Start here
- ECO4 eligibility: who qualifies, route by route
- How to apply for ECO4
- ECO4 LA Flex: the four routes
- What is ECO4?
- ECO4 in Scotland
Guides
Is ECO4 still available?
Yes, until 31 December 2026. Why so many pages say it closed, and what the end date means for you.
ECO4 for pensioners
Pension Credit routes, ECO4 Flex for pensioners not on benefits, and applying for a relative.
Is ECO4 really free?
What Ofgem says about contributions, repayment and grant values, and five questions to ask before you sign.
ECO5: what is confirmed
What is official about the scheme after ECO4, and why waiting can cost you.
ECO4 qualifying benefits
The eight benefits on the list, the ones that are not (PIP, Attendance Allowance, State Pension) and what Flex can do instead.
What health conditions qualify for ECO4?
Flex Route 3 medical referrals and the wider NICE list for Route 2.
The ECO4 retrofit assessment
What the SAP/RdSAP assessment decides, how to prepare, and what to ask.
Back boiler replacement
Why a back boiler with one radiator can open first time central heating.
ECO4 solid wall insulation
External vs internal, the GOV.UK quality warning and what to check.
Is ECO4 legit?
Red flags, how to verify an offer, and where to complain.
How to find an ECO4 installer
Supplier contacts, TrustMark, PAS 2035 and the questions to ask.