Personal loans and mortgages are both ways to borrow money, but they are fundamentally different products with different rates, terms, and risk profiles. Choosing the wrong one — for example, using a personal loan when a mortgage would have been cheaper, or taking on personal loan debt before a mortgage application — can cost thousands of pounds and limit your options. This guide gives you the clear comparison you need.
The Core Difference: Secured vs Unsecured
- Mortgage (secured): The lender takes a legal charge on your property. If you stop repaying, the lender can repossess your home. Because the lender has this security, they charge much lower interest rates and will lend much larger amounts over longer terms.
- Personal loan (unsecured): No collateral. The lender cannot take your home. If you stop repaying, they pursue you through the courts. Because of higher risk to the lender, rates are significantly higher and loan amounts and terms are more limited.
Key Comparison
| Mortgage | Personal Loan | |
|---|---|---|
| Secured against property | Yes | No |
| Typical APR | 3–6% | 5–25% |
| Typical loan size | £50,000–£1m+ | £1,000–£50,000 |
| Typical term | 10–35 years | 1–7 years |
| Application time | Weeks to months | Hours to days |
| Risk if you don't repay | Repossession of home | County Court Judgement (CCJ) |
| Early repayment | ERC may apply | 1–2 months' interest |
When to Use a Personal Loan
- Home improvements under ~£25,000 — if you do not want to remortgage or take a further advance, and the interest cost is acceptable.
- Car purchase — personal loans are a common and competitive option for car finance (compare with PCP deals).
- Debt consolidation — consolidating multiple high-rate debts (credit cards at 20%+) into a single personal loan at a lower rate. Saves interest if you do not re-accumulate card debt.
- Unexpected costs — boiler replacement, urgent repairs, medical costs where you need funds quickly.
- Wedding or holiday — though it is worth considering whether these costs should be saved for rather than borrowed.
When to Use a Mortgage (or Further Advance)
- Buying a property — the only realistic option for most people. Mortgages make homeownership possible with a deposit of 5–25% of the property value.
- Large home improvements (£20,000+) — a further advance (additional borrowing from your mortgage lender) or remortgage to release equity will typically be much cheaper than a personal loan for large amounts.
- Long-term borrowing — if you need to spread costs over many years, mortgage rates are substantially lower than personal loan rates over the same period.
Can You Use a Personal Loan as a Mortgage Deposit?
No — and you should not try. Mortgage lenders require proof that deposit funds are genuinely saved or gifted. A borrowed deposit increases your total debt exposure, and lenders view this unfavourably. You are required to disclose all debts on a mortgage application — and most lenders will decline or significantly reduce their offer if you have borrowed your deposit.
How Personal Loans Affect Mortgage Applications
Existing personal loans reduce the mortgage you can borrow because:
- Monthly loan repayments reduce your assessed disposable income.
- Outstanding loan balances increase your total debt level.
- Both factors reduce the lender's assessed affordability.
If you plan to apply for a mortgage within 12–24 months, paying down or avoiding personal loans can significantly increase the mortgage amount you are offered. Use the Loan Calculator to model repayment scenarios, and the Mortgage Calculator to see what different loan amounts cost.