Russell Andrews
You do not need to pay for solar panels in one go. You can use savings, a personal loan, finance arranged alongside your installation, borrowing against your home or, since October 2026, a lower-rate loan under the Warm Homes Loan Scheme. This guide to solar panel finance compares the main ways to pay in plain English, so you can pick the one that fits your budget and start enjoying your system sooner.
The main ways to pay
Some of these options overlap. A Warm Homes loan may be arranged directly with a lender or through an installer, and the scheme can support different types of lending. Check the actual product, rather than choosing by its label alone.
| Option | How it works | Good for | Main point to check |
|---|---|---|---|
| Cash | You pay the installer directly. | Avoiding borrowing costs if you have spare cash. | How much cash you want to keep available afterwards. |
| Personal loan | You borrow from a bank or lender. It is usually repaid in monthly instalments over an agreed term. | Keeping the loan separate from your installer. | The APR, whether the rate is fixed or variable, fees, total repayment and purchase protection. |
| Installer-arranged finance | The installer or a broker arranges a loan through a panel of lenders. This is how we work. | Keeping the quote and the finance in one conversation. | The lender's terms, the broker relationship and the protection that applies. |
| Mortgage borrowing | A remortgage or further advance releases funds. | Homeowners considering mortgage borrowing with appropriate mortgage advice. | The security, fees and cost over the full term. |
| Warm Homes product | A lender offers a loan at a government-supported rate. See our scheme guide. | A government-supported rate on solar panels and batteries, within set limits. | Project eligibility, and the actual rate and term against other offers. |
| Promotional finance | A low or 0% rate for a limited period, with conditions. | Repaying quickly, if you meet every condition. | How long the offer lasts, the conditions and what happens afterwards. |
Which option suits which situation?
- You have spare cash and want to avoid borrowing costs: paying upfront avoids interest, but consider how much cash you want to keep available.
- You want to spread the cost and keep it simple: finance arranged with us puts your quote and your application in one conversation.
- You are considering borrowing against your home: it can offer a lower rate, so weigh it against the fees, the length of the term and the risk to your property.
- You want a government-supported rate on solar panels or a battery: the Warm Homes Loan Scheme may suit you, within its limits and conditions.
Whichever route you choose, ask each provider for the same three figures: the APR, the term and the total amount repayable. Solar panel finance is easiest to judge when every offer is shown on the same basis.
How to compare two offers
- Total amount repayable. For an interest-bearing loan, comparing the same amount and rate, a longer term lowers the monthly payment and raises the total, so look at both.
- The term. Choose the balance between a payment you are comfortable with and the cost of borrowing for longer.
- Early repayment. Ask about the repayment rules and any charges before signing. If you later choose to settle, request a current settlement figure from the lender.
- Fees. Look for arrangement fees and monthly fees.
- Section 75. It can apply to qualifying credit-card purchases and point-of-sale finance where the cash price is more than £100 and no more than £30,000. A general-purpose bank loan does not provide the same protection. Ask which rights apply to the actual agreement.
What representative APR means
A representative APR is the rate that at least 51% of accepted applicants responding to that promotion are expected to receive or better. Your own rate can differ after the lender checks your circumstances, so ask for your personal figures before you sign.
What about 0% finance and payment breaks?
Some offers advertise 0% for a short period, and some let you start repaying a few months after installation. Both can suit the right person. A 0% offer usually means a higher monthly payment over a short term. With a payment break, check how interest works on that particular product, because on some it builds from the start. We explain the exact figures for any option before you decide.
How the loan and the system fit together
Look at the two sets of figures separately: the amount you owe the lender and the energy benefit the system is expected to deliver. Your household budget needs to allow for repayments even when generation is lower, while your energy forecast should account for usage, tariffs and export income. We put both sets of figures alongside your system design. Savings cannot be guaranteed, and our guide to what to compare in a solar and battery quote explains which assumptions to look for.
Check for a grant first
If you may qualify for a grant, check that route before committing to borrowing. Our scheme guide explains the difference between a Warm Homes loan and the Warm Homes: Local Grant.
Where REST UK fits
We are a credit broker, not a lender. We introduce customers to regulated lenders and explain the options alongside your quote, so you do not have to work out the numbers alone. Our finance page explains the process.
Why homeowners choose REST UK
Finance is subject to status and lender approval. REST UK is a credit broker, not a lender (FCA 824643), and introduces customers to its lending partners. We do not give mortgage or whole-market financial advice. We may receive commission from the lender for introducing finance. Rates and terms are set by the lender and may change.