In short
The government’s 2025/26 figures put the UK median at £1,595 per kW for systems up to 4 kW and the North West mean at £1,800, so 4 kWp comes to roughly £6,400 to £7,200 before extras. Listed buildings, thatch, conservation-area flat roofs and steep plots can add consent and access costs. VAT is 0% until 31 March 2027.
Where the price figures come from
The UK government’s energy department, DESNZ, publishes solar PV cost data drawn from the records of small installations certified under MCS. Each figure is the total installed cost for every kW of panel capacity, broken down by system size and by region. For 2025/26, the figures that matter for a house are these:
- Across the UK, the median price was £1,595 per kW for systems up to 4 kW and £1,546 per kW for those between 4 and 10 kW.
- In the North West, the mean was £1,800 per kW up to 4 kW and £1,627 per kW for 4 to 10 kW.
The two measures behave differently. A median is the middle price in the list, with half the jobs costing less and half more, so a handful of very expensive installations hardly shifts it. A mean adds every price together and divides by the number of jobs, so large or awkward installations pull it upwards, which is part of the reason the regional figure sits above the national one. Neither is a quote, a floor or a ceiling. They mark where typical prices have landed, and price per kW tends to fall as systems grow because access, paperwork and travel are shared across more panels.
A rough range by size
| System size | Price band used | At the UK median | At the North West mean |
|---|---|---|---|
| 3 kWp | up to 4 kW | £4,800 | £5,400 |
| 4 kWp | up to 4 kW | £6,400 | £7,200 |
| 5 kWp | 4 to 10 kW | £7,700 | £8,100 |
| 6 kWp | 4 to 10 kW | £9,300 | £9,800 |
The 3 and 4 kWp rows use the smaller band’s prices and the 5 and 6 kWp rows use the larger band’s, so the step from 4 to 5 kWp looks smaller than the others. On these figures a 4 kWp system comes out at roughly £6,400 to £7,200, and a 6 kWp one at about £9,300 to £9,800. If a quote for a straightforward roof lands well outside the table, ask what it includes; on its own that is not evidence of anything wrong. What each size might produce is on output on a Frodsham roof.
What the averages leave out
The national figures are totals across many thousands of jobs, with no breakdown of what each one contained. Some will have needed scaffold on three sides and some none at all; some came with a new consumer unit, a battery or a diverter, and some did not. To compare a quote with the table fairly, take the solar element on its own and list everything else beside it.
Costs particular to Frodsham homes
Four features of the town can add to a bill. None applies to every house, but each is worth raising before a price is agreed.
Listed and thatched buildings
The 2006 conservation area appraisal records many Grade II buildings along Main Street and a 17th-century thatched group. A listed house needs planning permission and Listed Building Consent, which means scaled drawings, fixing details, usually a heritage statement, and several weeks before a decision; the council can also attach conditions on appearance. Where the main roof is ruled out, an outbuilding or garden frame brings costs of its own, from footings and a frame to a trench back to the house. Thatch brings the insurer’s requirements. Listed and thatched homes covers the process.
The conservation areas
In the 4 conservation areas carrying Frodsham’s name, roof panels on an unlisted house usually need no application, but a flat roof needs the council’s prior-approval decision and a wall facing the road needs full permission. Each of those means drawings, a submission and time. The rules are set out on Frodsham’s conservation areas and solar.
Sloping and exposed sites
On Overton and the steeper streets, scaffold on uneven ground, carrying materials up from the road and any highway licence add to access costs, and an exposed position may call for a heavier fixing design. Overton and the hillside goes through those items.
Shade from the hill and trees
For homes at the foot of the hill south of the centre, the terrain takes about 3.6% of a south roof’s yearly output, roughly 137 kWh a year on a 4 kWp system. The installed price is the same, so each unit generated costs a little more. A careful shade measurement and, where trees cast patchy shade, panel-level electronics may add to the survey and the equipment. The hill and winter sun and trees and shade explain both.
Costs that come later
The installed price covers most of what a system costs over its life, but not everything. An inverter is the part most likely to need replacing before the panels wear out, so ask how long its warranty runs and whether it can be extended. Batteries lose capacity slowly with use. Some monitoring services carry a subscription. The home insurer needs to be told about the system and may adjust the premium. And if the roof itself needs work in future, the panels may have to come off and go back, with scaffold each time. None of this changes the decision for most households, but a quote that ignores it leaves the picture incomplete.
Timing the work
Scaffold is the cost most easily shared. If roof repairs, chimney work or new gutters are due, doing them while the scaffold is up for panels avoids paying for access twice. On a listed building or a conservation-area flat roof, the council’s decision adds weeks, so starting the application early keeps the job from drifting past a date that matters, such as the change in VAT below.
VAT
HMRC’s VAT Notice 708/6 sets a 0% rate on solar panels and batteries installed in homes until 31 March 2027, with 5% after that. VAT is part of the quoted price, so on a job that might finish close to the changeover, ask which rate the firm has assumed and what happens if the date slips.
Ways to pay
Cash on hand, paid in stages. Many households pay a deposit at order and the balance once the system is commissioned and the paperwork handed over. Keep the deposit modest, ask how it is protected if the firm fails, and do not pay in full before the job is finished.
The Warm Homes: Local Grant. In west Cheshire this grant can include solar PV, with funding until 31 March 2028. The home must be rated D to G on the EPC scale, and the owner-occupier or private tenant must qualify through benefits, a household income of up to £36,000 before tax or £20,000 after housing costs, or an eligible postcode. After their first property, landlords pay at least half. The council’s support schemes page explains the local route, and grants and schemes sets out every condition.
The Warm Homes Loan Scheme. A GOV.UK factsheet describes it. It is a loan and has to be repaid; read the factsheet’s own account of who can use it and on what terms before planning around it.
Credit arranged by a firm. Some firms offer finance. Check that the lender is authorised by the Financial Conduct Authority, compare the total amount repayable rather than the monthly payment, and ask about the cooling-off period before signing.
Borrowing against the house. Some households add the cost to a mortgage instead. That is a conversation for the lender or a mortgage adviser, and it secures the borrowing on the home.
Group buying. The council’s Switch Together Solar scheme gathers households into a group purchase. Its latest registration closed on 25 September 2026; watch the council’s page for any later round.
Putting two quotes side by side
Divide each quote’s solar price by its size in kWp and set the result beside the table. Then list what each includes: access, electrical work, any battery or diverter, the G98 or G99 paperwork, consent drawings and applications, and the warranties on panels, inverter and workmanship. Check each firm on the MCS installer search and at Companies House; the remaining checks are on choosing an installer, storage is weighed on batteries, and how many sites in the borough already have panels is on solar take-up. A quote already in hand can be raised through the question form; this guide prices nothing and sells nothing.