When investing in Solar PV Systems for your home or business, one of the most important decisions is choosing between In-Roof and On-Roof Solar Panel Systems. While both options allow you to generate renewable energy and cut electricity costs, they differ in terms of design, installation process, efficiency, and aesthetics. Making the right choice depends on your specific property needs, budget, and future plans. Understanding the key differences between these systems can help you make a more informed, long-term investment in solar energy.

At Barri Davies Electrical Ltd, we help property owners across West Wales make smart solar choices tailored to their buildings. Whether you’re retrofitting an existing roof or planning a new build, knowing the pros and cons of In-Roof and On-Roof Solar PV Systems ensures your investment delivers the best value and performance. Let’s explore both systems in detail and how they can benefit your home or business!

What Are In-Roof Solar PV Systems?

In-Roof Solar PV Systems are integrated into the roof itself, replacing the roof tiles or slats. Instead of mounting panels above the existing roof, the panels become part of the structure. This sleek and modern look is increasingly popular, especially in new builds or major renovations. They sit flush with the roof surface, offering a more seamless appearance.

Because In-Roof Solar Panels act as both energy generators and roofing material, they can reduce the need for additional roofing costs in new constructions. In addition to being space-saving, In-Roof Solar PV Systems are less intrusive and often favoured in areas where planning aesthetics are a concern. However, they may require more specialised installation and can be slightly less efficient due to reduced air flow beneath the panels, which can affect cooling.

What Are On-Roof Solar PV Systems?

Now getting on to In-Roof’s main counterpart, On-Roof Solar PV Systems are the most commonly seen setup in the UK. In this setup, panels are mounted onto brackets that sit above the existing roof covering. This allows better air flow behind the panels, helping to keep them cool and maximise performance. It’s an especially popular option for retrofitting homes and commercial buildings.

Installation is typically quicker and more cost-effective than In-Roof Solar PV Systems, as it doesn’t require removing or replacing roofing material. The slight elevation can make maintenance and repairs easier, and they tend to have a longer track record in terms of reliability. The trade-off is that the panels are more visible, which can be a consideration for some homeowners who want to keep their home looking sleek and stylish, without any Solar Panels protruding from the roof.

Comparing The Performance & Efficiency Of In-Roof & On-Roof Solar Panels

When it comes to energy production, On-Roof Solar Panels often have the edge due to better ventilation. Since Solar Panels perform more efficiently when they remain cool, the air gap in On-Roof Solar PV Systems helps reduce heat buildup. This can lead to slightly better overall energy output, especially in warmer weather or summer months.

In-Roof Solar Panels, however, can experience more heat retention due to their flush design, which can lead to reduced efficiency over time. With that being said, the difference is relatively small, and many modern In-Roof Solar PV Systems are designed to mitigate heat loss with improved airflow components. It’s worth noting that In-Roof options are improving in efficiency and design rapidly, thanks to advancing technology that will potentially allow them to encompass their On-Roof competitors in the years to come.

Cost & Installation Considerations!

One of the main factors to consider is cost. On-Roof Solar PV System installations are generally more affordable, especially for retrofit projects. The process is faster, simpler, and requires fewer alterations to your existing roof. On the other hand, In-Roof Solar PV Systems can be more cost-effective for new builds, as they replace some of the roofing materials.

However, In-Roof Solar PV System installations often require more specialised labour and longer installation times, which can increase upfront costs. Maintenance may also be slightly more complex if the system needs repair, although these systems are designed to be long-lasting and durable. For both systems, long-term savings from reduced electricity bills remain a major benefit.

Aesthetic Appeal & Property Value

For many homeowners, aesthetics are a key consideration when choosing the right Solar PV System. In-Roof Solar PV Systems are designed to sit flush with the roofline, offering a sleek, modern finish that integrates seamlessly with the property’s design. This makes them a popular choice for new builds or major renovations where visual appeal is a priority. In areas with planning constraints, such as conservation zones or heritage properties, In-Roof Solar PV System installations are often viewed more favourably by local authorities due to their subtle appearance.

On the other hand, while On-Roof Solar PV Systems are more visibly mounted on top of existing tiles, they’ve become increasingly accepted in both residential and commercial settings. Innovations in panel frame design, slimmer profiles, and custom colour options now allow On-Roof Solar Panels to blend more harmoniously with a building’s exterior. Both systems offer the potential to increase property value by reducing energy bills, improving EPC (Energy Performance Certificate) ratings, and appealing to eco-conscious buyers looking for long-term sustainability benefits!

So, Which Solar PV System Is Right For Your Property?

Ultimately, the right choice depends on your property’s specifications, your budget, and what matters most to you – efficiency, aesthetics, or ease of installation. Here’s a simplified comparison to guide your decision:

☀️ Choose an In-Roof Solar PV System if you’re building a new home, value a minimal and integrated appearance, and are aiming for a premium, long-term solution that complies with strict planning guidelines.

☀️ Choose an On-Roof Solar PV System if you want a more cost-effective and energy-efficient option, with quicker installation times and greater flexibility for panel positioning, allowing you to have more freedom in the overall design of where the panels will be placed on your property’s roof.

Still unsure which is right for you? At Barri Davies Electrical Ltd, our expert team will be able to carry out a full assessment of your property’s roof and energy requirements to recommend the best system for your needs. Whether you’re prioritising visual harmony, maximum energy generation, or future scalability with battery storage, both options offer excellent performance, long-term savings, and durable warranties that bring peace of mind with every installation!

An Overview Of The Difference Between In-Roof and On-Roof Solar PV Systems & What Benefits Can They Each Provide Your Property?

Whether you might be leaning toward In-Roof or On-Roof Solar PV Systems, investing in solar energy is a forward-thinking decision that can pay off for decades. At Barri Davies Electrical Ltd, we specialise in designing and installing custom solar solutions that align with your property’s architecture and your energy goals.

Our team provides clear guidance on what’s best for your property, budget, and long-term plans. We take care of everything from initial consultation to professional installation and aftercare. Choosing between In-Roof and On-Roof doesn’t have to be a difficult decision – with expert support, the transition to renewable energy can be smooth, efficient, and financially rewarding.

Ready to explore your Solar PV System options? Then feel free to call our expert team of electricians today, and we’ll provide you with trusted advice about which Solar PV System is right for you, as well as provide you with a premium installation and lead you towards a greener future for your home or business!