Secured Loan or Remortgage for Home Improvements?

Remortgaging for Home Improvements: How It Works

When you remortgage to fund home improvements, you replace your current mortgage with a new, larger one — either with the same lender (a product transfer plus further advance) or with a new lender. The new mortgage covers both your existing outstanding balance and the additional sum you need for the improvements. You receive the difference between the new and old mortgage amounts as a lump sum at completion, which you then use to fund the work.

The advantage of remortgaging is simplicity: one lender, one monthly payment, one rate. If you are currently on your lender's standard variable rate (SVR) or are coming to the end of a fixed rate, this is also an excellent opportunity to lock into a new competitive fixed rate on your entire borrowing, potentially reducing your overall monthly mortgage payment even while raising extra funds.

The disadvantage is that you are refinancing the entire mortgage balance, not just the new money. If your existing mortgage has an early repayment charge (ERC) — typically 1% to 5% of the outstanding balance, charged during a fixed period — remortgaging before the fix ends can cost thousands of pounds in exit penalties. On a £200,000 mortgage with a 2% ERC, that is £4,000 in penalties alone. Additionally, if your existing rate is very low (as many fixed in 2020 to 2022 are), you would be rolling that cheap debt into a new, more expensive rate, increasing your overall monthly cost significantly.

Remortgaging also requires full underwriting as if it were a new mortgage application. Changes in your income, employment, or credit file since the original mortgage can affect whether you qualify at the best rates or at all. With lending criteria tighter in 2024 and 2025 than they were a few years ago, this is worth checking before committing to the remortgage route.

A Secured Loan for Home Improvements: When It Makes More Sense

A secured loan leaves your existing mortgage completely untouched. Your existing rate, your existing lender, and your existing payment continue exactly as before. The secured loan adds a second monthly payment — to the second charge lender — but the total cost of your existing mortgage debt does not increase because you have not refinanced it.

This is the critical advantage for homeowners who are mid-way through a low fixed rate. If you fixed at 1.9% for five years in 2021 and have two years remaining, remortgaging would mean trading that 1.9% rate on your full outstanding balance for a rate of perhaps 4.5% to 5%, in addition to paying the ERC. A secured loan at, say, 9% on the improvement funds only might be more expensive on the new money in isolation, but if it avoids refinancing £200,000 of existing mortgage debt from 1.9% to 4.5%, the total saving across all your borrowing is very significant.

Secured loans are also useful where the additional borrowing needed is relatively small in comparison to the existing mortgage. If you need £20,000 for a bathroom renovation and have a £300,000 mortgage, the cost and disruption of remortgaging for £20,000 — legal fees, new valuation, potentially a new broker fee — may outweigh any rate saving. A secured loan for the £20,000 alone may be simpler and comparable in total cost once transaction costs are included.

The secured loan route does require you to manage two separate monthly payments to two different lenders. It also means two sets of lender criteria to satisfy. Some borrowers find this more complex to manage, but financially it is straightforward: two separate, transparent products each doing a defined job.

Comparing Total Cost: A Practical Example

Consider a homeowner with a £220,000 mortgage at 1.95% fixed with two years remaining (ERC of 2%, so £4,400 to exit early), and £30,000 needed for a kitchen extension. Monthly mortgage payment: approximately £990 on a 25-year repayment mortgage.

Option A — Remortgage now: Exit existing fix (£4,400 ERC), take new mortgage of £250,000 at 4.8% over 23 years (remaining term). New monthly payment: approximately £1,490. Increase in monthly payment: £500 per month. Additional interest cost on the existing £220,000 balance by paying 4.8% instead of 1.95% for the next two years: roughly £6,270. Total additional cost versus waiting: approximately £10,670 plus arrangement fees.

Option B — Secured loan of £30,000: Existing mortgage continues unchanged at 1.95%. Secured loan at 9% over 7 years: monthly payment approximately £480. Additional monthly cost: £480. Total interest on secured loan: approximately £10,000. In this case, the secured loan adds £10,000 in interest but avoids the £10,670 in additional mortgage cost plus the £4,400 ERC. Total saving over the two-year period: approximately £5,000 or more, net of the secured loan interest, plus you retain the low mortgage rate for the remainder of the fix.

This is a simplified illustration, but it demonstrates why many financial advisers and mortgage brokers recommend secured loans for homeowners mid-fix. The arithmetic changes dramatically once the fixed period ends and the homeowner is on the SVR — at that point, remortgaging for the combined amount is usually the cheaper route. Timing your additional borrowing around your mortgage rate cycle is one of the most impactful financial decisions you can make as a homeowner.

Costs, Fees, and What to Ask Your Broker

Both remortgaging and secured loans carry costs beyond the headline interest rate. For remortgaging, the typical costs include a product arrangement fee (£500 to £1,500 from most lenders), a valuation fee (£300 to £500 for a standard residential property), legal fees (£500 to £1,000 for a solicitor acting on behalf of both lender and borrower in most cases), and potentially a broker fee. If switching lenders, the legal work is more involved. The ERC on the existing mortgage is the largest potential cost and must be factored into any comparison.

For a secured loan, costs typically include a lender arrangement fee (£250 to £750 for most products), a valuation fee, and legal costs for registering the second charge. Some brokers charge a fee expressed as a percentage of the loan amount — typically 5% to 8% — which can be added to the loan and repaid over the term. Fee-free broker services are also available and worth seeking out, as the broker fee represents a meaningful cost on smaller loans.

When speaking to a broker, ask them to model both options side by side using the same assumptions: same loan term, same start date, and including all fees. The output should show you the monthly payment for each option, the total amount repayable, and the net saving or cost differential. A good broker will do this without prompting; if they push one option without comparison evidence, ask for the numbers.