EPC Rating G: The Lowest Rating and the Biggest Opportunity

G is the lowest EPC rating. It means your home is the least energy efficient on the scale. It also means you have the most room to improve, and the biggest difference to feel once the work is done.

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What does an EPC G rating mean?

G covers scores of 1 to 20 points on the SAP scale. Homes rated G often have very little insulation, an old or inefficient heating system, or no central heating at all. They can be cold in winter and costly to heat.

Can I get a grant with an EPC rating G?

Yes, G is within the ECO4 range. For owners and private tenants, the key question is whether you meet the other rules.

You receive a qualifying benefit, or
Your council refers you through LA Flex, for example because of a low household income or a health condition made worse by cold

If you rent privately you also need your landlord’s permission. ECO4 is due to close on 31 December 2026, so ask early.

Homes with no central heating

Some G-rated homes have no central heating at all. First time central heating is one of the larger upgrades that ECO4 can cover for homes that qualify. See our first time central heating page for how it works.

Is a G-rated home lettable?

Rented homes in England and Wales generally need an EPC rating of E or better, unless an exemption applies. A G-rated home will need improving before it can usually be let.

What to do first

Press "Check if I qualify" and we will check your options and book a free home survey.

Frequently asked questions

Is G the worst EPC rating?

Yes. G is the lowest band on the A to G scale.

Can I get ECO4 help with a G rating?

Yes, if you also meet the benefit rules or are referred by your council. A G rating is within the range ECO4 is aimed at.

Can a G-rated home be rented out?

A G-rated home normally needs improving first. The usual minimum for letting in England and Wales is an E, with limited exemptions.

What upgrades help a G-rated home most?

It depends on the home. Insulation and a proper heating system are the usual starting points. A survey shows what will make the biggest difference.