All about solar panel installation: Process, costs & most popular questions answered.

Installing solar panels is a great way to harness solar energy and reduce your electricity bills. Making the switch to solar power is one of the best decisions you can make for your home, and your wallet. Who wouldn’t love lower electricity bills and the chance to do something good for the planet?

But let’s be real: figuring out how to get started can feel a little intimidating.

You’re probably wondering:

• How much will it cost?
• Is my roof even suitable?
• What does the installation process really involve?
• What about planning permission? Is it necessary?

It’s a lot to take in, and that’s totally normal.

The good news?

You don’t have to figure it out on your own. We’re here to break it all down and make the process as easy as possible for you.

Installing solar panels isn’t just about sticking a few panels on your roof. It’s about designing a system that works perfectly for your home – choosing the right panels, making sure your roof can handle it, and checking all the boxes for safety. Every step matters when it comes to getting the most out of your solar PV system.

Here’s what we’ll cover in this guide:

• How the solar panel installation process works from start to finish.
• What to consider before you begin, like roof suitability and system size.
• How to choose the right installer and what to expect during the process.

With Soly, going solar doesn’t have to be a complicated headache. Trust us, by the end of this guide, you’ll know precisely what to do so you can get started on your journey.

Let’s dive right in!

Is my roof suitable for installing solar panels?

First things first. Before you have your solar panels installed, you might be wondering this:

Is my roof suitable for solar panels?

Here’s your answer: Most roofs in the UK can support a solar system with the right setup. A south-facing roof is ideal for capturing the most sunlight, but east- or west-facing roofs can still generate plenty of energy. Even north-facing roofs might work with today’s efficient solar panels, though they’ll produce less electricity.

Your roof’s size, condition, and layout matter too. You’ll need enough clear space—around 20-30m² for a standard system—and a solid structure to handle the weight of the panels. Chimneys, skylights, or shading from trees and buildings can reduce efficiency, but solutions like trimming branches or using optimisers can help. Flat roofs or steeply pitched roofs aren’t a problem either; mounting systems can adjust the angle for maximum energy production.

In most cases, you won’t need planning permission unless your home is listed or in a conservation area. Checking early with your local planning office can save you hassle later. And while sunnier areas of the UK have an edge, today’s technology means even homes in cloudier regions can produce enough energy to lower electricity bills and boost energy independence.

Additionally, there’s no need to worry because professional solar installers will handle all these details. All the way from assessing your roof’s suitability to optimising your system for long-term performance, solar experts have you covered.

So whether your roof is flat, pitched, or somewhere in between, there’s likely a solar solution made just for you:

DIY vs. professional solar panels installation: What to do?

So now that you’re finally ready to officially go solar, it’s got you wondering, should you roll up your sleeves and install the panels yourself, or bring in the pros? It’s a big decision, and it’s worth thinking through carefully. DIY solar installation might sound like a great way to save money upfront, but it’s not as simple as it seems. The choice you make can affect everything from how well your system performs to how long it lasts. Plus, it can play a role in just how much energy you save in the long run.

Let’s take a closer look at what’s involved with doing it yourself:

DIY solar panel installation

Pros:

• ✅ Lower initial costs
• ✅ Personal satisfaction and learning experience
• ✅ Complete control over the project

Cons:

• ❌ Potential for mistakes due to lack of experience
• ❌ Requires good understanding of electrical systems and roofing
• ❌ Time-consuming, especially for first-time installers
• ❌ Responsibility for obtaining permits and approvals
• ❌ Warranties depend on individual parts and are often lower
• ❌ Higher risk of accidents without professional training
• ❌ Performance may vary based on quality of installation

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Professional solar panel installation

If you want your solar installation to be done right the first time (not to mention, hassle-free), then hiring a professional is the way to go. They make sure your solar system is installed correctly, runs efficiently, and meets all the necessary regulations. When it’s done by professionals, your system performs better, lasts longer, and delivers bigger savings in the long run.

Let’s take a look at why going with a professional installer might be the smartest choice:

Pros:

• ✅ Expertise reduces the risk of errors
• ✅ Certified installers bring extensive knowledge and experience
• ✅ Typically quicker and more efficient
• ✅ Installers handle the permitting process and ensure compliance
• ✅ High-quality installation with industry-standard adherence
• ✅ Comprehensive warranties and professional support
• ✅ Strict adherence to safety protocols
• ✅ Optimised performance with professional design and installation

Cons:

• ❌ Higher initial costs
• ❌ Dependence on installer professionalism and efficiency

The winner is: professional solar panel installation!

Sure, DIY installations can save on labour costs, and there’s something satisfying about tackling a big project yourself. But when we look at the big picture here, installing solar panels isn’t your average weekend job. Solar installations require a lot of expertise in structural and electrical work, and mistakes can be dangerous, costly, and might mean your system doesn’t work as it should.

Professional installers have the technical expertise to make sure everything is done safely, efficiently, and following the regulations. They also provide warranties for your system and equipment, allowing your mind to be put at ease. Plus, they’ll get the job done much faster. In fact, they can do it often in a shorter time frame, so you can start enjoying lower bills and energy savings right away.

DIY might save you a few pounds upfront, but the risks and effort usually aren’t worth it. For most people, hiring a professional is the smarter, safer, and stress-free choice.

Looking for professional solar panel installers? Indubitably, the right team makes all the difference. Our certified installers handle everything for you and in the right way. From checking to see if your roof is suitable to safely setting up your solar PV system. Leave it to us and we’ll make sure to maximise your panels’ performance, manage the paperwork, and even guide you on savings like the Smart Export Guarantee.

Choosing reliable solar panel installers: What to look out for

Finding the right solar panel installer by making sure they’re certified by the Microgeneration Certification Scheme (MCS) and TrustMark. These are your guarantees that the installer knows their stuff and follows industry standards.

A good installer should provide a clear, detailed quote that lays out costs, timelines, and exactly what work they’ll be doing. This transparency lets you know what to expect from start to finish.

It’s also smart to check what kind of warranties they offer. This is important to look into for both the products and the installation itself. These guarantees help protect your investment and give you the confidence that your solar system’s performance will continue running smoothly for years.

Furthermore, don’t skip the reviews! It’s always good practice to hear what others have to say or even ask for references about a company. In fact, this can tell you quite a lot about the quality of the work they do.

A reliable, experienced installer will take the stress out of the process and make sure your solar system runs smoothly and safely, so you can enjoy years of energy savings and lower electricity bills without a worry.

Contact our solar panel experts: Get a solar panel quote online >

Solar panel installation process overview

By now, you’ll know whether your roof is suitable for a solar panel system and understand the importance of choosing a professional panel installer. With those key decisions sorted, it’s time to look at what happens next.

10-point checklist for solar installations

Installing solar PV panels is an exciting step toward cutting energy costs and going green. With the right planning and expert installation, it’s easier than you might think.

For the process, as a whole, solar panel installations typically takes several days to complete, depending on the complexity of the system. Please keep in mind that solar panel installation requires specialised training and equipment to ensure a safe and efficient installation.

Here’s a quick 10-point checklist to show you what to expect and how it all comes together.

01. Preliminary assessment

The first step is figuring out if your home is a good fit for solar. Installers will check your roof’s orientation, shading, and available space to determine how many solar panels you’ll need and how much energy they can produce.

At Soly, we complete this step remotely. It’s easy to book a phone consultation with one of our solar experts who will use innovative satellite technology to look at your roof and assess what type of system will work best for you.

If you’re curious about the potential energy generation and how much you could take off of your energy bill, try our handy solar panel savings calculator to see how much you could save with solar power!

DID YOU KNOW… At Soly, we use advanced satellite technology to assess your roof remotely, validate with your images, and arrange on-site checks if needed—without adding costs on installation day.

02. Financial planning

Research and estimate all the solar panel costs. Explore your solar panel financing options and if you can apply for government grants and incentives. Obtain multiple quotes from reputable installers.

03. Necessary permits and approvals (if any)

Check your local regulations for permits and building code compliance. Apply for and secure any necessary permits.

DID YOU KNOW…In the UK, solar panels are “Permitted Development” and usually don’t need planning permission unless your home is listed, in a heritage site, or guidelines aren’t met.

04. Choosing a certified solar installer

Picking the right installer makes all the difference. Look for an MCS-certified professional with great reviews, full insurance, and solid warranties to back their work.

Before you commit, check the contract carefully.

It should lay out exactly what they’ll do, how much it’ll cost, and how long it’ll take. This way, there are no surprises along the way.

05. Site assessment

With Soly, we only conduct an on-sit assessment in certain circumstances or if the customer requests we do so. As mentioned above, our home assessment is done remotely.

However, if you choose to go through another installer, this is where they will visit to figure out the best spots for your solar PV panels and finalise the design. They’ll walk you through the plan. This includes where the panels will go and how everything connects. They’ll make sure your system is set up to work perfectly for your home.

06. Sourcing materials

The installer will order all the solar PV system components needed: the solar panels, solar inverters, mounting equipment, and other electrical components. Our installers will arrive at the property with the necessary materials.

Keep on reading: All Types of Solar Panels Explained

07. Preparation

Before work begins, the installer needs to make sure that the roof is able to support the solar panel system. They will inspect and reinforce the roof structure if required. They will install roof penetrations, flashings, and supports.

08. Wiring

Now it’s time to bring your solar panels to life! Your installer will connect the panels to the inverter and your home’s electrical system, making sure everything is safe and up to code. They’ll test the connections to ensure your solar energy system runs smoothly from day one.

09. Installing panels

Your installer will set up scaffolding, secure the brackets, and attach the solar PV panels to your roof. Before they begin, they’ll make sure the area is free of debris and hazards, as well as follow any proper ladder safety practices. Once everything’s in place, they’ll connect the panels and check that the solar system is working perfectly and functioning safely.

10. Documents

Before your solar panel system can be installed, Soly takes care of a very important step for you: submitting the DNO (Distribution Network Operator) application. This approval is essential before installation can even be scheduled, so you’re in good hands knowing it’s all handled.

Once your system is up and running, you’ll get a handover pack from Soly, usually within 28 days. This pack includes all the essential documents, such as the DNO commissioning certificate, which is required to sell any excess energy back to the grid.

Be sure to keep a record of your system’s setup, serial numbers, and any important documents like permits and approvals—it’ll save you hassle later.

If you’re curious about the process, have a look at our Installation Journey page.

Solar panel installation costs involved

From the panels themselves to the installation process and any additional components like a solar battery, there are several factors that can influence the total price. Here’s what to expect so you can plan confidently:

How much does it cost to install solar panels on a house UK?

Solar panel costs for a typical three-bedroom home range from £6,000 to £8,000 for a 3.5kW system. The price depends on factors like system size, solar panel efficiency, and the type of panels you choose—monocrystalline (most efficient but pricier at £1 per watt), polycrystalline (budget-friendly at roughly £0.90 per watt), or thin-film (cheapest, ranging from £0.40 to £0.80 per watt but less efficient). Inevitably, the higher the number of solar panels, means the higher the costs.

Labour costs can add £1,000 to £3,000 depending on your location and installation complexity. Extras like solar batteries (£4,325–£9,405) and mounting systems (£255–£765) can increase the investment but boost energy independence. Programmes like 0% VAT on solar panels and the Smart Export Guarantee (SEG) can help reduce costs and even earn you money back for excess solar energy.

Switching to solar is not just a financial decision—it’s a step toward energy independence. With modern panels performing efficiently even in the UK’s cloudy conditions, solar energy remains a smart investment.

Key considerations before installing solar panels

Remember, taking the time to plan for the right system can make all the difference. Let’s walk through the key things to know before getting your solar panels installed:

How many solar panels do I need to power my house?

The number of solar panels you’ll need to power your home depends on a few key things, like how much energy your household uses, how much roof space you have, and the size of the solar panel system you want to install. While every home is a bit different, we can give you a pretty good idea based on some common setups.

For a smaller household of 1-2 people with low energy use (around 1,800 kWh a year), you’ll likely need around 6 solar panels, which will take up about 12 m² of roof space. A medium-sized family of 3, with a bit more energy use (around 2,700 kWh annually), might need closer to 10 solar panels and about 20 m² of roof space for a 3.5 kWp system. If you’re a larger household of 4-5 people, using more energy (about 4,100 kWh annually), you’ll probably need around 14 solar panels, which will take up roughly 28 m² of roof space.

Of course, these are just estimates based on typical UK households and modern solar panels that produce around 435W each. Things like where you live, how much sunlight your roof gets, and even the efficiency of the panels you choose can make a difference. The best way to know exactly how many panels you’ll need? Get a professional assessment tailored to your home’s unique needs.

What affects how many solar panels you’ll need?

Here’s an easy-to-follow look at the main things that affect how many solar panels you’ll need, how they make a difference, and why they’re important.

What is the right solar system size for your panels?

Figuring out the right solar panel sizes & dimensions for your home comes down to a few key things: how many solar panels you’ll need, how much energy they can produce (rated capacity), and how well they fit on your roof. Your system needs to be big enough to cover your energy needs while cutting down your reliance on the grid. To get the best results, the panels should also be installed at the right angle to soak up as much sunlight as possible and stand up to the UK’s weather.

Let’s keep it simple. Most residential solar panels in the UK produce between 250W and 450W, measure around 1.7m x 1m, and weigh about 18-21 kg. For an average three-bedroom home, a 3.5kWp system usually does the trick. That’s about 10 panels, taking up roughly 20m² of roof space.

If your household uses more energy, you might need a bigger system—something like 5kWp with 14 panels, which would need up to 28m² of space.

Got a smaller roof?
No problem.

High-efficiency monocrystalline panels can pack more power into less space, making them perfect for tighter setups.

For businesses or larger properties, the game changes. Commercial panels are bigger and more powerful, delivering up to 600W each. They’re perfect for meeting higher energy demands but might need a bit more prep work to make sure your roof can handle their size and weight.

In the end, getting the right solar system size is all about finding a balance. It’s not just about how much space you have but also what works for your energy goals and budget.

Solar panel delivery time: How long does it take to install solar panels?

A lot of people wonder, “how long does the installation of solar panels take?” The answer might surprise you—it’s actually pretty quick! For most homes with up to 20 solar panels, the entire installation can usually be done in just one working day. If you’re installing a bigger system with more panels, it might take a little longer to make sure everything is installed properly and safely, but the process is still straightforward.

Here’s how it works: outside, the installation team will set up scaffolding (if needed) and secure the mounting brackets to your roof. Then they’ll install the solar panels and connect the wiring that links them to the inverter. Inside, the inverter is usually installed in your attic or a technical space, and cables are run between the panels, the inverter, and your metre box. If you’ve opted for a monitoring system or adjustments to your metre box, those are set up at this stage too.

At Soly, we take care of all the planning and prep, so the process feels seamless from start to finish. Our certified installers stick to the latest standards and make sure you know what’s happening every step of the way. Once your solar panels are up and running, we’ll send you a handover pack (usually within 28 days) that includes everything you need. You’ll have your DNO commissioning certificate, so you can register for net-metering or feed-in compensation schemes. From the moment you request a free quote, we aim to have your system installed and ready to go within four weeks.

Where is the best place to install solar panels?

When it comes to solar panels, the best spot is usually right on your roof. Rooftop installations are the most common choice because they make the most of the available sunlight, helping you produce more energy and save money in the long run. If your roof faces south, even better—that’s the sweet spot for soaking up the most sunlight throughout the day. But don’t worry if your roof faces east or west; those directions can still generate plenty of energy. The only one to avoid? A north-facing roof, as it just doesn’t get enough direct sunlight to make solar worthwhile.

If your roof isn’t an option, you’ve still got some great alternatives.

Ground-mounted solar panels are perfect if you have an open garden or outdoor space. They’re super flexible because you can adjust their angle to capture the most sunlight, but you’ll need to watch out for shading from trees or nearby structures.

Shed or garage rooftops are another option, as long as the roof is sturdy and gets good sun exposure. These can be a great way to add extra capacity if your main roof is already packed or isn’t big enough.

Want to go all-in on sustainability?

Consider a biosolar roof. This innovative option combines a green roof with solar panels to give you the best of both worlds. Think plants and vegetation among solar panels. Not only do you get renewable energy, but the green roof provides insulation, supports local wildlife, and helps improve air quality. Plus, the plants can actually keep the panels cooler, which helps them work more efficiently. It’s a win-win for energy savings and the environment.

While ground-mounted systems and shed rooftops are solid alternatives, rooftop solar panels are still the most practical and cost-effective choice for most UK homes. Wherever you decide to install them, you’ll be taking a big step toward lowering your energy bills and making your home more sustainable.

Type of solar panels installed: What to choose

Choosing the right solar panels for your home all comes down to your roof size, budget, and energy needs. Here’s a simple breakdown of the three main types of solar panels: monocrystalline, polycrystalline, and thin-film.

This way, you can decide what works best for you.

Monocrystalline panels
These are the best of the best when it comes to efficiency. Made from a single crystal of silicon, they convert more than 20% of sunlight into electricity, which means they generate a lot of energy even with fewer panels. If you have a smaller roof or want to get the most power out of your system, monocrystalline panels are perfect. They’re durable, sleek, and handle cloudy UK weather like a champ, making them ideal for long-term savings.

Polycrystalline panels
If you’ve got a bit more roof space and are looking to keep costs down, polycrystalline panels are a great option. They’re made from multiple silicon crystals, so they’re slightly less efficient (14-16%) but also more affordable. You’ll need more of them to generate the same amount of power as monocrystalline panels, but for homes with larger roofs, this trade-off can work well.

Thin-film panels
Thin-film panels are lightweight, flexible, and usually the cheapest to install. While their efficiency is lower (7-13%) and they don’t last as long as the other types, they’re perfect for unique situations. If you have a curved roof or a project that needs lightweight, adaptable panels, thin-film might be your best bet.
What’s the best option for you?

• Small roofs: Go with monocrystalline panels—they pack the most power into the least amount of space.
• Big roofs on a budget: Polycrystalline panels are a smart choice if you have the room for more panels and want to save on upfront costs.
• Special situations: Thin-film panels work well for unconventional setups, but they’re less common for everyday residential use.

If you’re still unsure, don’t worry! Chatting with one of our friendly solar experts can help you figure out what’s best for your home and energy needs. The right choice depends on your priorities, but no matter which type you pick, you’ll be one step closer to clean, renewable energy.

Do you need to maintain your solar panels?

Solar panels can handle pretty much anything the UK weather can throw at them, from heavy rain to strong winds, with very little upkeep. That said, giving them a bit of love now and then can help them work at their best and last for decades.

Most of the time, nature takes care of cleaning your solar panels—rain does a great job of washing away dirt and debris. But if you live in an area where bird droppings, dust, or leaves tend to pile up. Even then, you can add bird blocker to panels in order to avoid bird droppings. However, when it comes to dust accumulation or leaves, giving your panels a quick clean once a year can make a big difference in keeping your energy production high.

At Soly, we’ve made it even simpler.

Our panels are designed to require minimal maintenance, so most of the time, you won’t need to do a thing. For peace of mind, an annual check-up is a good idea. It can catch small issues like overgrown trees causing shading or anything else that might affect performance. Plus, with our handy Soly app, you can keep an eye on your system’s output and get alerts if something needs attention.

With just a little care, your solar panels can keep delivering clean, renewable energy for up to 30 years or more. And with our easy-to-maintain systems and expert support, you can sit back and enjoy all the benefits of solar power with hardly any effort!

FAQs

Can I install solar panels myself?

In theory, yes—but it’s not a good idea. Installing solar panels isn’t as simple as popping them on your roof and plugging them in. It’s a tricky process that involves specialised equipment, electrical know-how, and proper safety precautions. Without the right training, it can be dangerous, and even if you manage to get the panels up, they might not work efficiently or safely.

That’s why it’s always best to leave it to the pros. A professional installer knows exactly how to set up your system to make sure it’s safe, efficient, and built to last. Plus, they’ll take care of all the technical stuff, so you can sit back and enjoy the energy savings without any hassle. Sometimes, it’s just better to let the experts handle it!

Does the UK government give grants for solar panels?

Yes, there are a few ways the UK government helps make solar panels more affordable:

• Energy Company Obligation (ECO4): If you’re on a low income, you might qualify for funding to install solar panels as part of this energy-saving scheme.
• 0% VAT on Solar Panels: Solar installations are VAT-free, which means you’ll save money on the overall cost.
• Smart Export Guarantee (SEG): This lets you earn money by selling any extra electricity your solar panels produce back to the grid.
• Home Upgrade Grant (HUG): For low-income households off the gas grid, this grant can help cover the cost of solar panels and other energy-efficient improvements.

Each scheme has different requirements, so it’s worth checking with a solar expert or visiting the official government websites to see what you’re eligible for.

Do I need to tell my electricity supplier I have solar panels?

Yes, you do! Letting your electricity supplier know you’ve installed solar panels is important to make sure everything is set up correctly. It also means you can sign up for the Smart Export Guarantee (SEG), which lets you earn money for any extra electricity your panels generate and send back to the grid.

You’ll also need to tell your Distribution Network Operator (DNO)—they’re the ones who look after the local electricity network. Don’t worry, though—your solar installer usually handles this for you. Just double-check to make sure it’s been done. Keeping everyone in the loop makes sure your system runs smoothly and safely.

The bottom line: Install solar panels or not?

If you’re wondering whether solar panels are worth it, the answer is usually a big yes. They can save you a lot on energy bills, reduce your carbon footprint, and even add value to your home. Plus, there’s something satisfying about generating your own electricity and being less dependent on the grid (especially with energy prices on the rise).

When installed by a professional, solar panels are reliable, long-lasting, and a great way to switch to renewable energy. They’ll keep your home powered for years while helping the planet at the same time.

Still on the fence?

Take a look at our guides on the pros and cons of solar panels and are solar panels worth it to see if they’re the right fit for you.

Why choose Soly for your solar panel needs?

At Soly, we make solar energy accessible and ensure your photovoltaic system lasts as long as possible, performing at its best. Here’s why we’re the ideal choice for your solar energy journey:

• Affordable financing: We understand that upfront costs can be a barrier to going solar. That’s why we offer convenient financing options, including a £500 deposit plan, where the remaining balance is due only after your system is installed and operational. This makes solar energy more affordable for UK residents. Soly also partners with Ideal4Finance, providing tailored, competitive financing with instant, personalised offers.
• Referral benefits: Soly offers the best referral scheme in the solar market. As a Soly customer, you can earn £300 for each friend you refer who installs a system with Soly—with no limits! This can significantly help reduce your payback period. For example, one of our customers, Martyn, managed to reduce his payback period by nearly a year by referring just three friends.
• High-quality panels: We use only the best solar panels, offering monocrystalline solar panels from Jinko Solar. Known for their efficiency and durability, these monocrystalline solar panels can last for up to 40 years, ensuring you get the most out of your investment.
• Trusted reputation: Soly is proud to be highly rated on platforms like TrustPilot and Google and recognized as a certified Which? Trusted Trader. We’ve built a reputation for excellence, earning the trust of countless satisfied customers, with our commitment to quality evident in every installation.
• Accredited installers: We work exclusively with local installers nationwide who are accredited by HIES, TrustMark, and MCS, ensuring that your solar system is installed with the highest industry standards in mind. Proper installation plays a huge role in maximising the lifespan of your solar panels.
• Expertise you can trust: With over 10 years of experience in the solar industry, we know how to deliver the best solar solutions tailored to your needs. Our team of experts will ensure your system is designed to last.
• Peace of mind: We provide up to 25-year guarantees for our solar panels and 15-year guarantees for our solar batteries. This means you can have peace of mind knowing your investment is protected for decades to come.

Reach out to our solar experts today to discover how Soly can help you transition to clean, renewable energy with the best products and financing options.