A typical 5kWp solar system in the UK costs £7,000–£9,000 fully installed in 2026, including panels, inverter, mounting, scaffolding, MCS certification, and all electrical work. That is at 0% VAT, which applies to residential solar until at least March 2027. Smaller 3kWp systems start from around £4,500. Larger 10kWp systems reach £11,000–£13,000.
Those are the real numbers. Here is the full breakdown.
Solar Panel Costs by System Size (2026)
These are fully installed prices including panels, inverter, mounting hardware, all electrical work, scaffolding, and MCS certification. All prices reflect the current 0% VAT rate for residential installations. Prices assume a standard pitched tile roof with straightforward access.
| System Size | Approx. Panels | Annual Generation (Midlands) | Installed Cost Range | Best For |
|---|---|---|---|---|
| 3kWp | 7–8 | ~2,700 kWh/yr | £4,500 – £6,000 | 1–2 bed / low usage |
| 4kWp | 10 | ~3,600 kWh/yr | £6,000 – £8,000 | 2–3 bed semi |
| 5kWp | 12–13 | ~4,500 kWh/yr | £7,000 – £9,000 | 3–4 bed detached |
| 6kWp | 15 | ~5,400 kWh/yr | £8,500 – £11,000 | 4–5 bed / high usage |
| 8kWp | 19–20 | ~7,200 kWh/yr | £9,500 – £12,000 | Large home / EV owner |
| 10kWp | 24–25 | ~9,000 kWh/yr | £11,000 – £13,000 | Max domestic / small commercial |
The 4–5kWp system is what we install most often across Milton Keynes and Buckinghamshire. It suits a 3–4 bed home with a straightforward roof, costs £6,000–£9,000 installed, and generates enough to cover most of a household’s daytime electricity needs.
What Affects the Price
Two identical-looking houses can get quotes £2,000 apart. Here is what is actually driving the variation.
Panel Brand and Efficiency
Solar panels range from budget Tier 2 products at around £120 per panel to premium Tier 1 panels (Longi Hi-MO X6, REC Alpha, SunPower) at £200–£250 per panel. The difference in efficiency is typically 18% vs 21–22% — meaning premium panels produce more electricity per square metre of roof. On a 10-panel 4kWp system, that is a £800–£1,300 cost difference. Premium panels also carry better warranties: 25-year product guarantees are standard at the top end versus 10–12 years for cheaper options.
Inverter Type
A string inverter is included in standard quotes and handles most roofs fine. It converts DC from all your panels together and costs £500–£1,000 for a quality unit. Microinverters or DC power optimisers cost an extra £500–£1,200 but improve performance where panels face different directions or experience partial shading. We recommend them where there is a measurable performance benefit — not as a default upsell.
Roof Complexity and Access
A standard pitched concrete tile roof on a two-storey house is the cheapest to install on. Price increases where the roof requires:
- Specialist fixings for natural slate (fragile, needs care)
- Flat roof mounting frames or ballasted racking systems
- Complex scaffolding due to dormer windows, L-shapes, or three-storey properties
- Structural reinforcement for older timber roof frames
Most modern houses in Milton Keynes and surrounding areas have concrete tile roofs — the easiest and cheapest type to install on. If you have an unusual roof, expect to pay £500–£2,000 more.
Scaffolding
Scaffolding is included in every legitimate quote we issue. For a standard two-storey house, it costs £400–£700 within the total price. If a quote omits scaffolding or lists it as a variable extra, that is a red flag. Every installation that puts workers on a roof requires scaffolding by law.
Number of Stories and Property Type
Bungalows are cheaper to scaffold than three-storey townhouses. Detached houses usually have simpler scaffold runs than terraces. The physical complexity of getting panels onto the roof is a real cost driver, particularly when multiple scaffold lifts are involved.
Get three quotes and compare them line by line. Check each one specifies the panel brand, inverter model, total kWp, scaffolding, MCS certification, and DNO notification. Quotes missing any of these are not comparing like for like.
0% VAT — What Qualifies and How Much You Save
Since April 2022, all residential solar panel installations in the UK have been zero-rated for VAT. The 0% rate applies to:
- Solar panels
- Inverters
- Battery storage units
- Mounting hardware
- Installation labour
It does not apply to scaffolding-only contracts, pure electrical works unrelated to solar, or commercial installations above 1MW. For most homeowners, everything in the quote is covered at 0%.
The VAT saving is substantial:
- 4kWp solar system at £7,000: saves £1,400 vs 20% VAT
- 5kWp solar system at £8,000: saves £1,600 vs 20% VAT
- 5kWp solar + 10kWh battery at £13,000: saves £2,600 vs 20% VAT
The 0% VAT policy is confirmed until March 2027. There is no commitment beyond that date. If you are weighing up timing, the VAT saving is a material reason to act before March 2027 rather than after.
Lock in 0% VAT before the March 2027 deadline.
Get Your Free QuoteGrants: SEG and ECO4
Smart Export Guarantee (SEG)
The SEG is not a grant — it is an ongoing payment scheme. Every unit of surplus electricity you export to the grid earns you money. In 2026, SEG rates range from 4p/kWh (minimum legal rate) up to 15p/kWh with the best fixed tariffs. Time-of-use export tariffs like Octopus Flux can pay even more during peak grid demand periods.
On a typical 4kWp system exporting around 1,800 kWh/year, that is £72–£270 per year in export income. You need a smart meter and an MCS-certified installation to qualify. Your installer handles MCS; your energy supplier handles the smart meter (it is free).
See our full grants and incentives guide for SEG tariff comparisons and how to apply.
ECO4 Scheme
ECO4 (Energy Company Obligation 4) funds energy-efficiency upgrades including solar panels for fuel-poor households. To qualify in 2026, you typically need to:
- Be receiving a means-tested benefit (Universal Credit, Pension Credit, etc.)
- Have a low EPC rating (D or below)
- Own or privately rent the property
ECO4 can cover the full cost of a solar installation for qualifying households. It is not widely available — the majority of applications are managed through local authorities and energy companies. If you think you may qualify, contact your energy supplier or local council first.
There is no general solar panel grant for standard homeowners in 2026. The 0% VAT is the biggest saving available. ECO4 covers lower-income households. The SEG provides ongoing income from exports. These are the three pillars of financial support — not a single upfront grant.
Payback Period: Real Examples at 24.67p/kWh
Payback period = total system cost ÷ annual savings. We are using the Ofgem Q2 2026 unit rate of 24.67p/kWh and a SEG export rate of 10p/kWh for these examples. Generation figures are based on 900 kWh per kWp per year (Milton Keynes / Midlands average).
Example 1: 4kWp Solar, No Battery (£7,000 installed)
- Annual generation: 3,600 kWh
- Self-consumed (50%): 1,800 kWh × 24.67p = £444 saved
- Exported (50%): 1,800 kWh × 10p = £180 earned
- Total annual benefit: £624
- Payback: 11.2 years
Example 2: 5kWp Solar, No Battery (£8,000 installed)
- Annual generation: 4,500 kWh
- Self-consumed (50%): 2,250 kWh × 24.67p = £555 saved
- Exported (50%): 2,250 kWh × 10p = £225 earned
- Total annual benefit: £780
- Payback: 10.3 years
Example 3: 5kWp Solar + 5kWh Battery (£12,000 installed)
- Annual generation: 4,500 kWh
- Self-consumed with battery (75%): 3,375 kWh × 24.67p = £832 saved
- Exported (25%): 1,125 kWh × 10p = £113 earned
- Total annual benefit: £945
- Payback: 12.7 years
These payback figures are based on today’s electricity price of 24.67p/kWh. Energy prices have risen significantly over the past decade. Every 1p/kWh increase in the grid rate adds roughly £25–35/year to your savings — shortening payback without you doing anything differently.
Using your solar electricity during daylight hours (running high-load appliances between 10am and 3pm) pushes self-consumption above 50% and shortens payback meaningfully. A family at home during the day routinely hits 60–70% self-consumption without a battery.
Battery Storage Add-On Costs
A battery storage system captures surplus solar electricity generated during the day and makes it available in the evening, when the sun is not shining. This increases your self-consumption rate from around 50% to 70–80%, which is the most cost-effective way to use more of what your panels produce.
Battery Costs (2026, Installed)
| Battery Capacity | Typical Use Case | Installed Cost |
|---|---|---|
| 5kWh | 3kWp–4kWp solar system, 1–2 person household | £3,500 – £4,500 |
| 10kWh | 4kWp–6kWp solar, family home | £5,500 – £7,000 |
| 13.5kWh (Tesla Powerwall 3) | 5kWp+ solar, large home / EV owner | £7,500 – £9,000 |
Battery and solar installed together at the same time is cheaper than retrofitting a battery later. Adding a battery at point of installation saves £500–£1,000 in avoided scaffold and electrical duplication costs.
See our solar and battery packages page for combined pricing, or our battery storage page for standalone battery information including the Tesla Powerwall 3.
What Should Be in Every Quote
A complete, reputable solar panel installation quote includes all of the following. If anything is missing, ask why before signing anything.
- Solar panels — specified by brand, model, and wattage per panel
- Inverter — string, micro, or optimised (specified, not generic)
- Mounting hardware — roof hooks, rails, clamps suitable for your roof type
- All DC and AC electrical work — from panel to consumer unit
- Scaffolding — included, not a variable extra
- MCS certification and registration — required for SEG and all future incentives
- DNO notification — informing the grid operator (G99/G98 compliance)
- System monitoring setup — so you can see what your system is doing
- Product and workmanship warranties — at least 10 years workmanship, 25 years panel performance
Want a fixed price with no hidden extras? We survey every home before quoting.
Book a Free SurveyFrequently Asked Questions
Frequently Asked Questions
How much do solar panels cost in the UK in 2026?
A typical 5kWp solar system costs £7,000–£9,000 fully installed in 2026. Smaller 3kWp systems start from £4,500. Larger 10kWp systems cost £11,000–£13,000. All prices include 0% VAT, which applies to residential solar until at least March 2027. These figures include panels, inverter, mounting, scaffolding, MCS certification, and all electrical work.
What is the most popular solar panel system size?
The 4–5kWp system is by far the most common for UK homes. It suits a 3–4 bedroom house, costs £6,000–£9,000 installed, and generates 3,600–4,500 kWh per year in the Midlands. It is the best balance between cost, roof space used, and annual output for the typical British household.
Does 0% VAT apply to solar panels in 2026?
Yes. All residential solar panel installations are zero-rated for VAT until at least March 2027. This applies to panels, inverters, batteries, and installation labour. On a £8,000 system, that saves £1,600 compared to paying standard 20% VAT. There is no guarantee the 0% rate continues beyond March 2027 — it is worth acting before that date.
How much does adding a battery to solar panels cost?
A 5kWh battery costs £3,500–£4,500 installed. A 10kWh battery costs £5,500–£7,000. The Tesla Powerwall 3 (13.5kWh) costs £7,500–£9,000 installed. Installing battery and solar at the same time saves £500–£1,000 versus retrofitting the battery later.
What is the payback period for solar panels?
At current electricity prices of 24.67p/kWh, a 5kWp system costing £8,000 pays back in roughly 10–11 years through bill savings and SEG export income. With a battery increasing self-consumption, payback is similar despite the higher upfront cost. After payback, you have 15–18 years of effectively free electricity within the panel warranty period.
What grants are available for solar panels in 2026?
There is no general solar grant for standard homeowners. The main supports are 0% VAT (saving £1,400–£2,600 depending on system size), the Smart Export Guarantee (paying up to 15p/kWh for surplus electricity exported to the grid), and ECO4 for qualifying fuel-poor households which can cover full installation costs. See our grants and incentives page for full details.
Are solar panel prices going up or down in 2026?
Panel hardware costs have stabilised after falling sharply over the past decade. Installation labour costs have risen with general wage inflation. Total installed system prices are broadly flat in 2026. The biggest saving opportunity remains the 0% VAT rate — which represents £1,400–£2,600 in savings that disappears if the rate reverts to 20% after March 2027.
What should be included in a solar panel installation quote?
Every complete solar quote should include: solar panels (brand and model specified), inverter, mounting hardware, all DC and AC electrical work, scaffolding, MCS certification, DNO notification, system monitoring, and product and workmanship warranties. If scaffolding or MCS certification is listed as an extra, ask why — these should be standard inclusions from any legitimate MCS-certified installer.
Ready for a real quote?
We are MCS & NAPIT certified solar installers based in Milton Keynes. Free survey. Fixed price. No hidden extras. Use our solar calculator or call us directly.
Solar Calculator Solar & Battery Packages