Windsor is one of the best locations in the UK for solar energy. The town enjoys approximately 1,675 hours of sunshine per year – significantly above the UK average of around 1,400 hours – and its southern England position means solar panels here deliver a strong return on investment. If you are thinking about installing solar panels on your home or business in Windsor, you are in the right place.
At Infinity Energy Services, we have been designing and installing high-performance solar PV systems for homes and businesses since 2011. We are not a sales company. We are technical experts with over 6,500 installations behind us, a reputation built on quality, care, and long-term support, and a track record recognised by the industry – we won Best Regional Installer at the Energy Efficiency Awards in both 2023 and 2024.
This page explains everything you need to know about going solar in Windsor – from costs, savings, and return on investment to planning permission and the installation process. Windsor is a town with a rich heritage and some unique planning considerations, so we cover those in detail. Whether you are a homeowner looking to cut your electricity bills or a business wanting to reduce overheads, we are here to help.
– Last updated 22 March 2026 –
Infinity Energy Services is a safe pair of hands for your solar panel installation in Windsor:
- Installing energy systems since 2011
- Over 6,500 installations completed
- Award-winning: Energy Efficiency Awards 2023 & 2024
- Finance available
- Free, no-obligation quote
Call 0800 909 8882
with any questions or for expert advice
Certified, Accredited & Award winning service
Why Windsor Is an Excellent Location
for Solar Panels
Windsor enjoys some of the highest sunshine levels in the UK. Long-term climate data for the Windsor area records approximately 1,675 hours of bright sunshine per year, around 20% above the national average of roughly 1,400 hours.
July is typically the sunniest month, averaging approximately 219 hours of sunshine.
But solar panels do not need blazing sunshine to work. They generate electricity from daylight (irradiance), so they produce meaningful output even on overcast days.
With Windsor’s southern England location and above-average sunshine, solar panels here deliver a strong return on investment and a faster route to energy independence than in many other parts of the country.
Peak solar production in Windsor runs from April to September, aligning well with longer daylight hours and warmer temperatures. Combined with a well-designed battery storage system, this means you can generate, store, and use your own electricity for a significant portion of the year – dramatically reducing what you pay to the grid.
Windsor Castle – A Renewable Energy Pioneer on Your Doorstep
Windsor is home to one of the most famous buildings in the world, and one that has been investing in renewable energy for decades. Windsor Castle has used Combined Heat and Power to provide heating and hot water since 1994-95, converting natural gas into electricity with the waste heat captured and reused.
In 2013, the Castle went further. A hydroelectric power scheme at Romney Weir on the River Thames became operational, using two Archimedes screw turbines to generate electricity from the flow of the river. The scheme delivers approximately 320 kW at peak flow and meets around 40% of Windsor Castle’s electricity requirements; a remarkable achievement for a 900-year-old building.
The Royal Household has also invested in smart metering across the estate, energy-efficient LED lighting, and a network of Green Champions working since 2006-07 to reduce energy consumption and environmental impact.
If the UK’s most famous castle has invested in renewable energy, your home can benefit too. Solar panels on a typical Windsor home will generate free electricity from daylight for 25 years or more – cutting your bills, reducing your carbon footprint, and delivering a strong return on your investment.
RBWM’s Climate Emergency and What It Means for Homeowners
The Royal Borough of Windsor and Maidenhead (RBWM) declared a climate and environment emergency in June 2019, committing to achieving net zero carbon emissions across the borough by 2050 at the latest and addressing the biodiversity crisis. The council’s Environment and Climate Strategy, adopted in December 2020, sets out a five-year approach across four key themes: Circular Economy, Energy, Natural Environment, and Transport.
The strategy set a trajectory seeking a 50% reduction in borough-wide emissions by 2025. While that target has not been fully met – no council in the country has achieved its most ambitious targets – RBWM has reduced carbon emissions more than any other borough in Berkshire, according to a council cabinet member speaking in 2025. A new Environment and Climate Strategy for 2026-2035 is now being developed, with input from the Climate Partnership and community groups.
Local community action is strong. The RBWM Climate Emergency Coalition, a non-partisan group formed in 2019, holds the council to account on its climate commitments. The Eco Action Hub in Windsor’s Nicholsons Centre serves as a community resource for residents looking to live more sustainably. Eco Action for Windsor and Maidenhead now has 28 eco partners working to help and inspire residents to take action.
For homeowners, installing solar panels is one of the most impactful steps you can take to support RBWM’s climate goals while also saving money on your electricity bills. Every kilowatt of solar energy your home generates is one less kilowatt drawn from the grid, and one less kilowatt produced from fossil fuels.
How Much Do Solar Panels Cost in Windsor?
The cost of solar panels depends on several factors, including the system size, your roof’s orientation and condition, the panels and inverter chosen, and whether you include battery storage.
Every property is different, which is why we always recommend a free, no-obligation quote tailored to your specific home and energy usage.
However, to give you a general idea: in 2026, a typical 4 kW residential solar PV system – suitable for most three- or four-bedroom homes – costs approximately £5,500 to £8,000 fully installed. Adding a 5 kWh battery takes the total to approximately £9,000 to £12,000.
Importantly, there is currently 0% VAT on residential solar panel and battery storage installations in the UK. This has been in place since 2022 and has been extended to at least 31 March 2027. This alone saves homeowners a significant amount compared to the standard 20% VAT rate.
We offer flexible finance options, allowing you to spread the cost with affordable monthly payments. Subject to status.
Solar Panel ROI – Why Solar Beats a Savings Account
If you are weighing up whether to invest in solar panels, consider this: how does the return compare with simply putting the same money in a bank?
As of early 2026, the best easy-access savings accounts in the UK pay around 4-4.5%, with many high-street banks offering just 2-3%. Put £9,000 into a top-paying account at 4.5% and you would earn roughly £405 in interest over the first year – before tax, and before inflation erodes the real value of your money. With the Bank of England base rate at 3.75% and further cuts possible, savings rates are likely to fall further still.
Now consider investing that same £9,000 in a solar panel and battery storage system for your Windsor home. Based on a south-facing 4.95 kWp installation paired with a 10 kWh battery, a typical household here could expect bill savings of around £1,070 in the first year, plus approximately £144 in Smart Export Guarantee payments for surplus energy sold back to the grid. That is a total first-year gain of roughly £1,214 – an effective return on investment of 13.5%, or around three times the best savings rate on the market.
Unlike bank interest, solar savings are completely tax-free – there is no personal savings allowance to worry about. And while savings rates are expected to fall, your solar returns are underpinned by the electricity you no longer need to buy from the grid. That 13.5% ROI translates into an 88% reduction in household electricity costs from day one, largely because the battery stores surplus daytime generation for evening use – lifting self-consumption from around 35% to over 75%. For Windsor homeowners planning to stay in their property, the financial case is clear: solar and battery storage comfortably outperforms any savings product currently available in the UK.
Grants and Financial Incentives for Solar Panels in Windsor
Several financial incentives are available to Windsor homeowners considering solar panels:
- 0% VAT – residential solar panel and battery storage installations are zero-rated for VAT until at least 31 March 2027. This saves approximately 20% compared to the standard rate.
- Smart Export Guarantee (SEG) – all large energy suppliers are required to offer export tariffs, paying you for surplus electricity you send back to the grid. Your installation must be MCS-certified to be eligible – which all Infinity installations are.
- ECO4 scheme – if you are on a low income or live in an energy-inefficient property (EPC rating E, F, or G), you may be eligible for fully or partly funded solar through the Energy Company Obligation scheme.
- Finance options – we offer affordable finance to spread the cost of your installation. Subject to status.
The Centre for Sustainable Energy also provides free, impartial advice to Berkshire residents on reducing energy bills and accessing available grants. Locally, Eco Action for Windsor and Maidenhead is a community resource in the Nicholsons Centre that supports residents with sustainability initiatives, including guidance on renewable energy options.
The Benefits of Solar Panels in Windsor
Solar panels generate free electricity from daylight. They produce no carbon emissions, require minimal maintenance, and last for decades. Here are the key benefits of installing solar panels on your Windsor home:
- Save on electricity bills from day one – generate your own free power and reduce what you buy from the grid.
- 0% VAT – the UK government has cut VAT on residential solar panels and battery storage installations to zero.
- Earn money via the Smart Export Guarantee (SEG) – get paid for surplus electricity you export back to the grid.
- 25-40 year solar panel warranties – the panels we install are built to last, with long-term manufacturer guarantees.
- Increase your home’s value – research from Solar Energy UK confirms that solar is seen as a desirable property upgrade.
- Reduce your carbon footprint – a typical 4 kWp system saves approximately one tonne of CO2 per year.
- Finance available – pay upfront or spread the cost with affordable monthly payments.
Call 0800 909 8882
Add Battery Storage to Make Even Greater Savings
Most solar panel systems generate surplus electricity during the day – particularly during spring and summer – that would otherwise be exported to the grid. While you do get paid for that electricity via the Smart Export Guarantee, you make far greater savings by using it yourself.
That is where battery storage comes in. A solar battery captures your excess solar energy and stores it for use later in the day – for example, in the evenings or at night – instead of pulling expensive electricity from the grid.
You can also install battery storage without solar panels. This allows you to charge your battery with cheap, off-peak electricity overnight and discharge it during expensive peak hours, reducing your bills significantly.
We install all makes and models in Windsor, including Tesla Powerwall 3, Sigenergy SigenStor, Fox, SolarEdge, GivEnergy, SolaX, Enphase, Pylontech and more.
Call 0800 909 8882
Battery storage allows you to:
- Store and use more of your solar electricity
- Save even more money every month
- Import less electricity from the grid
- Have emergency backup power in a power cut (certain models)
- Store cheap, off-peak electricity at night and use it during the day
- Become much more energy independent, especially in summer
Planning Permission for Solar Panels in Windsor
In most cases, solar panels are permitted development and do not require planning permission. This applies to the vast majority of residential properties in Windsor.
Under permitted development rules, solar panels can be installed on your roof provided they do not protrude more than 200 mm from the roof surface, do not exceed the highest part of the roof (excluding the chimney), and are not installed on a wall facing a highway in a conservation area.
However, Windsor is a town with an exceptionally rich heritage – home to Windsor Castle, multiple conservation areas, and a high density of listed buildings. There are some important exceptions that Windsor homeowners should be aware of:
Conservation Areas in Windsor
The Royal Borough of Windsor and Maidenhead has 27 designated conservation areas across the borough. Several of these directly affect Windsor, including Inner Windsor, Windsor Town Centre, Old Windsor, Mill Lane (Clewer Village), and Trinity Place/Clarence Crescent. If your property is in a conservation area, there are additional considerations, but solar is still very much possible.
In December 2023, the government amended permitted development rights to allow solar panels on roof slopes facing a highway in conservation areas and designated landscapes. This was an important change. It means that roof-mounted solar installations are generally permitted in conservation areas, provided they comply with the standard conditions. However, solar panels cannot be installed on a wall facing a highway in a conservation area without planning permission.
The setting of Windsor Castle is a particularly sensitive heritage area. If your property is in close proximity to the Castle, additional care may be needed to ensure the installation is sympathetic to its surroundings. We will advise on this during our initial survey.
Listed Buildings in Windsor
The Royal Borough of Windsor and Maidenhead has 956 listed buildings, including Windsor Castle itself, which is a Grade I listed building, placing it in the top 2.5% of all listed buildings nationally. Windsor Castle is both the largest inhabited castle in the world and the longest-occupied royal palace in Europe, so its setting carries particular weight in planning decisions.
If your property is a listed building, you will almost certainly need Listed Building Consent before installing solar panels. The installation must be reversible and must not alter the building’s character or appearance. We would recommend speaking to RBWM’s planning department for specific advice on your property.
We will assess your specific property and advise on any planning considerations during our initial survey. Windsor’s heritage density means planning considerations are more common here than in many other towns, but it does not mean solar is off the table. For detailed guidance, see our comprehensive guide: Do You Need Planning Permission for Solar Panels?
Commercial Solar Panel Installation in Windsor
Solar panels are not just for homes. We deliver commercial solar projects for businesses, farms, schools, and public sector organisations across Windsor and Berkshire.
Windsor is one of the UK’s premier tourism destinations, attracting approximately 12.73 million trips per year and generating £585 million in visitor expenditure. The town’s economy supports over 11,400 jobs linked to tourism alone, with Windsor Castle, LEGOLAND Windsor Resort, Eton College, and the Royal Borough’s thriving retail and hospitality sector all contributing to a vibrant commercial landscape.
Sustainability is increasingly important to Windsor’s commercial sector. LEGOLAND Windsor Resort’s new Woodland Village accommodation was designed to be operationally carbon-neutral – the first such development by its parent company Merlin Entertainments globally. With electricity costs continuing to rise, businesses across Windsor are turning to solar to cut overheads, meet sustainability targets, and future-proof their energy supply.
RBWM’s climate emergency declaration – with its 2050 net zero target – is also driving increased interest from commercial landlords and organisations wanting to demonstrate their environmental credentials.
Key benefits for Windsor businesses:
- Dramatically reduce electricity overheads – a well-designed commercial system can cut electricity costs by 50% or more.
- Capital allowances – use the Annual Investment Allowance to offset the cost of your solar installation against taxable profits.
- VAT – commercial installations are subject to 20% VAT, but this is fully reclaimable for VAT-registered businesses.
- Meet sustainability targets and enhance your corporate environmental credentials.
For full details, see our Commercial Solar ROI & Payback guide.
Why choose Infinity Energy Services?
Once you’ve spoken to us to discuss your project, we are confident you’ll like what you hear, but in the meantime here are some reasons why you’re safe with us:
- Expertise – We have been designing and installing solar and battery systems since 2011. We understand the technology inside out.
- Awards – Our excellent standards are recognised by the industry: we won Best Regional Installer in 2023 and 2024 at the prestigious Energy Efficiency Awards.
- Experience – Over 6,500 installations completed to date. Small, medium, and large systems for homes and businesses. We have done it all.
- Finance – Spread the cost with affordable, flexible payment options. Subject to status.
- Infinity Certified Installers – We vet and certify all our installation engineers to guarantee top quality, every time.
- Top Brands – Major manufacturers have certified us at the highest level: Tesla Powerwall Premium Installer and SunPower Elite Partner.
- Accreditations – We hold a long list of relevant accreditations, including MCS, RECC, NICEIC, NAPIT, CHAS, and TrustMark.
- Insurance – £10 million Employers Liability and £5 million Public Liability cover.
SERVICE THAT’S FULLY SUPPORTED, ACCREDITED AND GUARANTEED
Our Accreditations and Why They Matter
When choosing a solar installer, accreditations are one of the most important things to check. Here is what ours mean for you:
- MCS (Microgeneration Certification Scheme) – the industry standard for renewable energy installations in the UK. MCS certification is a legal requirement for your installation to be eligible for the Smart Export Guarantee, so you can get paid for the electricity you export. It also confirms that the installer meets rigorous quality, competence, and consumer protection standards.
- RECC (Renewable Energy Consumer Code) – a consumer protection scheme specifically for the renewable energy sector. RECC membership means we adhere to a strict code of conduct covering sales, installation, and aftercare, and that you have access to an independent alternative dispute resolution service if anything goes wrong.
- NICEIC – one of the UK’s leading certification bodies for electrical contractors. NICEIC registration confirms that our electrical work meets the highest safety and competence standards.
- NAPIT – a government-approved certification body. NAPIT membership confirms compliance with Building Regulations for electrical installations.
- TrustMark – a government-endorsed quality scheme. TrustMark registration gives you access to financial protections, including insurance-backed guarantees on the work we carry out.
- CHAS (Contractors Health and Safety Assessment Scheme) – confirms that we meet rigorous health and safety standards on every project.
Call 0800 909 8882
Video Feedback
We love our customers, and our customers love us.
Find out what they really think – straight from the horse’s mouth:
WATCH THE VIDEO
HOW OUR TEAM DELIVERED A SOLAR PV SYSTEM
Our Solar Panel Installation Process
You discuss your project with one of our energy experts. We look at suitable roofs, any shading, equipment recommendations, ballpark costs, and anything else you want to achieve.
After the discovery call, we either send you a tailored proposal straightaway or visit your property if the layout is more complex. We always carry out an on-site technical survey before installation, to ensure there are no surprises. For Windsor properties in conservation areas – such as those in Inner Windsor, the town centre, or near the Castle – we will advise on any planning considerations at this stage.
If you decide to go ahead, you will receive a first-class solar installation from our certified team of engineers. No corners cut. Best practice applied for every customer. Most residential solar panel installations are completed in just 1-2 days.
We are not the kind of solar installer that takes your money and then never answers the phone again. We are here for the long term. We provide the same high levels of support before, during, and after installation – backed by an insurance-backed workmanship guarantee.
What Our Customers Say
Areas We Cover in Windsor and Berkshire
We install solar and battery systems across Windsor and the wider Berkshire area, including all of the following locations:
- Windsor town centre
- Clewer Village
- Clewer Green
- Dedworth
- Old Windsor
- Datchet
- Ascot
- Sunningdale
- Sunninghill
- Winkfield
- Cranbourne
- Fifield
- Oakley Green
- Holyport
- Bray
- White Waltham
We also cover the whole of Berkshire. See our Expert Solar Panel Installers in Berkshire hub page for countywide coverage.
Frequently Asked Questions
How much do solar panels cost in Windsor?
The cost depends on several factors, including the system size, your roof’s orientation and condition, the panels and inverter chosen, and whether you include battery storage. As a general guide, a typical 4 kW system for a three- or four-bedroom house costs approximately £5,500 to £8,000 fully installed in 2026. Adding a 5 kWh battery takes the total to approximately £9,000 to £12,000. Residential installations currently benefit from 0% VAT. Every property is different, so contact us for a free, no-obligation quote tailored to your specific home.
Do I need planning permission for solar panels in Windsor?
In most cases, no. Solar panels are typically permitted development and do not require planning permission. However, Windsor has a particularly high density of heritage assets. If your property is a listed building, you will almost certainly need Listed Building Consent. The Royal Borough of Windsor and Maidenhead has 956 listed buildings, including Windsor Castle itself. If you are in one of Windsor’s conservation areas – such as Inner Windsor, the town centre, or Old Windsor – solar panels on roof slopes are generally permitted following a December 2023 amendment to permitted development rights, but panels on a wall facing a highway still require permission. We will advise you on all of this during our initial survey.
How many solar panels do I need for a 3-bedroom house?
A typical three-bedroom house in Windsor would need approximately 8-12 solar panels, depending on the panel wattage, your roof space, and your electricity consumption. This usually equates to a system size of around 3.5 to 4.5 kW. We design every system individually based on your property and usage, so the exact number will be confirmed during our survey and system design process.
Are solar panels worth it in Windsor?
Yes. Windsor’s sunshine levels, the current 0% VAT on residential installations, and high electricity prices mean solar panels can deliver strong returns for most homeowners. As of early 2026, top easy-access savings accounts pay around 4-4.5%, but a typical Windsor solar-and-battery system can generate an effective return of about 13.5% in year one – roughly three times as much – through bill savings and Smart Export Guarantee payments. Unlike bank interest, those savings are tax-free, and your returns are underpinned by electricity you no longer need to buy from the grid. After the system effectively pays for itself, you continue to benefit from free or heavily reduced electricity for the remaining life of the panels, typically 25 years or more.
Can I get a grant for solar panels in Windsor?
There is currently no blanket government grant for solar panels, but several financial incentives are available. Residential installations benefit from 0% VAT until at least 31 March 2027. The Smart Export Guarantee pays you for surplus electricity you export to the grid. If you are on a low income or live in an energy-inefficient property, you may be eligible for support through the ECO4 scheme. We also offer flexible finance options to help spread the cost.
How long do solar panels last?
Modern solar panels are built to last 25 to 30 years or more. Most manufacturers offer performance warranties of 25 to 40 years, guaranteeing that the panels will still produce at least 80-90% of their original rated output at the end of the warranty period. With proper care, solar panels can continue generating electricity well beyond their warranty period.
Do solar panels work on cloudy days?
Yes. Solar panels generate electricity from daylight (irradiance), not just direct sunshine. While output is highest on bright, sunny days, they still produce meaningful energy on overcast days. Windsor’s above-average sunshine hours mean your system will generate more electricity over the year than systems in many other parts of the UK.
What is battery storage and do I need it?
Battery storage allows you to store surplus solar electricity generated during the day and use it in the evenings or at night, rather than exporting it to the grid and buying more expensive electricity back later. Adding a battery significantly increases the proportion of solar electricity you use yourself – typically from around 30-50% without a battery to 70-90% with one. You can also charge a battery from the grid using cheap overnight tariffs, even without solar panels. Whether you need a battery depends on your usage patterns, but for most homeowners it is a worthwhile addition that substantially improves the overall return on your solar investment.
What accreditations should a solar installer have?
At a minimum, your solar installer should be MCS-certified. MCS (Microgeneration Certification Scheme) certification is the industry standard in the UK and is a legal requirement for your installation to be eligible for Smart Export Guarantee payments. Look also for RECC membership (consumer protection), NICEIC or NAPIT certification (electrical safety and competence), and TrustMark registration (government-endorsed quality scheme with financial protections). Infinity Energy Services holds all of these accreditations, plus CHAS for health and safety.
How long does solar panel installation take?
Most residential solar panel installations are completed in just 1-2 days. If battery storage is included, this may extend slightly. Commercial installations take longer, typically from a few days to several weeks, depending on the size and complexity of the system. We will confirm the expected timeline during the survey and system design stage.
Can I install solar panels near Windsor Castle or in a conservation area?
Yes, in most cases. Solar panels on roof slopes are generally permitted in conservation areas following a December 2023 change to permitted development rights, provided they comply with the standard conditions (no more than 200 mm protrusion from the roof surface, not exceeding the highest point of the roof). However, panels on a wall facing a highway in a conservation area still require planning permission. If your property is a listed building, you will need Listed Building Consent. The setting of Windsor Castle is a particularly sensitive heritage area, so if your property is in close proximity, we recommend seeking advice from RBWM’s planning department. We will advise on all of this during our initial survey.
Start Your Solar Journey in Windsor Today
Windsor is one of the sunniest towns in the UK, with a local council committed to net zero by 2050 and a growing number of homeowners and businesses choosing to invest in solar. Even Windsor Castle generates its own renewable energy. With 0% VAT on residential installations, rising electricity prices, and annual returns that comfortably outperform a savings account, there has never been a better time to go solar.
Infinity Energy Services is your trusted, MCS-certified, and experienced choice for a complete solar energy system in Windsor. Stop paying for electricity you can generate for free. Cut your bills, gain energy independence, and invest in a greener future for your family.
Ready to get started? Contact our team today for a free, no-obligation survey and proposal.
Call us on 0800 909 8882 or fill in your details below:
Back-to-back Solar PV Award Winners
GET YOUR FREE QUOTATION NOW:
Don’t Miss Out!
Join 6,500+ homeowners, all saving on their electricity bills with solar panels and Infinity Energy Services.
Call 0800 909 8882