Solar installations in the UK are about to get more expensive, regardless of the taxpayer funded subsidies arriving at the start of 2027. Three policy changes and one market shift are converging in the same few weeks. Two of the policies are designed to make solar more affordable, but in practice they will push prices up for anyone paying out of their own pocket.
This article explains the four reasons solar prices are set to rise, when each takes effect, and what it means for the payback on a solar system.
When a market is flooded with buyers who are not spending their own money, the price goes up for everyone who is. That principle runs underneath every section below. Grant funded customers and housebuilders working to a legal obligation are not price sensitive. The same supply chain serves them and serves homeowners paying full price out of pocket. The market does not separate the two.
This is the smallest of the four factors, but the easiest to quantify.
Since April 2022, residential solar installations have been zero rated for VAT. That covers panels, batteries, inverters, labour and scaffolding. The zero rate ends on 31 March 2027. From 1 April 2027, VAT on residential solar reverts to the reduced rate of 5%.
There is misleading content online suggesting solar is about to become 20% more expensive. That is not correct. The standard VAT rate is 20%, but residential solar sat on the reduced 5% rate before the zero rate was introduced, and it simply reverts to that rate.
In cash terms, most domestic solar systems will become between £500 and £750 more expensive.
In January 2026, the government launched the Warm Homes Plan, committing £15 billion of taxpayer money to upgrade 5 million homes by 2030. The solar specific target is to triple the number of UK homes with solar panels, an additional 3 million installations in roughly four years.
For context, the industry currently completes around 200,000 to 250,000 installations per year. Tripling that volume is a step change in demand.
For lower income households, the work is fully funded by the taxpayer. If combined household income is under £36,000, or you claim certain benefits, you may be eligible for a fully funded solar and battery package, typically worth between £10,000 and £12,000.
For everyone else, a consumer loan scheme is expected to launch around the start of 2027, offering low or zero interest financing for solar, batteries, heat pumps and insulation.
The part that often gets missed: grant funded households are not shopping around. They are not negotiating. They want the work done because it is paid for. When a large volume of non price sensitive buyers enters the market, the price rises for everyone else.
While the Warm Homes Plan is driving retrofit demand, a separate piece of legislation is doing the same thing on the new build side.
The Future Homes Standard was published in March 2026 and comes into force on 24 March 2027, one week before the VAT change. Under the standard, almost every new build home in England must have solar installed as standard. The required array size is at least 40% of the property's ground floor area, which for most homes is a substantial system.
Gas boilers are effectively out, as the carbon targets cannot be met with gas heating. Wales has introduced equivalent rules in force from March 2027.
The government's new build target is 1.5 million homes. Every one of them will require solar on the roof, and housebuilders cannot opt out. This is non price sensitive demand at scale, drawing on the same panel manufacturers, the same inverter supply, and the same installer workforce that the Warm Homes Plan is also competing for. The government's own impact assessment on the standard flags the risk of supply chain bottlenecks.
The fourth factor is already in motion.
Energy prices are rising, and that drives solar enquiries up. Following the recent Iran conflict, Octopus Energy has reported a 54% increase in solar enquiries over the past few months. At Spirit Energy, we have seen close to a 100% increase. Good installers are booked out months ahead, and labour is becoming harder to schedule.
The supply chain is global. Panels, batteries, inverters and mounting systems all sit in international markets. Raw material costs are up. China has been adjusting its export incentives on panels and batteries, pushing prices higher at source before any UK specific pressure even kicks in. Fuel costs feed into every service van and scaffolding lorry.
None of these increases is large on its own, but they accumulate across the cost of a typical installation.
Look at what arrives within a few weeks of each other.
The Future Homes Standard comes into force on 24 March 2027. The VAT zero rate ends on 31 March 2027. The Warm Homes Plan consumer loan scheme is expected to launch around the same period.
Three sources of upward pressure hitting the same market at the same time.
There is one more thing worth understanding. Electricity currently costs around 26p per kilowatt hour and is forecast to rise to 35p or more. A solar system saving you £1,000 a year at 26p saves closer to £1,400 a year at 35p. Nothing changes on the roof. The value goes up because grid electricity is getting more expensive.
Waiting to install solar does not just cost you the price increase on the system. It also costs you every month of electricity savings you are not making, while you continue to buy at full grid price.
Three government changes and one market shift are converging in spring 2027. VAT on residential solar rises from 0% to 5%, adding £500 to £750 to most systems. The Warm Homes Plan and Future Homes Standard will both pull large volumes of non price sensitive buyers into the same market at scale. Supply chain pressure and rising energy bills are already pushing labour and equipment costs up.
For homeowners considering solar, the practical takeaway is to get a system designed and quoted at current pricing. Spirit Energy will assess your roof, recommend an appropriate system, and provide a full financial model showing expected payback, savings, and rate of return.
If you're interested in seeing how much your roof could save you, please give us a call on 0118 951 4490 or request a quote.