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How much deposit do you actually need?

Most mortgage lenders want a deposit of at least 5% of the property's purchase price, with the rest covered by the mortgage. That mortgage is expressed as a loan-to-value ratio, or LTV, so a 5% deposit means a 95% LTV mortgage.

• 5% deposit — the minimum for most first-time buyer deals, but the choice of lenders is narrower and rates are usually the highest.
• 10% deposit — the point where many buyers find a much better range of products.
• 15% deposit — often unlocks more competitive rates and more generous affordability checks.
• 20% or more — typically the sweet spot, with the widest choice and the lowest rates.

Your deposit normally needs to be genuine savings, or a gift from a family member. Lenders will ask where the money came from, so keep bank statements and a short letter from anyone who gifts you money.

Why a bigger deposit pays off twice

A larger deposit works in two ways at once. First, you borrow less, so the interest you pay overall falls. Second, a lower LTV usually means a lower interest rate, which reduces your monthly payment further.

Take a £250,000 home. With a 10% deposit you'd borrow £225,000; with 20% you'd borrow £200,000. On a typical 30-year repayment mortgage, that extra £25,000 of deposit could cut your monthly payment by well over £100. Over the full term, the saving can run into tens of thousands of pounds, and you'd own more of your home from day one.

There's a practical benefit too. Lenders stress-test your finances to check you could still cope if rates rose. A smaller loan makes that test easier to pass, which means more lenders are likely to say yes — and you're the one comparing their offers rather than hoping one will accept you.

Schemes and accounts that can boost your savings

There's no shortcut around saving, but some accounts add a little extra to what you put in.

• Lifetime ISA — for UK residents aged 18 to 39, you can save up to £4,000 a year and receive a 25% government bonus, worth up to £1,000 annually. It can be used towards a first home up to £450,000. Withdraw for anything else and you'll pay a penalty.
• Help to Buy ISA — closed to new customers, but if you already hold one you can generally keep saving into it until the scheme's deadline and claim the bonus when you buy.
• Regular savers and notice accounts — often pay better rates than easy-access accounts, and the small monthly limits suit steady saving.
• Shared ownership and guarantor mortgages — useful options if your deposit is small, though each has its own rules and costs.

Check the current rules before committing, as thresholds and deadlines do change.

The costs that sit on top of your deposit

Your deposit isn't the only money you'll need on completion day. Budget for these early so a surprise doesn't eat into your savings.

• Stamp duty or its equivalent — first-time buyer relief can reduce or remove this on lower-priced homes, but the rules differ across England, Scotland, Wales and Northern Ireland. Check the current thresholds for where you're buying.
• Conveyancing fees — typically £1,000 to £2,000 including searches and disbursements.
• Survey and valuation — a few hundred pounds, and worth every penny on an older property.
• Mortgage arrangement fee — sometimes added to the loan, sometimes paid upfront.
• Removals, furniture and basic repairs — easily £1,000 or more on a first home.
• Buildings insurance — required by your lender from the day you complete.

How to build the deposit without burning out

The buyers who get there fastest usually treat saving like a fixed bill rather than whatever's left at the end of the month.

• Automate it. Set up a standing order for the day after payday, into an account you don't carry a card for.
• Work backwards from a date. If you need £30,000 in three years, that's roughly £830 a month plus interest — adjust the timeline or the target until it feels realistic.
• Attack the big three. Rent, transport and energy usually dwarf the small stuff, so review those first.
• Trim quietly. Subscriptions, phone contracts and insurance renewals are easy wins that don't hurt day to day.
• Add windfalls. Bonuses, tax refunds, overtime and money from selling unused items can all go straight into the pot.

Protecting your deposit before you apply

A healthy deposit is only part of the picture. Lenders also look at your credit file and your regular outgoings, so a little housekeeping goes a long way.

• Get on the electoral roll at your current address.
• Check your credit reports for errors and fix anything that looks wrong.
• Avoid new credit applications, overdrafts or big car finance in the months before applying.
• Keep a clear paper trail for gifted deposits.
• Get an agreement in principle before you start viewings so sellers know you're serious.

Once your offer is accepted, carry on saving if you can. There's always something — a survey finding, a moving cost, a first utility bill — that's easier to absorb with a small cushion behind you.