Buying your first home is exciting, but it can also feel confusing. A mortgage is a long-term financial commitment, and small decisions at the start can affect your monthly payments, total interest and future flexibility. This guide explains how first-time buyer mortgages work in the UK, what lenders usually check, how deposits affect your options and what costs to prepare for before you make an offer.
A first-time buyer mortgage is not a single special product. It is usually a standard residential mortgage offered to someone buying their first home. Some lenders, builders and government-backed schemes may offer products aimed at first-time buyers, but the same core principles apply: the lender wants to know whether the property is suitable security and whether you can afford the repayments now and in the future.
What is a first-time buyer mortgage?
A first-time buyer mortgage helps you borrow money to buy a property you intend to live in. You pay a deposit from your own savings or eligible support, then borrow the remaining amount from a bank, building society or specialist lender. The property is used as security for the loan. If you do not keep up with repayments, your home could be repossessed.
Most first-time buyers choose a repayment mortgage. This means each monthly payment covers interest and gradually repays part of the loan. By the end of the mortgage term, the debt should be cleared if all payments are made. Interest-only mortgages are less common for first-time residential buyers and usually require a credible repayment plan.
How much deposit do first-time buyers need?
The deposit is one of the biggest barriers for first-time buyers. Some mortgages may be available with a 5% deposit, but a 10%, 15% or 20% deposit can often increase the number of deals available and may reduce the interest rate. The relationship between your mortgage and the property value is known as loan-to-value, or LTV.
- 5% deposit: You borrow 95% of the property value. This can help you buy sooner but may come with stricter checks and higher rates.
- 10% deposit: You borrow 90%. This is a common first-time buyer position and may offer more lender choice.
- 15% to 20% deposit: You borrow less and may access stronger rates, depending on the wider mortgage market.
- 25%+ deposit: Usually gives a lower LTV and can improve pricing, although income and credit checks still matter.
Mortgage affordability checks
Lenders do not simply multiply your salary and approve the result. They assess your income, regular spending, debts, dependants, credit commitments and likely future affordability. Your bank statements may be reviewed to understand how you manage money. A lender may also test whether you could still afford the mortgage if interest rates changed.
Before applying, check your monthly budget honestly. Include rent, bills, childcare, travel, food, insurance, subscriptions, credit cards, personal loans and any regular transfers. A mortgage that looks affordable on paper can still feel uncomfortable if you leave no room for repairs, emergencies or changes in income.
Costs beyond the deposit
First-time buyers often focus on the deposit and forget the additional costs of buying a home. These can include solicitor fees, survey costs, valuation fees, mortgage arrangement fees, moving costs, buildings insurance, furniture and immediate repairs. Depending on the property price and location, stamp duty or the relevant property transaction tax may also apply.
A sensible approach is to keep a separate moving fund as well as your deposit. Using every pound of savings as a deposit can leave you exposed when the boiler breaks, the roof needs work or your first utility bills arrive.
Government schemes and support
Support for first-time buyers changes over time, so always check current eligibility before relying on a scheme. Common options may include Shared Ownership, Lifetime ISAs and local or developer-backed incentives. Some schemes help with the deposit, while others reduce the initial share of the property you buy. Each has rules, costs and long-term consequences.
For example, Shared Ownership can reduce the deposit needed because you buy a share of a property and pay rent on the remaining share. However, you must understand rent increases, service charges, staircasing rules and resale restrictions. A Lifetime ISA can help eligible savers build a deposit, but withdrawals outside the rules may trigger a penalty.
How credit history affects first-time buyers
Your credit file helps lenders understand how you manage borrowing. Missed payments, defaults, county court judgments, high credit utilisation or frequent recent applications can reduce your options. A clean credit file is not a guarantee of approval, but it can make the process easier.
Check your credit reports with the main UK credit reference agencies before applying. Correct errors, update your electoral roll registration, avoid unnecessary credit applications and reduce short-term borrowing where possible. If you have historic credit problems, speak to a qualified mortgage adviser before submitting multiple applications.
Common first-time buyer mistakes
One common mistake is viewing properties before understanding affordability. Another is relying on an online calculator without considering real monthly spending. Some buyers also underestimate leasehold costs, service charges, repair bills or the impact of rising mortgage payments when a fixed rate ends.
Another mistake is changing financial behaviour during the mortgage process. Taking out car finance, using buy now pay later heavily or opening new credit cards before completion can cause issues if the lender reassesses affordability.
Practical steps before applying
- Check your credit reports and correct any errors.
- Build a deposit and keep a separate emergency fund.
- Prepare payslips, bank statements and ID documents.
- Reduce unnecessary debts where possible.
- Get an agreement in principle before serious property hunting.
- Compare mortgage types, fees and total costs, not just headline rates.
- Use a qualified mortgage adviser if your situation is complex.
Frequently asked questions
Can I buy a house with a 5% deposit?
Some lenders offer 95% LTV mortgages, meaning a 5% deposit may be possible. Approval depends on income, credit history, property type and lender criteria.
What credit score do I need for a first-time buyer mortgage?
There is no single universal score because lenders use their own criteria. Your credit history, income, deposit, spending and property details all matter.
Should I use a mortgage broker?
A broker can be useful if you are self-employed, have variable income, have credit issues or want help comparing deals. Make sure you understand any fees.
How long does the mortgage process take?
Timescales vary. A straightforward application may move quickly, but delays can happen because of surveys, legal checks, valuation issues or document requests.
Final thoughts
A good first-time buyer plan is not just about getting accepted. It is about choosing a mortgage you can live with, understanding all costs and protecting yourself from avoidable financial stress. Take time to prepare your deposit, documents, credit file and monthly budget before applying.