How to Budget for a House Deposit in the UK

Photo by Viktor Forgacs on Unsplash

Saving for a house deposit is one of the largest financial goals most people set. The target is significant, the timeline is long, and the temptation to abandon the plan mid-way is real. Getting the structure right from the start makes the difference between drifting and making visible progress.

What Deposit Do You Actually Need?

The minimum deposit for a UK mortgage is typically 5% of the property price (95% LTV mortgages). But a larger deposit changes your situation in two important ways:

Lower mortgage rate: Mortgage rates improve significantly at lower LTV tiers — typically 90%, 85%, 80%, 75%, and 60%. The jump from 95% to 90% LTV (5% to 10% deposit) often saves 0.3–0.8% on your interest rate. On a £200,000 mortgage over 25 years, that’s thousands of pounds.

Wider choice of lenders: 95% LTV mortgages are available from fewer lenders and are often withdrawn entirely in uncertain markets.

Practical targets:
– 5% deposit: Minimum threshold — enables you to buy but at the highest interest rate
– 10% deposit: Often the first meaningful rate improvement threshold
– 15–20% deposit: Better rates again; avoids the highest-risk tier

For a £250,000 property:
– 5% = £12,500
– 10% = £25,000
– 20% = £50,000

Setting a Savings Target

Start with a realistic property price for your target area and calculate the deposit percentage you’re aiming for. Factor in:

• Solicitor fees: £1,000–£2,500 typically
• Survey costs: £400–£1,500 depending on type
• Stamp duty: Calculated on the purchase price (first-time buyers are exempt on the first £425,000 as of 2024/25, though this threshold is scheduled to revert in April 2025 — check current rules)
• Moving costs and initial setup: £500–£3,000+

A common mistake is saving exactly the deposit amount and forgetting the purchase costs, which can add £3,000–£10,000 to the total needed.

How Long Will It Take?

Once you have a target amount, divide by how much you can save monthly.

Example: Target £25,000 / Saving £800/month = 31 months (just over 2.5 years)

To maximise savings rate, work through this sequence:

1. Calculate your current monthly surplus (income minus essential outgoings)

2. Identify what’s reducible: Subscriptions you don’t use, eating out frequency, car expenses if a cheaper alternative exists, discretionary spending categories that are higher than they need to be

3. Set a fixed monthly saving amount — not “what’s left over,” which tends to be nothing. Automate a transfer on payday to your deposit savings account.

4. Review every 6 months: Salary changes, bills changing, subscriptions lapsing — all change your surplus. Adjust upward when possible.

Which Account to Save In

Lifetime ISA (LISA): If you’re under 40 and buying your first home, the LISA is the best option for at least part of your savings. The government adds 25% on contributions up to £4,000 per year — effectively £1,000 of free money annually. The property must cost £450,000 or less and you must have held the LISA for at least 12 months before using it. If you withdraw for any other reason, you pay a 25% penalty (which takes back the bonus and then some).

Help to Buy ISA: Closed to new applicants since 2019. If you have an existing one, you can still contribute until November 2029 and claim the bonus.

Cash ISA or easy-access savings account: For the portion of your deposit above the LISA limit (or if you don’t qualify for a LISA), a high-rate easy-access savings account or fixed-rate cash ISA is the sensible choice. Compare rates on MoneySavingExpert or Moneyfacts — challenger banks consistently offer better rates than high street banks.

Avoid investing your house deposit in stocks and shares unless your timeline is 5+ years and you’d be comfortable with the deposit value falling 20–30% in a market downturn. For most people saving for a house in the next 2–4 years, cash is right.

The LISA + Savings Account Combination

A common strategy for first-time buyers:

1. Open a LISA (Moneybox, Nutmeg, or a bank offering a LISA)
2. Contribute £4,000/year to the LISA — receive the 25% bonus (£1,000/year)
3. Save additional amounts in a high-rate easy-access savings account
4. At purchase, use both the LISA (bonus included) and the savings account together for the deposit

The LISA is particularly powerful for couples buying together — each can open one and receive the bonus, potentially adding £2,000/year combined.

Common Budgeting Mistakes When Saving for a Deposit

Not automating savings: Relying on discipline to transfer money at the end of the month means the money gets spent. Automate it.

Keeping deposit savings in a current account: Money sitting in a current account earns nothing and is easily spent. A separate, named account with a competitive interest rate creates psychological separation and earns interest.

Undershooting the target: Forgetting stamp duty, solicitor fees, and survey costs often means arriving at exchange with insufficient funds. Calculate the full cost of purchase, not just the deposit.

Not reviewing the plan: A pay rise, a reduced rent by moving, a bonus — any of these can accelerate the timeline substantially if you review and redirect the extra money.

Summary

Saving for a deposit is a medium-term goal that rewards structure and patience:

1. Work out the full cost of purchase — deposit plus stamp duty, solicitor fees, and survey costs
2. Automate a monthly transfer on payday — not “what’s left over at month end”
3. Open a LISA if you’re under 40 and buying under £450,000 — the 25% government bonus is the best return available
4. Use a competitive savings account for the remainder — compare rates on comparison sites, not your high street bank
5. Review the plan every 6 months — salary changes and reduced expenses should translate into a higher monthly saving amount

Next read: What is a Lifetime ISA and who should open one? | https://moneyunpacked.com/what-is-a-lifetime-isa-and-who-should-open-one/