First Time Buyer Mistakes to Avoid When Getting a Mortgage

Buying your first home is one of the most exciting milestones in life, but the mortgage process can also be one of the most daunting. With so many decisions to make — from how much to borrow to which lender to choose — it is easy to make costly mistakes that could affect your application, your finances, or both.

At Option Finance, we have helped thousands of first-time buyers navigate the mortgage process successfully. In this guide, we share the most common mistakes we see and, more importantly, how to avoid them.

Not checking your credit report before applying

One of the most common mistakes first-time buyers make is applying for a mortgage without first checking their credit report. Your credit history plays a significant role in whether lenders will approve your application and what interest rates they will offer you.

Why this matters:

• Errors on your credit file can lead to an application being declined — and each declined application leaves a footprint that can make future applications even harder
• You might have old debts, incorrect addresses, or financial links to other people that you did not know about
• Understanding your credit score in advance allows you to take steps to improve it before applying

How to avoid it:

• Check your credit report with all three major UK credit reference agencies — Experian, Equifax, and TransUnion — at least three to six months before you plan to apply
• Dispute any errors and wait for them to be corrected
• Register on the electoral roll at your current address, as this significantly improves your credit score
• Pay down outstanding debts where possible, and avoid taking on new credit in the months before your application
• Do not apply for multiple credit products in a short period, as this generates multiple hard searches on your file

If you have had credit difficulties in the past, such as missed payments, defaults, or CCJs, do not assume you cannot get a mortgage. Speak to a broker who specialises in adverse credit mortgages — there are lenders who will consider your application. Use our bad credit mortgage calculator to see what you might realistically borrow with credit issues.

Only looking at the interest rate

When comparing mortgage products, many first-time buyers focus solely on the interest rate and overlook the total cost of the mortgage. The headline rate is important, but it is not the only factor that determines how much you will actually pay.

Costs to consider beyond the interest rate:

• Arrangement fees — some mortgages with the lowest interest rates carry high arrangement fees of £1,000 to £2,000 or more. Adding this fee to the mortgage means you pay interest on it for the full term
• Valuation fees — some lenders charge for the property valuation, while others include it free of charge
• Early repayment charges (ERCs) — if you need to repay the mortgage early (for example, to move home), ERCs can be substantial, often 2% to 5% of the outstanding balance
• Standard variable rate (SVR) — when your fixed or tracker rate ends, you will be moved to the lender’s SVR, which is usually much higher. Make sure you plan to remortgage before this happens

How to avoid it:

• Compare the total cost of the mortgage over the initial product period, including fees, not just the monthly payment
• Use our mortgage calculator to model different scenarios and see how fees affect the total cost
• Ask your broker to show you the total cost comparison, so you can see which product genuinely offers the best value

Borrowing the maximum amount offered

Just because a lender offers you a certain amount does not mean you should borrow it all. Lenders assess affordability based on their criteria, but they do not know your full financial picture — your lifestyle, future plans, or spending habits.

Why this is risky:

• Stretching yourself to the maximum leaves no financial cushion for unexpected costs — boiler breakdowns, roof repairs, or changes in circumstances such as redundancy or starting a family
• Higher borrowing means higher monthly payments, which can cause stress and restrict your ability to save
• Interest rate rises can significantly increase payments on larger mortgages, particularly if you are on a variable or tracker rate

How to avoid it:

• Use our affordability calculator to get a realistic picture of what you can comfortably afford
• Factor in all the costs of homeownership, not just the mortgage payment — council tax, insurance, maintenance, utility bills, and any service charges or ground rent
• Leave yourself a buffer for unexpected expenses and potential interest rate increases
• Consider whether your income is likely to change in the coming years — if you plan to reduce your hours, change careers, or take parental leave, factor this in

Not getting an agreement in principle early enough

An agreement in principle (AIP), also known as a decision in principle or mortgage in principle, is a statement from a lender confirming how much they would be willing to lend you, subject to a full application and property valuation.

Why this matters:

• Without an AIP, estate agents may not take your offers seriously, particularly in competitive markets
• An AIP gives you a clear budget, so you do not waste time viewing properties you cannot afford
• It identifies any potential problems with your application early, giving you time to address them

How to avoid it:

• Get an AIP before you start seriously looking at properties — ideally at the very beginning of your home search
• An AIP typically lasts 60 to 90 days, so time it appropriately
• Getting an AIP does not commit you to that lender — you can still shop around for the best deal when you find a property

Ignoring first-time buyer stamp duty relief

First-time buyers in England and Northern Ireland benefit from significant stamp duty relief, and failing to account for this properly can lead to overpaying or budgeting incorrectly.

Current first-time buyer stamp duty rates:

• 0% on the first £300,000 of the purchase price
• 5% on the portion between £300,000 and £500,000
• If the property costs more than £500,000, you pay the standard rates with no first-time buyer relief

This means a first-time buyer purchasing a property for £300,000 or less pays no stamp duty at all. On a £400,000 property, you would pay £5,000 (5% on the £100,000 above £300,000), compared to £10,000 for a non-first-time buyer.

Use our stamp duty calculator to see exactly what you would pay.

How to avoid mistakes:

• Make sure your solicitor applies the first-time buyer relief correctly on your stamp duty return
• If you are buying with a partner who already owns property, you may not qualify for the relief — check the rules carefully
• Budget for stamp duty as part of your overall purchase costs

Not considering all the upfront costs

The deposit and stamp duty are the most obvious costs, but first-time buyers are often caught off guard by the full range of expenses involved in buying a home.

Costs many first-time buyers overlook:

• Solicitor or conveyancer fees — typically £1,000 to £2,000 plus VAT and disbursements (searches, Land Registry fees, etc.)
• Survey costs — a homebuyer’s report or building survey costs between £400 and £1,500 depending on the property type and level of detail. A basic mortgage valuation (which some lenders charge for) is not the same as a survey
• Mortgage broker fees — some brokers charge a fee for their services, though at Option Finance we aim to make the process as transparent as possible
• Moving costs — removal company, van hire, mail redirection, and new furniture
• Immediate repairs or improvements — many first-time buyers need to spend money on the property shortly after moving in

How to avoid it:

• Create a detailed budget that includes all purchase costs, not just the deposit
• Set aside a contingency fund of at least £2,000 to £3,000 for unexpected expenses
• Ask your broker and solicitor for a full breakdown of expected costs before you commit

Making changes to your finances during the application

Once you have submitted your mortgage application, lenders continue to monitor your financial situation right up to completion. Making significant financial changes during this period can jeopardise your approval.

Common mistakes during the application process:

• Changing jobs — lenders want to see stable employment. Starting a new job, particularly during a probationary period, can cause your application to be reassessed or declined
• Taking on new credit — applying for credit cards, car finance, or personal loans during the mortgage process increases your debt-to-income ratio and can lead to affordability concerns
• Making large, unexplained deposits or withdrawals — lenders scrutinise your bank statements for unusual activity. Large cash deposits, gambling transactions, or unexplained transfers can raise red flags
• Missing payments on existing commitments — even a single missed payment on a credit card or phone contract during the application process can cause problems

How to avoid it:

• Keep your finances as stable and consistent as possible from the point of application through to completion
• Avoid taking on any new credit
• Do not change jobs if you can help it — or at least discuss the timing with your broker first
• Make sure all existing direct debits and credit commitments are paid on time

Not using a mortgage broker

Perhaps the biggest mistake first-time buyers make is trying to navigate the mortgage market alone. With hundreds of mortgage products available from dozens of lenders — many of which are only accessible through brokers — going directly to your bank severely limits your options.

Why a broker makes a difference:

• Access to the whole of market — brokers can compare products from across the market, including exclusive deals not available directly from lenders
• Expert knowledge of lender criteria — different lenders have different rules about income types, credit history, property types, and more. A broker knows which lenders are most likely to approve your application
• Time savings — instead of researching and applying to multiple lenders yourself, your broker handles the process from start to finish
• Better outcomes — brokers often secure better deals than buyers find on their own, because they know where to look and how to present applications effectively
• Support through the process — buying your first home is stressful. Having an experienced professional guide you through every step provides peace of mind

At Option Finance, our advisers specialise in helping first-time buyers find the right mortgage. We take the time to understand your circumstances and find the most suitable and affordable product for your needs.

Rushing the decision

Buying your first home is a major financial commitment, and rushing into a decision — whether on the property itself or the mortgage — can lead to regret.

Common ways first-time buyers rush:

• Offering on the first property they see because they are excited
• Accepting the first mortgage offer without comparing alternatives
• Skipping the survey to save money or speed up the process
• Not reading the mortgage terms and conditions carefully

How to avoid it:

• Take your time to view multiple properties and research the area thoroughly
• Compare at least three to five mortgage products (or let your broker do this for you)
• Always get a property survey — it could reveal problems that save you thousands or give you negotiating power
• Read and understand all the terms of your mortgage, particularly around early repayment charges, overpayment allowances, and what happens at the end of your initial rate period

Use our repayment calculator to model different mortgage terms and see how the length of your mortgage affects your monthly payments and total interest paid. You can also explore how making extra payments can shorten your term with our overpayment calculator.

Get expert guidance for your first mortgage

Buying your first home does not have to be overwhelming. By avoiding the common mistakes outlined above and working with an experienced mortgage broker, you can navigate the process with confidence and secure the best possible deal.

At Option Finance, we have extensive experience helping first-time buyers across the UK. Whether you are just starting to save for a deposit, exploring government schemes, or ready to make an offer, our team is here to help at every stage. For a complete overview of the entire process, read our ultimate UK first-time buyer mortgage guide.

Apply now to speak with one of our mortgage advisers and take the first step towards owning your home.