ECO4 in Scotland 2026: Free Insulation and Heating Guide

What is ECO4?

ECO4 — the Energy Company Obligation in its fourth phase — is a UK-wide scheme that requires the largest energy suppliers to fund energy efficiency improvements in lower-income homes. In Scotland it operates alongside the Scottish-specific schemes, and for households that qualify it can deliver free insulation and heating upgrades at no cost.

ECO4 is a legal obligation placed on energy suppliers with more than 150,000 domestic customers. Those suppliers — including British Gas, EDF, E.ON, Octopus, OVO, Scottish Power and others — must spend a set amount funding efficiency improvements in homes that meet eligibility criteria. The current phase runs from April 2022 to March 2026.

The scheme is not administered by the government directly. Instead, eligible households access it through their energy supplier or through an ECO4-registered installer who checks eligibility on their behalf. Local authorities can also refer residents into ECO4 through a mechanism called ECO4 Flex.

The improvements funded under ECO4 are free to qualifying households. The energy supplier bears the cost as part of their regulatory obligation.

Who qualifies for ECO4 in Scotland

ECO4 targets lower-income households, primarily those receiving means-tested benefits. The qualifying benefits include:

Universal Credit; Income-based Jobseeker's Allowance; Income-related Employment and Support Allowance; Income Support; Housing Benefit; Pension Credit (Guarantee Credit); Child Tax Credit or Working Tax Credit with a household income below £31,000; Warm Home Discount Scheme (Core Group 1).

In addition, local authorities can refer households under ECO4 Flex — a more flexible eligibility route that allows councils to identify households in fuel poverty or with low incomes who may not receive the standard qualifying benefits. If you do not receive any of the above but have a low income and a poorly performing home, contact your local council energy team to ask about ECO4 Flex referrals.

Do you qualify for ECO4?

A simple way to think about it: do you receive qualifying benefits, is your home poorly performing, is it in a rural area or off the gas grid, and is your household on a low income? If yes to several of these, you may be likely to qualify.

If not, do not rule yourself out. ECO4 Flex allows local councils to refer some households that are in fuel poverty or have low incomes even when they do not receive the standard qualifying benefits.

The rural off-gas uplift in Scotland

This is a specifically important feature of ECO4 for rural Scottish households. Homes in Scotland that are off the gas grid and in rural areas receive an enhanced weighting in the ECO4 scoring system. Eligible rural households are more attractive to ECO4-registered installers because the measures delivered in their homes score more highly toward the installer's ECO4 obligation target.

In practical terms, if you live in a rural Scottish area, are off gas, and receive qualifying benefits, you are likely to find it straightforward to access ECO4-funded improvements. Installers are actively seeking these properties because of the favourable scoring.

What does ECO4 fund?

Insulation: the primary focus of ECO4. Loft insulation, cavity wall insulation, solid wall insulation (internal and external) and underfloor insulation are all fundable where appropriate to the property.

Heating upgrades: ECO4 can fund replacement boilers and heat pump installations where insulation alone is insufficient to meet the scheme's objectives. First-time central heating — providing full central heating to a home that currently has none — is also fundable in certain circumstances.

Park homes: mobile or residential park homes are eligible for ECO4 in specific circumstances.

How to access ECO4

Route one — Contact your energy supplier: ask about ECO4. Describe your benefits status and ask whether you qualify for funded improvements. Larger suppliers have dedicated teams handling ECO4 applications.

Route two — Contact an ECO4-registered installer: many insulation and heating companies are registered to deliver ECO4 works. They check your eligibility, arrange the survey and carry out the works. You can find registered installers through Ofgem ECO4 supplier contact details or Home Energy Scotland.

Route three — Local authority ECO4 Flex referral: contact your local council's energy or housing team and ask about ECO4 Flex. If you do not receive qualifying benefits but have a low income and a property with a low EPC rating, a council referral can open the ECO4 route.

How much could you save?

ECO4 improvements can make your home warmer, cheaper to run and better for the environment. Better insulation reduces heat loss, lowers energy bills, improves comfort and can lift a home from a typical D–G EPC band closer to A–C after major works.

The exact saving depends on the starting condition of the property and the measures installed, but the combination of lower bills, improved comfort and a higher EPC can be significant.

How ECO4 fits with Scottish schemes

ECO4 and the Home Energy Scotland schemes are separate and can in some cases be accessed together. A household qualifying for ECO4 through benefit receipt might also qualify for Warmer Homes Scotland — and HES would typically advise on which route delivers the most comprehensive package of measures.

For rural households, the combination of ECO4 off-gas uplift and HES rural uplift means that the funding available for significant works is substantial from multiple directions.

The general advice from Home Energy Scotland is to make a single contact and describe your full circumstances. They can identify all the schemes you may qualify for and advise on the most beneficial route rather than you having to navigate the schemes independently.

Important notes for Scotland

ECO4 is a UK-wide scheme administered under UK government rules, not Scottish Government rules. Eligibility criteria and funding levels are set by Ofgem rather than by Holyrood. The Scottish-specific schemes — Home Energy Scotland and Warmer Homes Scotland — operate in parallel and are separately funded.

For households that qualify for both ECO4 and Scottish schemes, the combination can deliver a comprehensive whole-home improvement package. For those who qualify for Scottish schemes but not ECO4, the HES grant and loan provides an accessible route regardless of income.