How to Finance a Loft Conversion in the UK?

A loft conversion is one of the best home improvements you can make but it can cost you anything between £22,000 and £95,000 depending on the type and size of the project. Most homeowners don’t have that much amount sitting in a current account ready to go so understanding your finance options before you get quotes is really helpful.

This guide will walk you through every realistic way to fund a loft conversion in the UK in 2026, what each option actually costs you and which one tends to suit each type of homeowner.

Using Your Savings

The easiest choice and the one that will cost you least over the long term. If you have savings to cover the full cost of the conversion you will avoid interest payments altogether and keep the project simple.

The biggest thing to be cautious about is not gutting your emergency fund. Most financial advisors say you should have between three and six months’ worth of household expenses on hand, no matter what you’re doing with your money otherwise. A loft conversion is a good investment but shouldn’t leave you financially exposed should something else go wrong during or after the build.

If your savings can cover part of the cost, but not all, a combination works well. Use savings to the highest possible amount and borrow only the shortfall. Whichever route you take, this will reduce the amount of interest you pay over the life of the loan.

Remortgaging

In the UK, remortgaging is the most popular way to fund a larger loft conversion project. It’s where you switch your existing mortgage for a new deal and borrow some extra cash at the same time. The extra money is paid out to cover the conversion cost and the total borrowing is combined into one monthly payment.

The main advantage is that mortgage interest rates are typically lower than personal loan or credit card rates, making remortgaging a cost effective way to borrow larger amounts. Repayments are spread out over the remainder of the mortgage term, so even on a large project the monthly payments remain affordable.

You will need to check whether your current mortgage has early repayment charges that would be payable should you switch now. If you are in the middle of a fixed rate deal sometimes the early repayment charge can outweigh the benefit of remortgaging straight away. If this is the case it is often worth waiting until the end of the fixed rate period before you switch.

You’ll also need to have enough equity in your home. Most lenders will want you to retain 10 to 25 percent equity in the property after you borrow more. A value adding loft conversion can actually improve your loan to value ratio which helps with remortgage affordability.

Remortgaging typically takes 4 to 6 weeks to arrange. If you are working to a specific project start date factor this in when planning your timeline.

Further Advance from Your Existing Lender

If you don’t want to remortgage or if early repayment charges make switching lenders unattractive then a further advance is worth considering. This means you borrow more money from your current mortgage lender on top of your existing mortgage rather than switching to a new deal all together.

The benefit is that you avoid having to go through a full remortgage process and you avoid any early repayment charges on your current deal. The interest rate on the further advance may be different from your main mortgage rate so check this carefully before you agree to anything.

Lenders typically require a minimum of 6 to 12 months of mortgage payments before they will consider giving you another loan. If you’ve just bought the property, you may need to wait for this option to become available to you.

Secured Loan

A secured loan is a new loan that is taken out in addition to your existing mortgage. When you borrow against the equity in the property, you place a second charge on the property. Lenders are usually willing to lend larger amounts at lower interest rates when the loan is secured against your home than with unsecured lending.

The term of a secured loan is generally between 5 and 25 years. Applying is much quicker than remortgaging and is usually between 2 to 4 weeks which can be useful if you need to pin down a builder or meet a project start date.

The main risk when you take out a secured loan is that you could lose your home if you can’t make your repayments. And this also applies to further advances and remortgages. Before you sign up for any secured borrowing, you should make sure that the monthly repayments are something you can genuinely afford within your household budget.

Personal Loans

If you want to borrow without putting your property up as security, or for smaller loft conversions, then an unsecured personal loan is a good option. Most mainstream lenders offer personal loans of between £25,000 and £50,000 with set repayment terms of between 1 and 7 years.

The most important advantage is speed. Personal loans may be approved and funded within days, not weeks. They also don’t need a charge on your property, so your home isn’t at direct risk if you get into financial difficulty, although missed payments will still damage your credit rating.

The trade off is the price. Unsecured personal loans tend to have higher interest rates than secured borrowing. Rates can vary widely between lenders. The best interest rates tend to be offered to borrowers with good credit histories. If your credit score is not perfect then expect to either pay a higher rate or have fewer options to borrow.

The best type of loan for Velux or smaller dormer conversions with total project costs in the range of £25,000 to £40,000 is a personal loan.

%0 Credit Cards

This option is worth considering for small amounts or for covering specific costs within a larger project. Some credit cards offer a 0% interest rate on purchases for the first 12 to 24 months. If you can pay it off in that time, you’re basically borrowing for free.

The limitations are clear. Credit limits are rarely high enough to cover an entire loft conversion and the interest rate that kicks in after the 0% period is normally very high. “Credit cards are best used as a supplementary tool to cover finishing costs, fixtures or smaller bills rather than the main funding vehicle for a project of this size.”

Equity Release

Home equity release for the over 55s enables you to use the cash in your home without having to sell up or make monthly repayments. Eventually, at the sale of the property, the loan plus rolled-up interest is repaid.

It can be a handy option for older homeowners who want to fund a loft conversion without taking on new monthly payments. The obvious downside is that rolled up interest compounds over time and this reduces the equity left in the property for beneficiaries. Anyone thinking about equity release should seek independent financial advice before proceeding.

Grants for Loft Conversions

Loft conversion grants are not as common as you might think, but they do exist in some circumstances. Where a loft conversion includes energy saving measures such as insulation upgrades that meet government standards some home owners may be able to access funding through the Great British Insulation Scheme or the ECO4 scheme. These schemes are mainly aimed at lower income households or properties with poor energy efficiency ratings.

These programs are subject to frequent updates for availability and eligibility. Don’t assume you’re eligible, check current eligibility on GOV.UK. If the main aim is to create extra living space rather than improve energy efficiency then a loft conversion will not qualify for grant funding.

Which finance option works for you?

There is no one-size-fits-all answer as it depends on how much you need to borrow, how much equity you have in your property, your current mortgage situation and what monthly repayments you can comfortably afford.

Generally speaking:

If your project costs between £25,000 and £40,000 and you have a good credit record a personal loan is often the quickest and simplest route.

For projects costing £45,000 or more, where you have good equity in your property, remortgaging or a further advance with your existing lender will generally be the most cost effective option.

If you are in the middle of a fixed rate mortgage deal with early repayment charges then a secured loan alongside your current mortgage may be a more financially sensible option than remortgaging.

If you are aged 55 or over and have significant equity in your property equity release is worth exploring with an independent financial adviser.

Always seek independent financial advice before committing to any borrowing secured against your property whatever route you choose. The monthly repayment figures are only part of the story. The true cost of financing your conversion is the total cost of repayment over the entire term of the loan.

How much to budget for?

It is worthwhile getting a realistic idea of what your specific project is going to cost before you look at finance options. UK loft conversion costs (2026) vary from around £22,000 for a basic Velux conversion to £95,000+ for a full mansard build and a rear dormer comes in between.

Our free loft conversion cost calculator gives you an indicative price range based on your conversion type, property type & location. Use that figure as the basis for your finance planning before you approach lenders.