Your home may be repossessed if you do not keep up repayments on your mortgage. Releasing equity increases your mortgage balance and total interest costs. Ensure you can sustain the higher mortgage payment for the full term.
Quick answer
Remortgaging to fund home improvements means borrowing more against your property than your current outstanding mortgage balance. The excess is released as a cash lump sum. You benefit from a lower interest rate than a personal loan, but you are spreading the cost over a much longer term and securing it against your home. For significant works, this can be very cost-effective - but the arithmetic must be checked carefully.
Mortgage advice note: This page provides general information only. For personalised advice, speak to an FCA-authorised mortgage adviser who can assess your individual circumstances.
How Equity Release via Remortgage Works
If your home has increased in value since your original purchase, or if you have paid down a significant portion of your mortgage, you may have equity available to release. The process:
- Your current property is valued (by the new lender)
- The lender calculates the maximum you can borrow based on their LTV limit
- Your new mortgage is for the amount needed to clear the old mortgage, plus the additional funds
- At completion, your old mortgage is repaid and you receive the improvement funds
Home Improvements That Typically Add Value
Not all improvement spending is equal in terms of property value added. Investments that typically add measurable value in the UK include:
- Extensions (rear, side, loft conversions)
- Additional bathrooms or en-suites
- Open-plan kitchen/dining conversions
- High-quality kitchen and bathroom renovations
- Energy efficiency improvements (insulation, heat pumps, solar)
Highly personal improvements (ornamental landscaping, home cinemas, swimming pools) may not add proportional value for most buyers.
The Key Financial Consideration
Mortgage interest is lower than personal loan interest, but the debt runs for much longer. Be explicit about the total interest cost at completion, not just the monthly payment change. Use a proper mortgage calculation rather than estimating. An independent mortgage adviser can model this for you.
Frequently Asked Questions
For larger improvement budgets, remortgaging often delivers a substantially lower interest rate than a personal loan - sometimes 3-4 percentage points lower. The trade-off is that the debt is spread over a much longer term (typically 15-25 years in remaining mortgage term), which can mean more total interest paid even at a lower rate. For smaller amounts (under £15,000-£20,000) that you could repay quickly, a personal loan may result in less total interest. Run both scenarios with the actual numbers before deciding.
The amount depends on your available equity and the lender's maximum LTV. If your home is worth £350,000 and you owe £200,000, you have £150,000 equity. If the lender allows a maximum of 80% LTV, the maximum total mortgage would be £280,000 - so you could potentially release up to £80,000. In practice, lenders also assess affordability of the increased mortgage repayment, which may limit the actual amount offered.
Planning permission is generally not required from the mortgage lender at the application stage - they lend against the current property value, not the value post-improvement. Planning permission is a matter for the local authority, not the mortgage lender. However, if improvements require planning consent, you should obtain it before starting the work. Some lenders may ask about the purpose of funds if large additional borrowing, but this is not a substitute for proper planning compliance.
No - future potential value increase from planned improvements does not count toward your eligibility calculation now. The mortgage is based on the current property value. The benefit of value-adding improvements (such as a well-executed extension) is that future LTV calculations at your next remortgage may be more favourable, potentially giving access to better rates at that point.
A second charge loan may be preferable if your existing mortgage has significant early repayment charges that would make remortgaging now expensive. It keeps your existing deal intact while providing the additional funds. See our comparison of second charge mortgages for detail. If your ERC period is nearing its end, waiting and then remortgaging may be the better outcome overall.
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