flex criteria. Receiving Pension Credit may also qualify through the standard ECO4 benefits route.
Yes. Private tenants may be eligible for ECO4 Flex support if they meet the household criteria. However, the landlord must normally provide written consent before any measures are installed. The tenant is typically the applicant.
No. A local authority referral or declaration confirms that the household meets the Flex eligibility criteria, but it does not guarantee that an energy supplier will fund the work. Final approval depends on supplier funding availability, property suitability, installer assessment, and current scheme rules.
ECO4 Flex can support the same range of measures as standard ECO4, including loft insulation, cavity wall insulation, solid wall insulation, heating controls, boiler replacement, first-time central heating, and heat pumps. Available measures depend on the property assessment and what contributes to the required EPC uplift.
Start by checking your eligibility online. If you appear to meet Flex criteria, a referral is typically made through a participating local authority, an installer working with a local authority, or an energy supplier operating a Flex route. An installer then assesses the property and applies for funding on your behalf.
Yes. ECO4 Flex is a legitimate part of the government-mandated ECO4 scheme, regulated by Ofgem. However, scams do exist — be cautious of unsolicited callers guaranteeing Flex approval, claiming to represent your council without evidence, or requesting unusual upfront payments.
Take 60 seconds to check whether you may qualify for ECO4 support without receiving traditional benefits.
Check Your Eligibility