It’s the first question almost everyone asks: how much do solar panels cost? The honest answer is that there’s no single figure — the price depends on your roof, how much electricity you use, and the components you choose. Anyone quoting you a headline number before they’ve seen your home is guessing. What we can do is explain exactly what shapes the price, so you know what you’re paying for and can get a genuinely accurate quote.
What actually determines the cost of solar panels?
Every quote is built around a handful of key factors. Understanding them helps you compare installers fairly and spot a quote that’s been cut in the wrong places.
- System size — the number of panels your roof needs, driven by how much electricity you use. A larger system costs more upfront but generates and saves more.
- Panel and inverter quality — premium components perform better in low light and shade and last longer, so they influence both price and long-term value. We install trusted brands including SolarEdge.
- Your roof — pitch, orientation, tile type, height and access all affect the labour and scaffolding involved.
- Battery storage — optional, but it changes the total. More on that below.
- Extras — things like bird protection, an EV charger, or an immersion diverter to heat your water with spare solar power.
What should be included in the price?
A trustworthy quote is all-inclusive. When you compare installers, check the price covers everything — not just the panels on the roof. At DES Renewable Energy, our installations include:
- Panels, mounting system and a quality inverter
- Scaffolding, cabling and all electrical work
- Full MCS-certified installation and commissioning
- Registration for the Smart Export Guarantee, so you’re paid for the energy you export
- System handover, monitoring setup and ongoing aftercare
If a quote looks surprisingly low, it often excludes scaffolding, uses lower-grade components, or skips the certification you need to claim export payments. Cheaper rarely means better value over a system’s 25–30 year life.
Does adding a battery change the cost?
Yes. Battery storage lets you store the solar power you generate during the day and use it in the evening, instead of buying it back from the grid. It adds to the upfront cost, but it also dramatically increases how much of your own free energy you actually use — typically from around 40% to as much as 80% — and gives you resilience against rising prices. Whether it’s worth it depends on your energy habits, your tariff, and whether you have (or plan to get) an EV. We’ll talk you through it honestly at survey stage.
What brings the cost down?
Solar is more affordable than many people expect, thanks to a few current incentives:
- 0% VAT — residential solar and battery installations currently qualify for zero-rated VAT.
- Smart Export Guarantee (SEG) — your energy supplier pays you for surplus electricity you send back to the grid, giving you an income stream on top of your bill savings.
- Local schemes — grant and group-buy schemes appear from time to time across Dorset; we’ll flag any you’re eligible for when we quote.
Is solar worth it in Dorset?
For most homes on the South Coast, yes. Dorset and Hampshire enjoy some of the highest sunshine hours in the UK, so panels here generate strongly. Combined with rising electricity prices, 0% VAT and export payments, a well-designed system pays for itself over time and then delivers largely free electricity for the rest of its life. For a balanced view, read our honest guide to the advantages and disadvantages of solar energy.
Frequently asked questions
Why can’t you give a price online?
Because an accurate price depends on your specific roof and energy use. Rather than quote a misleading average, we survey your property and give you a precise, tailored figure — with no obligation to proceed.
How long do solar panels take to pay for themselves?
It varies with system size, your energy use and tariff, but most well-designed systems pay back well within their lifespan. After that, the electricity you generate is effectively free for the remaining years of the panels’ 25–30 year life.
Do I have to pay VAT on solar panels?
No — residential solar and battery installations currently qualify for 0% VAT in the UK, which keeps upfront costs lower than in previous years.
Do I need a battery?
Not necessarily. A battery is worth it if you use most of your electricity in the evening, want backup power, or plan to add an EV. We’ll advise honestly on whether it makes sense for your household rather than upselling.
Get an accurate quote for your home
The only way to know exactly what solar will cost — and save — for your property is a proper assessment. As MCS- and NAPIT-certified installers serving Bournemouth, Poole and the wider South Coast, we design each system around your roof, budget and energy use. See our accreditations, then get your free, no-obligation quote from our local team.
This guide is part of our complete guide to solar panels.