Home Solar Installation UK: Costs, Savings & Guide 2026

These are planning figures, not quotations. Your roof, location, system size and electricity use can move the numbers materially.

Is your home suitable for solar panels?

Solar works in the UK because photovoltaic panels generate electricity from daylight, not just strong sunshine. A south-facing, low-shade roof is useful, but east- and west-facing roofs can also generate useful electricity. Energy Saving Trust says an east- or west-facing system tends to produce around 15–20% less energy than one facing directly south.

The survey should assess roof orientation, pitch, shading, usable area and structural condition. Chimneys, trees, dormers and neighbouring buildings can reduce available space or create shade.

If the roof is likely to need major work soon, it can be cheaper to repair it before the panels are fitted. Removing and reinstalling an array later adds labour and scaffolding costs. For a deeper roof-condition check, see whether you need a new roof before installing solar panels. Energy Saving Trust similarly advises that renewing a roof covering first can be cheaper in the long run where work is already needed.

Electricity use matters too. A household that uses more power during daylight hours can normally consume more of its solar generation directly. Future plans such as an EV, heat pump or battery can also affect system sizing.

How large should a home solar system be?

Solar systems are described in kilowatt peak, or kWp. Your actual annual generation is measured in kilowatt hours, or kWh.

Energy Saving Trust currently describes an average domestic system as around 4.5kWp, typically using about 12 panels and 20–30m² of roof area. However, the right size should come from a property-specific design. Bigger is not automatically better if much of the extra electricity will be exported rather than used in the home.

Ask the installer to show the assumptions behind the annual generation estimate, including orientation, pitch, shading, location and system losses. If two quotes predict very different output from similar roof space, ask why.

Panel efficiency matters when roof space is tight, but warranty, manufacturer support, inverter choice and overall design also affect long-term value. If you are comparing equipment rather than complete installations, the existing guide to the best solar panels for UK homes can take that intent further.

How much does home solar installation cost in the UK in 2026?

Energy Saving Trust currently gives an average installed home solar PV cost of around £7,600. The exact figure depends on the number of panels, inverter, mounting system, roof access, scaffolding, cabling and any electrical upgrades.

A battery is a separate decision. Energy Saving Trust currently puts a typical 5kWh battery at around £4,600, although prices vary considerably by capacity and specification.

Qualifying installations of solar panels in residential accommodation are currently zero-rated for VAT across the UK until 31 March 2027. HMRC’s energy-saving materials VAT guidance says the rate is due to return to 5% from 1 April 2027 under the current rules.

Check whether the quote includes scaffolding, monitoring, DNO paperwork, commissioning, certification and warranty registration. A cheap headline figure can become less competitive once exclusions are added.

What happens from survey to switch-on?

The project normally starts with an assessment and site survey, followed by system design, network checks, scaffolding and scheduling.

On installation day, the team fits the mounting system and panels, runs cabling, installs the inverter and connects the system to the household electrical installation. The completed system is then tested, commissioned and explained to you.

For a typical home, the physical work commonly takes one to two days. More complicated roofs, larger arrays, electrical upgrades or battery storage can extend this.

For the full sequence from survey to handover, use the dedicated solar panel installation process guide rather than relying on a quotation that simply says “full installation”.

Do you need planning permission, MCS certification or DNO approval?

Planning rules depend on where you live and the property type. Many conventional rooftop systems fall within permitted-development rules, but restrictions can apply to listed buildings, conservation areas, flats and unusual installations.

In England, solar permitted-development rules were updated on 27 August 2026, with transitional provisions running to 27 August 2027. Check the current Planning Portal guidance for domestic solar panels rather than relying on an old summary. Rules differ elsewhere in the UK.

Your installer must also deal with the local Distribution Network Operator, or DNO. The connection route depends on the generating equipment and electrical configuration. Energy Networks Association guidance on connecting generation distinguishes smaller G98 installations from systems requiring other connection procedures. Batteries and export-limitation arrangements can affect the assessment.

MCS certification is a useful quality-assurance check. The current MCS solar PV installation standard covers areas including equipment, structural assessment, design and installation requirements.

Should you add a solar battery?

A battery stores electricity you do not use immediately, so you can use it later. This can increase self-consumption, particularly if the home is empty during the middle of the day.

However, a battery adds upfront cost, stores energy with some losses and normally has a shorter service life than the panels. Energy Saving Trust says a typical battery may last around 10–12 years.

Ask for separate solar-only and solar-plus-battery projections. Compare the extra battery cost with the extra annual saving, usable capacity, efficiency, warranty and likely replacement timing.

A battery can become more attractive if you have high evening demand, use time-of-use tariffs, own an EV or plan to electrify more of the home.

How do solar savings and export payments work?

Solar creates value in two ways. Electricity you generate and use at home reduces the amount you buy. Eligible surplus electricity can also be exported for payment.

Ofgem’s Smart Export Guarantee guidance explains that eligible small-scale generators can receive payments from participating electricity suppliers for exported electricity. Suppliers set their own tariff rates and terms, and your SEG supplier does not have to be the same company that supplies your household electricity.

Do not accept a payback claim unless the quote explains how much generation is expected to be used in the home, how much is expected to be exported and what electricity and export rates have been assumed.

Energy Saving Trust’s current examples show payback with export payments at roughly nine to twelve years across London, Manchester, Aberystwyth and Stirling, depending on location and occupancy. Those figures use July 2026 energy prices and should be treated as context, not a promise for your property.

How to compare home solar installation quotes

Give each installer similar information about your annual electricity use, roof, future EV or heat-pump plans and whether you are considering a battery.

Then compare the system size in kWp, exact panel and inverter models, generation estimate, shading assumptions, warranties, scaffolding, roof work, monitoring and grid paperwork.

Ask who handles the DNO process and what certification and handover documents you will receive. Compare savings using realistic assumptions. Unusually high output or unusually fast payback should be backed by a clear calculation.

The Get Free Quote home comparison service is designed to help homeowners compare written quotations, scope, warranties and provider information rather than making a decision from headline price alone.

A good proposal should show what the system is expected to generate, what it costs, what is included and what could change before installation.