Autumn is a good time to install solar panels in the UK. Weather is usually settled enough for roof work, panels start saving money immediately because they run on daylight, and waiting until spring would forgo roughly a quarter to a third of a year’s generation. The main reasons to move now are the 31 March 2027 end of 0% VAT and rising electricity prices.
Less than most people think. The system will produce for 25 years or more, so the season you install in has a small effect over its life. What matters more is how long you wait, what you pay and what deadlines are coming up.
Solar panels work from daylight, not warmth, so a system installed in October starts offsetting your bill as soon as it is commissioned.
You are in the core group if you or your partner were receiving a qualifying means-tested benefit on the qualifying date for 2026/27, which suppliers have published as 23 August 2026. Qualifying benefits include Universal Credit, Pension Credit, Housing Benefit, Income Support, income-based Jobseeker’s Allowance, income-related Employment and Support Allowance, and certain tax credits. Check the official GOV.UK list for the exact conditions attached to each benefit.
Eligibility does not depend on whether you rent or own, how big your home is or what its energy rating is.
Autumn (Sept to Nov)
Often settled, but wind and rain get more likely
Popular, because the weather is mild
Savings start straight away. Ready for next summer.
Winter (Dec to Feb)
Cold, wet and windy days can cause rescheduling
Usually quieter, which can mean shorter lead times and more flexible dates
Installed and ready before the high-output months
Spring (Mar to May)
Good
Busy, as demand builds
Strong output starts immediately, but you waited months
Summer (June to Aug)
Best
Busiest, with the longest waits
Peak generation, but the longest queue
Several UK suppliers describe spring and autumn as the sweet spot for weather, and winter as the quietest time for installers. Treat the lead-time advantage in winter as a possibility, not a guarantee, because it varies by company.
Sign this month and your system would likely be running in November or early December. Weather can push dates by a few days, so build in some slack.
Roughly 25 to 35% of a year’s output arrives between October and March, because about 65 to 75% of annual generation happens between April and September.
An illustration for a 4kWp system generating around 3,800kWh a year: assuming 35% self-use, an import price of 26.32p and an export rate between 4p and 12p, the October to March share is worth roughly £110 to £225. That is the money you would forgo by waiting until spring. It is a modest figure, which is why timing should not be the main driver. It is also an illustration, not a forecast, because your usage and tariff will differ.
0% VAT on solar and batteries ends on 31 March 2027. On a typical £6,000 to £7,300 system, standard 20% VAT would add over £1,000. Ask any installer to confirm in writing how the 0% rate applies to your install date, particularly if your install might slip into spring. Do not assume the rate will be extended.
ECO4 is scheduled to close on 31 December 2026. If you are on a means-tested benefit and your home is energy-inefficient, check eligibility now. Our guide to the Warm Home Discount and other means-tested help explains the main schemes.
Electricity prices. The Ofgem cap for 1 October to 31 December 2026 puts electricity at 26.32p per kWh and the typical annual bill at £1,723. Commentators have predicted a further rise in January, though forecasts can change. Domestic electricity VAT is also removed from 1 October 2026 to 31 March 2027. A higher import price makes every unit your panels offset more valuable.
In genuine grant schemes you own the panels once they are fitted. Be wary of anything described as “free solar” that involves a lease, a roof-rental contract or repayments. Leased systems can complicate a later house sale.
Pros
Cons
The fastest way to see what a fair local price looks like is to compare several vetted quotes for your own roof. SolarForYou lets you compare quotes from MCS-certified installers in your area, so you can judge price, warranty and system design together before you commit
Yes. Weather is usually stable enough for roof work, the system starts saving from commissioning because panels run on daylight, and you will be ready for next spring. The bigger factors are the 31 March 2027 end of 0% VAT and rising electricity prices.
Neither wins outright. Winter is usually quieter for installers, which can shorten lead times, while spring has better weather but more demand. Installing earlier gives you savings sooner. Waiting for spring forgoes roughly a quarter to a third of a year’s generation.
Most homes take one to two days on the roof. From quote to completion the process usually takes two to four weeks, including survey, paperwork and scheduling. Weather can add a few days.
Zero-rated VAT on domestic solar panels and batteries runs until 31 March 2027. After that, the standard rate would apply unless the government extends it. Ask your installer to confirm in writing how the rate applies to your install date.
Yes, at lower output. A typical south-facing system makes around 29kWh per kWp in December, against about 119kWh per kWp in May, so winter output is roughly a quarter of the May peak.
