A builder’s quote lands at £45,000 and your savings stop at £15,000, so how do you pay for the rest? The right home improvement finance in the UK depends on how much you need, how long you want to repay it, and how much risk you are willing to put on your house. This guide compares the main routes so you can match the borrowing to the job.
The short answer: borrow the smallest amount for the shortest time you can afford, and secure it against your home only when the sum and the term justify it. Under about £25,000 an unsecured loan or a 0% card is usually simpler; above that, remortgaging or a further advance is usually cheaper per pound borrowed. Always look at the total repaid, not just the monthly payment.
Start with what the job is worth
Before comparing products, decide whether the work earns its keep. A new boiler or a roof repair is a necessity; a kitchen is a choice that may or may not lift your sale price. Our guide to improvements that add value is worth reading before you commit to borrowing for something that will not pay you back.
Then work out your real budget: the quote, plus a contingency of 10 to 15% for older properties, plus any costs the quote excludes such as planning fees, building control, skip hire and redecoration.
Option 1: Savings
It is the cheapest money you will ever use, because there is no interest. Keep an emergency fund of three to six months of outgoings untouched, and treat the rest as available. If the savings pay for the necessary part of the job and borrowing covers the optional extras, you keep the debt small.
Option 2: Unsecured personal loan
A personal loan gives you a fixed sum, a fixed rate and a fixed term, usually between one and ten years. Your house is not at risk if you cannot repay, though missed payments will damage your credit file and can lead to court action.
Best for: £5,000 to about £25,000, a clear budget and a fast start.
Watch for: the advertised rate is often only available to the best credit profiles, so check the representative APR and what you would actually be offered.
Cost check: a loan at a higher rate over five years costs far more than the headline monthly figure suggests. Multiply the monthly payment by the number of months to see the total.
Option 3: 0% purchase credit card
A 0% purchase card lets you spread the cost interest-free for a set number of months. It suits a modest job you can clear within the interest-free period, and it can add some consumer protection under Section 75 of the Consumer Credit Act for purchases between £100 and £30,000 where the supplier is at fault.
Best for: £1,000 to about £10,000 you can clear in the 0% window.
Watch for: the rate jumps once the offer ends, and your limit is rarely large enough for a whole extension.
Do not take a cash advance, which is charged interest straight away.
Option 4: Remortgaging
If your fixed deal is ending anyway, a remortgage lets you borrow more at mortgage rates, which are normally lower than loan rates because the debt is secured on your home. Spread over a 20 or 25 year term, the monthly cost is low, but so is the pace at which you clear it.
Best for: £25,000 and over, when your current deal is ending or you can switch without a large early repayment charge.
Watch for: early repayment charges on your current deal, arrangement fees, valuation and legal costs, and the fact that you will pay interest on the improvement for decades unless you overpay.
Risk: the debt is secured on your house. Falling behind with payments can put the property at risk.
Option 5: Further advance from your current lender
A further advance is extra borrowing added to your existing mortgage without replacing it. It can be quicker and cheaper to arrange than a full remortgage, and it avoids an early repayment charge on your main deal. It is often priced at the lender’s current rate for new borrowing rather than your existing rate, so compare the blended cost. Not every lender offers one.
Option 6: Secured loan or second charge
A second charge loan sits behind your mortgage. It can suit someone who cannot or does not want to touch a cheap fixed-rate mortgage. The rates and fees are usually higher than a main mortgage, and the secured nature of the debt means the stakes are higher too. Take advice before using one.
Compare them side by side
Route
Typical sum
Secured on home?
Main risk
Savings
Whatever you hold
No
Leaves you without a safety net
Personal loan
£5,000 to £25,000
No
Higher rate, short term
0% purchase card
Up to your limit
No
Rate jumps after the offer
Remortgage
£25,000 and over
Yes
Fees and long-term interest
Further advance
£10,000 and over
Yes
Lender-set rate, not always offered
Second charge
£10,000 and over
Yes
Higher cost, extra charge on the home
My view: if the job is a necessity and the sum is large, a remortgage or further advance is normally the right tool, but only if you overpay to clear the improvement debt far faster than the term. Never put a short-lived project on a 25 year debt and forget about it. A kitchen you will have replaced in 15 years should not still be on your mortgage in 25.
A worked example
Suppose you need £30,000 for a rear extension fit-out. Over five years, an unsecured loan at a higher rate means a high monthly payment but the debt is gone quickly. The same sum added to a mortgage over 25 years costs far less each month, yet the total interest can be a multiple of the loan figure unless you overpay. Neither is right for everyone: the loan suits someone with spare monthly income who hates long-term debt, while the mortgage suits someone whose budget is tight but who plans to overpay when bonuses or savings arrive. Ask each lender for the total amount repayable on the same sum and term so you compare like with like.
Mistakes that cost homeowners money
Borrowing the quote and nothing more. Unforeseen work is common on older homes, so build in a buffer before you apply, not after.
Choosing by monthly payment alone. A longer term lowers the payment and raises the total cost.
Paying a large deposit from borrowed money. Hold back payment until work is done to a stage you can inspect.
Ignoring fees. Arrangement, valuation and legal fees on a remortgage can add hundreds of pounds.
Forgetting tax and planning costs. Some projects need professional fees before a brick is laid.
Protect your position while you borrow
Lenders look at your income, your outgoings and your credit file, not your plans. Get a copy of your credit report before you apply so you can correct errors, and avoid several full applications in a short window, because each leaves a footprint. Many brokers and lenders offer a soft-search eligibility check that does not affect your score.
Tell your lender what you are doing if the works are structural, since some mortgage terms require consent, and tell your insurer about renovations too, because a significant project can change your cover.
Pay in stages tied to the work completed rather than handing everything over up front. A staged payment schedule also helps you draw down borrowing only as you need it.
What to do in the next 30 minutes
Write down the full cost of the job, including a 10 to 15% contingency.
Check when your current mortgage deal ends and what the early repayment charge would be.
Get a free copy of your credit report from one of the credit reference agencies.
Run two soft-search quotes: one personal loan, one mortgage product.
Ask your lender whether a further advance is available and at what rate.
When you have chosen, track your project spend in Home+: the quote, the stage payments and the receipts in one free place, so you can see what the work has cost against what you borrowed.
FAQ
Is it better to remortgage or take out a loan for home improvements? For larger sums over a long term, remortgaging is usually cheaper per month, but you pay interest for longer and put your home on the line. For smaller sums you can clear in a few years, an unsecured loan avoids fees and keeps your mortgage untouched.
Can I use a 0% credit card to pay a builder? Yes if the builder accepts cards, but many do not, or add a surcharge. Your limit may also be too low for a large job. Only use it for what you can clear before the interest-free period ends.
Do I need to tell my mortgage lender about the works? Often yes for structural changes such as an extension or loft conversion, because they affect the property that secures your loan. Check your mortgage terms or ask your lender before work starts.
Will home improvements raise my borrowing costs? Not directly. A better valuation can improve your loan-to-value ratio at your next remortgage, which may open up cheaper rates.
What if I cannot repay a loan secured on my home? Contact your lender early. They have duties to treat you fairly and can discuss options. In the worst case, a lender can take possession of the property, which is why secured borrowing needs more caution.
