Are Solar Panels Worth It in the UK in 2026?

Solar panel installations in homes are zero rated for VAT until 31 March 2027, under HMRC VAT Notice 708/6. From 1 April 2027 they return to the reduced rate of 5%, not the standard 20%, so installing before the deadline saves about £300 on a £6,000 system.

Your savings come from two sources: reducing what you buy from the grid (bill savings) and selling what you do not use (export income through the Smart Export Guarantee).

The difference between "with battery" and "without battery" is striking. Without a battery you export around four fifths of your solar generation at 12p per kWh. With a 5 kWh battery you use about 52% yourself at the full 26.32p per kWh rate. But the battery adds only about £180 a year overall, because every kWh you store is one you no longer get paid to export, and it needs replacing after 10 to 12 years. On solar alone it does not pay for itself.

A 4 kW system in southern England with a south facing roof and no battery pays for itself in about 10.8 years: £6,000 divided by £556 a year. The same system pays back in 11.9 years in northern England and 12.6 years in Scotland, and in 13.2 years on an east or west facing roof. Add a 5 kWh battery and payback stretches to about 21 years, because the battery wears out after 10 to 12 years and has to be bought again before the system has paid for itself. After payback, the panels keep earning for the rest of a life of 25 years or more.

Over 25 years, allowing for panels losing 0.5% of their output a year, a 4 kW system without a battery returns about £7,200 more than it cost at today's prices. With a battery, and one replacement battery, the figure falls to about £2,200. Neither figure includes replacing the inverter. Our solar payback guide breaks this down by region, roof and system size.

High upfront cost. £4,000 to £10,000, depending on size, is a significant sum. Unlike a heat pump, which can get the £7,500 Boiler Upgrade Scheme grant, solar has no grant open to every household, although 0% VAT helps. In England, the Warm Homes: Local Grant can pay for panels for households on lower incomes, usually £36,000 a year or less, in homes rated EPC D to G. The payback is real but takes about 11 to 12 years to arrive on a south facing roof.

Roof dependency. South facing roofs generate the most. East or west facing roofs produce about 20% less, according to PVGIS modelling for a 35 degree roof. North facing roofs are generally not recommended. Your roof also needs to be in good condition, as panels are installed for 25 years or more and removing them for roof repairs is expensive.

Winter shortfall. In London a 4 kW array makes about 142 kWh in December against 477 kWh in July, so December produces about 30% of what July does, and October to March together produce only about a third of the year's output. You will still rely heavily on grid electricity in winter, which is when you use the most.

Inverter replacement. The inverter, which converts the panels' direct current into the alternating current your home uses, needs replacing after around 12 years, according to the Energy Saving Trust. Most come with at least a five year warranty, which can often be extended. Ask installers to price a replacement when they quote, because our 25 year figures leave it out.

Visual impact. Some people dislike the appearance of panels on their roof. Solar panels on houses are usually permitted development, so planning permission is not normally needed, but listed buildings, conservation areas and national parks can have extra rules.

The Energy Saving Trust puts home batteries at £1,500 to £10,000, with a 5 kWh system at around £4,600. A battery increases the proportion of solar electricity you use from about 19% to about 52% with a 5 kWh unit, or about 59% with a 10 kWh one, on a 4 kW array. Those are the MCS MGD 003 look-up table figures the solar calculator reads. The extra bill savings are around £330 a year for a 5 kWh battery and around £400 for a 10 kWh one, but you give up export income on the same units, so the net gain is nearer £180 to £220 a year. At £180 a year, a £4,600 battery takes about 26 years to pay back.

The financial case for a battery is strongest if you use most electricity in the evening (when solar is not generating), you are on a time-of-use tariff (charge the battery at cheap rates overnight), or you want maximum independence from the grid.

The financial case is weaker if you work from home and use electricity throughout the day (the MCS tables put self-use at 23% rather than 19%, so there is slightly less daytime surplus for a battery to catch), or the battery cost exceeds the additional savings over its 10 to 12 year lifespan.

You do not have to decide now. A battery can be added to existing panels later, and a retrofitted battery also qualifies for 0% VAT until 31 March 2027. Our solar battery guide works through the numbers.

This is one of the most common complaints from solar panel owners, and it almost always comes down to timing.

Solar panels generate electricity during daylight hours, peaking around midday. If you are at work during the day and use most electricity in the evening (cooking, heating, entertainment), you miss the peak generation window. The solar electricity gets exported at 12p/kWh, and you buy grid electricity at 26.32p/kWh in the evening.

Solutions: add a battery to store daytime generation for evening use, shift high-consumption tasks (dishwasher, washing machine, EV charging) to daytime hours using timers, or switch to a time of use tariff with a cheap overnight rate.

Also check that your system is performing as expected. Shading from trees or new buildings, dirty panels, or an inverter fault can all reduce generation below the forecast.

Solar panels and heat pumps work well together, with a limit worth knowing. Most heat pump demand falls in winter, when panels produce least, so solar covers only part of a heat pump's electricity. It helps most with hot water in summer and with heating in spring and autumn, when the days are longer and some heating is still needed.

A heat pump also raises your electricity use, and the MCS tables show that a bigger household demand means more of your solar is used at home rather than exported, which improves the solar payback. The Energy Saving Trust notes that a battery saves more money running a heat pump, alongside a time of use tariff, than it does storing surplus solar.

If you are planning both improvements, the recommended order is: insulate first, then install the heat pump (claiming the Boiler Upgrade Scheme grant of £7,500, or £9,000 if you are replacing oil or LPG, available until March 2027), then add solar panels. This sequence ensures each improvement is sized correctly for the insulated, heat-pump-heated home.

In our EPC model, solar panels add about 8 points to your EPC rating. For landlords close to a band boundary, this can be the difference between meeting and missing minimum standards. Combined with insulation and a heat pump, solar helps push a property towards Band B or even A.

Generation from PVGIS (EU JRC). Self-use from MCS MGD 003. Electricity rates from Ofgem, October to December 2026. Export rates from Octopus Energy and E.ON Next, checked 25 September 2026. Installed costs checked against the DESNZ solar PV cost data (May 2026), with the MCS and Energy Saving Trust averages. Battery cost and lifespan, and inverter life, from the Energy Saving Trust. VAT from HMRC VAT Notice 708/6. See our full methodology.