Second Charge Mortgage FAQ
General information only. This is not financial advice.
Last reviewed: 2026-06-06
When does a second charge mortgage make more sense than a remortgage?
A second charge mortgage lets you borrow against your property's equity without touching your existing first mortgage. It is typically preferable to remortgaging when: (1) you have a low fixed rate on your first mortgage you want to protect — remortgaging would mean losing that rate; (2) you are still within a fixed-rate deal with significant early repayment charges (ERCs); or (3) your circumstances have changed since the original mortgage was arranged and you may not qualify for the same deal on a remortgage today. In all three cases, a second charge preserves the first mortgage and adds separate borrowing alongside it.
What is the difference between a second charge and a further advance?
A further advance is additional borrowing from your existing first mortgage lender — effectively increasing your mortgage with the same lender. A second charge is a separate loan from a different lender, secured on the same property but sitting behind the first charge in priority. A further advance is usually simpler and potentially cheaper when your existing lender offers it. A second charge is the better option when your existing lender will not lend more, you want to avoid disturbing a competitive existing rate, or there are early repayment charges that make a remortgage too costly.
How much can I borrow on a second charge mortgage?
Second charge lenders typically lend up to 85–90% of the combined loan-to-value (CLTV) — the total of both first and second charge loans relative to the property value. If your property is worth £400,000 and your first mortgage balance is £200,000, a lender at 85% CLTV could allow up to £140,000 on a second charge (bringing total borrowing to £340,000). Actual amounts depend on your income, affordability assessment, credit profile, and individual lender criteria. This is illustrative only.
What does a second charge mortgage cost?
Second charge mortgages carry higher interest rates than first charge mortgages (typically 6%–12%+), reflecting the lender's lower priority in any repossession. Costs also include arrangement fees (1–3% of the loan), broker fees, a valuation, and legal fees. Residential second charge mortgages are FCA-regulated, meaning affordability rules apply. Before proceeding, always compare the total cost of a second charge — including all fees over the loan term — against the cost of remortgaging, factoring in any early repayment charge on the first mortgage.
Can I get a second charge mortgage on a buy-to-let property?
Yes. Second charge mortgages are available on buy-to-let properties, though fewer lenders offer them compared to residential second charges. Buy-to-let second charges are unregulated. Your first mortgage lender's consent is generally required before a second charge can be registered — some lenders give blanket consent, others require a formal request, and some may refuse or charge a fee. Rental income is assessed in the affordability calculation alongside any personal income. A specialist broker will know which second charge lenders accept buy-to-let security.
Do I need my first mortgage lender's consent for a second charge?
In most cases, yes. Registering a second charge creates a new legal interest in your property, which your existing first charge lender typically needs to approve. Many lenders include consent in their standard mortgage conditions for secured personal loans; others require a formal consent to mortgage (CTM) application. Some lenders decline or charge a fee. Your second charge broker will manage the consent process and advise whether your first charge lender is likely to agree. Without consent, the second charge cannot be registered.
Risk warning
Your home may be repossessed if you do not keep up repayments on your mortgage or any other loan secured against it. Think carefully before securing other debts against your home.
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