When comparing borrowing options, "which is cheaper" isn't always as simple as comparing headline interest rates. Personal (unsecured) loans and secured loans work fundamentally differently, and the true cost depends on more than just the APR.
What's the difference?
A personal loan (unsecured loan) is lent based on your income and creditworthiness alone, with no asset attached as collateral. A secured loan — often called a homeowner loan or second charge mortgage when secured against property — uses an asset, almost always your home, as security. If you fail to repay a secured loan, the lender can ultimately force the sale of that asset to recover the debt.
Why secured loans often have lower headline rates
Because the lender has recourse to a valuable asset if you default, secured loans are generally viewed as lower risk to the lender than unsecured lending, which is often reflected in lower advertised interest rates — particularly for larger loan amounts. This is especially true for borrowers who might not qualify for the very best unsecured rates due to credit history or income relative to the loan size.
Why "cheaper rate" doesn't always mean "cheaper overall"
- Fees: Secured loans often come with arrangement fees, valuation fees and legal costs that unsecured loans typically don't have.
- Longer terms: Secured loans are frequently offered over longer terms (sometimes 10-25 years) which can significantly increase total interest paid even at a lower rate, compared to a shorter unsecured loan term.
- Early repayment charges: Some secured loans carry ERCs that unsecured personal loans often don't.
The risk dimension: what "secured" really means
This is the single most important difference. With an unsecured personal loan, missing payments will seriously damage your credit file and can lead to debt collection or County Court action, but your home isn't directly at risk. With a secured loan, missed payments can ultimately lead to repossession of the secured asset — a materially more serious consequence that shouldn't be underweighted just because the headline rate looks attractive.
When a personal loan usually makes more sense
- You're borrowing a smaller amount (typically under £25,000) where competitive unsecured rates are widely available
- You want a shorter, clearly defined repayment term
- You'd rather not put your home at any additional risk, regardless of the interest rate difference
- You want a faster, simpler application without valuation or legal steps
When a secured loan might be worth considering
- You need to borrow a larger sum than unsecured lenders are willing to offer
- You have existing mortgage borrowing that makes a further advance from your mortgage lender unavailable or less attractive
- Your credit profile makes competitive unsecured rates hard to access, but you have significant equity in your home
- You've compared the total cost carefully and it's genuinely cheaper even after fees, and you fully accept the risk involved
Alternatives worth comparing first
Before choosing either route, it's worth checking whether a mortgage further advance (borrowing more from your existing mortgage lender) might be cheaper than a separate secured loan, and whether your borrowing need might be better met by remortgaging altogether if your current deal is ending soon. See our guide to second charge mortgages for more detail on this specific type of secured lending.
If this applies to your situation, our guide on Secured vs Unsecured Loan Risk Visualiser covers it in more depth.
To run your own numbers, try our Loan Repayment Estimator.
The bottom line
Secured loans can offer lower headline rates, particularly for larger amounts, but they put your home on the line — a risk that shouldn't be treated lightly regardless of the rate saved. Always compare the full cost over the whole term, and be honest with yourself about your ability to maintain repayments before accepting any loan secured against your property.