Start by Working Out What You Actually Need

Before you start saving in earnest, it helps to put a number on the page. Most lenders look for a deposit of at least 5% of the purchase price, and the difference in mortgage rates between a 5% and a 10% deposit can be significant. Many first-time buyers aim for 10%, which on a £250,000 property means £25,000.

Remember that the deposit is not the only cost. You will also need to budget for a valuation fee, solicitor's fees, a survey, any stamp duty that applies, removal costs and the small fortune that furnishing a home always seems to require. Build a buffer of a few thousand pounds on top of your deposit target so that a surprise does not knock your plans sideways.

Make Regular Saving the Default, Not a Decision

The single most effective habit is to move money out of your current account on the day you are paid, rather than saving whatever happens to be left at the end of the month. Set up a standing order to a separate savings account and treat it like any other bill.

• Save a fixed amount each payday, even if it feels modest at first. £250 a month is £3,000 a year.
• Increase the amount whenever your income rises, such as after a pay review or a change of job.
• Keep the money somewhere separate from your everyday spending, ideally at a different provider, so it is slightly harder to reach.
• Review the figure every six months and nudge it up if your circumstances allow.

Automating the process removes willpower from the equation, and it is far easier to keep going for two or three years when you are not making a fresh decision every month.

Trim the Outgoings That Are Quietly Eating Your Deposit

A deposit is built from two directions: what you earn and what you spend. The second is often easier to influence than people expect. Go through your bank statements for the last three months and highlight anything that repeats.

Subscriptions you have forgotten about, a mobile contract you have not reviewed in years, insurance renewals you accepted without shopping around, and broadband deals that have crept up after the introductory period are all common culprits. Cutting £120 a month is worth £1,440 a year, which is a meaningful slice of a deposit. It also strengthens your mortgage application, because lenders assess your regular commitments when working out what you can afford.

Use Tax-Efficient Accounts to Do More of the Work

Where you hold your savings matters almost as much as how much you save. A Lifetime ISA is designed specifically for this purpose. If you are between 18 and 39, you can pay in up to £4,000 each tax year and receive a 25% government bonus on top, up to £1,000 a year. The money must be used for a first home worth £450,000 or less, and the account needs to have been open for at least twelve months before you buy.

Be aware of the rules. Withdrawing for anything other than a qualifying first home or retirement normally means losing 25% of the amount taken out, which is more than the bonus you received. If you are hoping to buy within the next twelve months, a straightforward cash ISA or a competitive easy-access account may suit you better.

• A cash ISA lets you save up to £20,000 a year with interest free of income tax.
• Outside an ISA, the personal savings allowance means basic-rate taxpayers can earn £1,000 of interest tax-free.
• Fixed-rate bonds often pay more than instant-access accounts, but only tie up money you will not need before completion.
• Premium bonds keep your capital safe and offer tax-free prizes, though returns are not guaranteed.

The old Help to Buy ISA is closed to new savers, so a Lifetime ISA is usually the first place to look if you qualify.

Bring In Extra Money and Bank the Windfalls

Overtime, a second job, freelance work or selling items you no longer use can all shorten the timeline. So can a gift or loan from family, which is common among first-time buyers. If you do receive help, tell your solicitor and lender early: they will need to see evidence of where the money came from to satisfy anti-money laundering rules.

Windfalls are easy to fritter away. A bonus, a tax rebate or an inheritance should go straight into the deposit account before it becomes part of your everyday spending.

Protect What You Have Built and Review Often

Keep your credit file in good shape while you save. Avoid taking on new credit, keep up with existing payments, and make sure you are on the electoral roll at your current address. When you apply for a mortgage, lenders will usually ask for three to six months of bank statements, so keep your accounts tidy and avoid unexplained transfers between accounts.

Finally, speak to a mortgage adviser earlier than you think you need to. Knowing what you can borrow on your current income, and how much difference another few thousand pounds of deposit would make to your rate, turns a vague ambition into a plan with a date attached. Save steadily, spend deliberately, and let the right account do some of the heavy lifting for you.