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Navigating the Impact of Document L for the Solar Industry

Document L is set to bring about changes that will impact those considering solar panels

In recent times, renewable energy has emerged as a beacon of hope in the fight against climate change. Solar panels, in particular, have gained significant popularity among homeowners, property developers, and builders looking to embrace sustainable practices. However, a recent Government directive, known as Document L, is set to bring about changes that will impact those considering solar panels, as well as those who already have them. In this article, we will explore the implications of Document L for homeowners, builders and those working in the new build property sector.

Building Regulations Part L covers the conservation of fuel and power in the building of new homes in England and establishow energy-efficient new and existing homes should be.

From 15 June 2022 there was an important update to Part L which states that all new homes must produce 31% less carbon emissions than what was acceptable in the existing Part L regulations. The regulations now come into force in June 2023 and affect anyone undertaking a home improvement project, extension, renovation or self-build and also impact new home builders, so here’s what you need to know about Part L, the regulations, and how the changes will apply.

1. Homeowners:

For existing homeowners, Document L introduces exciting opportunities to maximize the benefits of solar panels. The new regulations highlight the importance of retrofitting properties with energy-efficient measures, encouraging homeowners to invest in solar panels to improve their homes’ energy performance. By harnessing the power of solar energy, homeowners can reduce their reliance on the grid, work towards lowering their energy bills, and make a positive impact on the environment.

It is important to note that homeowners should consult with qualified solar installers to ensure their systems comply with the latest standards outlined in Document L. The changes could affect anyone undertaking a home improvement project, extension, renovation or self-build, so it’s important to understand Part L and to consult with qualified solar installers to ensure systems comply with the latest standards.

2. Builders

Document L marks a turning point for builders undertaking projects such as extensions, conservatories and roof overhauls, as it sets stricter energy efficiency standards for new constructions. Under the new regulations, developers will be required to incorporate renewable energy solutions, such as solar panels, into their projects to achieve higher energy efficiency ratings. This will not only contribute to reducing the carbon footprint of buildings but also align with the growing demand for eco-friendly properties. As such, builders and developers who invest in solar panels and other sustainable technologies will position themselves as forward-thinking, environmentally conscious leaders in the industry.

3. New Build Property Developers

With Document L in place, new build properties are expected to reach even higher levels of energy efficiency. Developers will be required to integrate solar panels as a standard feature in their designs, ensuring that each new home contributes to renewable energy generation. By doing so, new build properties will not only enjoy reduced energy costs but also could increase their market value, as sustainability becomes an increasingly important consideration for potential buyers. The inclusion of solar panels in new build properties will pave the way for a greener future and establish a new standard for sustainable construction.

How can Solar Panels Help?

While solar panels aren’t the only option available to developers, they are widely acknowledged to be the most efficient way to achieve compliance, both with the Part L Uplift and the forthcoming Future Homes Standard expected in 2025. Solar is an established and mature technology that’s widely tested and readily available. It can be easily integrated into house roofs without creating additional load, as well as reducing the number of roof tiles needed, which are currently in short supply.
Unlike heat pumps, solar PV is low maintenance and requires little interaction with the homeowner from a usability perspective. It’s also an increasingly attractive value-add for today’s homeowners, and most housebuilders know that in today’s climate, sustainability has featured much more in buying decisions. As well as looking at how nice the kitchen is, how many bedrooms it has or where it is, future buyers will look at how energy efficient the building is, and the impact it’ll have on their energy bills.
Having solar is now as desirable a feature as super-fast broadband, making it a technology that not only meets regulations but that homeowners actually want. Additionally, as more consumers switch to hybrid or electric cars and install EV charging points ahead of the ban on new petrol and diesel cars in 2030, the ability to generate their own electricity will be of tangible value.


Document L is undoubtedly a game-changer for the solar panel industry, paving the way for a greener, more sustainable future. While the regulations present certain challenges, they also offer significant opportunities for builders, property developers, and homeowners alike. Embracing solar panels and other renewable energy solutions aligns with the urgent need to combat climate change and reduce carbon emissions. By leveraging these technologies, we can create a more sustainable built environment and safeguard the well-being of future generations.

Part L forces the construction industry to look at alternative ways of doing things, in order to meet the stringent targets, set out in the updated Building Regulations.
Although there are a number of ways that these targets can be met, currently one of the most cost-effective ways is by utilising a combination of an efficient gas boiler along with a solar photovoltaics (PV) system on the roof. Almost 1 million UK homes have already gone solar, and levels of public support are high, so it is likely that solar power will significantly contribute to the UK’s reliable green energy resource. As CEO of Project Solar UK, I encourage all stakeholders to view Document L as a catalyst for positive change. Let us seize this opportunity to propel the adoption of solar panels forward, embrace sustainable practices, and contribute to a cleaner, brighter future for all.