Retrofit: The Key to Solving the UK Energy Crisis

The UK is in the middle of an energy crisis, and millions of people are feeling the strain. Energy bills have skyrocketed, making it harder for people to keep their homes warm and affordable. At the same time, there are thousands of houses across the country sitting empty because they’re simply too cold, damp, or expensive to heat. While building new homes is one way to tackle the issue, it’s slow, costly, and not always the most sustainable option. The real opportunity lies in making the homes we already have more energy-efficient—and that’s where retrofit comes in.

Over the past four years, UK energy prices have soared. In October 2021, the energy price cap went up by 12%, followed by a massive 54% jump in April 2022. By October 2022, prices were set to rise by 80%, though government intervention softened the blow slightly. As of January 2025, the price cap sits at £1,738 per year for a typical household, up 1.2% from the last quarter. These staggering increases make it clear: reducing energy demand through better insulation and heating systems is no longer just a ‘nice to have’—it’s essential.

Graph showing cost per Megawatt-hour since January 2016. Statistics courtesy of Statista.com

How Retrofit Can Cut Energy Use and Bills

There are around 8.5 million homes in the UK that don’t meet basic Decent Homes Standards. Many are structurally sound but suffer from poor insulation, damp problems, and outdated heating systems. The result? Huge energy waste and unmanageable heating bills.

Retrofitting these homes—upgrading insulation, replacing inefficient heating systems, and sealing heat leaks—can drastically cut energy use. Research by the Green Alliance suggests that retrofitting can reduce 80% of carbon emissions compared to building new homes, all while making properties warmer and cheaper to run.

For councils and landlords managing large housing stocks, this presents a win-win: better-quality homes and lower operating costs. A properly retrofitted home can cut energy bills by up to £1,000 per year, making a huge difference to tenants. Homes with an Energy Performance Certificate (EPC) rating of F cost around £340 more per year to heat compared to those that meet government insulation standards. In fact, poor insulation can push up energy costs by around 50% compared to well-insulated homes.

What’s even more striking is how much heat loss occurs in poorly insulated buildings. Around 35% of heat is lost through walls, while 25% escapes through the roof. Tackling these inefficiencies with proper insulation and modern heating technology is one of the most effective ways to bring down energy consumption.

Graphic showing energy price comparison between EPC ratings. Statistics courtesy of Rightmove.com

Transforming Homes at Scale

At Target Green, we have seen first-hand how retrofit can dramatically cut energy consumption and reduce household bills. Many of our recent projects involve large-scale retrofit of properties that have been left in disrepair due to poor insulation and failing heating systems.

Through a combination of external wall insulation, air-source heat pumps, and triple-glazed windows, alongside other energy efficiency measures, we are able to bring these homes up to modern efficiency standards.

This isn’t just about making buildings more efficient—it’s about reducing the overall energy demand of the UK’s housing stock. By prioritising retrofit, councils and housing associations can play a pivotal role in tackling the energy crisis while ensuring long-term cost savings.

The Future: Why the UK Needs to Prioritise Retrofit

If we’re serious about tackling the energy crisis, the UK needs to invest heavily in large-scale retrofit projects. The government has made some progress, with initiatives like the Social Housing Decarbonisation Fund and ECO4 Scheme helping to get things moving.

But we need to go further. With the right policies and incentives in place, we could bring thousands of homes up to modern efficiency standards, dramatically cutting energy use across the country.

Target Green is leading the charge. We work with councils and property owners to deliver large-scale retrofit projects that cut emissions, reduce energy bills, and extend the lifespan of existing housing stock. The energy crisis isn’t just about generating more power—it’s about using what we already have more efficiently. And that starts with retrofit.