If you're 35 and you don't already have a Lifetime ISA, you have four years left to open one. You don't have to use it now. You don't have to be ready to buy. But after your 40th birthday you can't open one, ever, and the 25% government top-up disappears with it.
That's the single piece of advice I'd give a UK first-time buyer that most others won't lead with. The LISA is the only widely available scheme where the government adds £1 for every £4 you save, up to £1,000 a year. Pre-39, open one. The other 90% of first-time buying advice can wait until you're closer to actually doing it.
How big a deposit you actually need
The first job is to be honest with yourself about deposit size. The published "minimum 5%" figure is mostly theoretical for first-time buyers in 2026. The realistic spectrum:
A 5% deposit gets you a 95% loan-to-value mortgage. Rate available, but at the worst end of the lender's pricing. Mortgage Guarantee Scheme deals exist; the rate is typically 0.5-1.0% above 75% LTV deals.
A 10% deposit moves you to 90% LTV, where pricing improves meaningfully. This is the practical floor for most buyers.
A 15-20% deposit moves you into 75-85% LTV territory, where a substantial step in rate happens. On a £250,000 property, the difference between 10% and 20% deposit could be 0.5-0.8% on the mortgage rate, which is roughly £75-£120 a month.
Above 25% deposit, you're past the rate-band cliff and further deposit only saves you interest on the marginal pound, not on the whole loan. Most first-time buyers should aim for 15-20%, not 25%+.
The trade-off is time. Saving 20% on a £250,000 home means £50,000. At £500/month with the LISA bonus included, that's about eight years. Most people don't have eight years of savings runway. The real question is whether to save longer for a 20% deposit or buy sooner with 10% and accept the worse rate.
Lifetime ISA, in plain numbers
Open between 18 and 39. Save up to £4,000/year. Government adds 25% on top, paid monthly into the account. So £4,000 of your money becomes £5,000 in the LISA.
You can withdraw for a first home (under £450,000 anywhere in the UK) penalty-free. You can also withdraw at age 60, penalty-free, for retirement. Any other withdrawal incurs a 25% penalty, which is more painful than it sounds because it removes both the bonus and a slice of your own money.
Cash LISAs are at Skipton Building Society and a few others; rates change but typically pay 3-4% interest on top of the bonus. Stocks-and-shares LISAs are at Moneybox, Hargreaves Lansdown, AJ Bell, Nutmeg. Investment LISAs are appropriate if you're more than five years from buying; cash LISAs if less.
A specific tactic worth knowing: open the LISA, even if you've only got £1 to put in. The 12-month rule means you can't withdraw for a first home in the first year, so opening it well in advance unlocks earlier flexibility.
A property under £450,000
This figure trips people up. The LISA only works for first homes priced at £450,000 or under, anywhere in the UK. Same threshold for London and for the cheapest postcode in Sunderland. The threshold hasn't moved since 2017, while London prices have moved by tens of percent.
If you're buying a property over £450,000 with LISA money, you have to withdraw with the 25% penalty, which destroys most of the benefit. The strategic question for buyers in expensive areas: can you find a property under £450,000? Often yes, with smaller flats, ex-local authority, or further out in zones 4-6. If you genuinely can't, the LISA isn't your tool.
For partners both first-time buyers, both LISAs apply. Combined, that's £2,000/year of free government money plus the full £8,000/year savings rate.
What lenders actually look at
Mortgage affordability in the UK in 2026 is gated by a few things, all of which lenders will check before completing:
Income. Salaried, two recent payslips and a P60. Self-employed, two years of accounts plus an SA302. Multiple income sources are fine; lenders will weight bonuses (50-100%, depending on bank) and dividends (variable) differently. The headline multiple is typically 4-4.5x annual income, sometimes 5x for higher earners or specific lenders.
Credit history. Lenders pull files from Experian, Equifax, and TransUnion. They want to see at least 6-12 months of UK credit activity, on-time payments, no recent defaults, no high credit utilisation. If you've never had a UK credit card, get one a year before applying and use it lightly (under 30% of limit) and pay it off in full monthly.
Existing debt. Car finance, student loans, credit card balances, and overdrafts all reduce the affordability calculation. £400/month of car finance reduces your borrowable amount by roughly £30,000-£50,000.
Bank statements. Three months prior to application get scrutinised. Gambling deposits, undeclared loans, and consistent overdraft usage are all flags. Live cleanly for the three months before applying. Yes, including not making cryptocurrency punts on payday.
Deposit source. Every penny of the deposit has to be traceable. Salary into account, investments sold and transferred, cash gifts from family with a letter from the giver confirming it's a gift not a loan. "Cash savings" with no provenance will fail.
Government schemes beyond the LISA
The First Homes Scheme (England) discounts new-build homes 30-50% for first-time buyers, with local connection requirements and an income cap (typically £80,000 outside London, £90,000 in). The discount is locked in: when you sell, the next buyer also gets the discount, so you're getting a price discount but not market appreciation on the discounted portion. Worth it for buyers in areas with First Homes properties available; check your local council.
Shared Ownership lets you buy 25-75% of a property and pay rent on the rest. Lower deposit needed, lower monthly mortgage, but you pay rent and (often) service charges on the unowned portion. Staircase up over time to buy more. Shared Ownership has historically had complaints about hidden costs and selling difficulties; read the lease carefully and budget for the service charge realistically.
Help to Buy ISA (closed to new applicants since 2019) and Help to Buy Equity Loan (closed in England in March 2023) are mostly historical now. If you opened one before they closed, the bonus on the H2B ISA remains available until December 2030. If you didn't, focus on LISA.
In Wales, Scotland, and Northern Ireland, equivalent equity loan schemes still operate with different terms. Devolved housing policies differ; check your country's specifics.
A timeline that actually fits a normal life
Realistic preparation for a UK first-time buy looks like this:
Three to five years out: open the LISA, set up a direct debit, start tracking your spending honestly. Get a credit card if you don't have one, use it lightly, pay in full. Pay down any high-interest debt first; saving while paying 20%+ on credit cards is a losing trade.
One to two years out: decide on a target area and start tracking properties at the price you can afford. Use Rightmove and Zoopla; ignore agent estimates of "value" because they're sales tools. Walk the streets at different times of day. Check the council tax band, the school catchments if relevant, the flooding maps.
Six months out: get a mortgage decision in principle. This is a soft credit check; doesn't affect your score. The number it produces is realistic.
Three months out: stop taking on new credit, don't change jobs, keep your bank statements clean. Start interviewing solicitors (you'll need one; budget £700-£1,500 for conveyancing).
Offer accepted: instruct your solicitor, commission a survey (HomeBuyer Report at £400-£600 for typical purchases; full Building Survey at £700-£1,500 for older properties). Submit your full mortgage application within 1-2 weeks.
Through to completion: typically 6-12 weeks. Slower if there's a chain. Don't quit your job, don't max out a credit card, don't take that holiday on a personal loan.
Costs you'll forget about
The deposit is what people remember. The rest catches them out:
| Cost | Typical UK amount |
|---|---|
| Stamp Duty (first-time buyer relief up to £425,000) | £0-£15,000+ |
| Solicitor / conveyancing | £700-£1,500 |
| Search fees | £300-£500 |
| Mortgage broker fee | £0-£500 |
| Mortgage product fee | £0-£1,500 |
| Mortgage valuation | £200-£600 |
| Survey (HomeBuyer or Building) | £400-£1,500 |
| Removal van | £400-£1,500 |
| First-month bills (council tax, utilities) | £100-£300 |
| Furnishings (everyone underestimates this) | £1,000-£20,000+ |
For most first-time buyers, the non-deposit cost lands around £4,000-£8,000 before furniture. Add £3,000-£10,000 if you'll need to furnish from scratch.
What actually goes wrong
The mistakes I've seen friends make in the UK first-time buyer process:
Underestimating the survey. A £700 building survey on a £350,000 property feels expensive. The £25,000 of damp work it identifies in a Victorian terrace doesn't.
Buying at the top of the affordability calculation. Lenders will offer 4.5x income because they can't be more conservative legally. That doesn't mean you should take it. Interest rates rise. Boilers break. Your job changes. A 4x income mortgage with a 6-month emergency fund is dramatically more comfortable than a 4.5x mortgage with no buffer.
Ignoring leasehold. Leasehold flats with short leases (under 80 years) are mortgageable but expensive to extend (£10,000-£40,000+). Service charges on new-build flats can be £200-£500/month and rise. Read the lease and the management company's accounts before exchanging.
Trusting the estate agent. Estate agents work for the seller, not you. Anything they tell you about "competing offers" or "definitely going through" should be assumed to be sales psychology unless you have it in writing.
Buying somewhere you don't actually like. A first home you regret in three years is more expensive than waiting another year for the right place. Stamp duty plus moving costs is £10,000-£25,000 you don't get back.
When you're ready
The honest signal that you're ready to buy is when:
- Your deposit is saved, with a buffer for the surveyed-list of unexpected costs
- Your mortgage decision-in-principle says you can afford the kind of property you actually want, not just the cheapest available
- You're emotionally ready to commit to an area for at least 5 years
- You have an emergency fund separate from the deposit (3-6 months of expenses)
If any of those is missing, keep saving and renting. Buying because rent feels wasted, or because friends are buying, or because someone called you a "renter for life," is how people end up overpaying for places they outgrow in two years.
The patient first-time buyers I know who got it right took 3-5 years of preparation. The impatient ones who jumped early, mostly regret it.
This article is general consumer information about UK first-time buying, not financial advice. UK first-time buyers should consult FCA-regulated UK mortgage broker and UK conveyancing solicitor.
Affiliate disclosure: Morningfold has affiliate partnerships with UK Lifetime ISA providers and mortgage brokers. See editorial standards.