Buying your first apartment in the UK involves at least 14 distinct steps spread over three to six months, and you’ll need somewhere between £3,000 and £8,000 in cash beyond your deposit just to cover the upfront costs. That figure alone tells you this isn’t a process you can walk into without a plan. Over the years I’ve watched friends and readers get tripped up by the same handful of surprises — the hidden fees, the timing gaps, the moments where a small mistake costs weeks of delay. This guide walks you through every stage from the first credit check to the day you get the keys, so you know exactly what’s coming and what to do about it. Here’s what you actually need to know.
If you’re looking at apartments specifically, there are extra layers to think about — lease lengths, service charges, and ground rent that don’t apply to a standard house. I’ve covered some of those common apartment pitfalls in more detail elsewhere, but for now the main thing is to treat the whole process as a sequence of checkpoints, not a single big event. A property lawyer can help you navigate the legal side early on, which saves a lot of headaches later.
What a Mortgage in Principle actually tells you
Most people assume a Mortgage in Principle — sometimes called a Decision in Principle or Agreement in Principle — is a green light to borrow a certain amount. It’s not. It’s a quick, soft-credit-check estimate from a lender that says “based on what you’ve told us, we’d probably lend you this much.” It takes five to fifteen minutes online, it’s free, and it’s valid for 60 to 90 days. Estate agents will take you more seriously if you have one, but the lender can still say no at the full application stage. Think of it as a rough guide, not a guarantee.
What I’d do: get an MIP from a broker rather than a single lender. A broker can compare products across the market, and the MIP from one lender might not reflect what another would offer. It’s a small step that gives you a much clearer picture of your budget before you start viewing.
Why the gap between offer and completion is the riskiest part
When your offer is accepted, the property is listed as “sold subject to contract.” That sounds final, but it’s not legally binding. Either party can walk away at any point before exchange of contracts, which can be weeks later. According to Quick Move Now data, about 30 to 40 percent of UK property sales fall through between offer and exchange. That’s a huge number. The most common reasons are survey issues, mortgage declines, gazumping, or a chain breaking above or below you.
Imagine you’re buying a £250,000 apartment with a 10 percent deposit. You’ve paid £500 for a survey, £1,500 in legal fees so far, and you’ve taken time off work for viewings. Then the survey reveals a major structural issue, the seller won’t negotiate, and you have to pull out. You’re out the survey and some legal costs, and you’re back to square one. That’s not unusual — it happens to thousands of buyers every year.
What I’d do in this situation: never spend money on a survey or legal fees until you’re confident the mortgage is likely to go through. Get your full mortgage application submitted as soon as your offer is accepted, and ask your solicitor for a fixed-fee quote so you know exactly what you’re on the hook for if the sale falls through. A real estate lawyer can also help you understand your options if things go wrong.
Where people go wrong with deposits and upfront costs
The biggest mistake I see is people thinking the deposit is the only cash they need. It’s not. You need three separate pots of money: the deposit itself, the upfront costs (solicitors, surveys, mortgage fees, removals), and enough monthly income to cover mortgage repayments and bills. Most lenders offer first-time buyers four to four and a half times their annual income. On a £35,000 salary, that’s roughly £140,000 to £157,500 of borrowing. Joint applicants can combine incomes, which opens up more options.
Underestimating the true cost of a small deposit
A 5 percent deposit — £12,500 on a £250,000 home — gets you in the door, but it comes with higher interest rates. A 95 percent loan-to-value mortgage typically costs 0.5 to 1.0 percent more in interest than a 75 percent LTV mortgage. On a £200,000 mortgage over 25 years, that’s roughly £15,000 to £25,000 of extra interest. A 10 percent deposit unlocks materially better rates, and 15 to 20 percent gets you the cheapest products. If you can stretch to a bigger deposit, the long-term savings are substantial.
Ignoring the Lifetime ISA until it’s too late
The Lifetime ISA gives you a 25 percent government bonus on up to £4,000 saved per year — that’s a free £1,000 a year toward your first home, as long as the property costs £450,000 or less. But you need to have the account open for at least 12 months before you can use the money for a purchase. If you’re planning to buy in 18 months, open the LISA now. Every month you delay is a month of free money you’re leaving on the table.
Skipping the property survey to save money
The lender’s valuation is a basic check to confirm the property is worth roughly what you’re paying. It protects the lender, not you. A Level 2 HomeBuyer Report costs £500 to £900 and identifies major issues like damp, subsidence, or roof problems. For older properties — pre-1930 especially — a Level 3 Building Survey at £800 to £2,000 is worth every penny. Skipping the survey is a false economy. I’ve seen buyers save £500 on a survey only to discover £10,000 of repairs after moving in.
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| Deposit % | Deposit on £250k home | Typical interest rate impact |
|---|---|---|
| 5% (95% LTV) | £12,500 | Highest rates; limited lenders |
| 10% (90% LTV) | £25,000 | Moderate rates; wide availability |
| 15% (85% LTV) | £37,500 | Better rates available |
| 20% (80% LTV) | £50,000 | Significantly better rates |
| 25%+ (75% LTV) | £62,500+ | Best rates on the market |
What I’d do: aim for at least a 10 percent deposit if you can manage it. The difference in monthly payments between 5 percent and 10 percent is often bigger than people expect, and it gives you more lender options. If you’re self-employed, start gathering your accounts early — lenders will want two to three years of tax returns, and that takes time to organise.
From deposit to doorstep: your step-by-step action plan
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Check your credit file and fix issues first
Mortgage lenders pull your credit file as the first underwriting check. You can get free statutory credit reports from Experian, Equifax, and TransUnion — use ClearScore for Equifax, Credit Karma for TransUnion, and MSE Credit Club for Experian. Late payments, defaults, and old disputed accounts can all hurt your score. Not being on the electoral roll has a huge impact, so register at gov.uk if you haven’t already. Allow three to six months to fix significant credit issues before applying for a mortgage. If you find errors, dispute them directly with the agency.
Save your deposit and use a Lifetime ISA
The minimum deposit accepted by most lenders is 5 percent, but 10 percent unlocks better rates. The Lifetime ISA adds a 25 percent government bonus on up to £4,000 per year — that’s a free £1,000 annually toward your first home, provided the property costs £450,000 or less. Open the account at least 12 months before you plan to buy. If you’re eligible, also look into the First Homes scheme in England, which offers 30 to 50 percent discounts on selected new builds for local first-time buyers, subject to an income cap.
Get a Mortgage in Principle and start viewing
An MIP takes 15 minutes online and is valid for 60 to 90 days. Estate agents will ask for one before letting you view seriously. Search Rightmove, Zoopla, and OnTheMarket for properties in your area, and register with local estate agents so they email you new listings. Aim to see five to ten properties before making an offer. When you do make an offer, anchor it to local sold prices from the Land Registry’s price paid data — not asking prices. Offers are usually verbal initially, then confirmed in writing.
Choose a solicitor and apply for the full mortgage
Online conveyancers cost £800 to £1,400 plus disbursements (searches, Land Registry fees, bank transfers). Local solicitors cost £1,200 to £2,000 plus disbursements. Total legal costs for a standard freehold purchase typically run £1,500 to £2,500 all-in. The full mortgage application requires three months of bank statements, three months of payslips (or two to three years of accounts if self-employed), your P60, photo ID, proof of address, and details of where your deposit came from. The lender does a hard credit search at this stage, and decisions take two to four weeks.
- 1Check your credit fileGet free reports from ClearScore, Credit Karma, and MSE Credit Club. Fix errors and register on the electoral roll. Allow 3–6 months for significant fixes.
- 2Save your deposit and open a LISAAim for at least 10% deposit. Open a Lifetime ISA at least 12 months before buying to get the 25% government bonus.
- 3Get a Mortgage in PrincipleFree, takes 15 minutes, valid for 60–90 days. Estate agents will ask for it before serious viewings.
- 4View properties and make an offerSee 5–10 properties. Anchor your offer to Land Registry sold prices, not asking prices. Offers are verbal then written.
- 5Choose a solicitor and apply for the mortgageGet a fixed-fee quote. Submit full mortgage application with bank statements, payslips, P60, and proof of deposit source.
- 6Arrange a property surveyLevel 2 HomeBuyer Report (£500–£900) for standard homes. Level 3 Building Survey (£800–£2,000) for older properties.
- 7Exchange contracts and completeExchange is legally binding. Completion is move-in day. Allow 8–12 weeks for chain-free purchases; longer for complex chains.
If you’re buying an apartment rather than a house, pay close attention to the lease length — anything under 80 years can make it hard to get a mortgage. Service charges and ground rent are ongoing costs that don’t apply to freehold houses, so factor them into your monthly budget. I’ve written a separate guide on buying high-rise apartments that covers these specifics in more depth.
Frequently asked questions about buying a UK apartment
Can I use a Lifetime ISA for a shared ownership purchase? ▾
What happens if my mortgage application is declined after the offer is accepted? ▾
How long does a lease need to be for a mortgage? ▾
Do I need a solicitor or can I do the legal work myself? ▾
What’s the difference between exchange and completion? ▾
Can I negotiate the service charge before buying? ▾
The whole process takes three to six months from offer accepted to completion, and the single most important thing you can do is start early. Check your credit file now. Open a Lifetime ISA if you haven’t already. Get a Mortgage in Principle before you start viewing. Each of those steps takes a few minutes but saves weeks of stress later. If this was useful, you might also want to read First-Time Buyer: Demystifying Mortgages for UK Apartment Purchases.
Sources and Further Reading
Essential Home Inspection Checklist for Apartment Buyers — A practical checklist to take with you when viewing apartments, covering structural, legal, and financial checks.
First-Time Buyer Step-by-Step UK 2026/27. UK Tax Drag, 2026.
First-Time Buyer Guide. Your First House, 2026.
