How to get solar panel quotes and compare them

How many quotes should you get?

Get at least three. Prices for the same size of system can differ by thousands of pounds, and comparing quotes is the easiest way to spot one that's too high, or one that's suspiciously cheap.

Only use installers that are MCS certified for solar PV. You need an MCS certificate to get paid for exported electricity under the Smart Export Guarantee, and most also belong to a consumer code (RECC or HIES), which gives you a complaints route and deposit protection.

What every quote should include

• System size in kW (for example 4.5 kWp) and the number of panels.
• Exact make and model of the panels, the inverter and any battery.
• A generation estimate in kWh per year, worked out for your roof using the standard MCS method.
• One all-in price including scaffolding, fitting, the electrical work, registration with your network operator and the MCS certificate.
• Warranties: panels, inverter, battery and the installer's own workmanship warranty, and whether that's insured.
• Payment terms: how much deposit, when the rest is due, and the installer's written terms and conditions.

How to compare quotes

1. Price per kW: divide the total price by the system size. This lets you compare a 4 kW quote with a 5 kW one fairly.
2. Price per kWh generated: divide the price by the yearly generation estimate. Lower is better, and it rewards good panel layout as well as low price.
3. Check the estimate is realistic: a typical UK system makes roughly 850 to 1,050 kWh per kW each year, depending on region and roof. See how much solar panels generate.
4. Run the numbers: put each quote's price and size into the solar payback calculator to see how many years each one takes to pay for itself.

For a sense of what's normal, see what solar panels cost in 2026. Remember that solar panels and batteries currently have 0% VAT, so a quote shouldn't add VAT on top.

Warning signs

• Pressure to sign today, or a "special price" that runs out tonight.
• A big deposit: RECC advises never paying more than 25% of the price up front, and making sure it's insured.
• "Free solar" offers or savings that sound far better than the calculator shows.
• No written generation estimate, or a vague list of equipment.
• Being asked to waive your right to cancel. If you sign at home or online you normally have 14 days to change your mind.

Before you sign

Check the installer on the MCS register, read the terms, get any changes added to the contract in writing, and keep copies of everything. Once installed, you should receive your MCS certificate, the electrical certificate and the warranty documents. You'll need the MCS certificate to apply for export payments.

Sources: RECC tips for choosing an installer, RECC deposit and warranty protection, MCS installer search, Citizens Advice cancellation letter, Reonic regional yield table.