Mortgage Deposits Explained: How Much You Really Need and How to Save It

For most people, the mortgage deposit is the single biggest financial hurdle standing between them and owning a home. It's also one of the most misunderstood parts of buying — so let's break it down.

What a deposit actually is. A mortgage deposit is the chunk of the property price you pay upfront in cash, with a lender covering the rest through the mortgage itself. The size of your deposit is usually expressed as a percentage of the property's value — this is where "loan-to-value" (LTV) comes in. A 10% deposit means a 90% LTV mortgage; a 20% deposit means an 80% LTV mortgage.

The minimum you'll typically need. Most lenders ask for at least a 5-10% deposit, though the exact minimum shifts over time and by lender, so it's worth checking current requirements on gov.uk or with a broker rather than relying on a fixed figure. On a £250,000 property, a 10% deposit works out at £25,000.

Why a bigger deposit matters beyond just "owning more of the house":

• Lower LTV mortgages usually come with better interest rates, because you represent less risk to the lender.
• A bigger deposit means smaller monthly repayments, or the option of a shorter mortgage term.
• Some of the best rates on the market are only available once you cross specific LTV thresholds — commonly 90%, 85%, 75% and 60%.

How people actually save a deposit:

• A dedicated savings account or easy-access Cash ISA, with a standing order set up on payday so saving happens automatically rather than from what's left over.
• A Lifetime ISA, if you're a first-time buyer aged 18-39, where the government adds a bonus on top of what you save — one of the few genuinely "free money" options available for this specific goal.
• Help from family, sometimes formalised through a lender's family deposit or guarantor scheme rather than a simple cash gift.

Don't forget the costs around the deposit. Stamp duty (where applicable), solicitor's fees, surveys and moving costs all sit on top of your deposit, so budget for these separately rather than assuming your deposit savings need to stretch to cover everything.

A realistic starting point. If a full 20% deposit feels miles away, don't let that stop you starting. Many first-time buyers get on the ladder with 5-10% deposits and remortgage onto better rates as their equity — and their deposit-equivalent stake in the property — grows over time.

This article is for general information only and does not constitute financial or mortgage advice. Mortgage products, rates and lending criteria change frequently and vary by lender — always check current deposit requirements and get advice from an FCA-regulated mortgage adviser before making decisions.