How to save for a house deposit: UK, US and Nigeria guide

A house deposit is the largest savings goal most people ever set, and it repays planning because it is unforgiving of vagueness: the target is a number, the deadline is yours, and the mortgage you eventually get is priced directly off how much you saved. The mechanics below are jurisdiction-labelled, because deposits are where money rules genuinely differ by country.

How much deposit you actually need

In the UK, MoneyHelper's guidance puts the typical minimum at 5–10% of the purchase price — on a £250,000 home, £12,500 to £25,000 — with a crucial second layer: the bigger the deposit, the lower the loan-to-value (LTV), and lower LTVs unlock cheaper mortgage rates. The deposit is not just the entry ticket; it prices every payment that follows.

In the US, conventional wisdom says 20% avoids private mortgage insurance (PMI), but loans exist well below that with PMI attached — a cost that is sometimes worth paying to stop renting sooner. In Nigeria, the deposit conversation is inseparable from title due diligence (Certificate of Occupancy, governor's consent, a real survey): a cheap plot with a dirty title is the most expensive purchase available.

Turn the target into a monthly number

Work backwards, honestly: target amount minus what you have, divided by the months until your realistic deadline. MoneyHelper's own example frames it usefully — £10,000 is £278 a month for three years, or £167 for five. The longer timeline is not failure; it is arithmetic. Two multipliers do the heavy lifting:

Automate the day after payday. A standing order into a separate savings account converts willpower into plumbing.
Put windfalls straight in. Bonuses, gifts, refunds — deposited before they can become lifestyle. Deposit goals are built disproportionately from one-time money.

Use the government boosters where they exist

The UK's Lifetime ISA (LISA) is the standout: first-time buyers under 40 can save up to £4,000 a year and the government adds a 25% bonus — free money that no savings rate can beat, with penalties for non-qualifying withdrawals that you should read before opening. The US has no direct deposit bonus, but retirement-account discipline and first-time-buyer programmes (state and local) reward research. Australia runs the First Home Super Saver scheme and various state grants; Canada has the FHSA. Check the current official scheme before relying on any number here — rules and limits change with budgets.

Where the money sits while it waits

The deposit is a dated goal, so match the vehicle to the date: money needed within a couple of years belongs in protected, accessible savings (instant-access or fixed-term within the deposit-protection limits), not in investments that can halve. For longer horizons the rate question matters more, and shopping the savings market annually is worth an hour a year. And the deposit is not the whole cost — stamp duty or transfer taxes, legal fees, surveys and moving costs add a visible percentage on top; budget the number you need at completion, not at exchange.

Sources and further reading

Links were reviewed 2026-09-25. Regulatory permissions, firm status and product terms can change; use the current official register before acting.