First-Time Buyers
15 First-Time Buyer Mortgage Mistakes to Avoid
First-time buyers can avoid expensive setbacks by checking affordability early, understanding the full cost of a mortgage, verifying deposit funds and protecting their finances until completion.
Written and reviewed by Davi Thakar, CeMAP qualified mortgage and protection adviser Updated
Buying your first home involves more than saving a deposit and finding a property you like. Small decisions about your credit record, mortgage product, legal checks and spending can create delays or costs you did not expect.
The good news is that most common mistakes can be avoided with preparation. This guide explains 15 first-time buyer mortgage mistakes, why they matter and what to do instead. For a broader introduction, read our step-by-step first-time buyer mortgage guide and what counts as a first-time buyer or our first-time buyer mortgage advice page.
1. Not checking your credit reports before applying
Lenders examine credit history as part of their decision. Incorrect addresses, missed payments, financial associations and undisclosed commitments can cause problems, even when you have saved a good deposit.
What to do instead: Review your records with Experian, Equifax and TransUnion well before applying. Dispute genuine errors, check that your addresses are consistent and pay commitments on time. Being registered on the electoral roll can help lenders verify your identity and address, but it does not guarantee a better score or approval.
A declined mortgage application does not itself automatically create a negative marker. However, hard credit searches may be recorded, so avoid unnecessary repeated applications. If you have defaults or county court judgments, explore our adverse credit mortgage guidance before choosing a lender.
2. Assuming an Agreement in Principle guarantees a mortgage
An Agreement in Principle (AIP), sometimes called a Decision in Principle, is an initial indication of potential borrowing. It is not a binding mortgage offer. A full application still involves underwriting, document checks and assessment of the property.
What to do instead: Obtain an AIP when you have a realistic buying budget, but do not treat it as final approval. Check how long it remains valid and whether the lender uses a soft or hard credit search. The validity period and search type differ between lenders.
3. Borrowing the maximum instead of setting a comfortable budget
A lender’s affordability assessment and your personal comfort level are not identical. A large mortgage can leave too little room for maintenance, family costs or future changes in income.
What to do instead: Set a monthly housing budget that includes mortgage payments, council tax, utilities, insurance, service charges where relevant and a realistic maintenance allowance. Model how payments could change after an introductory rate ends.
Use our mortgage affordability calculator and repayment calculator as starting points, not promises of lending.
4. Looking only at the lowest advertised interest rate
The mortgage with the lowest headline rate is not necessarily the cheapest or most suitable.
| Cost or feature | Why it matters |
|---|---|
| Product or arrangement fee | A lower rate with a high fee may cost more over the deal period |
| Mortgage term | A longer term may reduce monthly payments but usually increases total interest |
| Early repayment charge | Leaving a deal early can be costly |
| Overpayment allowance | Rules can affect how flexibly you repay |
| Rate after the initial deal | Payments may increase when the introductory rate ends |
What to do instead: Compare the total cost over the period you expect to keep the product, including fees, rather than focusing only on the initial rate. Check whether adding a fee to the mortgage means paying interest on it. Ask about fixed, tracker and variable products and their risks.
5. Assuming a 5% deposit guarantees acceptance
Some lenders offer mortgages up to 95% loan-to-value (LTV), but that does not mean every buyer or property qualifies. Credit history, income, affordability, property type and lender policy all matter.
| Purchase price | 5% deposit | 10% deposit |
|---|---|---|
| £180,000 | £9,000 | £18,000 |
| £250,000 | £12,500 | £25,000 |
| £300,000 | £15,000 | £30,000 |
| £400,000 | £20,000 | £40,000 |
What to do instead: Confirm which LTV options suit your circumstances before offering on a property. A lower lender valuation can also change the deposit required. Read our first-time buyer deposit guide for illustrative figures.
6. Forgetting the costs beyond the deposit
A deposit is only one part of your buying budget. Legal fees, searches, Land Registry fees, a survey, moving expenses, insurance and immediate repairs can all require cash. Leasehold properties may also involve service charges and other ongoing liabilities.
What to do instead: Request actual quotes from your conveyancer and surveyor and keep a contingency reserve appropriate to the property. Avoid relying on a single generic estimate because costs vary significantly.
7. Getting first-time buyer Stamp Duty relief wrong
In England and Northern Ireland, qualifying first-time buyers generally pay 0% Stamp Duty Land Tax (SDLT) on the first £300,000 and 5% on the portion from £300,001 to £500,000. The relief is unavailable for purchases above £500,000. Every purchaser must meet the relevant first-time buyer conditions.
For the detailed thresholds, worked examples and eligibility rules, read what counts as a first-time buyer and use our Stamp Duty calculator.
What to do instead: Tell your conveyancer about any property you have previously owned, including inherited interests and property overseas. Joint buyers should not assume relief is available when one has owned a home before. Scotland uses LBTT and Wales uses LTT, with different rules. Check HMRC’s first-time buyer relief guidance and our Stamp Duty calculator.
8. Not declaring where the deposit came from
Lenders and conveyancers need to understand the source of deposit funds. Savings, gifts, inheritance and proceeds from other assets may require different evidence. A loan from a relative is not the same as a gift.
What to do instead: Keep bank statements and supporting records. If family is helping, disclose the arrangement before applying. Lenders may require a gift letter, donor identification and evidence of the source of funds. See our gifted deposit mortgage guide.
9. Taking out new credit or changing finances during the application
New car finance, personal loans, missed payments or a significant change in income can affect affordability. A lender may ask for updated information before completion.
What to do instead: Discuss significant changes with your adviser promptly, including a new job, reduced hours, parental leave or new borrowing. Do not conceal changes or move funds between accounts to disguise their source.
10. Choosing a property before checking lender restrictions
Some lenders have different rules for new-build flats, unusual construction, short leases, high-rise buildings or properties with particular cladding or valuation concerns.
What to do instead: Tell your adviser the property type, tenure, lease details and any known issues before committing to non-refundable costs. The lender’s valuation and legal checks may identify restrictions that were not apparent at the viewing stage.
11. Confusing a lender valuation with an independent survey
A mortgage valuation helps the lender decide whether the property is suitable security. It is not a detailed condition survey for the buyer.
What to do instead: Consider an appropriate independent survey for the property’s age, condition and construction. Ask a qualified surveyor what level of inspection is suitable. An independent survey can reveal defects that affect your budget or decision to proceed.
12. Ignoring leasehold costs and legal restrictions
A leasehold flat can look affordable until service charges, planned major works, lease length and building obligations are taken into account. Shared Ownership buyers also need to understand rent on the unsold share and staircasing arrangements.
What to do instead: Ask your conveyancer to explain the lease, service charges, reserve funds, planned works and restrictions before exchange. Read our Shared Ownership guide if you are considering buying a share of a property.
13. Assuming government schemes work the same way
A Lifetime ISA, Shared Ownership, First Homes and lender-backed high-LTV mortgages have different eligibility rules. A scheme advertised online may be closed, unavailable locally or unsuitable for your circumstances.
A Lifetime ISA generally requires the account to have been open for at least 12 months for a qualifying first-home purchase, and the property price limit is £450,000. A non-qualifying withdrawal normally incurs a charge. The former Help to Buy equity loan scheme in England is closed to new applications. If you already have one, read our Help to Buy equity loan guide.
What to do instead: Check the current Lifetime ISA rules, the government’s First Homes information and our first-time buyer schemes guide before relying on any assistance. Do not assume an announced future scheme is already available.
14. Overlooking self-employed income evidence
Self-employed first-time buyers can qualify for mortgages, but lenders differ in how they assess sole traders and limited company directors. Having one year’s accounts does not automatically prevent an application, nor does it guarantee acceptance.
What to do instead: Prepare accounts, relevant SA302 tax calculations or tax computations, matching HMRC tax year overviews and bank statements where requested. Check which income figure the lender will use and whether it requires one year or a longer trading history.
Our one year’s accounts mortgage guide explains the differences in more detail.
15. Rushing exchange or failing to understand mortgage conditions
An accepted offer does not mean you should exchange contracts immediately. Your solicitor needs to complete legal checks, and you should understand the mortgage offer, survey findings, insurance needs and the risks of committing before everything is ready.
What to do instead: Review the mortgage offer and ask about fees, special conditions, early repayment charges and when the rate ends. Have your conveyancer explain the point at which the purchase becomes legally binding. The process is different in Scotland.
Real client example: leaving employment before applying
A first-time buyer left their employed role to become self-employed. They believed their payslips from the previous job could simply be carried over as proof of income for their mortgage application. In their circumstances, that was not sufficient. They had to wait until their first year’s self-employed accounts were available before proceeding with the mortgage application.
Davi’s insight: If you are planning to change from employment to self-employment while preparing to buy your first home, check the likely mortgage evidence requirements before leaving your job. Different lenders assess newly self-employed income differently, and previous payslips do not automatically replace evidence of your current earnings. Waiting for accounts can delay your purchase. This case describes a delay, not a confirmed mortgage completion.
Extra pitfalls when you are close to moving
Giving notice on your rental too early. If you rent, do not assume a proposed completion date is guaranteed. Discuss notice periods, exchange and completion with your conveyancer and landlord so that a delay does not leave you without somewhere to live.
Underestimating a property chain. A first-time buyer may be chain-free, but the seller might be waiting on another purchase. Ask the estate agent about the chain, keep your adviser updated and avoid booking non-refundable services until dates are sufficiently certain.
Allowing a mortgage offer to expire. Check the offer’s expiry date and any special conditions, especially if you are buying a new-build or the chain is delayed. Contact your adviser well before expiry to discuss whether an extension or fresh application may be needed.
Not arranging insurance and protection early enough. Buildings insurance is generally required by the lender from exchange of contracts in England and Wales, although the precise point at which responsibility passes can vary, especially for new builds and leasehold properties. Check with your conveyancer and lender. Life insurance and income protection are not automatically compulsory, but it is worth reviewing whether your household could keep up payments if you died, became seriously ill or could not work. Option Finance can help you discuss suitable protection with our protection team. Cover depends on eligibility, exclusions and policy terms.
Missing a better loan-to-value band by a small amount. If your deposit leaves you at 90.5% LTV, you may be assessed in a higher LTV product band than if you reached 90%. On a £200,000 property, a £19,000 deposit means 90.5% LTV, while £20,000 means 90%. Depending on lender products, another £1,000 could open up different options, although it does not guarantee a better deal. Do not use your entire emergency fund simply to reach a band.
Opening a Lifetime ISA too late. A Lifetime ISA normally must have been open for at least 12 months before you can use it towards a qualifying first-home purchase without a withdrawal charge. Check the official Lifetime ISA rules before relying on a bonus for a near-term purchase.
Only asking your own bank. Your existing bank can explain its mortgage products, but it will not normally compare the wider market for you. A mortgage broker can assess options across the lenders available to them. Ask whether the broker advises on the whole market or a limited panel and what fees apply.
First-time buyer checklist before applying
- Review your credit reports and correct genuine errors.
- Work out a comfortable monthly payment, not just the maximum loan.
- Confirm your deposit amount, source of funds and separate buying costs.
- Obtain an appropriate Agreement in Principle.
- Compare total mortgage costs, fees and product conditions.
- Check the property’s tenure and any lender restrictions.
- Instruct a conveyancer and consider an independent survey.
- Disclose changes in employment, income or borrowing promptly.
- Review the mortgage offer and legal documents before exchange.
- Confirm rental notice, chain position and mortgage offer expiry before arranging your move.
Frequently asked questions
What is the biggest mistake first-time buyers make?
There is no single mistake that applies to everyone. Common costly errors include borrowing beyond a comfortable budget, ignoring fees and applying before checking credit history or deposit evidence.
Does a declined mortgage application damage my credit score?
A decline itself is not automatically recorded as a negative credit event, but the lender’s hard search may appear on your file. Multiple applications can affect how some lenders assess you.
Should I get an Agreement in Principle before viewing houses?
It can help you understand a realistic price range and demonstrate that you have explored financing. It does not guarantee a full mortgage offer.
Can I get a first-time buyer mortgage with a 5% deposit?
Some lenders offer 95% LTV products, subject to affordability, credit, property and product criteria. Not every applicant or property qualifies.
Can I change jobs after receiving a mortgage offer?
A change in employment or income may affect your lender’s assessment. Tell your adviser and lender about material changes rather than assuming the offer remains unaffected.
Do first-time buyers pay Stamp Duty in 2026?
Eligible first-time buyers in England and Northern Ireland normally pay no SDLT on the first £300,000 and 5% on the portion up to £500,000. Relief is unavailable for purchases above £500,000. Other eligibility rules apply.
Is a mortgage valuation the same as a survey?
No. A lender valuation is for lending purposes. An independent survey helps you assess the property’s condition.
Can I use a gifted deposit from my parents?
Many lenders accept qualifying gifts with appropriate declarations and source-of-funds evidence. The money must be accurately disclosed as a gift or loan.
Can I buy my first home if I am self-employed?
Yes, subject to lender criteria and affordability. Lenders may request accounts, tax calculations, tax year overviews and other evidence depending on how you trade.
What happens if the lender values the property below my offer?
You may need to renegotiate, provide a larger deposit, choose another suitable product or reconsider the purchase. A different lender is not guaranteed to value it more highly.
Should I choose the mortgage with the lowest interest rate?
Not necessarily. Product fees, repayment charges, flexibility, term and total cost over the relevant period all matter.
When does buying a home become legally binding?
In England and Wales, exchange of contracts usually creates the binding commitment. Scotland follows a different legal process. Your conveyancer should explain the timing and obligations.
Speak to Option Finance before making an expensive mistake
If you are preparing to buy your first home, Option Finance can help you understand lender criteria, organise your documents and compare suitable mortgage options. We can also explain what an Agreement in Principle does and does not mean.
Speak to a mortgage adviser or explore our first-time buyer mortgage advice. You can use the enquiry form below to tell us about your plans.
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Tell us about your plans and circumstances. Your initial consultation is free.
Written and reviewed by Davi Thakar
Director & Senior Mortgage Broker
CeMAP Qualified Mortgage and Protection Adviser
Davi founded Option Finance with a vision to deliver transparent mortgage advice from a wide panel of lenders. With over 10 years in financial services, he specialises in complex cases including adverse credit, self-employed borrowers with limited trading history, and large buy-to-let portfolios. He works directly on complex cases and explains each option clearly.
Meet Davi Thakar
