How To Finance a House Extension – What is The Best Method? .

Discover how Hank Zarihs Associates has helped clients secure tailored financial solutions for property investments and developments. From urgent bridging loans to large-scale development financing, our case studies highlight success stories that showcase speed, expertise, and client-focused outcomes.

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Best ways to finance a house extension in london scaled 1

Whether you’re a property investor or simply a residential homeowner, one of the quickest and easiest ways to add value to your property. 

Extension can be something of a broad or vague term, and could apply to extending your kitchen, for example, or to converting your loft into an extra floor. It could also mean building out into your garden or on to existing features on the property. 

As the property market is booming, we’ve noticed that we’re receiving more enquiries than ever about how to finance a house extension, and so we’ve decided to put together a short guide to let you know what options you may have for funding this type of project. 

Ultimately, building a house extension is rarely cheap, especially if you want it done well. There are the caveats, of course, that you should always go through a reputable tradesman when looking to fund these types of projects and not try to do things on the cheap, as it’s often found that this can cost more in the long run and even reduce the value of your property. 

When an extension is done well, however, and is well researched and adds to the property, there are few things you can do that have such an immediate impact and are well worth the investment, even if the initial outlay can be pricey. 

Here are some ways to consider if you’re looking to finance a house extension. 

5 Best way to pay for a house extension

The best way for you to finance your extension will depend on your circumstances, the cost of the project, your experience and whether you’re a property investor or a residential property owner. 

We deal with clients in all of these situations and more, so we know that advice can be key, but here are five finance methods to consider. 

Re-mortgage your property

Short term mortgages to finance extensions 600x450 1One option is to release equity that you have in your property over the period of time that you’ve owned it, or if your property has increased in value. 

It’s one of the most popular ways for clients to raise capital to fund these projects and can be particularly attractive if your property has increased in value over the course of your mortgage.

A downside can be that it increases your monthly mortgage payments and so can stretch your household budget. That being said, mortgage rates are at an all-time low, and so if you can agree a low interest re-mortgage on a fixed rate either as a residential customer or a Buy-To-Let customer. 

The process for remortgaging will differ depending on whether you’re a residential customer or landlord and it may be a little more difficult if you’re a landlord, but it’s something we can help with. 

Take out an unsecured loan

This is a similar option to using a credit card, and it carries similar risks and downsides. One significant difference, however, is that interest rates on unsecured loans tend to be much lower interest rates than using credit cards. 

Further to that, the interest and payments are fixed, meaning that you know what you’ll be paying each month when funding the extension to your house. The fact it’s unsecured is also attractive as, should the worst happen, and you’re not able to make the repayments the lender isn’t able to repossess your house, which isn’t the case with a re-mortgage. 

A second mortgage

A second mortgage, or a ‘second charge’ mortgage is sometimes known as a secured loan too, and it essentially means that you’re raising financing to fund your extension against your property. 

Your main mortgage provider are the financial provider that have ‘first charge’ over your property, so if you fail to make the payments on your mortgage they have the right to the asset first, but second charge providers will lend you money on the understanding they then have second priority if the worst were to happen. 

These are a little more difficult to negotiate and the interest can be higher, but it can be a good solution if you’re looking to extend your house. 

Use your savings

This may be something you’ve already considered if you’ve got enough in savings to cover the cost of the extension project, however, you may be reticent to part with so much money out of your savings rather than taking our financing. 

It’s true that paying cash out of your savings can feel like a risk, but don’t forget how much you’re saving in the long run by not paying interest on the capital you’re investing into the house. And that’s how it should ultimately be viewed – as an investment. 

By investing into your house, you’re then increasing the value and how easy it is to sell on the open market. 

Use a credit card

This very much depends on your credit card limit and the interest you pay, but if you’re looking at funding a smaller scale project such as a kitchen extension and you have enough on your credit card to cover the amount, then it may be something worth considering. 

What we would say is that this will only suit in fairly specific circumstances. What to be cautious of is using up all your available credit as most creditors and credit reference agencies view credit utilisation of more than 50% as a bad sign that you’re not managing your credit well. 

Further to that, if your interest rate is high it could become very expensive and negate the benefits of increasing the property value. 

What if it’s property investment?

As a property investor you can still raise finance for your property, it just be a slightly different process as a landlord or investor. As more of a business customer, financing providers will usually ask for a bit more detail about your plan, how long it will take and how much you think it will increase the value of the property by. 

They’ll also usually look to see what your ‘exit plan’ is, or how you aim to repay the loan, as well as some asking for a business plan to show that you know what you’re doing. Here are some popular options for property investors. 

Bridging loan

A residential bridging loan is short term option for raising quick capital and is used for a variety of reasons in property development and refurbishment. 

Bridging facility can be used to finance house improvements 600x450 1If, for example, you’re looking to fund an extension on a house that you’ve just bought before re-mortgaging or selling, then a bridging loan is an excellent choice as it’s flexible and relatively straight forward to organise. 

If it’s a shorter term project that you can repay upon completion, then this makes good sense. 

Heavy refurbishment

Many of our clients take out this type of property finance when they’re looking to fund the purchase of a bargain property that needs a lot of structural work doing to it or needs a lot of refurbishment. 

Again, it’s intended as a shorter term arrangement, and many of our clients use these types of property loans to refurbish a property before they then arrange a mortgage or sell the property on. 

Many mortgage providers won’t agree a Buy-To-Let mortgage or longer term lending if a property isn’t in a good state of repair, and these circumstances many of our clients approach us to arrange shorter term financial arrangements to complete the work. 

Second charge or second mortgage

As described above, a second mortgage can be a great way to fund extensions if you’re looking to raise capital, but your main mortgage provider won’t consider a re-mortgage. 

A ‘second charge’ mortgage simply means that you’re using your property as security against the loan, but the provider gets second priority if the worst happens. 

Again, these can be tricky to arrange and there are some circumstances you may not be considered for, however, our team of brokers have decades of experience in the market and will be able to advise you of the best route and what you’re likely to qualify for. 

Speak to our team about how to finance a house extension

Our team of brokers have years of experience dealing with extensions and funding them. They know our panel of lenders inside our and what you’ll need to be able to qualify for our range of products. 

They’re all friendly and available to field your questions, no matter what you want to know, so why not give them a call today to discuss what you’re looking for? 

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Shiraz Khan
Stay informed with the latest news, market trends, and expert guidance on bridging loans, development finance, and UK real estate investment. Our blog is here to support your property journey with clear, practical advice.
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Frequently Asked Questions

You may have heard about bridging loans in the context of property investment or moving house, but what exactly are they? Basically, bridging finance is a type of short-term loan that allows a buyer to purchase a property before their existing home or investment property is sold. As the name suggests, it ‘bridges’ the funding gap in the lag between purchase and sale – offering rapid access to the necessary purchase funds for a brief period of time.

Borrowers can access from £5,000 to £250 million, depending on applicant status, the value of the property and other lender criteria. Higher lending amounts are typically reserved for borrowers who can put up several properties as security. Quotes are provided on a Loan to Value (LTV) of 65%-80% in most situations.

Bridging loans can be used in a number of situations. For example:

  1. When people are moving home in a chain, with a gap between completion dates (e.g. needing to pay for the new property before receiving funds on the completed old property).
  2. When property investors or private buyers renovate a home and want a rapid sell-on.
  3. When an individual is looking to buy a property at an auction.
  4. When property investors and developers are looking to pay a tax bill
  5. When buyers want to secure finance against an uninhabitable property.

This type of finance can be used by homeowners, landlords and property developers alike.

The bridging finance market has grown rapidly, with a number of small and focused lenders now on the market, catering for specialist property finance needs. The market has changed because large high-street lenders have become less willing (and sometimes less able) to lend ever since the financial crisis of 2008.

As to whether a bridging loan for property development, auction purchase or private home buying is a good idea, it depends on a variety of factors. Bridging loan requirements vary by lender, but each will have certain common features that need to be considered.

The most notable feature of this type of finance is that the interest rate is likely to be high. At the same time, there are typically high administration fees applied to the loan. Because of this, it is essential to proceed very carefully and with a full view of the facts. Borrowers have been burned by this type of loan in the past, in instances where transactions have fallen through, or where lenders have turned out to be unscrupulous and untrustworthy.

Benefits of instant bridging loans

1. Rapid access to money
2. Ability to borrow large sums – often up to £250 million depending on applicant status
3. Options for flexible borrowing.

Possible downsides of bridging loans:

1. Failure to understand the unique features of these loans can result in financial risk
2. Bridging finance is secured against your property; meaning it can be sold if you can’t meet the repayment terms
3. A costly option with fees and higher interest

Bridging finance interest rates will vary by lender. However, interest costs of 1.5% a month are not unusual, which can equate to an annual percentage rate of 18%.

Bridging loans may have fixed or variable interest rate features. Fixed interest rates are ideal for customers who want stability, as they offer the same amount of interest for the duration of the term. The rate is pre-agreed, but there may be a premium for this security.

The other choice is to have a variable rate bridging loan which can change with the base rate. However, you can save money if the base rate decreases. Borrowers who are less concerned about security sometimes prefer the variable rate option if they believe that the financial markets will travel in their favour. Knowledge and market insight is required here, along with a thorough understanding of personal risk tolerance. If interest rates appear to be rising, most customers will choose the fixed interest rate to lock it in and avoid further increases in the event of a base rate rise.

Bridging loan periods tend to be for several months and there are usually different options for paying the interest portion.

Monthly repayments

The customer repays the interest every month as a separate payment, rather than adding it to the outstanding balance

Rolled-up bridging finance deals

The compound interest is calculated monthly but added to the outstanding loan balance and paid together when repayment is due.

Retained interest

The monthly interest payment due is covered up to a predefined date so that the full sum is only repaid when monies are due.

As well as interest payments, there will be an arrangement fee for the set-up of the bridging loan, which is usually around 1-2%. A repayment fee for exit paperwork may also apply, along with valuation fees for the cost of the surveyor.

Remember, this type of finance is designed to be short-term. As soon as it extends beyond the agreed interim or bridging period, penalties can rapidly stack up. Typically, bridging finance is available for 1 – 18 months.

Yes, there are two broad types: closed bridging finance and open bridging finance.

With closed bridging finance you will tell the lender how you will repay the loan – with what funds and when. These loans usually complete within a few months and the clear exit plan is required as a lending condition.

Open bridge finance won’t usually need this type of exit plan, and it is typically the loan of choice when funds are needed urgently to complete a property transaction. No detailed plan is needed to explain how the debt will be settled, and the finance tends to be offered for up to a year. Of course, it’s important to note that interest will keep being applied throughout this period.

There are also first charge bridging loans and second charge bridging loans.

If you have a loan against a property which is already mortgaged, you’d take out a second charge loan. An example of this would be if you were planning to finance a property extension to improve the property. The categorisation tells the lenders who will have legal priority for repayment if the loan was unable to be paid off at the term-end.

First charge loans apply if the new loan is the first secured on the property.

Bridging loan requirements will depend on the lender. Often, lenders will require that:

Customers must also take out their property mortgage with them too, providing the bridge finance as an interim measure before the standard mortgage comes into play.

Property is put forward as security against the loan. Some lenders expect applicants to have more than one property in order to be eligible for their bridging finance products, but this will depend on the lender and the size of the loan.

Applicants show proof of income – although, interestingly, as loan interest isn’t repaid monthly, some lenders do not request this.

The applicant shows evidence of their property investment track record if they are planning to develop their purchased property.

The applicant can show a business plan if they are using the bridging loan for commercial purposes.

Development loans are another type of short-term property development loan. They are repaid in stages and calculated on the gross value of the development. Personal loans are another option, as are remortgages when timescales are more flexible and a long-term loan is desirable.

Use a bridge loan calculator
Ask for your lender to provide a tailored bridge finance example or illustration around your particular borrowing needs.
Think carefully about the type of bridging loan that you need – whether open bridge finance or closed bridge finance.
Know whether the loan is a first or second charge type.
Clarify whether the interest rate is fixed or variable.
Review products from several lenders.
Be clear on your security.
Read the small print!

Bridging loans are offered by banks, building societies, specialist lenders and brokers. They aren’t widely advertised and usually require a direct application by the customer to find out the product features and offers.

Once you have made an application, a decision will usually be made within 24 hours. The funds then will take around two weeks to be issued, including time for checks to be carried out, the valuation and the actual transfer.

Hank Zarihs are highly experienced and specialist financial intermediaries operating in the property development market. We work with a tried and tested panel of over 60 trusted lenders and can provide excellent bridging finance with attractive features. Contact us to find out more.

Shiraz Khan

Shiraz Khan linkden

Managing Director

Shiraz Khan is the author of the content. Shiraz is the managing director and founder of Hank Zarihs Associates. With over 16 years’ of experience we are master brokers within the short term financing industry. We specialise in a wide variety of short term loans.

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