Ask a room of renters what stops them buying and one word comes back: deposit. It is the largest lump sum most of us ever save, and the rules around it are rarely explained plainly. How much deposit do you need to buy a house? This guide gives the honest answer — the minimums, the sweet spots, and why every extra thousand you save quietly makes the whole mortgage cheaper.
The Minimum: 5% Deposits
Many lenders offer mortgages with a deposit of just 5% of the purchase price — £10,000 on a £200,000 home. These deals exist specifically to help first-time buyers, and schemes from time to time guarantee them. The trade-off is price: with a small deposit the lender takes more risk, so the interest rate is higher, the choice of lenders narrower, and occasionally the property type restricted (new-build flats are the common example). A 5% deposit gets you on the ladder sooner — and for many buyers, sooner beats perfect.
How Deposit Size Changes Your Mortgage
Mortgages are priced in bands based on “loan-to-value” (LTV) — how much of the price you borrow. At 95% LTV you pay the highest rates. Cross to 90%, then 85%, 75% and 60%, and the rates typically step down at each band. That is why a 10% or 15% deposit is the classic sweet spot: the saving versus 5% is meaningful, but the target is still reachable. Use the bands when you set your goal — saving to just inside the next band is worth far more than stopping just short of it. A broker can show you live examples for your numbers; the process is laid out in our first-time buyer guide.
Do Not Forget the Other Costs
The deposit is not the only cash you need. Budget separately for: legal fees, a survey, mortgage arrangement and valuation fees, moving costs, and — depending on the price and your buyer status — possibly stamp duty (first-time buyer relief reduces or removes it for many purchases; check the current thresholds for your situation). Arriving at completion with the deposit but nothing left for fees is the classic first-buyer trap.
How to Build a Deposit Faster
Automate it: a standing order to a separate savings account on payday, before spending starts. Consider accounts designed for first-time buyers — at the time of writing, the Lifetime ISA adds a 25% government bonus on up to £4,000 saved per year for eligible buyers purchasing a qualifying first home, which is the single biggest boost most savers can get; check current rules, as schemes and limits change. Then attack the gap from both sides: small regular savings compound through habits — one less subscription, one more packed lunch — while a higher income month (overtime, selling unused things) dropped straight into the account moves the date noticeably.
Gifted Deposits and Other Help
Many first-time buyers receive some deposit help from family. Lenders accept gifted deposits, but they will want a signed letter confirming it is a gift, not a loan, and they will run standard identity and source-of-funds checks on the giver. Shared ownership and similar schemes lower the deposit by letting you buy a share of the home and rent the rest — a genuine route in, with its own costs and rules to study (the market context is in our UK housing market update).
The Bottom Line
How much deposit you need to buy a house has a floor (usually 5%), a sweet spot (10–15%), and a principle: every band you cross makes borrowing cheaper for decades. Save automatically, use the schemes you qualify for, and keep the fees fund separate. Then the deposit stops being a wall and becomes a date on the calendar. More buying guides live in our real estate section.
