Costs · 7 min read
Understanding solar panel costs in the UK.
Solar quotes can vary by thousands of pounds for what looks like the same system. This guide breaks down what you are actually paying for, where unnecessary margin tends to creep in, and the questions that quickly separate honest installers from the rest.
Key things to consider
Panels, inverter, and labour
Hardware is typically 50–60% of a quote. Labour, scaffolding, certification and DNO notification make up the rest. If the breakdown is missing, ask for one.
MCS certification
You need an MCS-certified installer to qualify for the Smart Export Guarantee. It is also a baseline trust signal — uncertified installers should be avoided.
Warranty terms
Look for 25-year panel performance, 10–12 year inverter, and a workmanship warranty of at least 5 years. Anything shorter is a red flag.
Pros
- Transparent quotes make comparison straightforward
- MCS-certified installers carry insurance-backed warranties
- Hardware prices have dropped steadily over the last 5 years
- Financing options exist for those who do not want to pay upfront
Cons
- Door-to-door sales pressure is still common in this market
- Inflated quotes from large national brands can be 30–40% higher
- Cheap installs often skip optimisers, monitoring, or quality inverters
- Battery upsells are not always justified on the maths
What it actually costs
Whole system pricing
A 4kW solar + 5kWh battery system fitted should land between £9,000 and £12,500. Anything materially above that needs explaining.
What inflates a quote
Premium brand mark-ups, oversized batteries, unnecessary optimisers on unshaded roofs, and finance commission baked into the price.
FAQs
Should I get more than one quote?
Always — at least three. The spread is usually wide enough to save thousands without compromising on quality.
Is finance a good idea?
It can be, but check the APR and total cost. Some 0% finance deals hide their cost in an inflated headline price.
Are cheaper panels worse?
Not necessarily. Tier-1 panels from less-known brands often perform identically to premium brands at a meaningfully lower price.
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