If you want to borrow against home equity in the UK, the first decision is not how much to ask for. It is how to raise the money without unnecessarily disturbing an existing mortgage. You might be planning an extension, helping family or covering a substantial one-off expense. Several routes can unlock some of your property’s value, but they work differently and carry different costs.
The main choices are a further advance from your current lender, remortgaging for a larger amount, or taking out a second-charge mortgage. Understanding them makes it easier to compare quotes without paying more than necessary.
Work out your equity, then your borrowing headroom
Home equity is the difference between your property’s current value and the mortgage debt secured on it. Suppose your home is worth £350,000 and you owe £200,000. You have approximately £150,000 in equity. That does not mean a lender will offer you £150,000 in cash.
Lenders consider loan-to-value (LTV), comparing total secured borrowing with the property’s value. If a lender permitted an overall LTV of 80%, total mortgage debt on that £350,000 home could be £280,000. With £200,000 outstanding, the theoretical extra borrowing would be £80,000, subject to valuation, credit, affordability and lender criteria.
Start with your latest mortgage balance, including other secured loans, and a realistic property valuation. For additional context, see our guide to loan-to-value ratios.
Three main ways to borrow against your house
Ask your lender for a further advance
A further advance adds borrowing through your current mortgage lender. It often carries a separate interest rate from your original mortgage, so ask about the combined repayments.
This can be attractive if you have a competitive fixed rate that you would rather keep. You avoid replacing that deal just to access funds. However, your lender still checks affordability, and its further-advance rate might not be the cheapest available.
Ask about borrowing limits, fees, the repayment term and whether overpayments are allowed. A shorter term may increase monthly payments but reduce overall interest.
Remortgage and borrow more
With a remortgage, you replace your mortgage with a new one, potentially from another lender, for more than your outstanding balance. The difference, after relevant fees and repayments, provides the extra funds.
This is worth considering when your deal is nearing its end. But switching during a fixed or discounted period may trigger an early repayment charge. An attractive new rate can become expensive if it replaces a low-rate mortgage on your entire balance.
Compare the cost of the full new mortgage, not just the extra cash. Our remortgaging costs checklist explains the charges to look for.
Take a second-charge mortgage
A second-charge mortgage is a separate loan secured on the same property while your first mortgage remains in place. You make payments on two borrowing arrangements, potentially to different lenders.
Homeowners sometimes choose this type of secured borrowing when changing their first mortgage would incur a substantial penalty or lose a favourable rate. Second-charge loans commonly have higher interest rates than first mortgages and can involve broker, valuation and legal fees.
In March 2026, the Financial Conduct Authority highlighted concerns about advice, fees and affordability assessments in the second-charge market. Compare alternatives carefully rather than assuming a lower monthly payment means better value.
Does a property equity loan mean the same thing?
The terminology can be confusing. Searches such as “property equity loan” or “borrow against house UK” often describe a goal rather than a single UK product. Unlike the home equity loans and home equity lines of credit discussed in American guides, UK homeowners generally encounter further advances, remortgages and second-charge loans.
Ordinary mortgage borrowing also differs from later-life equity release. A lifetime mortgage is a specialist arrangement generally aimed at older homeowners. Interest may be added to the balance, with repayment deferred until the property is sold following death or a move into long-term care. Specialist advice is necessary.
Compare total costs, not just monthly payments
When you release equity by borrowing, the debt remains secured against your home. A long repayment term can make the monthly payment look comfortable while increasing total interest. A payment affordable today may become difficult if income falls or a variable rate rises.
Compare interest rates and the annual percentage rate of charge where provided, arrangement and broker fees, valuation and legal costs, early repayment charges, total repayable amounts, and whether rates are fixed or variable. Check the cost of the extra borrowing separately from any changes to your existing mortgage.
Imagine needing £25,000 for building work with two years left on a low fixed-rate deal. Remortgaging might mean an exit penalty and losing that rate on a much larger balance. A further advance or second charge may preserve it, but could carry a higher rate on the £25,000. Comparing total costs over the same period is more revealing than advertised rates alone.
Check affordability and alternatives before applying
Lenders generally assess income, regular spending, existing debts, credit history, property value and the proposed loan. Substantial equity does not guarantee approval. Prepare evidence of income, bank statements, mortgage details and a clear reason for borrowing.
For home improvements, obtain itemised quotes and allow for unexpected costs. For debt consolidation, be especially cautious: moving unsecured credit card balances onto your home could increase the repayment period and put the property at risk if payments become unaffordable.
Compare unsecured personal loans or saving towards the expense, especially for smaller amounts. An FCA-authorised mortgage adviser can help assess complex deals and penalties. Our secured versus unsecured borrowing guide explores the trade-off.
Frequently asked questions
Can I borrow against my home if I still have a mortgage?
Potentially, yes. Further advances, remortgaging and second-charge mortgages all allow additional borrowing while an existing mortgage debt remains. Approval depends on equity, affordability and lender rules.
How much of my home equity can I borrow?
There is no universal percentage. Lenders set their own LTV limits and consider every loan secured on the property. Income and expenditure may further limit what you can borrow.
Will borrowing against equity change my mortgage rate?
A further advance or second charge may preserve your original rate, while remortgaging replaces the existing deal. Extra borrowing can have different rates and conditions.
Can I borrow against home equity with poor credit?
It may be possible with some lenders, but options could be limited and costs higher. Equity does not override affordability checks. Seek independent advice before risking your home.
Choose the route that fits your mortgage
Borrowing against home equity provides funds without selling, but the right route depends on your existing deal, the amount needed and your ability to repay. Start with your lender’s further-advance quote, compare remortgage and second-charge alternatives where appropriate, and calculate total costs on a like-for-like basis. Unlocking cash should not undermine your longer-term housing finances.