How much can you save by timing your solar installation?
Have you considered that the season you install in can affect your price? It’s worth thinking about. In winter you’ll often pay less and wait less. Get the panels on your roof by spring and you’ll be in time for the full summer generation season. The biggest cost of all is waiting too long.
Read on to see how the seasons stack up on cost and waiting time, and which other deadlines you should factor in.
- Winter and autumn are cheapest. Demand is low, installers are keener, and you can save roughly 5 to 15% against the summer peak.
- Late winter to spring is the sweet spot. Booking in the quiet months and going live by March or April catches the whole high-generation season.
- Summer is the worst for value. Peak demand means the longest waits, the highest prices and scarce scaffolders.
- The 0% VAT rate ends on 31 March 2027. After that it reverts to 5%, so installing before then avoids a price rise on the whole system.
- Don’t over-optimise the season. A year of lost generation costs about as much as the seasonal discount, so book when you’re ready, aiming to be live for spring.
The short answer
If you want a single recommendation: get quotes in autumn or winter and aim to be installed and generating by early spring. That combination lands you the lower off-peak prices and shorter waits of the quiet season, while making sure your panels are live for April to September, when a UK system produces around three-quarters of its electricity.
That said, the truest answer is that the best time to buy is when the numbers work for your home, whatever the month. Treat the season as a way to optimise a decision you’ve already taken, not as a reason to keep waiting.
If you want to be generating by spring, start getting quotes in November or December. A quality install isn’t instant: quotes, a survey, network operator approval for larger systems and a scaffolding slot can span several weeks. Leaving it until February risks slipping into the spring rush and missing the early sunny months you were aiming for.
Season by season
| Season | Price & wait | Generation start | Verdict |
|---|---|---|---|
| Autumn (Sep-Nov) | Low, short | Ready for next spring | Great value, drier install weather |
| Winter (Dec-Feb) | Lowest, shortest | Ready for next spring | Best for price and availability |
| Spring (Mar-May) | Rising | Immediate, into the peak | Sweet spot to be live |
| Summer (Jun-Aug) | Highest, longest | Immediate, at the peak | Great output, worst for value |
In the quiet months, installers are more willing to negotiate and can often fit you in within weeks rather than months. The trade-off in deep winter is short days and the odd weather delay.
The 0% VAT deadline
Solar panels and home batteries currently carry a 0% rate of VAT in the UK, a saving applied across the whole installed system. That relief is set to end on 31 March 2027, after which VAT reverts to 5%.
For a typical domestic system that’s a meaningful sum added to the price overnight, whatever the season. Unless the relief is extended, installing before the deadline avoids that increase entirely. It’s the single strongest timing argument for not putting off a purchase you intend to make.
As 31 March 2027 nears, expect demand and installer waiting lists to climb as people rush to beat the deadline: the busy-season effect, but nationwide. If you’re planning solar within the next couple of years, booking well ahead avoids both the VAT rise and the last-minute scramble.
The demand and price cycle
Beyond the seasons, solar enquiries spike whenever energy costs are in the news. The Ofgem price cap is reviewed every three months, and each announcement reliably sends a wave of homeowners looking at solar, as do cold snaps and any jump in bills. Installers get busier and less flexible in those weeks, so quoting in the quieter stretches between them, rather than in the days after a scary headline, tends to get you faster responses and keener pricing.
The cost of waiting
A UK solar system typically saves a household hundreds of pounds a year. Waiting a full year to time a season perfectly, or to see whether prices drift down, forfeits a whole year of those savings, which is on a par with the 5 to 15% you might save by choosing winter over summer. Panel prices do fall over time, but slowly, on the order of a few per cent a year, and rarely fast enough to beat the loss from a year of not generating.
Buy now or hold?
The financial case already works for your roof and usage.
Your current energy bills are high and every month of delay is costing you.
You’re mid-summer and can hold a few months for cheaper off-peak quotes.
A roof repair, re-roof or extension should sensibly come first.
You’re still gathering and comparing quotes properly.
You’re moving house soon and wouldn’t see the payback.
- 0% VAT relief
- The zero rate of VAT on domestic solar and batteries in the UK, in place until 31 March 2027, after which it returns to 5%.
- Ofgem price cap
- The cap on default energy tariffs, reviewed every three months.
- DNO approval (G98 / G99)
- Network operator sign-off to connect a system: approval before installation for larger systems (G99), or notification within 28 days of switch-on for smaller ones (G98). Queues are shorter in the quiet off-season.
- MCS certification
- The quality standard your installer should hold, and a requirement for export payments and insurance-backed warranties.
- Smart Export Guarantee (SEG)
- The scheme paying you for surplus electricity you export, worth having in place whenever you install.
What is the best time of year to buy solar panels in the UK?
For the best price and shortest wait, autumn and winter, when demand is low. Book then and aim to be installed by early spring, so the system is live for the high-generation April-to-September period.
Is it cheaper to install solar panels in winter?
Usually, yes. Installers are less busy, so they’re more willing to negotiate, often saving 5 to 15% against the summer peak. Short days and the odd weather delay are the trade-off.
Should I wait for solar panel prices to drop?
Generally no. Prices fall only gradually, a few per cent a year, while a delayed system generates nothing in the meantime, so a year of lost savings usually outweighs any price fall.
Does the 0% VAT on solar panels end?
Yes. The 0% rate on domestic solar and batteries is due to end on 31 March 2027, after which it returns to 5%. Unless it’s extended, installing before that date avoids the increase.
When should I get quotes to be generating by spring?
Start in November or December. The process can take several weeks, so booking in late autumn leaves time to be commissioned by March or April. Leaving it to February risks the spring rush.
Do solar panels work if installed in winter?
Yes. Panels generate year-round, just less in winter, and a winter install is ready to perform when spring arrives. Winter installs are safe and common.
Buy in the quiet season, be live by spring
The best time of year to buy solar panels in the UK is the quiet stretch from autumn through winter, when prices are lower and waits shorter, timed so your system is commissioned by early spring. That gives you an off-peak price and a full first-year harvest of generation.
Two things override the seasonal game: the 0% VAT rate ends on 31 March 2027, and a delayed year of generation can cancel out the seasonal saving.
Get quotes in autumn or winter, aim to switch on by spring, and be installed comfortably before the VAT deadline. Once the numbers work, sooner beats perfect.
METHODOLOGY: Seasonal pricing, demand and wait-time patterns reflect UK installer practice in 2026, and vary by region, system size and market conditions. The 5 to 15% winter saving and generation split are indicative. The VAT position reflects the 0% relief scheduled to end on 31 March 2027.
DISCLAIMER: This guide is general information, not financial advice. Prices, incentives and deadlines can change. Always obtain multiple written quotes from MCS-certified installers and confirm current VAT and scheme rules before purchasing.
UPDATED & FACT-CHECKED: 11 October 2026.
