The short version
- A typical 3kW solar PV system is often around £4,800-£6,500 installed, while 4kW is around £6,000-£8,000 and 5kW is around £7,000-£9,000.
- Adding a battery increases the upfront cost, but may help you use more of your own solar electricity at home.
- Domestic solar installations in Great Britain are currently 0% VAT-rated until 31 March 2027, subject to the rules in force.
- The lowest quote is not always the best value: check workmanship, warranties, certification and whether the installer is MCS certified for SEG eligibility.
This guide explains typical installed costs for domestic solar panels, what is normally included, how the 0% VAT rule works in Great Britain, and why workmanship and certification matter just as much as the panels themselves.
What makes up the installed cost?
A solar quote should cover more than the panels on the roof. The installed cost normally includes the solar panels, inverter, roof mounting system, cabling, isolators, electrical work, labour, commissioning and the paperwork needed at the end of the job.
Scaffolding is often a significant part of the price, especially on taller or more awkward properties. The cost can also change if the roof is difficult to access, has fragile tiles, needs extra care around dormers or chimneys, or requires a more complex layout.
Paperwork and certification matter too. A properly completed installation should include the relevant electrical certification, product details and handover information. If you want to export unused electricity and access a Smart Export Guarantee tariff, you will usually need an MCS-certified installation.
How much do solar panels typically cost?
As a broad guide, a typical installed 3kW solar PV system is often around £4,800-£6,500. A 4kW system is commonly around £6,000-£8,000, and a 5kW system is often around £7,000-£9,000. These are general guide prices, not a promise, because every roof and home is different.
The right size depends on roof space, roof direction, shading, your household electricity use and whether you are usually at home during the day. Bigger is not automatically better if you cannot use or sensibly export the extra electricity.
Adding a battery will increase the total cost. A battery can be useful if you want to store solar electricity for the evening, but it is not always worth it for every household. The decision should be based on your usage pattern, tariff, budget and how long you expect to stay in the property.
How does the 0% VAT rule work?
In Great Britain, qualifying domestic solar panel installations are currently subject to 0% VAT until 31 March 2027. This applies to energy-saving materials under the rules in force, and it can reduce the upfront cost compared with paying the standard rate of VAT.
The 0% VAT rate is one reason many homeowners are looking at solar now, but it should not be the only reason to go ahead. A solar PV system still needs to suit your roof, your electrical setup and how you use energy at home.
If you are comparing quotes, make sure each one is clear about VAT. A proper quote should say what is included, whether VAT has been applied at 0%, and whether any optional extras, such as a battery, scaffolding or monitoring equipment, are included in the total.
Why is the cheapest quote not always best?
Solar panels are expected to sit on your roof and work for many years, so the quality of the installation is important. Poor workmanship can lead to avoidable roof issues, electrical problems, weak performance or difficulties if you need warranty support later.
When comparing quotes, check the inverter and panel warranties, the mounting system, the quality of the design, whether scaffolding is included, and who is actually doing the work. Also check MCS certification if you want access to Smart Export Guarantee payments for electricity you export.
AmpWell is a NICEIC-registered domestic electrician based in Brackley, covering Banbury, Bicester, Brackley, Towcester and Buckingham. We offer a free tailored survey and quote so you can make a clear, informed decision.
Common questions
Is a battery included in the price of solar panels?
Usually not unless the quote clearly says so. A battery is an optional extra and will increase the upfront cost, so it is worth checking whether the payback and convenience make sense for your home.
Do I need an MCS-certified installer?
If you want to access a Smart Export Guarantee tariff for electricity you export to the grid, you will usually need an MCS-certified installation. It also gives you a clearer route for documentation, standards and handover information.
Will 0% VAT make solar panels free from tax forever?
No. The current 0% VAT rate for qualifying domestic solar installations in Great Britain runs until 31 March 2027 under the rules in force, so it is time-limited unless the government changes it.
How do I get an accurate solar price for my home?
The best way is to have a tailored survey that looks at your roof, shading, electrics, energy use and whether a battery is worthwhile. AmpWell offers free quotes for homeowners in and around Brackley, Banbury, Bicester, Towcester and Buckingham.
