Most UK lenders will accept a minimum deposit of 5% of the property's price, though some schemes and lenders ask for 10% or 15% depending on your circumstances. The bigger point is that 5% gets you through the door, but it rarely gets you the best deal. The size of your deposit is one of the biggest single factors in what mortgage rate you're offered, so it is worth understanding properly before you start house hunting.
The minimum deposit, and why it is rarely the right target
A 5% deposit mortgage exists, and for many first-time buyers it is the only realistic way onto the property ladder right now. But lenders price mortgages in bands based on loan-to-value (LTV), which is simply the size of your mortgage compared to the property's value. A 95% LTV mortgage (5% deposit) will almost always carry a noticeably higher interest rate than a 90% or 85% LTV mortgage, because the lender is taking on more risk if house prices fall or you are unable to pay.
As an illustrative example only, moving from a 95% to a 90% mortgage can shift the interest rate down by a meaningful margin, which over a 25 or 30 year term can add up to tens of thousands of pounds in interest. These figures move constantly with the market, so treat any specific rate you see quoted anywhere, including here, as a snapshot rather than a promise.
How deposit size actually changes your mortgage
Lower rates at each LTV band
Lenders typically have pricing tiers at 95%, 90%, 85%, 80%, 75% and 60% LTV. Crossing from one band into the next usually unlocks a better rate. This means that finding an extra few thousand pounds to cross a threshold, say from 92% down to 90% LTV, can sometimes be worth it even if it means waiting a few more months to save.
Wider choice of lenders and products
At higher deposit levels, more lenders compete for your business, which generally means more product choice, including fixed, tracker and offset options. At the 95% end of the market, fewer lenders operate, so your choice narrows.
Affordability and approval odds
A bigger deposit also means you are borrowing less relative to your income, which can make affordability assessments easier to pass, particularly if your income is complex, you are self-employed, or you have existing credit commitments.
What counts as a deposit
Your deposit can come from several sources, and lenders will want to see evidence of where it has come from as part of anti-money-laundering checks. Common sources include:
- Personal savings built up over time
- A gift from family (lenders usually need a signed gift letter confirming it is not a loan)
- Proceeds from selling a previous property
- Government schemes such as a Lifetime ISA, where applicable
- Inheritance
If your deposit is a mix of sources, keep clear records and bank statements, as gaps or large unexplained transfers are one of the most common reasons mortgage applications get delayed.
Practical ways to build a bigger deposit faster
- Use a Lifetime ISA if you're eligible. For qualifying first-time buyers, the government bonus on contributions can meaningfully speed up saving, subject to the scheme's own limits and rules at the time.
- Separate your deposit savings from everyday spending. A dedicated savings account makes it easier to see progress and resist dipping in.
- Ask about family gifted deposits early. If family are willing to help, understanding the paperwork lenders need in advance avoids delays later.
- Review your outgoings six to twelve months before applying. Lenders look at recent bank statements, so tidying up spending patterns (reducing short-term debt, avoiding new credit commitments) in the run-up to your application can help both your deposit and your approval chances.
- Get a mortgage health check before you've finished saving. This does not commit you to anything, but it means you know exactly what deposit unlocks what kind of deal for your specific situation, rather than guessing.
Does the deposit size matter for remortgaging too?
Yes. If you already own a home, the same loan-to-value logic applies when you remortgage. The more equity you have built up (through repayments and, in some cases, house price growth), the lower your LTV and potentially the better the rate available to you at renewal.
Talk to someone before you assume you can't afford it
A common mistake is ruling yourself out of buying because you assume you need a large deposit saved before even having the conversation. In reality, the right deposit for you depends on your income, the properties you're looking at, and which schemes you might qualify for, including 5% deposit options. This is exactly the kind of question a mortgage adviser should answer honestly, including telling you if waiting and saving more is genuinely the better move for your situation, rather than rushing you into the smallest deposit available.
Frequently asked questions
Can I get a mortgage with less than a 5% deposit? It is uncommon. A small number of niche schemes or guarantor-backed products exist from time to time, but the vast majority of the UK mortgage market starts at 5%. Availability changes, so it is worth checking current options rather than assuming.
Is a bigger deposit always better? Usually it improves your rate and choice of lender, but not always enough to justify delaying a purchase for years, especially if rents or house prices are rising faster than you can save. It is a balance worth discussing with an adviser rather than assuming either way.
Do I need the full deposit before I apply for a mortgage? You generally need to evidence the deposit is available before completion, but you can start the mortgage application and get an Agreement in Principle before every penny is in place, as long as you are confident the funds will be there.
If you want a clear, honest picture of what deposit you actually need for your situation, and which lenders might suit you at that level, get in touch with The Mortgage Experts for a straightforward conversation before you start house hunting.