Are Solar Panels Worth It in the UK in 2026?

The short answer

For many UK homes with a suitable roof, a sensibly priced system and a long enough ownership period, solar panels can be worth it. They are not automatically a good deal, though. A high quote, heavy shading or unrealistic savings assumptions can turn a strong project into a weak one.

The useful question is not simply “do solar panels work in the UK?” They do generate electricity in cloudy weather. The useful question is: will this particular system produce enough bill savings and export income to justify its total cost?

What the current UK numbers say

Energy Saving Trust currently gives an average installed cost of about £7,600 for a domestic system of around 4.5 kWp. Its July 2026 examples, which include export payments, show simple payback periods of:

Location	Home all day	Home half the day	Out all day
London	9 years	9 years	9 years
Manchester	10 years	10 years	11 years
Aberystwyth	9 years	9 years	10 years
Stirling	11 years	11 years	12 years

Those figures are useful benchmarks, not promises. They are modelled examples for selected locations in England, Scotland and Wales. Your result can be better or worse because installer prices, roof geometry, shading, energy use and tariffs are specific to your home.

How solar panels create financial value

Domestic solar has two main sources of value:

Electricity you use directly. Every solar kilowatt-hour used in the home avoids buying a kilowatt-hour from your supplier.
Electricity you export. Surplus generation can be sold through an eligible export tariff such as the Smart Export Guarantee.

Annual solar value

solar used at home × import price + solar exported × export price

Then subtract any annual costs you have chosen to include.

From 1 July to 30 September 2026, the Ofgem price cap average electricity unit rate for a standard variable tariff paid by Direct Debit is 26.11p per kWh across England, Scotland and Wales. Your own tariff may be higher or lower, and the cap does not set fixed-tariff prices.

The Smart Export Guarantee does not have one national export rate. Participating suppliers set their own rates, contract terms and eligibility conditions, and the rate must be above zero. That is why a calculator should let you enter the tariff you can actually obtain rather than assume one universal payment.

A worked example: why assumptions matter

Illustrative example — not a national average

Assume a system costs £7,600 and generates 3,600 kWh in its first year. The household uses 45% of that generation directly, pays 26.11p/kWh for imported electricity and receives 10p/kWh for exports.

Used at home: 1,620 kWh × £0.2611 = about £423
Exported: 1,980 kWh × £0.10 = £198
Estimated first-year value: about £621
Simple payback using first-year value: about 12.2 years

Change the export rate, self-consumption, generation or installed cost and the answer changes. This is why a headline such as “solar pays back in nine years” should never replace a property-specific estimate.

The six factors that decide whether solar is worth it

1. The total installed price

Price matters more than brand prestige alone. Compare the full cost after any discount, including scaffolding, design, installation, commissioning, certification and any electrical or roof work. A cheap headline price that excludes essential work is not genuinely cheap.

2. Roof direction, pitch and shading

A south-facing, lightly shaded roof is usually easier to model, but east- and west-facing arrays can still be useful, especially when their generation pattern matches morning or afternoon demand. Heavy, persistent shade is more important than a less-than-perfect compass direction. Ask every installer to show the shading assumption and annual generation estimate.

3. System size and annual generation

System capacity is stated in kilowatt-peak (kWp). It is not the same as annual output in kilowatt-hours (kWh). Annual generation depends on location, orientation, pitch, shading, system losses and weather. The current MCS solar PV installation standard requires performance estimates to be presented as guidance rather than a guaranteed result because sunlight varies by place and year.

4. Self-consumption

Self-consumption is the share of solar generation used on site rather than exported. It often increases when washing machines, dishwashers, water heating, EV charging or other flexible loads run during daylight hours. But “use everything yourself” is not automatically the best goal: it makes no sense to waste energy merely to increase a percentage.

5. Import and export tariffs

The larger the gap between the price you avoid paying and the price you receive for exports, the more valuable direct use becomes. Tariffs change, so a credible calculation should test more than one scenario rather than assume today’s rate lasts for 25 years.

6. How long you will benefit from the system

Energy Saving Trust says panels should last 25 years or more. If you expect to move soon, you may not personally receive all of the future bill savings. Do not assume a particular increase in property value unless you have evidence relevant to your local market and home.

Does a battery make solar more worthwhile?

Sometimes — but not by default. A battery can move solar electricity from the middle of the day to the evening, increase self-consumption and provide access to some time-of-use tariffs. It also has its own purchase price, usable capacity, power limit, round-trip losses, warranty conditions and eventual replacement risk.

Energy Saving Trust says battery storage tends to cost around £5,000 to £8,000. That means the right question is not “will a battery increase my solar use?” It usually will. The right question is “will the additional savings created by this battery justify its additional cost?” Use the Solar Battery ROI Calculator separately from the panel calculation.

When solar panels are more likely to be worth it

You have a suitable roof with limited shading and enough usable area.
The quote is competitive and clearly includes all essential work.
You expect to remain in the property long enough to benefit from the savings.
The installer’s generation estimate is property-specific and its assumptions are visible.
You can use some electricity during solar hours or secure a worthwhile export tariff.
You are buying for long-term bill reduction, not a guaranteed short-term return.

When to be more cautious

The roof needs substantial repair soon, or its structural condition has not been assessed.
Shading is significant and the quote does not quantify it.
The proposal uses an unusually high electricity-price inflation rate to make future savings look larger.
The installer assumes a high self-consumption percentage without asking when you use electricity.
The sales presentation combines solar and battery savings but does not show each component separately.
You are using high-interest finance and the quote compares savings only with the cash price.

VAT, certification and export eligibility

HMRC’s current VAT guidance applies a temporary zero rate to qualifying installations of solar panels and electrical battery storage in residential accommodation until 31 March 2027; from 1 April 2027, qualifying installations are scheduled to revert to 5%. The installer is responsible for applying the correct treatment, and equipment bought without installation may be treated differently.

For consumer protection and access to common export arrangements, check that the installer and products meet the requirements relevant to your project. The MCS consumer guide explains the role of MCS certification, while RECC recommends obtaining at least three quotes and receiving a property-specific performance estimate and an all-inclusive written breakdown before signing.

How to decide for your own home

Collect 12 months of electricity usage and your current import tariff.
Get at least three itemised quotes for comparable system sizes.
Compare annual generation, shading, self-consumption and export assumptions — not just panel count.
Calculate the panels alone before adding a battery or finance.
Run conservative, central and optimistic tariff scenarios.
Check how long you expect to own the home and whether the roof will need work first.

Test your own numbers

Enter your system cost, annual generation, self-consumption, import tariff and export rate. The result is more useful than a national average because every assumption stays visible.