In the UK, the best time to install solar panels is between February and April. This period offers the perfect balance of installer availability, favourable pricing, and ensures your system is ready to take full advantage of the longer, sunnier days from spring into summer.
Late winter and early spring are often quieter for solar installers, meaning faster scheduling and more competitive quotes. Plus, by installing before the peak generation season (typically May to August), you’ll be in the best position to maximise your solar output and reduce your energy bills as soon as the brighter weather arrives.
Although solar panels can technically be installed at any time of year, installing between February and April sets you up for the strongest performance across the UK’s most productive solar months.
What Time of Year Is Best for Installing Solar Panels in the UK?
If you’re looking to get the most out of your solar panel investment, February to April is the ideal time to install in the UK. Here’s why:
- Greater Installer Availability: Winter and early spring are typically quieter periods for installation companies, meaning less waiting time and more flexible scheduling.
- More Competitive Pricing: With demand lower outside the summer rush, you may benefit from off-peak rates or seasonal discounts.
- Ready for Peak Solar Generation: Solar energy output in the UK rises significantly from late spring through summer. Installing early means your system is operational and generating before peak sunlight begins, optimising your return from day one.
Winter (Dec–Feb)
- Less demand = more flexibility and possible discounts
- Shorter daylight, but the installation is still effective
Spring (Mar–May)
- Beat the summer rush
- Maximise solar energy gains right after installation
Summer (Jun–Aug)
- Best generation, but busiest time for installers
Autumn (Sep–Nov)
- Moderate weather, potential for post-summer installation deals
Does the Cost of Solar Panel Installation Change Throughout the Year?
Yes, the cost of installing solar panels in the UK can vary seasonally. Winter and late autumn often bring discounts and promotions, while summer tends to be more expensive due to higher demand and occasional supply shortages.
- Winter: Lower costs, more promotions
- Summer: High demand = higher prices, potential delays
- Brexit & shipping: Timing installations around these issues can affect overall project costs
Planning your installation during a low-demand period could save you hundreds. Future Heat is MCS certified and trusted across Tyne & Wear, Newcastle, and the North East. Request your free solar panel installation quote today and take the next step toward long-term energy savings.
When Is the Best Time from a Financial Perspective?
From a financial standpoint, the best time to install solar panels is before seasonal energy price hikes and ahead of grant or scheme deadlines like SEG or ECO4. Installing early also means you start generating energy savings sooner.
- Take advantage of the Smart Export Guarantee (SEG)
- Use ECO4 if eligible
- Install before winter to reduce heating costs
- Avoid price hikes from material or labour shortages
Should Weather and Climate Influence Your Installation Timing?
The weather should be considered, but it isn’t a major obstacle. Thanks to modern installation methods, solar panels can be safely and effectively installed in most UK weather conditions, including in winter.
- Installations are weather-resistant
- Minor delays are possible during storms or snow
How Much Energy Do UK Panels Produce in Each Season?
Solar panels produce energy year-round in the UK, and depending on your system size and efficiency, you may be surprised at what appliances your solar panels can realistically power, even in lower-output months. While output is highest in summer, even in winter, they generate electricity, especially with efficient modern systems.
- Winter: ~20% of annual output
- Summer: ~50%
- Regional variation: South England > Scotland
Are There Any Practical or Logistical Reasons to Delay Installation?
Yes, but they are specific to your property. If your roof needs repairs, or you require planning permission or DNO approval, these factors can delay or influence the timing of your installation.
- Assess your roof’s condition
- Bundle with roof work if needed
- Check local permissions and DNO timelines
When Is the Best Time to Install Battery Storage with Solar Panels?
The best time to install battery storage is at the same time as your solar panels if your budget allows. This optimises energy efficiency and minimises installation costs, but batteries can also be added later if needed.
- Simultaneous: Lower cost, better performance
- Staged: More financially manageable
- Great for storing summer energy for winter use
If you’re considering battery storage, it helps to understand the system requirements, including how much solar input you’d need for charging a 100Ah battery with solar panels efficiently.
What’s the Installer Availability Like Across the Year?
Installer availability is best during late autumn through early spring. Summer months are busiest, so booking well in advance is recommended if you want a summer installation.
- Winter: Shorter lead times, better availability
- Summer: High demand, limited slots
- Early booking = more options and better prices
How Can You Decide the Best Time For You?
The best time for you to install solar panels depends on your energy usage patterns, property readiness, and personal timeline. Consider your goals, saving on winter bills, moving house, or bundling with renovations to determine your ideal window.
What Questions Should You Ask Before Choosing a Date?
- Are your energy bills rising sharply?
- Are you planning home renovations soon?
- Will you stay at home long enough to benefit?
Frequently Asked Questions (FAQs)
Yes — installations are safe and often cheaper in colder months.
Usually no, but exceptions exist for listed or conservation buildings.
1–3 days on average, depending on system size and weather.
In the UK, May is typically the best month for solar panels in terms of energy generation. This is because it offers the ideal combination of long daylight hours and consistent sunshine without the extreme heat that can reduce panel efficiency. However, solar panels work year-round—even on cloudy days—so while output is highest in spring and summer, they still generate electricity in autumn and winter. The overall effectiveness of a solar system depends more on annual sunlight exposure and proper installation than any single month. For optimal performance, ensure your panels are installed at the right angle and kept clean throughout the year.
In the UK, the worst months for solar production are typically December and January. During this period, the days are shortest, the sun is at its lowest angle, and overcast weather is more common—all of which significantly reduce the amount of solar energy your panels can generate. Despite lower output in winter, solar panels still produce electricity even on cloudy days. UK solar systems are designed to perform efficiently year-round, with the higher production in spring and summer balancing out the seasonal dips. Proper system design and battery storage can also help maximise efficiency during the lower-production months.
Our Verdict
While you can install solar panels at any time of year, late winter to early spring is the most strategic time in the UK. It balances financial incentives, solar efficiency, and installer availability, setting you up for strong returns as summer approaches.
Myles Robinson is a seasoned expert in the boiler and home improvement industry, with over a decade of experience. He is deeply committed to environmental sustainability, actively promoting energy-efficient heating solutions to help households reduce their carbon footprint. By combining industry expertise with a dedication to environmental responsibility, Myles continues to lead efforts in transforming home heating practices towards a more sustainable future.
