How Much Deposit Do You Need to Buy a House? A UK Guide

Saving for a home is exciting, but it can also feel like trying to hit a moving target. Friends say one thing, the internet says another, and every lender seems to have its own rules. So let us start with the question almost every buyer asks first: how much deposit do you need to buy a house? The honest answer is that it depends on the property, your circumstances and the lender, but there are some clear patterns that make planning much easier.

At Chatsworth Mortgage Group we talk to buyers across Portsmouth and beyond about their mortgage deposit every single day. This guide explains what a deposit is, how much most people put down, why the amount matters, where the money can come from, and what else you should budget for. It is general information only, so please do not treat it as personal advice.

What Is A Mortgage Deposit?

A mortgage deposit is the part of the purchase price that you pay yourself, with a mortgage covering the rest. It is normally shown as a percentage of the property’s price. On a £250,000 home, a 10% deposit would be £25,000, and you would borrow the remaining £225,000.

The share you borrow is called the loan-to-value, or LTV. A 10% deposit means a 90% LTV. This number matters because lenders use it to decide how risky a loan looks, and that in turn affects which mortgage deals are open to you and what they cost. A smaller deposit means a higher LTV, and a larger deposit means a lower one.

It also helps to know what a deposit is not. It is not a fee, and you do not lose it. It is your own money, going into a home you will own, and it forms the first slice of your equity, which is the part of the property that belongs to you rather than the lender.

How Much Deposit Do You Need To Buy A House In The UK?

Most lenders ask for a minimum deposit of around 5% of the property’s price, though the exact figure varies between lenders and depends on your circumstances. That 5% is a starting point rather than a target, because the more you can put down, the wider your choice of deals tends to become.

Here is an at-a-glance look at what different deposits could mean on a £250,000 home:

• 5% deposit, £12,500: usually the lowest you will find, which gets you onto the ladder sooner but with fewer deals to choose from.
• 10% deposit, £25,000: a noticeable step up that generally widens your choice of lenders.
• 15% deposit, £37,500: lenders tend to see a lower risk, so more competitive deals usually come into view.
• 20% deposit, £50,000, or more: typically opens the widest range of deals, including many of the most competitive on the market.

These are general patterns, not promises. Mortgage rates move all the time, and what is on offer depends on the lender, your income, your credit history and the property itself. A broker can show you what is actually available for your situation rather than what a headline suggests.

If you are a first-time buyer, our first time buyers mortgage advice guide walks through the wider process from start to finish.

Why A Bigger Mortgage Deposit Helps

It is tempting to see the deposit purely as the price of entry, but it influences much more than that. A bigger mortgage deposit means a lower LTV, and lenders usually reward lower LTVs with a wider choice of deals and, often, lower interest rates. A lower rate can mean smaller monthly payments and less interest paid over the full term.

You also borrow less in the first place. That means a smaller monthly payment than you would otherwise have, and it gives you a larger cushion of equity from day one. Equity can be useful when you come to remortgage or move, because a lower LTV may open up better deals again.

There is a flip side, though. Saving for longer means paying rent for longer, and house prices may move while you wait. For some people, buying sooner with a smaller deposit is the right call, and for others, waiting a little longer pays off. There is no single answer, which is exactly why it helps to talk it through with someone who can look at the numbers with you.

Where Your Deposit Can Come From

Most people build their deposit from savings, but it is not the only source. Here are the routes buyers commonly use:

• Regular savings: setting up a standing order on payday is one of the simplest ways to build a deposit steadily.
• A Lifetime ISA: at the time of writing, people aged 18 to 39 can save up to £4,000 a year into a Lifetime ISA, and the government adds a 25% bonus, worth up to £1,000 a year. It can be used towards a first home within the property price limit, and there are rules about how long the account must be open. Rules can change, so check the current terms on GOV.UK.
• A gift from family: many lenders accept a gifted deposit from a close relative, usually with a signed letter confirming it is a gift and not a loan.
• Proceeds from a sale: if you are moving, the equity in your current home often becomes your next deposit.
• Other savings and investments: money held elsewhere can count too, provided you can show where it came from.

Whichever route you take, lenders will want to see where the money came from. They usually ask for several months of bank statements, so it is sensible to keep your deposit in a clear, traceable account and avoid moving large sums around without a record. Mentioning it to your broker early saves a lot of last-minute scrambling.

Help For Buyers With A Smaller Deposit

If a big deposit feels out of reach, please do not assume you are shut out. Mortgages aimed at buyers with 5% or 10% are widely available, and some schemes are designed to make buying more accessible. What exists changes over time, so it is worth checking what is current rather than relying on something you read years ago.

One option some buyers look at is shared ownership, where you buy a share of a home and pay rent on the rest. It means you need a deposit on a smaller share, which can lower the amount you need to find up front. It does come with its own rules and costs, so our guide to shared ownership mortgages is a good place to learn how it works.

So when people ask how much deposit do you need to buy a house, the best answer is that it depends on what you can comfortably afford to borrow as well as what you can save. The most useful first step is an honest look at your income, your outgoings and your savings. That tells you what is genuinely achievable, rather than what you fear might be. Many people buy successfully with far less than they expected, provided the rest of their finances stack up.

Other Costs To Budget For Alongside Your Deposit

After asking how much deposit do you need to buy a house, many buyers forget that the deposit is the biggest upfront cost of buying a home but rarely the only one. Building the others into your plan means no nasty surprises along the way. Depending on your circumstances, you may need to allow for:

• Stamp duty: first-time buyers may qualify for relief, but the thresholds change, so check the current rules on GOV.UK.
• Legal and conveyancing fees: the cost of the solicitor or conveyancer handling the legal side of the purchase.
• Survey and valuation fees: some lenders include a basic valuation, but a fuller survey is a separate cost.
• Mortgage fees: arrangement or product fees on some deals, and a broker fee where one applies.
• Moving costs and first jobs: removals, furniture, and any work the new home needs straight away.

Once you have a rough figure, a mortgage in principle can show roughly how much a lender might be willing to offer, which helps you set a realistic price range before you start viewing homes. It is not a final offer, but it is a handy planning tool.

How Long Might It Take To Save A Deposit?

That depends entirely on the price of the home you are aiming for and how much you can set aside each month. As a simple illustration, saving £500 a month would build £6,000 in a year, and £12,500 would take a little over two years, before any interest or bonus. Add a Lifetime ISA bonus or help from family, and the timeline could shrink.

It is also worth thinking about the type of home you are targeting. A smaller property or a different area can change the deposit you need, because a percentage of a lower price is a lower sum. Many buyers find that setting a realistic target, a monthly savings amount and a review date every few months keeps them motivated and on track. If you are still wondering how much deposit you need to buy a house in your price range, a short conversation with a broker can turn a rough guess into a realistic number.

Frequently Asked Questions About Mortgage Deposits

Can I buy a house with a 5% deposit?

In many cases, yes. A 5% deposit is a common minimum, though it usually comes with fewer deals than a larger deposit. Whether it is the right move depends on your income, your credit history and the property, which a broker can look at with you.

Is a 10% deposit enough to get a good mortgage?

A 10% deposit widens your choice of lenders compared with 5%, and many buyers use it successfully. Lenders generally reserve their most competitive deals for larger deposits, so it is worth comparing what is available at your current level against what a slightly bigger deposit might offer.

Can family give me money towards my deposit?

Yes, many lenders accept a gifted deposit from a close family member. They usually ask for a letter confirming that the money is a gift with nothing to be repaid, and they may need to see proof of where it came from. Mention it to your broker early so it can be handled smoothly.

Does my deposit have to be cash in the bank?

Most deposits are held as cash, but money from a Lifetime ISA, the sale of another property or other savings and investments can often be used. Lenders will want to trace the source of the funds, so keep clear records.

Do first-time buyers need a bigger deposit than other buyers?

Not necessarily. Lenders look at the size of the deposit and your overall finances rather than whether you have owned before. Being a first-time buyer may give you access to certain schemes and stamp duty relief, so it is worth asking what applies to you.

Talk To Chatsworth Mortgage Group

Knowing how much deposit you need turns a vague worry into a clear plan. Whether you are saving your first 5% or wondering if holding out for a bigger deposit is worth it, talking it through can bring a lot of clarity.

If you would like to understand where you stand, our friendly team is happy to have a no-pressure chat about your circumstances and explain your options in plain English. You are welcome to get in touch with us here, or visit the Chatsworth Mortgage Group home page to find out more about how we help buyers across Portsmouth and beyond.